diff options
Diffstat (limited to 'libtomcrypt/src/pk')
59 files changed, 8367 insertions, 0 deletions
diff --git a/libtomcrypt/src/pk/asn1/der/bit/der_decode_bit_string.c b/libtomcrypt/src/pk/asn1/der/bit/der_decode_bit_string.c new file mode 100644 index 0000000..da5b989 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/bit/der_decode_bit_string.c @@ -0,0 +1,101 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_bit_string.c + ASN.1 DER, encode a BIT STRING, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Store a BIT STRING + @param in The DER encoded BIT STRING + @param inlen The size of the DER BIT STRING + @param out [out] The array of bits stored (one per char) + @param outlen [in/out] The number of bits stored + @return CRYPT_OK if successful +*/ +int der_decode_bit_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long dlen, blen, x, y; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* packet must be at least 4 bytes */ + if (inlen < 4) { + return CRYPT_INVALID_ARG; + } + + /* check for 0x03 */ + if ((in[0]&0x1F) != 0x03) { + return CRYPT_INVALID_PACKET; + } + + /* offset in the data */ + x = 1; + + /* get the length of the data */ + if (in[x] & 0x80) { + /* long format get number of length bytes */ + y = in[x++] & 127; + + /* invalid if 0 or > 2 */ + if (y == 0 || y > 2) { + return CRYPT_INVALID_PACKET; + } + + /* read the data len */ + dlen = 0; + while (y--) { + dlen = (dlen << 8) | (unsigned long)in[x++]; + } + } else { + /* short format */ + dlen = in[x++] & 127; + } + + /* is the data len too long or too short? */ + if ((dlen == 0) || (dlen + x > inlen)) { + return CRYPT_INVALID_PACKET; + } + + /* get padding count */ + blen = ((dlen - 1) << 3) - (in[x++] & 7); + + /* too many bits? */ + if (blen > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* decode/store the bits */ + for (y = 0; y < blen; y++) { + out[y] = (in[x] & (1 << (7 - (y & 7)))) ? 1 : 0; + if ((y & 7) == 7) { + ++x; + } + } + + /* we done */ + *outlen = blen; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/bit/der_decode_bit_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/bit/der_encode_bit_string.c b/libtomcrypt/src/pk/asn1/der/bit/der_encode_bit_string.c new file mode 100644 index 0000000..569c15b --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/bit/der_encode_bit_string.c @@ -0,0 +1,87 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_bit_string.c + ASN.1 DER, encode a BIT STRING, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Store a BIT STRING + @param in The array of bits to store (one per char) + @param inlen The number of bits tostore + @param out [out] The destination for the DER encoded BIT STRING + @param outlen [in/out] The max size and resulting size of the DER BIT STRING + @return CRYPT_OK if successful +*/ +int der_encode_bit_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long len, x, y, buf; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* avoid overflows */ + if ((err = der_length_bit_string(inlen, &len)) != CRYPT_OK) { + return err; + } + + if (len > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* store header (include bit padding count in length) */ + x = 0; + y = (inlen >> 3) + ((inlen&7) ? 1 : 0) + 1; + + out[x++] = 0x03; + if (y < 128) { + out[x++] = y; + } else if (y < 256) { + out[x++] = 0x81; + out[x++] = y; + } else if (y < 65536) { + out[x++] = 0x82; + out[x++] = (y>>8)&255; + out[x++] = y&255; + } + + /* store number of zero padding bits */ + out[x++] = (8 - inlen) & 7; + + /* store the bits in big endian format */ + for (y = buf = 0; y < inlen; y++) { + buf |= (in[y] ? 1 : 0) << (7 - (y & 7)); + if ((y & 7) == 7) { + out[x++] = buf; + buf = 0; + } + } + /* store last byte */ + if (inlen & 7) { + out[x++] = buf; + } + *outlen = x; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/bit/der_encode_bit_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c b/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c new file mode 100644 index 0000000..dd6ea6d --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c @@ -0,0 +1,54 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_bit_string.c + ASN.1 DER, get length of BIT STRING, Tom St Denis +*/ + +#ifdef LTC_DER +/** + Gets length of DER encoding of BIT STRING + @param nbits The number of bits in the string to encode + @param outlen [out] The length of the DER encoding for the given string + @return CRYPT_OK if successful +*/ +int der_length_bit_string(unsigned long nbits, unsigned long *outlen) +{ + unsigned long nbytes; + LTC_ARGCHK(outlen != NULL); + + /* get the number of the bytes */ + nbytes = (nbits >> 3) + ((nbits & 7) ? 1 : 0) + 1; + + if (nbytes < 128) { + /* 03 LL PP DD DD DD ... */ + *outlen = 2 + nbytes; + } else if (nbytes < 256) { + /* 03 81 LL PP DD DD DD ... */ + *outlen = 3 + nbytes; + } else if (nbytes < 65536) { + /* 03 82 LL LL PP DD DD DD ... */ + *outlen = 4 + nbytes; + } else { + return CRYPT_INVALID_ARG; + } + + return CRYPT_OK; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/bit/der_length_bit_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c b/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c new file mode 100644 index 0000000..61cba11 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c @@ -0,0 +1,168 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_choice.c + ASN.1 DER, decode a CHOICE, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Decode a CHOICE + @param in The DER encoded input + @param inlen [in/out] The size of the input and resulting size of read type + @param list The list of items to decode + @param outlen The number of items in the list + @return CRYPT_OK on success +*/ +int der_decode_choice(const unsigned char *in, unsigned long *inlen, + ltc_asn1_list *list, unsigned long outlen) +{ + unsigned long size, x, z; + void *data; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(inlen != NULL); + LTC_ARGCHK(list != NULL); + + /* get blk size */ + if (*inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* set all of the "used" flags to zero */ + for (x = 0; x < outlen; x++) { + list[x].used = 0; + } + + /* now scan until we have a winner */ + for (x = 0; x < outlen; x++) { + size = list[x].size; + data = list[x].data; + + switch (list[x].type) { + case LTC_ASN1_INTEGER: + if (der_decode_integer(in, *inlen, data) == CRYPT_OK) { + if (der_length_integer(data, &z) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_SHORT_INTEGER: + if (der_decode_short_integer(in, *inlen, data) == CRYPT_OK) { + if (der_length_short_integer(size, &z) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_BIT_STRING: + if (der_decode_bit_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_bit_string(size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_OCTET_STRING: + if (der_decode_octet_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_octet_string(size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_NULL: + if (*inlen == 2 && in[x] == 0x05 && in[x+1] == 0x00) { + *inlen = 2; + return CRYPT_OK; + } + break; + + case LTC_ASN1_OBJECT_IDENTIFIER: + if (der_decode_object_identifier(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_object_identifier(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_IA5_STRING: + if (der_decode_ia5_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_ia5_string(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + + case LTC_ASN1_PRINTABLE_STRING: + if (der_decode_printable_string(in, *inlen, data, &size) == CRYPT_OK) { + if (der_length_printable_string(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + list[x].size = size; + *inlen = z; + return CRYPT_OK; + } + } + break; + + case LTC_ASN1_UTCTIME: + z = *inlen; + if (der_decode_utctime(in, &z, data) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + break; + + case LTC_ASN1_SEQUENCE: + if (der_decode_sequence(in, *inlen, data, size) == CRYPT_OK) { + if (der_length_sequence(data, size, &z) == CRYPT_OK) { + list[x].used = 1; + *inlen = z; + return CRYPT_OK; + } + } + break; + + default: + return CRYPT_INVALID_ARG; + } + } + + return CRYPT_INVALID_PACKET; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/choice/der_decode_choice.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/06/19 11:25:01 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/ia5/der_decode_ia5_string.c b/libtomcrypt/src/pk/asn1/der/ia5/der_decode_ia5_string.c new file mode 100644 index 0000000..ac0a4af --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/ia5/der_decode_ia5_string.c @@ -0,0 +1,95 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_ia5_string.c + ASN.1 DER, encode a IA5 STRING, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Store a IA5 STRING + @param in The DER encoded IA5 STRING + @param inlen The size of the DER IA5 STRING + @param out [out] The array of octets stored (one per char) + @param outlen [in/out] The number of octets stored + @return CRYPT_OK if successful +*/ +int der_decode_ia5_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x, y, len; + int t; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* must have header at least */ + if (inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* check for 0x16 */ + if ((in[0] & 0x1F) != 0x16) { + return CRYPT_INVALID_PACKET; + } + x = 1; + + /* decode the length */ + if (in[x] & 0x80) { + /* valid # of bytes in length are 1,2,3 */ + y = in[x] & 0x7F; + if ((y == 0) || (y > 3) || ((x + y) > inlen)) { + return CRYPT_INVALID_PACKET; + } + + /* read the length in */ + len = 0; + ++x; + while (y--) { + len = (len << 8) | in[x++]; + } + } else { + len = in[x++] & 0x7F; + } + + /* is it too long? */ + if (len > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + if (len + x > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* read the data */ + for (y = 0; y < len; y++) { + t = der_ia5_value_decode(in[x++]); + if (t == -1) { + return CRYPT_INVALID_ARG; + } + out[y] = t; + } + + *outlen = y; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_decode_ia5_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/ia5/der_encode_ia5_string.c b/libtomcrypt/src/pk/asn1/der/ia5/der_encode_ia5_string.c new file mode 100644 index 0000000..a79b46e --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/ia5/der_encode_ia5_string.c @@ -0,0 +1,84 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_ia5_string.c + ASN.1 DER, encode a IA5 STRING, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Store an IA5 STRING + @param in The array of IA5 to store (one per char) + @param inlen The number of IA5 to store + @param out [out] The destination for the DER encoded IA5 STRING + @param outlen [in/out] The max size and resulting size of the DER IA5 STRING + @return CRYPT_OK if successful +*/ +int der_encode_ia5_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x, y, len; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* get the size */ + if ((err = der_length_ia5_string(in, inlen, &len)) != CRYPT_OK) { + return err; + } + + /* too big? */ + if (len > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* encode the header+len */ + x = 0; + out[x++] = 0x16; + if (inlen < 128) { + out[x++] = inlen; + } else if (inlen < 256) { + out[x++] = 0x81; + out[x++] = inlen; + } else if (inlen < 65536UL) { + out[x++] = 0x82; + out[x++] = (inlen>>8)&255; + out[x++] = inlen&255; + } else if (inlen < 16777216UL) { + out[x++] = 0x83; + out[x++] = (inlen>>16)&255; + out[x++] = (inlen>>8)&255; + out[x++] = inlen&255; + } else { + return CRYPT_INVALID_ARG; + } + + /* store octets */ + for (y = 0; y < inlen; y++) { + out[x++] = der_ia5_char_encode(in[y]); + } + + /* retun length */ + *outlen = x; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_encode_ia5_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/ia5/der_length_ia5_string.c b/libtomcrypt/src/pk/asn1/der/ia5/der_length_ia5_string.c new file mode 100644 index 0000000..d07d630 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/ia5/der_length_ia5_string.c @@ -0,0 +1,194 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_ia5_string.c + ASN.1 DER, get length of IA5 STRING, Tom St Denis +*/ + +#ifdef LTC_DER + +static const struct { + int code, value; +} ia5_table[] = { +{ '\0', 0 }, +{ '\a', 7 }, +{ '\b', 8 }, +{ '\t', 9 }, +{ '\n', 10 }, +{ '\f', 12 }, +{ '\r', 13 }, +{ ' ', 32 }, +{ '!', 33 }, +{ '"', 34 }, +{ '#', 35 }, +{ '$', 36 }, +{ '%', 37 }, +{ '&', 38 }, +{ '\'', 39 }, +{ '(', 40 }, +{ ')', 41 }, +{ '*', 42 }, +{ '+', 43 }, +{ ',', 44 }, +{ '-', 45 }, +{ '.', 46 }, +{ '/', 47 }, +{ '0', 48 }, +{ '1', 49 }, +{ '2', 50 }, +{ '3', 51 }, +{ '4', 52 }, +{ '5', 53 }, +{ '6', 54 }, +{ '7', 55 }, +{ '8', 56 }, +{ '9', 57 }, +{ ':', 58 }, +{ ';', 59 }, +{ '<', 60 }, +{ '=', 61 }, +{ '>', 62 }, +{ '?', 63 }, +{ '@', 64 }, +{ 'A', 65 }, +{ 'B', 66 }, +{ 'C', 67 }, +{ 'D', 68 }, +{ 'E', 69 }, +{ 'F', 70 }, +{ 'G', 71 }, +{ 'H', 72 }, +{ 'I', 73 }, +{ 'J', 74 }, +{ 'K', 75 }, +{ 'L', 76 }, +{ 'M', 77 }, +{ 'N', 78 }, +{ 'O', 79 }, +{ 'P', 80 }, +{ 'Q', 81 }, +{ 'R', 82 }, +{ 'S', 83 }, +{ 'T', 84 }, +{ 'U', 85 }, +{ 'V', 86 }, +{ 'W', 87 }, +{ 'X', 88 }, +{ 'Y', 89 }, +{ 'Z', 90 }, +{ '[', 91 }, +{ '\\', 92 }, +{ ']', 93 }, +{ '^', 94 }, +{ '_', 95 }, +{ '`', 96 }, +{ 'a', 97 }, +{ 'b', 98 }, +{ 'c', 99 }, +{ 'd', 100 }, +{ 'e', 101 }, +{ 'f', 102 }, +{ 'g', 103 }, +{ 'h', 104 }, +{ 'i', 105 }, +{ 'j', 106 }, +{ 'k', 107 }, +{ 'l', 108 }, +{ 'm', 109 }, +{ 'n', 110 }, +{ 'o', 111 }, +{ 'p', 112 }, +{ 'q', 113 }, +{ 'r', 114 }, +{ 's', 115 }, +{ 't', 116 }, +{ 'u', 117 }, +{ 'v', 118 }, +{ 'w', 119 }, +{ 'x', 120 }, +{ 'y', 121 }, +{ 'z', 122 }, +{ '{', 123 }, +{ '|', 124 }, +{ '}', 125 }, +{ '~', 126 } +}; + +int der_ia5_char_encode(int c) +{ + int x; + for (x = 0; x < (int)(sizeof(ia5_table)/sizeof(ia5_table[0])); x++) { + if (ia5_table[x].code == c) { + return ia5_table[x].value; + } + } + return -1; +} + +int der_ia5_value_decode(int v) +{ + int x; + for (x = 0; x < (int)(sizeof(ia5_table)/sizeof(ia5_table[0])); x++) { + if (ia5_table[x].value == v) { + return ia5_table[x].code; + } + } + return -1; +} + +/** + Gets length of DER encoding of IA5 STRING + @param octets The values you want to encode + @param noctets The number of octets in the string to encode + @param outlen [out] The length of the DER encoding for the given string + @return CRYPT_OK if successful +*/ +int der_length_ia5_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen) +{ + unsigned long x; + + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(octets != NULL); + + /* scan string for validity */ + for (x = 0; x < noctets; x++) { + if (der_ia5_char_encode(octets[x]) == -1) { + return CRYPT_INVALID_ARG; + } + } + + if (noctets < 128) { + /* 16 LL DD DD DD ... */ + *outlen = 2 + noctets; + } else if (noctets < 256) { + /* 16 81 LL DD DD DD ... */ + *outlen = 3 + noctets; + } else if (noctets < 65536UL) { + /* 16 82 LL LL DD DD DD ... */ + *outlen = 4 + noctets; + } else if (noctets < 16777216UL) { + /* 16 83 LL LL LL DD DD DD ... */ + *outlen = 5 + noctets; + } else { + return CRYPT_INVALID_ARG; + } + + return CRYPT_OK; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/ia5/der_length_ia5_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c b/libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c new file mode 100644 index 0000000..e68b2c9 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c @@ -0,0 +1,110 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_integer.c + ASN.1 DER, decode an integer, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Read a mp_int integer + @param in The DER encoded data + @param inlen Size of DER encoded data + @param num The first mp_int to decode + @return CRYPT_OK if successful +*/ +int der_decode_integer(const unsigned char *in, unsigned long inlen, mp_int *num) +{ + unsigned long x, y, z; + int err; + + LTC_ARGCHK(num != NULL); + LTC_ARGCHK(in != NULL); + + /* min DER INTEGER is 0x02 01 00 == 0 */ + if (inlen < (1 + 1 + 1)) { + return CRYPT_INVALID_PACKET; + } + + /* ok expect 0x02 when we AND with 0001 1111 [1F] */ + x = 0; + if ((in[x++] & 0x1F) != 0x02) { + return CRYPT_INVALID_PACKET; + } + + /* now decode the len stuff */ + z = in[x++]; + + if ((z & 0x80) == 0x00) { + /* short form */ + + /* will it overflow? */ + if (x + z > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* no so read it */ + if ((err = mpi_to_ltc_error(mp_read_unsigned_bin(num, (unsigned char *)in + x, z))) != CRYPT_OK) { + return err; + } + } else { + /* long form */ + z &= 0x7F; + + /* will number of length bytes overflow? (or > 4) */ + if (((x + z) > inlen) || (z > 4) || (z == 0)) { + return CRYPT_INVALID_PACKET; + } + + /* now read it in */ + y = 0; + while (z--) { + y = ((unsigned long)(in[x++])) | (y << 8); + } + + /* now will reading y bytes overrun? */ + if ((x + y) > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* no so read it */ + if ((err = mpi_to_ltc_error(mp_read_unsigned_bin(num, (unsigned char *)in + x, y))) != CRYPT_OK) { + return err; + } + } + + /* see if it's negative */ + if (in[x] & 0x80) { + mp_int tmp; + if (mp_init(&tmp) != MP_OKAY) { + return CRYPT_MEM; + } + + if (mp_2expt(&tmp, mp_count_bits(num)) != MP_OKAY || mp_sub(num, &tmp, num) != MP_OKAY) { + mp_clear(&tmp); + return CRYPT_MEM; + } + mp_clear(&tmp); + } + + return CRYPT_OK; + +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_decode_integer.c,v $ */ +/* $Revision: 1.2 $ */ +/* $Date: 2005/06/01 00:06:05 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/integer/der_encode_integer.c b/libtomcrypt/src/pk/asn1/der/integer/der_encode_integer.c new file mode 100644 index 0000000..f0f41be --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/integer/der_encode_integer.c @@ -0,0 +1,128 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_integer.c + ASN.1 DER, encode an integer, Tom St Denis +*/ + + +#ifdef LTC_DER + +/* Exports a positive bignum as DER format (upto 2^32 bytes in size) */ +/** + Store a mp_int integer + @param num The first mp_int to encode + @param out [out] The destination for the DER encoded integers + @param outlen [in/out] The max size and resulting size of the DER encoded integers + @return CRYPT_OK if successful +*/ +int der_encode_integer(mp_int *num, unsigned char *out, unsigned long *outlen) +{ + unsigned long tmplen, y; + int err, leading_zero; + + LTC_ARGCHK(num != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* find out how big this will be */ + if ((err = der_length_integer(num, &tmplen)) != CRYPT_OK) { + return err; + } + + if (*outlen < tmplen) { + return CRYPT_BUFFER_OVERFLOW; + } + + if (mp_cmp_d(num, 0) != MP_LT) { + /* we only need a leading zero if the msb of the first byte is one */ + if ((mp_count_bits(num) & 7) == 0 || mp_iszero(num) == MP_YES) { + leading_zero = 1; + } else { + leading_zero = 0; + } + + /* get length of num in bytes (plus 1 since we force the msbyte to zero) */ + y = mp_unsigned_bin_size(num) + leading_zero; + } else { + leading_zero = 0; + y = mp_count_bits(num); + y = y + (8 - (y & 7)); + y = y >> 3; + + } + + /* now store initial data */ + *out++ = 0x02; + if (y < 128) { + /* short form */ + *out++ = (unsigned char)y; + } else if (y < 256) { + *out++ = 0x81; + *out++ = y; + } else if (y < 65536UL) { + *out++ = 0x82; + *out++ = (y>>8)&255; + *out++ = y; + } else if (y < 16777216UL) { + *out++ = 0x83; + *out++ = (y>>16)&255; + *out++ = (y>>8)&255; + *out++ = y; + } else { + return CRYPT_INVALID_ARG; + } + + /* now store msbyte of zero if num is non-zero */ + if (leading_zero) { + *out++ = 0x00; + } + + /* if it's not zero store it as big endian */ + if (mp_cmp_d(num, 0) == MP_GT) { + /* now store the mpint */ + if ((err = mp_to_unsigned_bin(num, out)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + } else if (mp_iszero(num) != MP_YES) { + mp_int tmp; + /* negative */ + if (mp_init(&tmp) != MP_OKAY) { + return CRYPT_MEM; + } + + /* 2^roundup and subtract */ + y = mp_count_bits(num); + y = y + (8 - (y & 7)); + if (mp_2expt(&tmp, y) != MP_OKAY || mp_add(&tmp, num, &tmp) != MP_OKAY) { + mp_clear(&tmp); + return CRYPT_MEM; + } + + if ((err = mp_to_unsigned_bin(&tmp, out)) != MP_OKAY) { + mp_clear(&tmp); + return mpi_to_ltc_error(err); + } + mp_clear(&tmp); + } + + /* we good */ + *outlen = tmplen; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_encode_integer.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/integer/der_length_integer.c b/libtomcrypt/src/pk/asn1/der/integer/der_length_integer.c new file mode 100644 index 0000000..1bfee45 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/integer/der_length_integer.c @@ -0,0 +1,81 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_integer.c + ASN.1 DER, get length of encoding, Tom St Denis +*/ + + +#ifdef LTC_DER +/** + Gets length of DER encoding of num + @param num The mp_int to get the size of + @param outlen [out] The length of the DER encoding for the given integer + @return CRYPT_OK if successful +*/ +int der_length_integer(mp_int *num, unsigned long *outlen) +{ + unsigned long z, len; + int leading_zero; + + LTC_ARGCHK(num != NULL); + LTC_ARGCHK(outlen != NULL); + + if (mp_cmp_d(num, 0) != MP_LT) { + /* positive */ + + /* we only need a leading zero if the msb of the first byte is one */ + if ((mp_count_bits(num) & 7) == 0 || mp_iszero(num) == MP_YES) { + leading_zero = 1; + } else { + leading_zero = 0; + } + + /* size for bignum */ + z = len = leading_zero + mp_unsigned_bin_size(num); + } else { + /* it's negative */ + /* find power of 2 that is a multiple of eight and greater than count bits */ + leading_zero = 0; + z = mp_count_bits(num); + z = z + (8 - (z & 7)); + len = z = z >> 3; + } + + /* now we need a length */ + if (z < 128) { + /* short form */ + ++len; + } else { + /* long form (relies on z != 0), assumes length bytes < 128 */ + ++len; + + while (z) { + ++len; + z >>= 8; + } + } + + /* we need a 0x02 to indicate it's INTEGER */ + ++len; + + /* return length */ + *outlen = len; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/integer/der_length_integer.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c b/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c new file mode 100644 index 0000000..c69c9a3 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c @@ -0,0 +1,99 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_object_identifier.c + ASN.1 DER, Decode Object Identifier, Tom St Denis +*/ + +#ifdef LTC_DER +/** + Decode OID data and store the array of integers in words + @param in The OID DER encoded data + @param inlen The length of the OID data + @param words [out] The destination of the OID words + @param outlen [in/out] The number of OID words + @return CRYPT_OK if successful +*/ +int der_decode_object_identifier(const unsigned char *in, unsigned long inlen, + unsigned long *words, unsigned long *outlen) +{ + unsigned long x, y, t, len; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(words != NULL); + LTC_ARGCHK(outlen != NULL); + + /* header is at least 3 bytes */ + if (inlen < 3) { + return CRYPT_INVALID_PACKET; + } + + /* must be room for at least two words */ + if (*outlen < 2) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* decode the packet header */ + x = 0; + if ((in[x++] & 0x1F) != 0x06) { + return CRYPT_INVALID_PACKET; + } + + /* get the length */ + if (in[x] < 128) { + len = in[x++]; + } else { + if (in[x] < 0x81 || in[x] > 0x82) { + return CRYPT_INVALID_PACKET; + } + y = in[x++] & 0x7F; + len = 0; + while (y--) { + len = (len << 8) | (unsigned long)in[x++]; + } + } + + if (len < 1 || (len + x) > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* decode word1 and word2 */ + --len; + t = in[x++]; + words[0] = t/40; + words[1] = t%40; + + /* decode rest */ + y = 2; + t = 0; + while (len--) { + t = (t << 7) | (in[x] & 0x7F); + if (!(in[x++] & 0x80)) { + /* store t */ + if (y >= *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + words[y++] = t; + t = 0; + } + } + + *outlen = y; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_decode_object_identifier.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c b/libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c new file mode 100644 index 0000000..16eb112 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c @@ -0,0 +1,103 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_object_identifier.c + ASN.1 DER, Encode Object Identifier, Tom St Denis +*/ + +#ifdef LTC_DER +/** + Encode an OID + @param words The words to encode (upto 32-bits each) + @param nwords The number of words in the OID + @param out [out] Destination of OID data + @param outlen [in/out] The max and resulting size of the OID + @return CRYPT_OK if successful +*/ +int der_encode_object_identifier(unsigned long *words, unsigned long nwords, + unsigned char *out, unsigned long *outlen) +{ + unsigned long i, x, y, z, t, mask; + int err; + + LTC_ARGCHK(words != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* check length */ + if ((err = der_length_object_identifier(words, nwords, &x)) != CRYPT_OK) { + return err; + } + if (x > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* compute length to store OID data */ + z = 1; + for (y = 2; y < nwords; y++) { + t = der_object_identifier_bits(words[y]); + z += t/7 + ((t%7) ? 1 : 0); + } + + /* store header + length */ + x = 0; + out[x++] = 0x06; + if (z < 128) { + out[x++] = z; + } else if (z < 256) { + out[x++] = 0x81; + out[x++] = z; + } else if (z < 65536UL) { + out[x++] = 0x82; + out[x++] = (z>>8)&255; + out[x++] = z&255; + } else { + return CRYPT_INVALID_ARG; + } + + /* store first byte */ + out[x++] = words[0] * 40 + words[1]; + + for (i = 2; i < nwords; i++) { + /* store 7 bit words in little endian */ + t = words[i] & 0xFFFFFFFF; + if (t) { + y = x; + mask = 0; + while (t) { + out[x++] = (t & 0x7F) | mask; + t >>= 7; + mask |= 0x80; /* upper bit is set on all but the last byte */ + } + /* now swap bytes y...x-1 */ + z = x - 1; + while (y < z) { + t = out[y]; out[y] = out[z]; out[z] = t; + ++y; + --z; + } + } else { + /* zero word */ + out[x++] = 0x00; + } + } + + *outlen = x; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_encode_object_identifier.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c b/libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c new file mode 100644 index 0000000..d03d1a7 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c @@ -0,0 +1,84 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_object_identifier.c + ASN.1 DER, get length of Object Identifier, Tom St Denis +*/ + +#ifdef LTC_DER + +unsigned long der_object_identifier_bits(unsigned long x) +{ + unsigned long c; + x &= 0xFFFFFFFF; + c = 0; + while (x) { + ++c; + x >>= 1; + } + return c; +} + + +/** + Gets length of DER encoding of Object Identifier + @param nwords The number of OID words + @param words The actual OID words to get the size of + @param outlen [out] The length of the DER encoding for the given string + @return CRYPT_OK if successful +*/ +int der_length_object_identifier(unsigned long *words, unsigned long nwords, unsigned long *outlen) +{ + unsigned long y, z, t; + + LTC_ARGCHK(words != NULL); + LTC_ARGCHK(outlen != NULL); + + + /* must be >= 2 words */ + if (nwords < 2) { + return CRYPT_INVALID_ARG; + } + + /* word1 = 0,1,2 and word2 0..39 */ + if (words[0] > 2 || words[1] > 39) { + return CRYPT_INVALID_ARG; + } + + /* leading byte of first two words */ + z = 1; + for (y = 2; y < nwords; y++) { + t = der_object_identifier_bits(words[y]); + z += t/7 + ((t%7) ? 1 : 0); + } + + /* now depending on the length our length encoding changes */ + if (z < 128) { + z += 2; + } else if (z < 256) { + z += 3; + } else if (z < 65536UL) { + z += 4; + } else { + return CRYPT_INVALID_ARG; + } + + *outlen = z; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/object_identifier/der_length_object_identifier.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/octet/der_decode_octet_string.c b/libtomcrypt/src/pk/asn1/der/octet/der_decode_octet_string.c new file mode 100644 index 0000000..2d3800f --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/octet/der_decode_octet_string.c @@ -0,0 +1,90 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_octet_string.c + ASN.1 DER, encode a OCTET STRING, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Store a OCTET STRING + @param in The DER encoded OCTET STRING + @param inlen The size of the DER OCTET STRING + @param out [out] The array of octets stored (one per char) + @param outlen [in/out] The number of octets stored + @return CRYPT_OK if successful +*/ +int der_decode_octet_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x, y, len; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* must have header at least */ + if (inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* check for 0x04 */ + if ((in[0] & 0x1F) != 0x04) { + return CRYPT_INVALID_PACKET; + } + x = 1; + + /* decode the length */ + if (in[x] & 0x80) { + /* valid # of bytes in length are 1,2,3 */ + y = in[x] & 0x7F; + if ((y == 0) || (y > 3) || ((x + y) > inlen)) { + return CRYPT_INVALID_PACKET; + } + + /* read the length in */ + len = 0; + ++x; + while (y--) { + len = (len << 8) | in[x++]; + } + } else { + len = in[x++] & 0x7F; + } + + /* is it too long? */ + if (len > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + if (len + x > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* read the data */ + for (y = 0; y < len; y++) { + out[y] = in[x++]; + } + + *outlen = y; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_decode_octet_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c b/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c new file mode 100644 index 0000000..f34b708 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c @@ -0,0 +1,85 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_octet_string.c + ASN.1 DER, encode a OCTET STRING, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Store an OCTET STRING + @param in The array of OCTETS to store (one per char) + @param inlen The number of OCTETS to store + @param out [out] The destination for the DER encoded OCTET STRING + @param outlen [in/out] The max size and resulting size of the DER OCTET STRING + @return CRYPT_OK if successful +*/ +int der_encode_octet_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x, y, len; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* get the size */ + if ((err = der_length_octet_string(inlen, &len)) != CRYPT_OK) { + return err; + } + + /* too big? */ + if (len > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* encode the header+len */ + x = 0; + out[x++] = 0x04; + if (inlen < 128) { + out[x++] = inlen; + } else if (inlen < 256) { + out[x++] = 0x81; + out[x++] = inlen; + } else if (inlen < 65536UL) { + out[x++] = 0x82; + out[x++] = (inlen>>8)&255; + out[x++] = inlen&255; + } else if (inlen < 16777216UL) { + out[x++] = 0x83; + out[x++] = (inlen>>16)&255; + out[x++] = (inlen>>8)&255; + out[x++] = inlen&255; + } else { + return CRYPT_INVALID_ARG; + } + + /* store octets */ + for (y = 0; y < inlen; y++) { + out[x++] = in[y]; + } + + /* retun length */ + *outlen = x; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_encode_octet_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/octet/der_length_octet_string.c b/libtomcrypt/src/pk/asn1/der/octet/der_length_octet_string.c new file mode 100644 index 0000000..9a0bed3 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/octet/der_length_octet_string.c @@ -0,0 +1,53 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_octet_string.c + ASN.1 DER, get length of OCTET STRING, Tom St Denis +*/ + +#ifdef LTC_DER +/** + Gets length of DER encoding of OCTET STRING + @param noctets The number of octets in the string to encode + @param outlen [out] The length of the DER encoding for the given string + @return CRYPT_OK if successful +*/ +int der_length_octet_string(unsigned long noctets, unsigned long *outlen) +{ + LTC_ARGCHK(outlen != NULL); + + if (noctets < 128) { + /* 04 LL DD DD DD ... */ + *outlen = 2 + noctets; + } else if (noctets < 256) { + /* 04 81 LL DD DD DD ... */ + *outlen = 3 + noctets; + } else if (noctets < 65536UL) { + /* 04 82 LL LL DD DD DD ... */ + *outlen = 4 + noctets; + } else if (noctets < 16777216UL) { + /* 04 83 LL LL LL DD DD DD ... */ + *outlen = 5 + noctets; + } else { + return CRYPT_INVALID_ARG; + } + + return CRYPT_OK; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/octet/der_length_octet_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/16 15:08:11 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/printable_string/der_decode_printable_string.c b/libtomcrypt/src/pk/asn1/der/printable_string/der_decode_printable_string.c new file mode 100644 index 0000000..cbc9239 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/printable_string/der_decode_printable_string.c @@ -0,0 +1,95 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_printable_string.c + ASN.1 DER, encode a printable STRING, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Store a printable STRING + @param in The DER encoded printable STRING + @param inlen The size of the DER printable STRING + @param out [out] The array of octets stored (one per char) + @param outlen [in/out] The number of octets stored + @return CRYPT_OK if successful +*/ +int der_decode_printable_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x, y, len; + int t; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* must have header at least */ + if (inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* check for 0x13 */ + if ((in[0] & 0x1F) != 0x13) { + return CRYPT_INVALID_PACKET; + } + x = 1; + + /* decode the length */ + if (in[x] & 0x80) { + /* valid # of bytes in length are 1,2,3 */ + y = in[x] & 0x7F; + if ((y == 0) || (y > 3) || ((x + y) > inlen)) { + return CRYPT_INVALID_PACKET; + } + + /* read the length in */ + len = 0; + ++x; + while (y--) { + len = (len << 8) | in[x++]; + } + } else { + len = in[x++] & 0x7F; + } + + /* is it too long? */ + if (len > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + if (len + x > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* read the data */ + for (y = 0; y < len; y++) { + t = der_printable_value_decode(in[x++]); + if (t == -1) { + return CRYPT_INVALID_ARG; + } + out[y] = t; + } + + *outlen = y; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_decode_printable_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/21 02:29:54 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c b/libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c new file mode 100644 index 0000000..ab4e8bf --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c @@ -0,0 +1,84 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_printable_string.c + ASN.1 DER, encode a printable STRING, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Store an printable STRING + @param in The array of printable to store (one per char) + @param inlen The number of printable to store + @param out [out] The destination for the DER encoded printable STRING + @param outlen [in/out] The max size and resulting size of the DER printable STRING + @return CRYPT_OK if successful +*/ +int der_encode_printable_string(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x, y, len; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* get the size */ + if ((err = der_length_printable_string(in, inlen, &len)) != CRYPT_OK) { + return err; + } + + /* too big? */ + if (len > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* encode the header+len */ + x = 0; + out[x++] = 0x13; + if (inlen < 128) { + out[x++] = inlen; + } else if (inlen < 256) { + out[x++] = 0x81; + out[x++] = inlen; + } else if (inlen < 65536UL) { + out[x++] = 0x82; + out[x++] = (inlen>>8)&255; + out[x++] = inlen&255; + } else if (inlen < 16777216UL) { + out[x++] = 0x83; + out[x++] = (inlen>>16)&255; + out[x++] = (inlen>>8)&255; + out[x++] = inlen&255; + } else { + return CRYPT_INVALID_ARG; + } + + /* store octets */ + for (y = 0; y < inlen; y++) { + out[x++] = der_printable_char_encode(in[y]); + } + + /* retun length */ + *outlen = x; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_encode_printable_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/21 02:29:54 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c b/libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c new file mode 100644 index 0000000..34065f2 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c @@ -0,0 +1,166 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_printable_string.c + ASN.1 DER, get length of Printable STRING, Tom St Denis +*/ + +#ifdef LTC_DER + +static const struct { + int code, value; +} printable_table[] = { +{ ' ', 32 }, +{ '\'', 39 }, +{ '(', 40 }, +{ ')', 41 }, +{ '+', 43 }, +{ ',', 44 }, +{ '-', 45 }, +{ '.', 46 }, +{ '/', 47 }, +{ '0', 48 }, +{ '1', 49 }, +{ '2', 50 }, +{ '3', 51 }, +{ '4', 52 }, +{ '5', 53 }, +{ '6', 54 }, +{ '7', 55 }, +{ '8', 56 }, +{ '9', 57 }, +{ ':', 58 }, +{ '=', 61 }, +{ '?', 63 }, +{ 'A', 65 }, +{ 'B', 66 }, +{ 'C', 67 }, +{ 'D', 68 }, +{ 'E', 69 }, +{ 'F', 70 }, +{ 'G', 71 }, +{ 'H', 72 }, +{ 'I', 73 }, +{ 'J', 74 }, +{ 'K', 75 }, +{ 'L', 76 }, +{ 'M', 77 }, +{ 'N', 78 }, +{ 'O', 79 }, +{ 'P', 80 }, +{ 'Q', 81 }, +{ 'R', 82 }, +{ 'S', 83 }, +{ 'T', 84 }, +{ 'U', 85 }, +{ 'V', 86 }, +{ 'W', 87 }, +{ 'X', 88 }, +{ 'Y', 89 }, +{ 'Z', 90 }, +{ 'a', 97 }, +{ 'b', 98 }, +{ 'c', 99 }, +{ 'd', 100 }, +{ 'e', 101 }, +{ 'f', 102 }, +{ 'g', 103 }, +{ 'h', 104 }, +{ 'i', 105 }, +{ 'j', 106 }, +{ 'k', 107 }, +{ 'l', 108 }, +{ 'm', 109 }, +{ 'n', 110 }, +{ 'o', 111 }, +{ 'p', 112 }, +{ 'q', 113 }, +{ 'r', 114 }, +{ 's', 115 }, +{ 't', 116 }, +{ 'u', 117 }, +{ 'v', 118 }, +{ 'w', 119 }, +{ 'x', 120 }, +{ 'y', 121 }, +{ 'z', 122 }, +}; + +int der_printable_char_encode(int c) +{ + int x; + for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) { + if (printable_table[x].code == c) { + return printable_table[x].value; + } + } + return -1; +} + +int der_printable_value_decode(int v) +{ + int x; + for (x = 0; x < (int)(sizeof(printable_table)/sizeof(printable_table[0])); x++) { + if (printable_table[x].value == v) { + return printable_table[x].code; + } + } + return -1; +} + +/** + Gets length of DER encoding of Printable STRING + @param octets The values you want to encode + @param noctets The number of octets in the string to encode + @param outlen [out] The length of the DER encoding for the given string + @return CRYPT_OK if successful +*/ +int der_length_printable_string(const unsigned char *octets, unsigned long noctets, unsigned long *outlen) +{ + unsigned long x; + + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(octets != NULL); + + /* scan string for validity */ + for (x = 0; x < noctets; x++) { + if (der_printable_char_encode(octets[x]) == -1) { + return CRYPT_INVALID_ARG; + } + } + + if (noctets < 128) { + /* 16 LL DD DD DD ... */ + *outlen = 2 + noctets; + } else if (noctets < 256) { + /* 16 81 LL DD DD DD ... */ + *outlen = 3 + noctets; + } else if (noctets < 65536UL) { + /* 16 82 LL LL DD DD DD ... */ + *outlen = 4 + noctets; + } else if (noctets < 16777216UL) { + /* 16 83 LL LL LL DD DD DD ... */ + *outlen = 5 + noctets; + } else { + return CRYPT_INVALID_ARG; + } + + return CRYPT_OK; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/printable_string/der_length_printable_string.c,v $ */ +/* $Revision: 1.1 $ */ +/* $Date: 2005/05/21 02:29:54 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence.c b/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence.c new file mode 100644 index 0000000..335a882 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence.c @@ -0,0 +1,234 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" +#include <stdarg.h> + + +/** + @file der_decode_sequence.c + ASN.1 DER, decode a SEQUENCE, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Decode a SEQUENCE + @param in The DER encoded input + @param inlen The size of the input + @param list The list of items to decode + @param outlen The number of items in the list + @return CRYPT_OK on success +*/ +int der_decode_sequence(const unsigned char *in, unsigned long inlen, + ltc_asn1_list *list, unsigned long outlen) +{ + int err, type; + unsigned long size, x, y, z, i, blksize; + void *data; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(list != NULL); + + /* get blk size */ + if (inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* sequence type? */ + x = 0; + if (in[x++] != 0x30) { + return CRYPT_INVALID_PACKET; + } + + if (in[x] < 128) { + blksize = in[x++]; + } else if (in[x] & 0x80) { + if (in[x] < 0x81 || in[x] > 0x83) { + return CRYPT_INVALID_PACKET; + } + y = in[x++] & 0x7F; + + /* would reading the len bytes overrun? */ + if (x + y > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* read len */ + blksize = 0; + while (y--) { + blksize = (blksize << 8) | (unsigned long)in[x++]; + } + } + + /* would this blksize overflow? */ + if (x + blksize > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* ok read data */ + inlen = blksize; + for (i = 0; i < outlen; i++) { + type = list[i].type; + size = list[i].size; + data = list[i].data; + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + z = inlen; + if ((err = der_decode_integer(in + x, z, data)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = der_length_integer(data, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + + case LTC_ASN1_SHORT_INTEGER: + z = inlen; + if ((err = der_decode_short_integer(in + x, z, data)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = der_length_short_integer(size, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + case LTC_ASN1_BIT_STRING: + z = inlen; + if ((err = der_decode_bit_string(in + x, z, data, &size)) != CRYPT_OK) { + goto LBL_ERR; + } + list[i].size = size; + if ((err = der_length_bit_string(size, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + case LTC_ASN1_OCTET_STRING: + z = inlen; + if ((err = der_decode_octet_string(in + x, z, data, &size)) != CRYPT_OK) { + goto LBL_ERR; + } + list[i].size = size; + if ((err = der_length_octet_string(size, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + case LTC_ASN1_NULL: + if (inlen < 2 || in[x] != 0x05 || in[x+1] != 0x00) { + err = CRYPT_INVALID_PACKET; + goto LBL_ERR; + } + x += 2; + inlen -= 2; + break; + + case LTC_ASN1_OBJECT_IDENTIFIER: + z = inlen; + if ((err = der_decode_object_identifier(in + x, z, data, &size)) != CRYPT_OK) { + goto LBL_ERR; + } + list[i].size = size; + if ((err = der_length_object_identifier(data, size, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + case LTC_ASN1_IA5_STRING: + z = inlen; + if ((err = der_decode_ia5_string(in + x, z, data, &size)) != CRYPT_OK) { + goto LBL_ERR; + } + list[i].size = size; + if ((err = der_length_ia5_string(data, size, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + + case LTC_ASN1_PRINTABLE_STRING: + z = inlen; + if ((err = der_decode_printable_string(in + x, z, data, &size)) != CRYPT_OK) { + goto LBL_ERR; + } + list[i].size = size; + if ((err = der_length_printable_string(data, size, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + case LTC_ASN1_UTCTIME: + z = inlen; + if ((err = der_decode_utctime(in + x, &z, data)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + case LTC_ASN1_SEQUENCE: + z = inlen; + if ((err = der_decode_sequence(in + x, z, data, size)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = der_length_sequence(data, size, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + + case LTC_ASN1_CHOICE: + z = inlen; + if ((err = der_decode_choice(in + x, &z, data, size)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + inlen -= z; + break; + + default: + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + } + err = CRYPT_OK; + +LBL_ERR: + return err; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence.c,v $ */ +/* $Revision: 1.8 $ */ +/* $Date: 2005/06/18 19:20:23 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_multi.c b/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_multi.c new file mode 100644 index 0000000..a4a1038 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_multi.c @@ -0,0 +1,124 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" +#include <stdarg.h> + + +/** + @file der_decode_sequence_multi.c + ASN.1 DER, decode a SEQUENCE, Tom St Denis +*/ + +#ifdef LTC_DER + +int der_decode_sequence_multi(const unsigned char *in, unsigned long inlen, ...) +{ + int err, type; + unsigned long size, x; + void *data; + va_list args; + ltc_asn1_list *list; + + LTC_ARGCHK(in != NULL); + + /* get size of output that will be required */ + va_start(args, inlen); + x = 0; + for (;;) { + type = va_arg(args, int); + size = va_arg(args, unsigned long); + data = va_arg(args, void*); + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + case LTC_ASN1_SHORT_INTEGER: + case LTC_ASN1_BIT_STRING: + case LTC_ASN1_OCTET_STRING: + case LTC_ASN1_NULL: + case LTC_ASN1_OBJECT_IDENTIFIER: + case LTC_ASN1_IA5_STRING: + case LTC_ASN1_PRINTABLE_STRING: + case LTC_ASN1_UTCTIME: + case LTC_ASN1_SEQUENCE: + case LTC_ASN1_CHOICE: + ++x; + break; + + default: + va_end(args); + return CRYPT_INVALID_ARG; + } + } + va_end(args); + + /* allocate structure for x elements */ + if (x == 0) { + return CRYPT_NOP; + } + + list = XCALLOC(sizeof(*list), x); + if (list == NULL) { + return CRYPT_MEM; + } + + /* fill in the structure */ + va_start(args, inlen); + x = 0; + for (;;) { + type = va_arg(args, int); + size = va_arg(args, unsigned long); + data = va_arg(args, void*); + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + case LTC_ASN1_SHORT_INTEGER: + case LTC_ASN1_BIT_STRING: + case LTC_ASN1_OCTET_STRING: + case LTC_ASN1_NULL: + case LTC_ASN1_OBJECT_IDENTIFIER: + case LTC_ASN1_IA5_STRING: + case LTC_ASN1_PRINTABLE_STRING: + case LTC_ASN1_UTCTIME: + case LTC_ASN1_SEQUENCE: + case LTC_ASN1_CHOICE: + list[x].type = type; + list[x].size = size; + list[x++].data = data; + break; + + default: + va_end(args); + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + } + va_end(args); + + err = der_decode_sequence(in, inlen, list, x); +LBL_ERR: + XFREE(list); + return err; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_multi.c,v $ */ +/* $Revision: 1.7 $ */ +/* $Date: 2005/06/18 19:20:23 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/sequence/der_encode_sequence.c b/libtomcrypt/src/pk/asn1/der/sequence/der_encode_sequence.c new file mode 100644 index 0000000..d53153c --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/sequence/der_encode_sequence.c @@ -0,0 +1,281 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" +#include <stdarg.h> + + +/** + @file der_encode_sequence.c + ASN.1 DER, encode a SEQUENCE, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Encode a SEQUENCE + @param list The list of items to encode + @param inlen The number of items in the list + @param out [out] The destination + @param outlen [in/out] The size of the output + @return CRYPT_OK on success +*/ +int der_encode_sequence(ltc_asn1_list *list, unsigned long inlen, + unsigned char *out, unsigned long *outlen) +{ + int err, type; + unsigned long size, x, y, z, i; + void *data; + + LTC_ARGCHK(list != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* get size of output that will be required */ + y = 0; + for (i = 0; i < inlen; i++) { + type = list[i].type; + size = list[i].size; + data = list[i].data; + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + if ((err = der_length_integer(data, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_SHORT_INTEGER: + if ((err = der_length_short_integer(*((unsigned long*)data), &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_BIT_STRING: + if ((err = der_length_bit_string(size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_OCTET_STRING: + if ((err = der_length_octet_string(size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_NULL: + y += 2; + break; + + case LTC_ASN1_OBJECT_IDENTIFIER: + if ((err = der_length_object_identifier(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_IA5_STRING: + if ((err = der_length_ia5_string(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_PRINTABLE_STRING: + if ((err = der_length_printable_string(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_UTCTIME: + if ((err = der_length_utctime(data, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_SEQUENCE: + if ((err = der_length_sequence(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + + default: + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + } + + /* calc header size */ + z = y; + if (y < 128) { + y += 2; + } else if (y < 256) { + /* 0x30 0x81 LL */ + y += 3; + } else if (y < 65536UL) { + /* 0x30 0x82 LL LL */ + y += 4; + } else if (y < 16777216UL) { + /* 0x30 0x83 LL LL LL */ + y += 5; + } else { + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + + /* too big ? */ + if (*outlen < y) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* store header */ + x = 0; + out[x++] = 0x30; + if (z < 128) { + out[x++] = z; + } else if (z < 256) { + out[x++] = 0x81; + out[x++] = z; + } else if (z < 65536UL) { + out[x++] = 0x82; + out[x++] = (z>>8UL)&255; + out[x++] = z&255; + } else if (z < 16777216UL) { + out[x++] = 0x83; + out[x++] = (z>>16UL)&255; + out[x++] = (z>>8UL)&255; + out[x++] = z&255; + } + + /* store data */ + *outlen -= x; + for (i = 0; i < inlen; i++) { + type = list[i].type; + size = list[i].size; + data = list[i].data; + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + z = *outlen; + if ((err = der_encode_integer(data, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_SHORT_INTEGER: + z = *outlen; + if ((err = der_encode_short_integer(*((unsigned long*)data), out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_BIT_STRING: + z = *outlen; + if ((err = der_encode_bit_string(data, size, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_OCTET_STRING: + z = *outlen; + if ((err = der_encode_octet_string(data, size, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_NULL: + out[x++] = 0x05; + out[x++] = 0x00; + *outlen -= 2; + break; + + case LTC_ASN1_OBJECT_IDENTIFIER: + z = *outlen; + if ((err = der_encode_object_identifier(data, size, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_IA5_STRING: + z = *outlen; + if ((err = der_encode_ia5_string(data, size, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_PRINTABLE_STRING: + z = *outlen; + if ((err = der_encode_printable_string(data, size, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_UTCTIME: + z = *outlen; + if ((err = der_encode_utctime(data, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + case LTC_ASN1_SEQUENCE: + z = *outlen; + if ((err = der_encode_sequence(data, size, out + x, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + x += z; + *outlen -= z; + break; + + default: + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + } + *outlen = x; + err = CRYPT_OK; + +LBL_ERR: + return err; +} + +#endif diff --git a/libtomcrypt/src/pk/asn1/der/sequence/der_encode_sequence_multi.c b/libtomcrypt/src/pk/asn1/der/sequence/der_encode_sequence_multi.c new file mode 100644 index 0000000..9ff48b9 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/sequence/der_encode_sequence_multi.c @@ -0,0 +1,123 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" +#include <stdarg.h> + + +/** + @file der_encode_sequence_multi.c + ASN.1 DER, encode a SEQUENCE, Tom St Denis +*/ + +#ifdef LTC_DER + +int der_encode_sequence_multi(unsigned char *out, unsigned long *outlen, ...) +{ + int err, type; + unsigned long size, x; + void *data; + va_list args; + ltc_asn1_list *list; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* get size of output that will be required */ + va_start(args, outlen); + x = 0; + for (;;) { + type = va_arg(args, int); + size = va_arg(args, unsigned long); + data = va_arg(args, void*); + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + case LTC_ASN1_SHORT_INTEGER: + case LTC_ASN1_BIT_STRING: + case LTC_ASN1_OCTET_STRING: + case LTC_ASN1_NULL: + case LTC_ASN1_OBJECT_IDENTIFIER: + case LTC_ASN1_IA5_STRING: + case LTC_ASN1_PRINTABLE_STRING: + case LTC_ASN1_UTCTIME: + case LTC_ASN1_SEQUENCE: + ++x; + break; + + default: + va_end(args); + return CRYPT_INVALID_ARG; + } + } + va_end(args); + + /* allocate structure for x elements */ + if (x == 0) { + return CRYPT_NOP; + } + + list = XCALLOC(sizeof(*list), x); + if (list == NULL) { + return CRYPT_MEM; + } + + /* fill in the structure */ + va_start(args, outlen); + x = 0; + for (;;) { + type = va_arg(args, int); + size = va_arg(args, unsigned long); + data = va_arg(args, void*); + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + case LTC_ASN1_SHORT_INTEGER: + case LTC_ASN1_BIT_STRING: + case LTC_ASN1_OCTET_STRING: + case LTC_ASN1_NULL: + case LTC_ASN1_OBJECT_IDENTIFIER: + case LTC_ASN1_IA5_STRING: + case LTC_ASN1_PRINTABLE_STRING: + case LTC_ASN1_UTCTIME: + case LTC_ASN1_SEQUENCE: + list[x].type = type; + list[x].size = size; + list[x++].data = data; + break; + + default: + va_end(args); + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + } + va_end(args); + + err = der_encode_sequence(list, x, out, outlen); +LBL_ERR: + XFREE(list); + return err; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/sequence/der_encode_sequence_multi.c,v $ */ +/* $Revision: 1.6 $ */ +/* $Date: 2005/06/18 19:20:23 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/sequence/der_length_sequence.c b/libtomcrypt/src/pk/asn1/der/sequence/der_length_sequence.c new file mode 100644 index 0000000..9120451 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/sequence/der_length_sequence.c @@ -0,0 +1,144 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" +#include <stdarg.h> + + +/** + @file der_length_sequence.c + ASN.1 DER, length a SEQUENCE, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Get the length of a DER sequence + @param list The sequences of items in the SEQUENCE + @param inlen The number of items + @param outlen [out] The length required in octets to store it + @return CRYPT_OK on success +*/ +int der_length_sequence(ltc_asn1_list *list, unsigned long inlen, + unsigned long *outlen) +{ + int err, type; + unsigned long size, x, y, z, i; + void *data; + + LTC_ARGCHK(list != NULL); + LTC_ARGCHK(outlen != NULL); + + /* get size of output that will be required */ + y = 0; + for (i = 0; i < inlen; i++) { + type = list[i].type; + size = list[i].size; + data = list[i].data; + + if (type == LTC_ASN1_EOL) { + break; + } + + switch (type) { + case LTC_ASN1_INTEGER: + if ((err = der_length_integer(data, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_SHORT_INTEGER: + if ((err = der_length_short_integer(*((unsigned long *)data), &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_BIT_STRING: + if ((err = der_length_bit_string(size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_OCTET_STRING: + if ((err = der_length_octet_string(size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_NULL: + y += 2; + break; + + case LTC_ASN1_OBJECT_IDENTIFIER: + if ((err = der_length_object_identifier(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_IA5_STRING: + if ((err = der_length_ia5_string(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_PRINTABLE_STRING: + if ((err = der_length_printable_string(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + case LTC_ASN1_SEQUENCE: + if ((err = der_length_sequence(data, size, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + break; + + + default: + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + } + + /* calc header size */ + z = y; + if (y < 128) { + y += 2; + } else if (y < 256) { + /* 0x30 0x81 LL */ + y += 3; + } else if (y < 65536UL) { + /* 0x30 0x82 LL LL */ + y += 4; + } else if (y < 16777216UL) { + /* 0x30 0x83 LL LL LL */ + y += 5; + } else { + err = CRYPT_INVALID_ARG; + goto LBL_ERR; + } + + /* store size */ + *outlen = y; + err = CRYPT_OK; + +LBL_ERR: + return err; +} + +#endif diff --git a/libtomcrypt/src/pk/asn1/der/short_integer/der_decode_short_integer.c b/libtomcrypt/src/pk/asn1/der/short_integer/der_decode_short_integer.c new file mode 100644 index 0000000..7d3d3b7 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/short_integer/der_decode_short_integer.c @@ -0,0 +1,68 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_short_integer.c + ASN.1 DER, decode an integer, Tom St Denis +*/ + + +#ifdef LTC_DER + +/** + Read a mp_int integer + @param in The DER encoded data + @param inlen Size of data + @param num [out] The integer to decode + @return CRYPT_OK if successful +*/ +int der_decode_short_integer(const unsigned char *in, unsigned long inlen, unsigned long *num) +{ + unsigned long len, x, y; + + LTC_ARGCHK(num != NULL); + LTC_ARGCHK(in != NULL); + + /* check length */ + if (inlen < 2) { + return CRYPT_INVALID_PACKET; + } + + /* check header */ + x = 0; + if ((in[x++] & 0x1F) != 0x02) { + return CRYPT_INVALID_PACKET; + } + + /* get the packet len */ + len = in[x++]; + + if (x + len > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* read number */ + y = 0; + while (len--) { + y = (y<<8) | (unsigned long)in[x++]; + } + *num = y; + + return CRYPT_OK; + +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/short_integer/der_decode_short_integer.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/05/23 01:04:13 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/short_integer/der_encode_short_integer.c b/libtomcrypt/src/pk/asn1/der/short_integer/der_encode_short_integer.c new file mode 100644 index 0000000..eb94d38 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/short_integer/der_encode_short_integer.c @@ -0,0 +1,97 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_short_integer.c + ASN.1 DER, encode an integer, Tom St Denis +*/ + + +#ifdef LTC_DER + +/* Exports a positive integer as DER format (upto 32-bits in size) */ +/** + Store a mp_int integer + @param num The integer to encode + @param out [out] The destination for the DER encoded integers + @param outlen [in/out] The max size and resulting size of the DER encoded integers + @return CRYPT_OK if successful +*/ +int der_encode_short_integer(unsigned long num, unsigned char *out, unsigned long *outlen) +{ + unsigned long len, x, y, z; + int err; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* force to 32 bits */ + num &= 0xFFFFFFFFUL; + + /* find out how big this will be */ + if ((err = der_length_short_integer(num, &len)) != CRYPT_OK) { + return err; + } + + if (*outlen < len) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* get len of output */ + z = 0; + y = num; + while (y) { + ++z; + y >>= 8; + } + + /* handle zero */ + if (z == 0) { + z = 1; + } + + /* see if msb is set */ + z += (num&(1UL<<((z<<3) - 1))) ? 1 : 0; + + /* adjust the number so the msB is non-zero */ + for (x = 0; (z <= 4) && (x < (4 - z)); x++) { + num <<= 8; + } + + /* store header */ + x = 0; + out[x++] = 0x02; + out[x++] = z; + + /* if 31st bit is set output a leading zero and decrement count */ + if (z == 5) { + out[x++] = 0; + --z; + } + + /* store values */ + for (y = 0; y < z; y++) { + out[x++] = (num >> 24) & 0xFF; + num <<= 8; + } + + /* we good */ + *outlen = x; + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/short_integer/der_encode_short_integer.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/23 01:27:03 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/short_integer/der_length_short_integer.c b/libtomcrypt/src/pk/asn1/der/short_integer/der_length_short_integer.c new file mode 100644 index 0000000..7324b4a --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/short_integer/der_length_short_integer.c @@ -0,0 +1,69 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_short_integer.c + ASN.1 DER, get length of encoding, Tom St Denis +*/ + + +#ifdef LTC_DER +/** + Gets length of DER encoding of num + @param num The integer to get the size of + @param outlen [out] The length of the DER encoding for the given integer + @return CRYPT_OK if successful +*/ +int der_length_short_integer(unsigned long num, unsigned long *outlen) +{ + unsigned long z, y, len; + + LTC_ARGCHK(outlen != NULL); + + /* force to 32 bits */ + num &= 0xFFFFFFFFUL; + + /* get the number of bytes */ + z = 0; + y = num; + while (y) { + ++z; + y >>= 8; + } + + /* handle zero */ + if (z == 0) { + z = 1; + } + + /* we need a 0x02 to indicate it's INTEGER */ + len = 1; + + /* length byte */ + ++len; + + /* bytes in value */ + len += z; + + /* see if msb is set */ + len += (num&(1UL<<((z<<3) - 1))) ? 1 : 0; + + /* return length */ + *outlen = len; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/short_integer/der_length_short_integer.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/23 01:35:38 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c b/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c new file mode 100644 index 0000000..43ba033 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c @@ -0,0 +1,120 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_decode_utctime.c + ASN.1 DER, decode a UTCTIME, Tom St Denis +*/ + +#ifdef LTC_DER + +static int char_to_int(unsigned char x) +{ + switch (x) { + case '0': return 0; + case '1': return 1; + case '2': return 2; + case '3': return 3; + case '4': return 4; + case '5': return 5; + case '6': return 6; + case '7': return 7; + case '8': return 8; + case '9': return 9; + } + return 100; +} + +#define DECODE_V(y, max) \ + y = char_to_int(buf[x])*10 + char_to_int(buf[x+1]); \ + if (y >= max) return CRYPT_INVALID_PACKET; \ + x += 2; + +int der_decode_utctime(const unsigned char *in, unsigned long *inlen, + ltc_utctime *out) +{ + unsigned char buf[32]; + unsigned long x; + int y; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(inlen != NULL); + LTC_ARGCHK(out != NULL); + + /* check header */ + if (*inlen < 2UL || (in[1] >= sizeof(buf)) || ((in[1] + 2UL) > *inlen)) { + return CRYPT_INVALID_PACKET; + } + + /* decode the string */ + for (x = 0; x < in[1]; x++) { + y = der_ia5_value_decode(in[x+2]); + if (y == -1) { + return CRYPT_INVALID_PACKET; + } + buf[x] = y; + } + *inlen = 2 + x; + + + /* possible encodings are +YYMMDDhhmmZ +YYMMDDhhmm+hh'mm' +YYMMDDhhmm-hh'mm' +YYMMDDhhmmssZ +YYMMDDhhmmss+hh'mm' +YYMMDDhhmmss-hh'mm' + + So let's do a trivial decode upto [including] mm + */ + + x = 0; + DECODE_V(out->YY, 100); + DECODE_V(out->MM, 13); + DECODE_V(out->DD, 32); + DECODE_V(out->hh, 24); + DECODE_V(out->mm, 60); + + /* clear timezone and seconds info */ + out->off_dir = out->off_hh = out->off_mm = out->ss = 0; + + /* now is it Z, +, - or 0-9 */ + if (buf[x] == 'Z') { + return CRYPT_OK; + } else if (buf[x] == '+' || buf[x] == '-') { + out->off_dir = (buf[x++] == '+') ? 0 : 1; + DECODE_V(out->off_hh, 24); + DECODE_V(out->off_mm, 60); + return CRYPT_OK; + } + + /* decode seconds */ + DECODE_V(out->ss, 60); + + /* now is it Z, +, - */ + if (buf[x] == 'Z') { + return CRYPT_OK; + } else if (buf[x] == '+' || buf[x] == '-') { + out->off_dir = (buf[x++] == '+') ? 0 : 1; + DECODE_V(out->off_hh, 24); + DECODE_V(out->off_mm, 60); + return CRYPT_OK; + } else { + return CRYPT_INVALID_PACKET; + } +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_decode_utctime.c,v $ */ +/* $Revision: 1.6 $ */ +/* $Date: 2005/06/19 12:07:00 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c b/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c new file mode 100644 index 0000000..dad8c84 --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c @@ -0,0 +1,80 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_encode_utctime.c + ASN.1 DER, encode a UTCTIME, Tom St Denis +*/ + +#ifdef LTC_DER + +static const char *baseten = "0123456789"; + +#define STORE_V(y) \ + out[x++] = der_ia5_char_encode(baseten[(y/10) % 10]); \ + out[x++] = der_ia5_char_encode(baseten[y % 10]); + +/** + Gets length of DER encoding of UTCTIME + @param outlen [out] The length of the DER encoding + @return CRYPT_OK if successful +*/ +int der_encode_utctime(ltc_utctime *utctime, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x, tmplen; + int err; + + LTC_ARGCHK(utctime != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + if ((err = der_length_utctime(utctime, &tmplen)) != CRYPT_OK) { + return err; + } + if (tmplen > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* store header */ + out[0] = 0x17; + + /* store values */ + x = 2; + STORE_V(utctime->YY); + STORE_V(utctime->MM); + STORE_V(utctime->DD); + STORE_V(utctime->hh); + STORE_V(utctime->mm); + STORE_V(utctime->ss); + + if (utctime->off_mm || utctime->off_hh) { + out[x++] = der_ia5_char_encode(utctime->off_dir ? '-' : '+'); + STORE_V(utctime->off_hh); + STORE_V(utctime->off_mm); + } else { + out[x++] = der_ia5_char_encode('Z'); + } + + /* store length */ + out[1] = x - 2; + + /* all good let's return */ + *outlen = x; + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_encode_utctime.c,v $ */ +/* $Revision: 1.5 $ */ +/* $Date: 2005/06/19 12:07:00 $ */ diff --git a/libtomcrypt/src/pk/asn1/der/utctime/der_length_utctime.c b/libtomcrypt/src/pk/asn1/der/utctime/der_length_utctime.c new file mode 100644 index 0000000..84e654a --- /dev/null +++ b/libtomcrypt/src/pk/asn1/der/utctime/der_length_utctime.c @@ -0,0 +1,45 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file der_length_utctime.c + ASN.1 DER, get length of UTCTIME, Tom St Denis +*/ + +#ifdef LTC_DER + +/** + Gets length of DER encoding of UTCTIME + @param outlen [out] The length of the DER encoding + @return CRYPT_OK if successful +*/ +int der_length_utctime(ltc_utctime *utctime, unsigned long *outlen) +{ + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(utctime != NULL); + + if (utctime->off_hh == 0 && utctime->off_mm == 0) { + /* we encode as YYMMDDhhmmssZ */ + *outlen = 2 + 13; + } else { + /* we encode as YYMMDDhhmmss{+|-}hh'mm' */ + *outlen = 2 + 17; + } + + return CRYPT_OK; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/asn1/der/utctime/der_length_utctime.c,v $ */ +/* $Revision: 1.2 $ */ +/* $Date: 2005/06/19 11:23:04 $ */ diff --git a/libtomcrypt/src/pk/dh/dh.c b/libtomcrypt/src/pk/dh/dh.c new file mode 100644 index 0000000..a54f29b --- /dev/null +++ b/libtomcrypt/src/pk/dh/dh.c @@ -0,0 +1,524 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dh.c + DH crypto, Tom St Denis +*/ + +#ifdef MDH + +/* max export size we'll encounter (smaller than this but lets round up a bit) */ +#define DH_BUF_SIZE 1200 + +/* This holds the key settings. ***MUST*** be organized by size from smallest to largest. */ +static const struct { + int size; + char *name, *base, *prime; +} sets[] = { +#ifdef DH768 +{ + 96, + "DH-768", + "4", + "F///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "//////m3wvV" +}, +#endif +#ifdef DH1024 +{ + 128, + "DH-1024", + "4", + "F///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////m3C47" +}, +#endif +#ifdef DH1280 +{ + 160, + "DH-1280", + "4", + "F///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "//////////////////////////////m4kSN" +}, +#endif +#ifdef DH1536 +{ + 192, + "DH-1536", + "4", + "F///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////m5uqd" +}, +#endif +#ifdef DH1792 +{ + 224, + "DH-1792", + "4", + "F///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "//////////////////////////////////////////////////////mT/sd" +}, +#endif +#ifdef DH2048 +{ + 256, + "DH-2048", + "4", + "3///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "/////////////////////////////////////////m8MPh" +}, +#endif +#ifdef DH2560 +{ + 320, + "DH-2560", + "4", + "3///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "/////mKFpF" +}, +#endif +#ifdef DH3072 +{ + 384, + "DH-3072", + "4", + "3///////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "/////////////////////////////m32nN" +}, +#endif +#ifdef DH4096 +{ + 512, + "DH-4096", + "4", + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "////////////////////////////////////////////////////////////" + "/////////////////////m8pOF" +}, +#endif +{ + 0, + NULL, + NULL, + NULL +} +}; + +static int is_valid_idx(int n) +{ + int x; + + for (x = 0; sets[x].size; x++); + if ((n < 0) || (n >= x)) { + return 0; + } + return 1; +} + +/** + Test the DH sub-system (can take a while) + @return CRYPT_OK if successful +*/ +int dh_test(void) +{ + mp_int p, g, tmp; + int x, err, primality; + + if ((err = mp_init_multi(&p, &g, &tmp, NULL)) != MP_OKAY) { goto error; } + + for (x = 0; sets[x].size != 0; x++) { +#if 0 + printf("dh_test():testing size %d-bits\n", sets[x].size * 8); +#endif + if ((err = mp_read_radix(&g,(char *)sets[x].base, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&p,(char *)sets[x].prime, 64)) != MP_OKAY) { goto error; } + + /* ensure p is prime */ + if ((err = is_prime(&p, &primality)) != CRYPT_OK) { goto done; } + if (primality == 0) { + err = CRYPT_FAIL_TESTVECTOR; + goto done; + } + + if ((err = mp_sub_d(&p, 1, &tmp)) != MP_OKAY) { goto error; } + if ((err = mp_div_2(&tmp, &tmp)) != MP_OKAY) { goto error; } + + /* ensure (p-1)/2 is prime */ + if ((err = is_prime(&tmp, &primality)) != CRYPT_OK) { goto done; } + if (primality == 0) { + err = CRYPT_FAIL_TESTVECTOR; + goto done; + } + + /* now see if g^((p-1)/2) mod p is in fact 1 */ + if ((err = mp_exptmod(&g, &tmp, &p, &tmp)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&tmp, 1)) { + err = CRYPT_FAIL_TESTVECTOR; + goto done; + } + } + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + mp_clear_multi(&tmp, &g, &p, NULL); + return err; +} + +/** + Get the min and max DH key sizes (octets) + @param low [out] The smallest key size supported + @param high [out] The largest key size supported +*/ +void dh_sizes(int *low, int *high) +{ + int x; + LTC_ARGCHK(low != NULL); + LTC_ARGCHK(high != NULL); + *low = INT_MAX; + *high = 0; + for (x = 0; sets[x].size != 0; x++) { + if (*low > sets[x].size) *low = sets[x].size; + if (*high < sets[x].size) *high = sets[x].size; + } +} + +/** + Returns the key size of a given DH key (octets) + @param key The DH key to get the size of + @return The size if valid or INT_MAX if not +*/ +int dh_get_size(dh_key *key) +{ + LTC_ARGCHK(key != NULL); + if (is_valid_idx(key->idx) == 1) { + return sets[key->idx].size; + } else { + return INT_MAX; /* large value that would cause dh_make_key() to fail */ + } +} + +/** + Make a DH key [private key pair] + @param prng An active PRNG state + @param wprng The index for the PRNG you desire to use + @param keysize The key size (octets) desired + @param key [out] Where the newly created DH key will be stored + @return CRYPT_OK if successful, note: on error all allocated memory will be freed automatically. +*/ +int dh_make_key(prng_state *prng, int wprng, int keysize, dh_key *key) +{ + unsigned char *buf; + unsigned long x; + mp_int p, g; + int err; + + LTC_ARGCHK(key != NULL); + + /* good prng? */ + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + /* find key size */ + for (x = 0; (keysize > sets[x].size) && (sets[x].size != 0); x++); +#ifdef FAST_PK + keysize = MIN(sets[x].size, 32); +#else + keysize = sets[x].size; +#endif + + if (sets[x].size == 0) { + return CRYPT_INVALID_KEYSIZE; + } + key->idx = x; + + /* allocate buffer */ + buf = XMALLOC(keysize); + if (buf == NULL) { + return CRYPT_MEM; + } + + /* make up random string */ + if (prng_descriptor[wprng].read(buf, keysize, prng) != (unsigned long)keysize) { + err = CRYPT_ERROR_READPRNG; + goto error2; + } + + /* init parameters */ + if ((err = mp_init_multi(&g, &p, &key->x, &key->y, NULL)) != MP_OKAY) { + goto error; + } + if ((err = mp_read_radix(&g, sets[key->idx].base, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&p, sets[key->idx].prime, 64)) != MP_OKAY) { goto error; } + + /* load the x value */ + if ((err = mp_read_unsigned_bin(&key->x, buf, keysize)) != MP_OKAY) { goto error; } + if ((err = mp_exptmod(&g, &key->x, &p, &key->y)) != MP_OKAY) { goto error; } + key->type = PK_PRIVATE; + + if ((err = mp_shrink(&key->x)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->y)) != MP_OKAY) { goto error; } + + /* free up ram */ + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +error2: + mp_clear_multi(&key->x, &key->y, NULL); +done: +#ifdef LTC_CLEAN_STACK + zeromem(buf, keysize); +#endif + mp_clear_multi(&p, &g, NULL); + XFREE(buf); + return err; +} + +/** + Free the allocated ram for a DH key + @param key The key which you wish to free +*/ +void dh_free(dh_key *key) +{ + LTC_ARGCHK(key != NULL); + mp_clear_multi(&key->x, &key->y, NULL); +} + +/** + Export a DH key to a binary packet + @param out [out] The destination for the key + @param outlen [in/out] The max size and resulting size of the DH key + @param type Which type of key (PK_PRIVATE or PK_PUBLIC) + @param key The key you wish to export + @return CRYPT_OK if successful +*/ +int dh_export(unsigned char *out, unsigned long *outlen, int type, dh_key *key) +{ + unsigned long y, z; + int err; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* can we store the static header? */ + if (*outlen < (PACKET_SIZE + 2)) { + return CRYPT_BUFFER_OVERFLOW; + } + + if (type == PK_PRIVATE && key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + /* header */ + y = PACKET_SIZE; + + /* header */ + out[y++] = type; + out[y++] = (unsigned char)(sets[key->idx].size / 8); + + /* export y */ + OUTPUT_BIGNUM(&key->y, out, y, z); + + if (type == PK_PRIVATE) { + /* export x */ + OUTPUT_BIGNUM(&key->x, out, y, z); + } + + /* store header */ + packet_store_header(out, PACKET_SECT_DH, PACKET_SUB_KEY); + + /* store len */ + *outlen = y; + return CRYPT_OK; +} + +/** + Import a DH key from a binary packet + @param in The packet to read + @param inlen The length of the input packet + @param key [out] Where to import the key to + @return CRYPT_OK if successful, on error all allocated memory is freed automatically +*/ +int dh_import(const unsigned char *in, unsigned long inlen, dh_key *key) +{ + unsigned long x, y, s; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(key != NULL); + + /* make sure valid length */ + if ((2+PACKET_SIZE) > inlen) { + return CRYPT_INVALID_PACKET; + } + + /* check type byte */ + if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_DH, PACKET_SUB_KEY)) != CRYPT_OK) { + return err; + } + + /* init */ + if ((err = mp_init_multi(&key->x, &key->y, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + /* advance past packet header */ + y = PACKET_SIZE; + + /* key type, e.g. private, public */ + key->type = (int)in[y++]; + + /* key size in bytes */ + s = (unsigned long)in[y++] * 8; + + for (x = 0; (s > (unsigned long)sets[x].size) && (sets[x].size != 0); x++); + if (sets[x].size == 0) { + err = CRYPT_INVALID_KEYSIZE; + goto error; + } + key->idx = (int)x; + + /* type check both values */ + if ((key->type != PK_PUBLIC) && (key->type != PK_PRIVATE)) { + err = CRYPT_PK_TYPE_MISMATCH; + goto error; + } + + /* is the key idx valid? */ + if (is_valid_idx(key->idx) != 1) { + err = CRYPT_PK_TYPE_MISMATCH; + goto error; + } + + /* load public value g^x mod p*/ + INPUT_BIGNUM(&key->y, in, x, y, inlen); + + if (key->type == PK_PRIVATE) { + INPUT_BIGNUM(&key->x, in, x, y, inlen); + } + + /* eliminate private key if public */ + if (key->type == PK_PUBLIC) { + mp_clear(&key->x); + } + + return CRYPT_OK; +error: + mp_clear_multi(&key->y, &key->x, NULL); + return err; +} + +/** + Create a DH shared secret. + @param private_key The private DH key in the pair + @param public_key The public DH key in the pair + @param out [out] The destination of the shared data + @param outlen [in/out] The max size and resulting size of the shared data. + @return CRYPT_OK if successful +*/ +int dh_shared_secret(dh_key *private_key, dh_key *public_key, + unsigned char *out, unsigned long *outlen) +{ + mp_int tmp, p; + unsigned long x; + int err; + + LTC_ARGCHK(private_key != NULL); + LTC_ARGCHK(public_key != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* types valid? */ + if (private_key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + /* same idx? */ + if (private_key->idx != public_key->idx) { + return CRYPT_PK_TYPE_MISMATCH; + } + + /* compute y^x mod p */ + if ((err = mp_init_multi(&tmp, &p, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + if ((err = mp_read_radix(&p, (char *)sets[private_key->idx].prime, 64)) != MP_OKAY) { goto error; } + if ((err = mp_exptmod(&public_key->y, &private_key->x, &p, &tmp)) != MP_OKAY) { goto error; } + + /* enough space for output? */ + x = (unsigned long)mp_unsigned_bin_size(&tmp); + if (*outlen < x) { + err = CRYPT_BUFFER_OVERFLOW; + goto done; + } + if ((err = mp_to_unsigned_bin(&tmp, out)) != MP_OKAY) { goto error; } + *outlen = x; + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + mp_clear_multi(&p, &tmp, NULL); + return err; +} + +#include "dh_sys.c" + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dh/dh.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/dh/dh_sys.c b/libtomcrypt/src/pk/dh/dh_sys.c new file mode 100644 index 0000000..4f10556 --- /dev/null +++ b/libtomcrypt/src/pk/dh/dh_sys.c @@ -0,0 +1,499 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ + +/** + @file dh_sys.c + DH Crypto, Tom St Denis +*/ + +/** + Encrypt a short symmetric key with a public DH key + @param in The symmetric key to encrypt + @param inlen The length of the key (octets) + @param out [out] The ciphertext + @param outlen [in/out] The max size and resulting size of the ciphertext + @param prng An active PRNG state + @param wprng The index of the PRNG desired + @param hash The index of the hash desired (must produce a digest of size >= the size of the plaintext) + @param key The public key you wish to encrypt with. + @return CRYPT_OK if successful +*/ +int dh_encrypt_key(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + prng_state *prng, int wprng, int hash, + dh_key *key) +{ + unsigned char *pub_expt, *dh_shared, *skey; + dh_key pubkey; + unsigned long x, y, z, hashsize, pubkeysize; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* check that wprng/hash are not invalid */ + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + if ((err = hash_is_valid(hash)) != CRYPT_OK) { + return err; + } + + if (inlen > hash_descriptor[hash].hashsize) { + return CRYPT_INVALID_HASH; + } + + /* allocate memory */ + pub_expt = XMALLOC(DH_BUF_SIZE); + dh_shared = XMALLOC(DH_BUF_SIZE); + skey = XMALLOC(MAXBLOCKSIZE); + if (pub_expt == NULL || dh_shared == NULL || skey == NULL) { + if (pub_expt != NULL) { + XFREE(pub_expt); + } + if (dh_shared != NULL) { + XFREE(dh_shared); + } + if (skey != NULL) { + XFREE(skey); + } + return CRYPT_MEM; + } + + /* make a random key and export the public copy */ + if ((err = dh_make_key(prng, wprng, dh_get_size(key), &pubkey)) != CRYPT_OK) { + goto LBL_ERR; + } + + pubkeysize = DH_BUF_SIZE; + if ((err = dh_export(pub_expt, &pubkeysize, PK_PUBLIC, &pubkey)) != CRYPT_OK) { + dh_free(&pubkey); + goto LBL_ERR; + } + + /* now check if the out buffer is big enough */ + if (*outlen < (1 + 4 + 4 + PACKET_SIZE + pubkeysize + inlen)) { + dh_free(&pubkey); + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* make random key */ + hashsize = hash_descriptor[hash].hashsize; + + x = DH_BUF_SIZE; + if ((err = dh_shared_secret(&pubkey, key, dh_shared, &x)) != CRYPT_OK) { + dh_free(&pubkey); + goto LBL_ERR; + } + dh_free(&pubkey); + + z = MAXBLOCKSIZE; + if ((err = hash_memory(hash, dh_shared, x, skey, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* store header */ + packet_store_header(out, PACKET_SECT_DH, PACKET_SUB_ENC_KEY); + + /* output header */ + y = PACKET_SIZE; + + /* size of hash name and the name itself */ + out[y++] = hash_descriptor[hash].ID; + + /* length of DH pubkey and the key itself */ + STORE32L(pubkeysize, out+y); + y += 4; + for (x = 0; x < pubkeysize; x++, y++) { + out[y] = pub_expt[x]; + } + + /* Store the encrypted key */ + STORE32L(inlen, out+y); + y += 4; + + for (x = 0; x < inlen; x++, y++) { + out[y] = skey[x] ^ in[x]; + } + *outlen = y; + + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + /* clean up */ + zeromem(pub_expt, DH_BUF_SIZE); + zeromem(dh_shared, DH_BUF_SIZE); + zeromem(skey, MAXBLOCKSIZE); +#endif + XFREE(skey); + XFREE(dh_shared); + XFREE(pub_expt); + + return err; +} + +/** + Decrypt a DH encrypted symmetric key + @param in The DH encrypted packet + @param inlen The length of the DH encrypted packet + @param out The plaintext + @param outlen [in/out] The max size and resulting size of the plaintext + @param key The private DH key corresponding to the public key that encrypted the plaintext + @return CRYPT_OK if successful +*/ +int dh_decrypt_key(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + dh_key *key) +{ + unsigned char *shared_secret, *skey; + unsigned long x, y, z, hashsize, keysize; + int hash, err; + dh_key pubkey; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* right key type? */ + if (key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + /* allocate ram */ + shared_secret = XMALLOC(DH_BUF_SIZE); + skey = XMALLOC(MAXBLOCKSIZE); + if (shared_secret == NULL || skey == NULL) { + if (shared_secret != NULL) { + XFREE(shared_secret); + } + if (skey != NULL) { + XFREE(skey); + } + return CRYPT_MEM; + } + + /* check if initial header should fit */ + if (inlen < PACKET_SIZE+1+4+4) { + err = CRYPT_INVALID_PACKET; + goto LBL_ERR; + } else { + inlen -= PACKET_SIZE+1+4+4; + } + + /* is header correct? */ + if ((err = packet_valid_header((unsigned char *)in, PACKET_SECT_DH, PACKET_SUB_ENC_KEY)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* now lets get the hash name */ + y = PACKET_SIZE; + hash = find_hash_id(in[y++]); + if (hash == -1) { + err = CRYPT_INVALID_HASH; + goto LBL_ERR; + } + + /* common values */ + hashsize = hash_descriptor[hash].hashsize; + + /* get public key */ + LOAD32L(x, in+y); + + /* now check if the imported key will fit */ + if (inlen < x) { + err = CRYPT_INVALID_PACKET; + goto LBL_ERR; + } else { + inlen -= x; + } + + y += 4; + if ((err = dh_import(in+y, x, &pubkey)) != CRYPT_OK) { + goto LBL_ERR; + } + y += x; + + /* make shared key */ + x = DH_BUF_SIZE; + if ((err = dh_shared_secret(key, &pubkey, shared_secret, &x)) != CRYPT_OK) { + dh_free(&pubkey); + goto LBL_ERR; + } + dh_free(&pubkey); + + z = MAXBLOCKSIZE; + if ((err = hash_memory(hash, shared_secret, x, skey, &z)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* load in the encrypted key */ + LOAD32L(keysize, in+y); + + /* will the out fit as part of the input */ + if (inlen < keysize) { + err = CRYPT_INVALID_PACKET; + goto LBL_ERR; + } else { + inlen -= keysize; + } + + if (keysize > *outlen) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + y += 4; + + *outlen = keysize; + + for (x = 0; x < keysize; x++, y++) { + out[x] = skey[x] ^ in[y]; + } + + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(shared_secret, DH_BUF_SIZE); + zeromem(skey, MAXBLOCKSIZE); +#endif + + XFREE(skey); + XFREE(shared_secret); + + return err; +} + +/* perform an ElGamal Signature of a hash + * + * The math works as follows. x is the private key, M is the message to sign + + 1. pick a random k + 2. compute a = g^k mod p + 3. compute b = (M - xa)/k mod p + 4. Send (a,b) + + Now to verify with y=g^x mod p, a and b + + 1. compute y^a * a^b = g^(xa) * g^(k*(M-xa)/k) + = g^(xa + (M - xa)) + = g^M [all mod p] + + 2. Compare against g^M mod p [based on input hash]. + 3. If result of #2 == result of #1 then signature valid +*/ + +/** + Sign a message digest using a DH private key + @param in The data to sign + @param inlen The length of the input (octets) + @param out [out] The destination of the signature + @param outlen [in/out] The max size and resulting size of the output + @param prng An active PRNG state + @param wprng The index of the PRNG desired + @param key A private DH key + @return CRYPT_OK if successful +*/ +int dh_sign_hash(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + prng_state *prng, int wprng, dh_key *key) +{ + mp_int a, b, k, m, g, p, p1, tmp; + unsigned char *buf; + unsigned long x, y; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* check parameters */ + if (key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + /* is the IDX valid ? */ + if (is_valid_idx(key->idx) != 1) { + return CRYPT_PK_INVALID_TYPE; + } + + /* allocate ram for buf */ + buf = XMALLOC(520); + + /* make up a random value k, + * since the order of the group is prime + * we need not check if gcd(k, r) is 1 + */ + if (prng_descriptor[wprng].read(buf, sets[key->idx].size, prng) != + (unsigned long)(sets[key->idx].size)) { + err = CRYPT_ERROR_READPRNG; + goto LBL_ERR; + } + + /* init bignums */ + if ((err = mp_init_multi(&a, &b, &k, &m, &p, &g, &p1, &tmp, NULL)) != MP_OKAY) { + err = mpi_to_ltc_error(err); + goto LBL_ERR; + } + + /* load k and m */ + if ((err = mp_read_unsigned_bin(&m, (unsigned char *)in, inlen)) != MP_OKAY) { goto error; } + if ((err = mp_read_unsigned_bin(&k, buf, sets[key->idx].size)) != MP_OKAY) { goto error; } + + /* load g, p and p1 */ + if ((err = mp_read_radix(&g, sets[key->idx].base, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&p, sets[key->idx].prime, 64)) != MP_OKAY) { goto error; } + if ((err = mp_sub_d(&p, 1, &p1)) != MP_OKAY) { goto error; } + if ((err = mp_div_2(&p1, &p1)) != MP_OKAY) { goto error; } /* p1 = (p-1)/2 */ + + /* now get a = g^k mod p */ + if ((err = mp_exptmod(&g, &k, &p, &a)) != MP_OKAY) { goto error; } + + /* now find M = xa + kb mod p1 or just b = (M - xa)/k mod p1 */ + if ((err = mp_invmod(&k, &p1, &k)) != MP_OKAY) { goto error; } /* k = 1/k mod p1 */ + if ((err = mp_mulmod(&a, &key->x, &p1, &tmp)) != MP_OKAY) { goto error; } /* tmp = xa */ + if ((err = mp_submod(&m, &tmp, &p1, &tmp)) != MP_OKAY) { goto error; } /* tmp = M - xa */ + if ((err = mp_mulmod(&k, &tmp, &p1, &b)) != MP_OKAY) { goto error; } /* b = (M - xa)/k */ + + /* check for overflow */ + if ((unsigned long)(PACKET_SIZE + 4 + 4 + mp_unsigned_bin_size(&a) + mp_unsigned_bin_size(&b)) > *outlen) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* store header */ + y = PACKET_SIZE; + + /* now store them both (a,b) */ + x = (unsigned long)mp_unsigned_bin_size(&a); + STORE32L(x, out+y); y += 4; + if ((err = mp_to_unsigned_bin(&a, out+y)) != MP_OKAY) { goto error; } + y += x; + + x = (unsigned long)mp_unsigned_bin_size(&b); + STORE32L(x, out+y); y += 4; + if ((err = mp_to_unsigned_bin(&b, out+y)) != MP_OKAY) { goto error; } + y += x; + + /* check if size too big */ + if (*outlen < y) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* store header */ + packet_store_header(out, PACKET_SECT_DH, PACKET_SUB_SIGNED); + *outlen = y; + + err = CRYPT_OK; + goto LBL_ERR; +error: + err = mpi_to_ltc_error(err); +LBL_ERR: + mp_clear_multi(&tmp, &p1, &g, &p, &m, &k, &b, &a, NULL); + + XFREE(buf); + + return err; +} + + +/** + Verify the signature given + @param sig The signature + @param siglen The length of the signature (octets) + @param hash The hash that was signed + @param hashlen The length of the hash (octets) + @param stat [out] Result of signature comparison, 1==valid, 0==invalid + @param key The public DH key that signed the hash + @return CRYPT_OK if succsessful (even if signature is invalid) +*/ +int dh_verify_hash(const unsigned char *sig, unsigned long siglen, + const unsigned char *hash, unsigned long hashlen, + int *stat, dh_key *key) +{ + mp_int a, b, p, g, m, tmp; + unsigned long x, y; + int err; + + LTC_ARGCHK(sig != NULL); + LTC_ARGCHK(hash != NULL); + LTC_ARGCHK(stat != NULL); + LTC_ARGCHK(key != NULL); + + /* default to invalid */ + *stat = 0; + + /* check initial input length */ + if (siglen < PACKET_SIZE+4+4) { + return CRYPT_INVALID_PACKET; + } + + /* header ok? */ + if ((err = packet_valid_header((unsigned char *)sig, PACKET_SECT_DH, PACKET_SUB_SIGNED)) != CRYPT_OK) { + return err; + } + + /* get hash out of packet */ + y = PACKET_SIZE; + + /* init all bignums */ + if ((err = mp_init_multi(&a, &p, &b, &g, &m, &tmp, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + /* load a and b */ + INPUT_BIGNUM(&a, sig, x, y, siglen); + INPUT_BIGNUM(&b, sig, x, y, siglen); + + /* load p and g */ + if ((err = mp_read_radix(&p, sets[key->idx].prime, 64)) != MP_OKAY) { goto error1; } + if ((err = mp_read_radix(&g, sets[key->idx].base, 64)) != MP_OKAY) { goto error1; } + + /* load m */ + if ((err = mp_read_unsigned_bin(&m, (unsigned char *)hash, hashlen)) != MP_OKAY) { goto error1; } + + /* find g^m mod p */ + if ((err = mp_exptmod(&g, &m, &p, &m)) != MP_OKAY) { goto error1; } /* m = g^m mod p */ + + /* find y^a * a^b */ + if ((err = mp_exptmod(&key->y, &a, &p, &tmp)) != MP_OKAY) { goto error1; } /* tmp = y^a mod p */ + if ((err = mp_exptmod(&a, &b, &p, &a)) != MP_OKAY) { goto error1; } /* a = a^b mod p */ + if ((err = mp_mulmod(&a, &tmp, &p, &a)) != MP_OKAY) { goto error1; } /* a = y^a * a^b mod p */ + + /* y^a * a^b == g^m ??? */ + if (mp_cmp(&a, &m) == 0) { + *stat = 1; + } + + /* clean up */ + err = CRYPT_OK; + goto done; +error1: + err = mpi_to_ltc_error(err); +error: +done: + mp_clear_multi(&tmp, &m, &g, &p, &b, &a, NULL); + return err; +} + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dh/dh_sys.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/dsa/dsa_export.c b/libtomcrypt/src/pk/dsa/dsa_export.c new file mode 100644 index 0000000..5a093d9 --- /dev/null +++ b/libtomcrypt/src/pk/dsa/dsa_export.c @@ -0,0 +1,72 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dsa_export.c + DSA implementation, export key, Tom St Denis +*/ + +#ifdef MDSA + +/** + Export a DSA key to a binary packet + @param out [out] Where to store the packet + @param outlen [in/out] The max size and resulting size of the packet + @param type The type of key to export (PK_PRIVATE or PK_PUBLIC) + @param key The key to export + @return CRYPT_OK if successful +*/ +int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key) +{ + unsigned char flags[1]; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* can we store the static header? */ + if (type == PK_PRIVATE && key->type != PK_PRIVATE) { + return CRYPT_PK_TYPE_MISMATCH; + } + + if (type != PK_PUBLIC && type != PK_PRIVATE) { + return CRYPT_INVALID_ARG; + } + + flags[0] = (type != PK_PUBLIC) ? 1 : 0; + + if (type == PK_PRIVATE) { + return der_encode_sequence_multi(out, outlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_INTEGER, 1UL, &key->g, + LTC_ASN1_INTEGER, 1UL, &key->p, + LTC_ASN1_INTEGER, 1UL, &key->q, + LTC_ASN1_INTEGER, 1UL, &key->y, + LTC_ASN1_INTEGER, 1UL, &key->x, + LTC_ASN1_EOL, 0UL, NULL); + } else { + return der_encode_sequence_multi(out, outlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_INTEGER, 1UL, &key->g, + LTC_ASN1_INTEGER, 1UL, &key->p, + LTC_ASN1_INTEGER, 1UL, &key->q, + LTC_ASN1_INTEGER, 1UL, &key->y, + LTC_ASN1_EOL, 0UL, NULL); + } +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_export.c,v $ */ +/* $Revision: 1.6 $ */ +/* $Date: 2005/06/03 19:24:31 $ */ diff --git a/libtomcrypt/src/pk/dsa/dsa_free.c b/libtomcrypt/src/pk/dsa/dsa_free.c new file mode 100644 index 0000000..9157acb --- /dev/null +++ b/libtomcrypt/src/pk/dsa/dsa_free.c @@ -0,0 +1,34 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dsa_free.c + DSA implementation, free a DSA key, Tom St Denis +*/ + +#ifdef MDSA + +/** + Free a DSA key + @param key The key to free from memory +*/ +void dsa_free(dsa_key *key) +{ + LTC_ARGCHK(key != NULL); + mp_clear_multi(&key->g, &key->q, &key->p, &key->x, &key->y, NULL); +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_free.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/dsa/dsa_import.c b/libtomcrypt/src/pk/dsa/dsa_import.c new file mode 100644 index 0000000..e81bac8 --- /dev/null +++ b/libtomcrypt/src/pk/dsa/dsa_import.c @@ -0,0 +1,89 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dsa_import.c + DSA implementation, import a DSA key, Tom St Denis +*/ + +#ifdef MDSA + +/** + Import a DSA key + @param in The binary packet to import from + @param inlen The length of the binary packet + @param key [out] Where to store the imported key + @return CRYPT_OK if successful, upon error this function will free all allocated memory +*/ +int dsa_import(const unsigned char *in, unsigned long inlen, dsa_key *key) +{ + unsigned char flags[1]; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(key != NULL); + + /* init key */ + if (mp_init_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL) != MP_OKAY) { + return CRYPT_MEM; + } + + /* get key type */ + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto error; + } + + if (flags[0] == 1) { + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_INTEGER, 1UL, &key->g, + LTC_ASN1_INTEGER, 1UL, &key->p, + LTC_ASN1_INTEGER, 1UL, &key->q, + LTC_ASN1_INTEGER, 1UL, &key->y, + LTC_ASN1_INTEGER, 1UL, &key->x, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto error; + } + key->type = PK_PRIVATE; + } else { + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_INTEGER, 1UL, &key->g, + LTC_ASN1_INTEGER, 1UL, &key->p, + LTC_ASN1_INTEGER, 1UL, &key->q, + LTC_ASN1_INTEGER, 1UL, &key->y, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto error; + } + key->type = PK_PUBLIC; + } + key->qord = mp_unsigned_bin_size(&key->q); + + if (key->qord >= MDSA_MAX_GROUP || key->qord <= 15 || + key->qord >= mp_unsigned_bin_size(&key->p) || (mp_unsigned_bin_size(&key->p) - key->qord) >= MDSA_DELTA) { + err = CRYPT_INVALID_PACKET; + goto error; + } + + return CRYPT_OK; +error: + mp_clear_multi(&key->p, &key->g, &key->q, &key->x, &key->y, NULL); + return err; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_import.c,v $ */ +/* $Revision: 1.7 $ */ +/* $Date: 2005/06/08 23:31:17 $ */ diff --git a/libtomcrypt/src/pk/dsa/dsa_make_key.c b/libtomcrypt/src/pk/dsa/dsa_make_key.c new file mode 100644 index 0000000..02f69e0 --- /dev/null +++ b/libtomcrypt/src/pk/dsa/dsa_make_key.c @@ -0,0 +1,146 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dsa_make_key.c + DSA implementation, generate a DSA key, Tom St Denis +*/ + +#ifdef MDSA + +/** + Create a DSA key + @param prng An active PRNG state + @param wprng The index of the PRNG desired + @param group_size Size of the multiplicative group (octets) + @param modulus_size Size of the modulus (octets) + @param key [out] Where to store the created key + @return CRYPT_OK if successful, upon error this function will free all allocated memory +*/ +int dsa_make_key(prng_state *prng, int wprng, int group_size, int modulus_size, dsa_key *key) +{ + mp_int tmp, tmp2; + int err, res; + unsigned char *buf; + + LTC_ARGCHK(key != NULL); + + /* check prng */ + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + /* check size */ + if (group_size >= MDSA_MAX_GROUP || group_size <= 15 || + group_size >= modulus_size || (modulus_size - group_size) >= MDSA_DELTA) { + return CRYPT_INVALID_ARG; + } + + /* allocate ram */ + buf = XMALLOC(MDSA_DELTA); + if (buf == NULL) { + return CRYPT_MEM; + } + + /* init mp_ints */ + if ((err = mp_init_multi(&tmp, &tmp2, &key->g, &key->q, &key->p, &key->x, &key->y, NULL)) != MP_OKAY) { + err = mpi_to_ltc_error(err); + goto LBL_ERR; + } + + /* make our prime q */ + if ((err = rand_prime(&key->q, group_size*8, prng, wprng)) != CRYPT_OK) { goto LBL_ERR; } + + /* double q */ + if ((err = mp_mul_2(&key->q, &tmp)) != MP_OKAY) { goto error; } + + /* now make a random string and multply it against q */ + if (prng_descriptor[wprng].read(buf+1, modulus_size - group_size, prng) != (unsigned long)(modulus_size - group_size)) { + err = CRYPT_ERROR_READPRNG; + goto LBL_ERR; + } + + /* force magnitude */ + buf[0] |= 0xC0; + + /* force even */ + buf[modulus_size - group_size - 1] &= ~1; + + if ((err = mp_read_unsigned_bin(&tmp2, buf, modulus_size - group_size)) != MP_OKAY) { goto error; } + if ((err = mp_mul(&key->q, &tmp2, &key->p)) != MP_OKAY) { goto error; } + if ((err = mp_add_d(&key->p, 1, &key->p)) != MP_OKAY) { goto error; } + + /* now loop until p is prime */ + for (;;) { + if ((err = is_prime(&key->p, &res)) != CRYPT_OK) { goto LBL_ERR; } + if (res == MP_YES) break; + + /* add 2q to p and 2 to tmp2 */ + if ((err = mp_add(&tmp, &key->p, &key->p)) != MP_OKAY) { goto error; } + if ((err = mp_add_d(&tmp2, 2, &tmp2)) != MP_OKAY) { goto error; } + } + + /* now p = (q * tmp2) + 1 is prime, find a value g for which g^tmp2 != 1 */ + mp_set(&key->g, 1); + + do { + if ((err = mp_add_d(&key->g, 1, &key->g)) != MP_OKAY) { goto error; } + if ((err = mp_exptmod(&key->g, &tmp2, &key->p, &tmp)) != MP_OKAY) { goto error; } + } while (mp_cmp_d(&tmp, 1) == MP_EQ); + + /* at this point tmp generates a group of order q mod p */ + mp_exch(&tmp, &key->g); + + /* so now we have our DH structure, generator g, order q, modulus p + Now we need a random exponent [mod q] and it's power g^x mod p + */ + do { + if (prng_descriptor[wprng].read(buf, group_size, prng) != (unsigned long)group_size) { + err = CRYPT_ERROR_READPRNG; + goto LBL_ERR; + } + if ((err = mp_read_unsigned_bin(&key->x, buf, group_size)) != MP_OKAY) { goto error; } + } while (mp_cmp_d(&key->x, 1) != MP_GT); + if ((err = mp_exptmod(&key->g, &key->x, &key->p, &key->y)) != MP_OKAY) { goto error; } + + key->type = PK_PRIVATE; + key->qord = group_size; + + /* shrink the ram required */ + if ((err = mp_shrink(&key->g)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->p)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->q)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->x)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->y)) != MP_OKAY) { goto error; } + +#ifdef LTC_CLEAN_STACK + zeromem(buf, MDSA_DELTA); +#endif + + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +LBL_ERR: + mp_clear_multi(&key->g, &key->q, &key->p, &key->x, &key->y, NULL); +done: + mp_clear_multi(&tmp, &tmp2, NULL); + + XFREE(buf); + return err; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_make_key.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/06/11 05:45:35 $ */ diff --git a/libtomcrypt/src/pk/dsa/dsa_sign_hash.c b/libtomcrypt/src/pk/dsa/dsa_sign_hash.c new file mode 100644 index 0000000..48d29a2 --- /dev/null +++ b/libtomcrypt/src/pk/dsa/dsa_sign_hash.c @@ -0,0 +1,159 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dsa_sign_hash.c + DSA implementation, sign a hash, Tom St Denis +*/ + +#ifdef MDSA + +/** + Sign a hash with DSA + @param in The hash to sign + @param inlen The length of the hash to sign + @param r The "r" integer of the signature (caller must initialize with mp_init() first) + @param s The "s" integer of the signature (caller must initialize with mp_init() first) + @param prng An active PRNG state + @param wprng The index of the PRNG desired + @param key A private DSA key + @return CRYPT_OK if successful +*/ +int dsa_sign_hash_raw(const unsigned char *in, unsigned long inlen, + mp_int *r, mp_int *s, + prng_state *prng, int wprng, dsa_key *key) +{ + mp_int k, kinv, tmp; + unsigned char *buf; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(r != NULL); + LTC_ARGCHK(s != NULL); + LTC_ARGCHK(key != NULL); + + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + if (key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + /* check group order size */ + if (key->qord >= MDSA_MAX_GROUP) { + return CRYPT_INVALID_ARG; + } + + buf = XMALLOC(MDSA_MAX_GROUP); + if (buf == NULL) { + return CRYPT_MEM; + } + + /* Init our temps */ + if ((err = mp_init_multi(&k, &kinv, &tmp, NULL)) != MP_OKAY) { goto error; } + +retry: + + do { + /* gen random k */ + if (prng_descriptor[wprng].read(buf, key->qord, prng) != (unsigned long)key->qord) { + err = CRYPT_ERROR_READPRNG; + goto LBL_ERR; + } + + /* read k */ + if ((err = mp_read_unsigned_bin(&k, buf, key->qord)) != MP_OKAY) { goto error; } + + /* k > 1 ? */ + if (mp_cmp_d(&k, 1) != MP_GT) { goto retry; } + + /* test gcd */ + if ((err = mp_gcd(&k, &key->q, &tmp)) != MP_OKAY) { goto error; } + } while (mp_cmp_d(&tmp, 1) != MP_EQ); + + /* now find 1/k mod q */ + if ((err = mp_invmod(&k, &key->q, &kinv)) != MP_OKAY) { goto error; } + + /* now find r = g^k mod p mod q */ + if ((err = mp_exptmod(&key->g, &k, &key->p, r)) != MP_OKAY) { goto error; } + if ((err = mp_mod(r, &key->q, r)) != MP_OKAY) { goto error; } + + if (mp_iszero(r) == MP_YES) { goto retry; } + + /* now find s = (in + xr)/k mod q */ + if ((err = mp_read_unsigned_bin(&tmp, (unsigned char *)in, inlen)) != MP_OKAY) { goto error; } + if ((err = mp_mul(&key->x, r, s)) != MP_OKAY) { goto error; } + if ((err = mp_add(s, &tmp, s)) != MP_OKAY) { goto error; } + if ((err = mp_mulmod(s, &kinv, &key->q, s)) != MP_OKAY) { goto error; } + + if (mp_iszero(s) == MP_YES) { goto retry; } + + err = CRYPT_OK; + goto LBL_ERR; + +error: + err = mpi_to_ltc_error(err); +LBL_ERR: + mp_clear_multi(&k, &kinv, &tmp, NULL); +#ifdef LTC_CLEAN_STACK + zeromem(buf, MDSA_MAX_GROUP); +#endif + XFREE(buf); + return err; +} + +/** + Sign a hash with DSA + @param in The hash to sign + @param inlen The length of the hash to sign + @param out [out] Where to store the signature + @param outlen [in/out] The max size and resulting size of the signature + @param prng An active PRNG state + @param wprng The index of the PRNG desired + @param key A private DSA key + @return CRYPT_OK if successful +*/ +int dsa_sign_hash(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + prng_state *prng, int wprng, dsa_key *key) +{ + mp_int r, s; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + if (mp_init_multi(&r, &s, NULL) != MP_OKAY) { + return CRYPT_MEM; + } + + if ((err = dsa_sign_hash_raw(in, inlen, &r, &s, prng, wprng, key)) != CRYPT_OK) { + goto LBL_ERR; + } + + err = der_encode_sequence_multi(out, outlen, + LTC_ASN1_INTEGER, 1UL, &r, + LTC_ASN1_INTEGER, 1UL, &s, + LTC_ASN1_EOL, 0UL, NULL); + +LBL_ERR: + mp_clear_multi(&r, &s, NULL); + return err; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_sign_hash.c,v $ */ +/* $Revision: 1.6 $ */ +/* $Date: 2005/05/15 21:48:59 $ */ diff --git a/libtomcrypt/src/pk/dsa/dsa_verify_hash.c b/libtomcrypt/src/pk/dsa/dsa_verify_hash.c new file mode 100644 index 0000000..11e5c33 --- /dev/null +++ b/libtomcrypt/src/pk/dsa/dsa_verify_hash.c @@ -0,0 +1,128 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dsa_verify_hash.c + DSA implementation, verify a signature, Tom St Denis +*/ + + +#ifdef MDSA + +/** + Verify a DSA signature + @param r DSA "r" parameter + @param s DSA "s" parameter + @param hash The hash that was signed + @param hashlen The length of the hash that was signed + @param stat [out] The result of the signature verification, 1==valid, 0==invalid + @param key The corresponding public DH key + @return CRYPT_OK if successful (even if the signature is invalid) +*/ +int dsa_verify_hash_raw( mp_int *r, mp_int *s, + const unsigned char *hash, unsigned long hashlen, + int *stat, dsa_key *key) +{ + mp_int w, v, u1, u2; + int err; + + LTC_ARGCHK(r != NULL); + LTC_ARGCHK(s != NULL); + LTC_ARGCHK(stat != NULL); + LTC_ARGCHK(key != NULL); + + /* default to invalid signature */ + *stat = 0; + + /* init our variables */ + if ((err = mp_init_multi(&w, &v, &u1, &u2, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + /* neither r or s can be null or >q*/ + if (mp_iszero(r) == MP_YES || mp_iszero(s) == MP_YES || mp_cmp(r, &key->q) != MP_LT || mp_cmp(s, &key->q) != MP_LT) { + err = CRYPT_INVALID_PACKET; + goto done; + } + + /* w = 1/s mod q */ + if ((err = mp_invmod(s, &key->q, &w)) != MP_OKAY) { goto error; } + + /* u1 = m * w mod q */ + if ((err = mp_read_unsigned_bin(&u1, (unsigned char *)hash, hashlen)) != MP_OKAY) { goto error; } + if ((err = mp_mulmod(&u1, &w, &key->q, &u1)) != MP_OKAY) { goto error; } + + /* u2 = r*w mod q */ + if ((err = mp_mulmod(r, &w, &key->q, &u2)) != MP_OKAY) { goto error; } + + /* v = g^u1 * y^u2 mod p mod q */ + if ((err = mp_exptmod(&key->g, &u1, &key->p, &u1)) != MP_OKAY) { goto error; } + if ((err = mp_exptmod(&key->y, &u2, &key->p, &u2)) != MP_OKAY) { goto error; } + if ((err = mp_mulmod(&u1, &u2, &key->p, &v)) != MP_OKAY) { goto error; } + if ((err = mp_mod(&v, &key->q, &v)) != MP_OKAY) { goto error; } + + /* if r = v then we're set */ + if (mp_cmp(r, &v) == MP_EQ) { + *stat = 1; + } + + err = CRYPT_OK; + goto done; + +error : err = mpi_to_ltc_error(err); +done : mp_clear_multi(&w, &v, &u1, &u2, NULL); + return err; +} + +/** + Verify a DSA signature + @param sig The signature + @param siglen The length of the signature (octets) + @param hash The hash that was signed + @param hashlen The length of the hash that was signed + @param stat [out] The result of the signature verification, 1==valid, 0==invalid + @param key The corresponding public DH key + @return CRYPT_OK if successful (even if the signature is invalid) +*/ +int dsa_verify_hash(const unsigned char *sig, unsigned long siglen, + const unsigned char *hash, unsigned long hashlen, + int *stat, dsa_key *key) +{ + int err; + mp_int r, s; + + if ((err = mp_init_multi(&r, &s, NULL)) != CRYPT_OK) { + return CRYPT_MEM; + } + + /* decode the sequence */ + if ((err = der_decode_sequence_multi(sig, siglen, + LTC_ASN1_INTEGER, 1UL, &r, + LTC_ASN1_INTEGER, 1UL, &s, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* do the op */ + err = dsa_verify_hash_raw(&r, &s, hash, hashlen, stat, key); + +LBL_ERR: + mp_clear_multi(&r, &s, NULL); + return err; +} + +#endif + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_verify_hash.c,v $ */ +/* $Revision: 1.8 $ */ +/* $Date: 2005/05/15 21:48:59 $ */ diff --git a/libtomcrypt/src/pk/dsa/dsa_verify_key.c b/libtomcrypt/src/pk/dsa/dsa_verify_key.c new file mode 100644 index 0000000..b7be103 --- /dev/null +++ b/libtomcrypt/src/pk/dsa/dsa_verify_key.c @@ -0,0 +1,102 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file dsa_verify_key.c + DSA implementation, verify a key, Tom St Denis +*/ + +#ifdef MDSA + +/** + Verify a DSA key for validity + @param key The key to verify + @param stat [out] Result of test, 1==valid, 0==invalid + @return CRYPT_OK if successful +*/ +int dsa_verify_key(dsa_key *key, int *stat) +{ + mp_int tmp, tmp2; + int res, err; + + LTC_ARGCHK(key != NULL); + LTC_ARGCHK(stat != NULL); + + /* default to an invalid key */ + *stat = 0; + + /* first make sure key->q and key->p are prime */ + if ((err = is_prime(&key->q, &res)) != CRYPT_OK) { + return err; + } + if (res == 0) { + return CRYPT_OK; + } + + + if ((err = is_prime(&key->p, &res)) != CRYPT_OK) { + return err; + } + if (res == 0) { + return CRYPT_OK; + } + + /* now make sure that g is not -1, 0 or 1 and <p */ + if (mp_cmp_d(&key->g, 0) == MP_EQ || mp_cmp_d(&key->g, 1) == MP_EQ) { + return CRYPT_OK; + } + if ((err = mp_init_multi(&tmp, &tmp2, NULL)) != MP_OKAY) { goto error; } + if ((err = mp_sub_d(&key->p, 1, &tmp)) != MP_OKAY) { goto error; } + if (mp_cmp(&tmp, &key->g) == MP_EQ || mp_cmp(&key->g, &key->p) != MP_LT) { + err = CRYPT_OK; + goto done; + } + + /* 1 < y < p-1 */ + if (!(mp_cmp_d(&key->y, 1) == MP_GT && mp_cmp(&key->y, &tmp) == MP_LT)) { + err = CRYPT_OK; + goto done; + } + + /* now we have to make sure that g^q = 1, and that p-1/q gives 0 remainder */ + if ((err = mp_div(&tmp, &key->q, &tmp, &tmp2)) != MP_OKAY) { goto error; } + if (mp_iszero(&tmp2) != MP_YES) { + err = CRYPT_OK; + goto done; + } + + if ((err = mp_exptmod(&key->g, &key->q, &key->p, &tmp)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&tmp, 1) != MP_EQ) { + err = CRYPT_OK; + goto done; + } + + /* now we have to make sure that y^q = 1, this makes sure y \in g^x mod p */ + if ((err = mp_exptmod(&key->y, &key->q, &key->p, &tmp)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&tmp, 1) != MP_EQ) { + err = CRYPT_OK; + goto done; + } + + /* at this point we are out of tests ;-( */ + err = CRYPT_OK; + *stat = 1; + goto done; +error: err = mpi_to_ltc_error(err); +done : mp_clear_multi(&tmp, &tmp2, NULL); + return err; +} +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_verify_key.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/ecc/ecc.c b/libtomcrypt/src/pk/ecc/ecc.c new file mode 100644 index 0000000..469d56d --- /dev/null +++ b/libtomcrypt/src/pk/ecc/ecc.c @@ -0,0 +1,1036 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ + +/* Implements ECC over Z/pZ for curve y^2 = x^3 - 3x + b + * + * All curves taken from NIST recommendation paper of July 1999 + * Available at http://csrc.nist.gov/cryptval/dss.htm + */ +#include "tomcrypt.h" + +/** + @file ecc.c + ECC Crypto, Tom St Denis +*/ + +#ifdef MECC + +/* size of our temp buffers for exported keys */ +#define ECC_BUF_SIZE 256 + +/* max private key size */ +#define ECC_MAXSIZE 66 + +/* This holds the key settings. ***MUST*** be organized by size from smallest to largest. */ +static const struct { + int size; + char *name, *prime, *B, *order, *Gx, *Gy; +} sets[] = { +#ifdef ECC192 +{ + 24, + "ECC-192", + /* prime */ + "/////////////////////l//////////", + + /* B */ + "P2456UMSWESFf+chSYGmIVwutkp1Hhcn", + + /* order */ + "////////////////cTxuDXHhoR6qqYWn", + + /* Gx */ + "68se3h0maFPylo3hGw680FJ/2ls2/n0I", + + /* Gy */ + "1nahbV/8sdXZ417jQoJDrNFvTw4UUKWH" +}, +#endif +#ifdef ECC224 +{ + 28, + "ECC-224", + + /* prime */ + "3/////////////////////0000000000000001", + + /* B */ + "2q1Gg530Ipg/L1CbPGHB2trx/OkYSBEKCZLV+q", + + /* order */ + "3//////////////////nQYuBZmFXFTAKLSN2ez", + + /* Gx */ + "2t3WozQxI/Vp8JaBbA0y7JLi8H8ZGoWDOHN1qX", + + + /* Gy */ + "2zDsE8jVSZ+qmYt+RDGtMWMWT7P4JLWPc507uq", +}, +#endif +#ifdef ECC256 +{ + 32, + "ECC-256", + /* Prime */ + "F////y000010000000000000000////////////////", + + /* B */ + "5h6DTYgEfFdi+kzLNQOXhnb7GQmp5EmzZlEF3udqc1B", + + /* Order */ + "F////y00000//////////+yvlgjfnUUXFEvoiByOoLH", + + /* Gx */ + "6iNqVBXB497+BpcvMEaGF9t0ts1BUipeFIXEKNOcCAM", + + /* Gy */ + "4/ZGkB+6d+RZkVhIdmFdXOhpZDNQp5UpiksG6Wtlr7r" +}, +#endif +#ifdef ECC384 +{ + 48, + "ECC-384", + /* prime */ + "//////////////////////////////////////////x/////00000000003/" + "////", + + /* B */ + "ip4lf+8+v+IOZWLhu/Wj6HWTd6x+WK4I0nG8Zr0JXrh6LZcDYYxHdIg5oEtJ" + "x2hl", + + /* Order */ + "////////////////////////////////nsDDWVGtBTzO6WsoIB2dUkpi6MhC" + "nIbp", + + /* Gx and Gy */ + "geVA8hwB1JUEiSSUyo2jT6uTEsABfvkOMVT1u89KAZXL0l9TlrKfR3fKNZXo" + "TWgt", + + "DXVUIfOcB6zTdfY/afBSAVZq7RqecXHywTen4xNmkC0AOB7E7Nw1dNf37NoG" + "wWvV" +}, +#endif +#ifdef ECC521 +{ + 65, + "ECC-521", + /* prime */ + "V///////////////////////////////////////////////////////////" + "///////////////////////////", + + /* B */ + "56LFhbXZXoQ7vAQ8Q2sXK3kejfoMvcp5VEuj8cHZl49uLOPEL7iVfDx5bB0l" + "JknlmSrSz+8FImqyUz57zHhK3y0", + + /* Order */ + "V//////////////////////////////////////////+b66XuE/BvPhVym1I" + "FS9fT0xjScuYPn7hhjljnwHE6G9", + + /* Gx and Gy */ + "CQ5ZWQt10JfpPu+osOZbRH2d6I1EGK/jI7uAAzWQqqzkg5BNdVlvrae/Xt19" + "wB/gDupIBF1XMf2c/b+VZ72vRrc", + + "HWvAMfucZl015oANxGiVHlPcFL4ILURH6WNhxqN9pvcB9VkSfbUz2P0nL2v0" + "J+j1s4rF726edB2G8Y+b7QVqMPG", +}, +#endif +{ + 0, + NULL, NULL, NULL, NULL, NULL, NULL +} +}; + +static int is_valid_idx(int n) +{ + int x; + + for (x = 0; sets[x].size != 0; x++); + if ((n < 0) || (n >= x)) { + return 0; + } + return 1; +} + +static ecc_point *new_point(void) +{ + ecc_point *p; + p = XMALLOC(sizeof(ecc_point)); + if (p == NULL) { + return NULL; + } + if (mp_init_multi(&p->x, &p->y, &p->z, NULL) != MP_OKAY) { + XFREE(p); + return NULL; + } + return p; +} + +static void del_point(ecc_point *p) +{ + /* prevents free'ing null arguments */ + if (p != NULL) { + mp_clear_multi(&p->x, &p->y, &p->z, NULL); + XFREE(p); + } +} + +static int ecc_map(ecc_point *P, mp_int *modulus, mp_digit mp) +{ + mp_int t1, t2; + int err; + + if ((err = mp_init_multi(&t1, &t2, NULL)) != CRYPT_OK) { + return CRYPT_MEM; + } + + /* first map z back to normal */ + if ((err = mp_montgomery_reduce(&P->z, modulus, mp)) != MP_OKAY) { goto error; } + + /* get 1/z */ + if ((err = mp_invmod(&P->z, modulus, &t1)) != MP_OKAY) { goto error; } + + /* get 1/z^2 and 1/z^3 */ + if ((err = mp_sqr(&t1, &t2)) != MP_OKAY) { goto error; } + if ((err = mp_mod(&t2, modulus, &t2)) != MP_OKAY) { goto error; } + if ((err = mp_mul(&t1, &t2, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_mod(&t1, modulus, &t1)) != MP_OKAY) { goto error; } + + /* multiply against x/y */ + if ((err = mp_mul(&P->x, &t2, &P->x)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&P->x, modulus, mp)) != MP_OKAY) { goto error; } + if ((err = mp_mul(&P->y, &t1, &P->y)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&P->y, modulus, mp)) != MP_OKAY) { goto error; } + mp_set(&P->z, 1); + + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + mp_clear_multi(&t1, &t2, NULL); + return err; + +} + +/* double a point R = 2P, R can be P*/ +static int dbl_point(ecc_point *P, ecc_point *R, mp_int *modulus, mp_digit mp) +{ + mp_int t1, t2; + int err; + + if ((err = mp_init_multi(&t1, &t2, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + if ((err = mp_copy(&P->x, &R->x)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&P->y, &R->y)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&P->z, &R->z)) != MP_OKAY) { goto error; } + + /* t1 = Z * Z */ + if ((err = mp_sqr(&R->z, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + /* Z = Y * Z */ + if ((err = mp_mul(&R->z, &R->y, &R->z)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&R->z, modulus, mp)) != MP_OKAY) { goto error; } + /* Z = 2Z */ + if ((err = mp_mul_2(&R->z, &R->z)) != MP_OKAY) { goto error; } + if (mp_cmp(&R->z, modulus) != MP_LT) { + if ((err = mp_sub(&R->z, modulus, &R->z)) != MP_OKAY) { goto error; } + } + + /* T2 = X - T1 */ + if ((err = mp_sub(&R->x, &t1, &t2)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&t2, 0) == MP_LT) { + if ((err = mp_add(&t2, modulus, &t2)) != MP_OKAY) { goto error; } + } + /* T1 = X + T1 */ + if ((err = mp_add(&t1, &R->x, &t1)) != MP_OKAY) { goto error; } + if (mp_cmp(&t1, modulus) != MP_LT) { + if ((err = mp_sub(&t1, modulus, &t1)) != MP_OKAY) { goto error; } + } + /* T2 = T1 * T2 */ + if ((err = mp_mul(&t1, &t2, &t2)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t2, modulus, mp)) != MP_OKAY) { goto error; } + /* T1 = 2T2 */ + if ((err = mp_mul_2(&t2, &t1)) != MP_OKAY) { goto error; } + if (mp_cmp(&t1, modulus) != MP_LT) { + if ((err = mp_sub(&t1, modulus, &t1)) != MP_OKAY) { goto error; } + } + /* T1 = T1 + T2 */ + if ((err = mp_add(&t1, &t2, &t1)) != MP_OKAY) { goto error; } + if (mp_cmp(&t1, modulus) != MP_LT) { + if ((err = mp_sub(&t1, modulus, &t1)) != MP_OKAY) { goto error; } + } + + /* Y = 2Y */ + if ((err = mp_mul_2(&R->y, &R->y)) != MP_OKAY) { goto error; } + if (mp_cmp(&R->y, modulus) != MP_LT) { + if ((err = mp_sub(&R->y, modulus, &R->y)) != MP_OKAY) { goto error; } + } + /* Y = Y * Y */ + if ((err = mp_sqr(&R->y, &R->y)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&R->y, modulus, mp)) != MP_OKAY) { goto error; } + /* T2 = Y * Y */ + if ((err = mp_sqr(&R->y, &t2)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t2, modulus, mp)) != MP_OKAY) { goto error; } + /* T2 = T2/2 */ + if (mp_isodd(&t2)) { + if ((err = mp_add(&t2, modulus, &t2)) != MP_OKAY) { goto error; } + } + if ((err = mp_div_2(&t2, &t2)) != MP_OKAY) { goto error; } + /* Y = Y * X */ + if ((err = mp_mul(&R->y, &R->x, &R->y)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&R->y, modulus, mp)) != MP_OKAY) { goto error; } + + /* X = T1 * T1 */ + if ((err = mp_sqr(&t1, &R->x)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&R->x, modulus, mp)) != MP_OKAY) { goto error; } + /* X = X - Y */ + if ((err = mp_sub(&R->x, &R->y, &R->x)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&R->x, 0) == MP_LT) { + if ((err = mp_add(&R->x, modulus, &R->x)) != MP_OKAY) { goto error; } + } + /* X = X - Y */ + if ((err = mp_sub(&R->x, &R->y, &R->x)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&R->x, 0) == MP_LT) { + if ((err = mp_add(&R->x, modulus, &R->x)) != MP_OKAY) { goto error; } + } + + /* Y = Y - X */ + if ((err = mp_sub(&R->y, &R->x, &R->y)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&R->y, 0) == MP_LT) { + if ((err = mp_add(&R->y, modulus, &R->y)) != MP_OKAY) { goto error; } + } + /* Y = Y * T1 */ + if ((err = mp_mul(&R->y, &t1, &R->y)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&R->y, modulus, mp)) != MP_OKAY) { goto error; } + /* Y = Y - T2 */ + if ((err = mp_sub(&R->y, &t2, &R->y)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&R->y, 0) == MP_LT) { + if ((err = mp_add(&R->y, modulus, &R->y)) != MP_OKAY) { goto error; } + } + + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + mp_clear_multi(&t1, &t2, NULL); + return err; +} + +/* add two different points over Z/pZ, R = P + Q, note R can equal either P or Q */ +static int add_point(ecc_point *P, ecc_point *Q, ecc_point *R, mp_int *modulus, mp_digit mp) +{ + mp_int t1, t2, x, y, z; + int err; + + if ((err = mp_init_multi(&t1, &t2, &x, &y, &z, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + if ((err = mp_copy(&P->x, &x)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&P->y, &y)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&P->z, &z)) != MP_OKAY) { goto error; } + + /* T1 = Z' * Z' */ + if ((err = mp_sqr(&Q->z, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + /* X = X * T1 */ + if ((err = mp_mul(&t1, &x, &x)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&x, modulus, mp)) != MP_OKAY) { goto error; } + /* T1 = Z' * T1 */ + if ((err = mp_mul(&Q->z, &t1, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + /* Y = Y * T1 */ + if ((err = mp_mul(&t1, &y, &y)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&y, modulus, mp)) != MP_OKAY) { goto error; } + + /* T1 = Z*Z */ + if ((err = mp_sqr(&z, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + /* T2 = X' * T1 */ + if ((err = mp_mul(&Q->x, &t1, &t2)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t2, modulus, mp)) != MP_OKAY) { goto error; } + /* T1 = Z * T1 */ + if ((err = mp_mul(&z, &t1, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + /* T1 = Y' * T1 */ + if ((err = mp_mul(&Q->y, &t1, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + + /* Y = Y - T1 */ + if ((err = mp_sub(&y, &t1, &y)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&y, 0) == MP_LT) { + if ((err = mp_add(&y, modulus, &y)) != MP_OKAY) { goto error; } + } + /* T1 = 2T1 */ + if ((err = mp_mul_2(&t1, &t1)) != MP_OKAY) { goto error; } + if (mp_cmp(&t1, modulus) != MP_LT) { + if ((err = mp_sub(&t1, modulus, &t1)) != MP_OKAY) { goto error; } + } + /* T1 = Y + T1 */ + if ((err = mp_add(&t1, &y, &t1)) != MP_OKAY) { goto error; } + if (mp_cmp(&t1, modulus) != MP_LT) { + if ((err = mp_sub(&t1, modulus, &t1)) != MP_OKAY) { goto error; } + } + /* X = X - T2 */ + if ((err = mp_sub(&x, &t2, &x)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&x, 0) == MP_LT) { + if ((err = mp_add(&x, modulus, &x)) != MP_OKAY) { goto error; } + } + /* T2 = 2T2 */ + if ((err = mp_mul_2(&t2, &t2)) != MP_OKAY) { goto error; } + if (mp_cmp(&t2, modulus) != MP_LT) { + if ((err = mp_sub(&t2, modulus, &t2)) != MP_OKAY) { goto error; } + } + /* T2 = X + T2 */ + if ((err = mp_add(&t2, &x, &t2)) != MP_OKAY) { goto error; } + if (mp_cmp(&t2, modulus) != MP_LT) { + if ((err = mp_sub(&t2, modulus, &t2)) != MP_OKAY) { goto error; } + } + + /* if Z' != 1 */ + if (mp_cmp_d(&Q->z, 1) != MP_EQ) { + /* Z = Z * Z' */ + if ((err = mp_mul(&z, &Q->z, &z)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&z, modulus, mp)) != MP_OKAY) { goto error; } + } + /* Z = Z * X */ + if ((err = mp_mul(&z, &x, &z)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&z, modulus, mp)) != MP_OKAY) { goto error; } + + /* T1 = T1 * X */ + if ((err = mp_mul(&t1, &x, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + /* X = X * X */ + if ((err = mp_sqr(&x, &x)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&x, modulus, mp)) != MP_OKAY) { goto error; } + /* T2 = T2 * x */ + if ((err = mp_mul(&t2, &x, &t2)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t2, modulus, mp)) != MP_OKAY) { goto error; } + /* T1 = T1 * X */ + if ((err = mp_mul(&t1, &x, &t1)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t1, modulus, mp)) != MP_OKAY) { goto error; } + + /* X = Y*Y */ + if ((err = mp_sqr(&y, &x)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&x, modulus, mp)) != MP_OKAY) { goto error; } + /* X = X - T2 */ + if ((err = mp_sub(&x, &t2, &x)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&x, 0) == MP_LT) { + if ((err = mp_add(&x, modulus, &x)) != MP_OKAY) { goto error; } + } + + /* T2 = T2 - X */ + if ((err = mp_sub(&t2, &x, &t2)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&t2, 0) == MP_LT) { + if ((err = mp_add(&t2, modulus, &t2)) != MP_OKAY) { goto error; } + } + /* T2 = T2 - X */ + if ((err = mp_sub(&t2, &x, &t2)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&t2, 0) == MP_LT) { + if ((err = mp_add(&t2, modulus, &t2)) != MP_OKAY) { goto error; } + } + /* T2 = T2 * Y */ + if ((err = mp_mul(&t2, &y, &t2)) != MP_OKAY) { goto error; } + if ((err = mp_montgomery_reduce(&t2, modulus, mp)) != MP_OKAY) { goto error; } + /* Y = T2 - T1 */ + if ((err = mp_sub(&t2, &t1, &y)) != MP_OKAY) { goto error; } + if (mp_cmp_d(&y, 0) == MP_LT) { + if ((err = mp_add(&y, modulus, &y)) != MP_OKAY) { goto error; } + } + /* Y = Y/2 */ + if (mp_isodd(&y)) { + if ((err = mp_add(&y, modulus, &y)) != MP_OKAY) { goto error; } + } + if ((err = mp_div_2(&y, &y)) != MP_OKAY) { goto error; } + + if ((err = mp_copy(&x, &R->x)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&y, &R->y)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&z, &R->z)) != MP_OKAY) { goto error; } + + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + mp_clear_multi(&t1, &t2, &x, &y, &z, NULL); + return err; +} + +/* size of sliding window, don't change this! */ +#define WINSIZE 4 + +/* perform R = kG where k == integer and G == ecc_point */ +static int ecc_mulmod(mp_int *k, ecc_point *G, ecc_point *R, mp_int *modulus, int map) +{ + ecc_point *tG, *M[8]; + int i, j, err; + mp_int mu; + mp_digit buf, mp; + int first, bitbuf, bitcpy, bitcnt, mode, digidx; + + /* init montgomery reduction */ + if ((err = mp_montgomery_setup(modulus, &mp)) != MP_OKAY) { + return CRYPT_INVALID_ARG; + } + if ((err = mp_init(&mu)) != MP_OKAY) { + return CRYPT_MEM; + } + if ((err = mp_montgomery_calc_normalization(&mu, modulus)) != MP_OKAY) { + mp_clear(&mu); + return CRYPT_INVALID_ARG; + } + + /* alloc ram for window temps */ + for (i = 0; i < 8; i++) { + M[i] = new_point(); + if (M[i] == NULL) { + for (j = 0; j < i; j++) { + del_point(M[j]); + } + mp_clear(&mu); + return CRYPT_MEM; + } + } + + /* make a copy of G incase R==G */ + tG = new_point(); + if (tG == NULL) { err = CRYPT_MEM; goto done; } + + /* tG = G and convert to montgomery */ + if ((err = mp_mulmod(&G->x, &mu, modulus, &tG->x)) != MP_OKAY) { goto error; } + if ((err = mp_mulmod(&G->y, &mu, modulus, &tG->y)) != MP_OKAY) { goto error; } + if ((err = mp_mulmod(&G->z, &mu, modulus, &tG->z)) != MP_OKAY) { goto error; } + mp_clear(&mu); + + /* calc the M tab, which holds kG for k==8..15 */ + /* M[0] == 8G */ + if ((err = dbl_point(tG, M[0], modulus, mp)) != CRYPT_OK) { goto done; } + if ((err = dbl_point(M[0], M[0], modulus, mp)) != CRYPT_OK) { goto done; } + if ((err = dbl_point(M[0], M[0], modulus, mp)) != CRYPT_OK) { goto done; } + + /* now find (8+k)G for k=1..7 */ + for (j = 9; j < 16; j++) { + if ((err = add_point(M[j-9], tG, M[j-8], modulus, mp)) != CRYPT_OK) { goto done; } + } + + /* setup sliding window */ + mode = 0; + bitcnt = 1; + buf = 0; + digidx = k->used - 1; + bitcpy = bitbuf = 0; + first = 1; + + /* perform ops */ + for (;;) { + /* grab next digit as required */ + if (--bitcnt == 0) { + if (digidx == -1) { + break; + } + buf = k->dp[digidx--]; + bitcnt = (int) DIGIT_BIT; + } + + /* grab the next msb from the ltiplicand */ + i = (buf >> (DIGIT_BIT - 1)) & 1; + buf <<= 1; + + /* skip leading zero bits */ + if (mode == 0 && i == 0) { + continue; + } + + /* if the bit is zero and mode == 1 then we double */ + if (mode == 1 && i == 0) { + if ((err = dbl_point(R, R, modulus, mp)) != CRYPT_OK) { goto done; } + continue; + } + + /* else we add it to the window */ + bitbuf |= (i << (WINSIZE - ++bitcpy)); + mode = 2; + + if (bitcpy == WINSIZE) { + /* if this is the first window we do a simple copy */ + if (first == 1) { + /* R = kG [k = first window] */ + if ((err = mp_copy(&M[bitbuf-8]->x, &R->x)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&M[bitbuf-8]->y, &R->y)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&M[bitbuf-8]->z, &R->z)) != MP_OKAY) { goto error; } + first = 0; + } else { + /* normal window */ + /* ok window is filled so double as required and add */ + /* double first */ + for (j = 0; j < WINSIZE; j++) { + if ((err = dbl_point(R, R, modulus, mp)) != CRYPT_OK) { goto done; } + } + + /* then add, bitbuf will be 8..15 [8..2^WINSIZE] guaranteed */ + if ((err = add_point(R, M[bitbuf-8], R, modulus, mp)) != CRYPT_OK) { goto done; } + } + /* empty window and reset */ + bitcpy = bitbuf = 0; + mode = 1; + } + } + + /* if bits remain then double/add */ + if (mode == 2 && bitcpy > 0) { + /* double then add */ + for (j = 0; j < bitcpy; j++) { + /* only double if we have had at least one add first */ + if (first == 0) { + if ((err = dbl_point(R, R, modulus, mp)) != CRYPT_OK) { goto done; } + } + + bitbuf <<= 1; + if ((bitbuf & (1 << WINSIZE)) != 0) { + if (first == 1){ + /* first add, so copy */ + if ((err = mp_copy(&tG->x, &R->x)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&tG->y, &R->y)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&tG->z, &R->z)) != MP_OKAY) { goto error; } + first = 0; + } else { + /* then add */ + if ((err = add_point(R, tG, R, modulus, mp)) != CRYPT_OK) { goto done; } + } + } + } + } + + /* map R back from projective space */ + if (map) { + err = ecc_map(R, modulus, mp); + } else { + err = CRYPT_OK; + } + + goto done; +error: + err = mpi_to_ltc_error(err); +done: + del_point(tG); + for (i = 0; i < 8; i++) { + del_point(M[i]); + } + return err; +} + +#undef WINSIZE + +/** + Perform on the ECC system + @return CRYPT_OK if successful +*/ +int ecc_test(void) +{ + mp_int modulus, order; + ecc_point *G, *GG; + int i, err, primality; + + if ((err = mp_init_multi(&modulus, &order, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + G = new_point(); + GG = new_point(); + if (G == NULL || GG == NULL) { + mp_clear_multi(&modulus, &order, NULL); + del_point(G); + del_point(GG); + return CRYPT_MEM; + } + + for (i = 0; sets[i].size; i++) { + #if 0 + printf("Testing %d\n", sets[i].size); + #endif + if ((err = mp_read_radix(&modulus, (char *)sets[i].prime, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&order, (char *)sets[i].order, 64)) != MP_OKAY) { goto error; } + + /* is prime actually prime? */ + if ((err = is_prime(&modulus, &primality)) != CRYPT_OK) { goto done; } + if (primality == 0) { + err = CRYPT_FAIL_TESTVECTOR; + goto done; + } + + /* is order prime ? */ + if ((err = is_prime(&order, &primality)) != CRYPT_OK) { goto done; } + if (primality == 0) { + err = CRYPT_FAIL_TESTVECTOR; + goto done; + } + + if ((err = mp_read_radix(&G->x, (char *)sets[i].Gx, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&G->y, (char *)sets[i].Gy, 64)) != MP_OKAY) { goto error; } + mp_set(&G->z, 1); + + /* then we should have G == (order + 1)G */ + if ((err = mp_add_d(&order, 1, &order)) != MP_OKAY) { goto error; } + if ((err = ecc_mulmod(&order, G, GG, &modulus, 1)) != CRYPT_OK) { goto done; } + if (mp_cmp(&G->x, &GG->x) != 0 || mp_cmp(&G->y, &GG->y) != 0) { + err = CRYPT_FAIL_TESTVECTOR; + goto done; + } + } + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + del_point(GG); + del_point(G); + mp_clear_multi(&order, &modulus, NULL); + return err; +} + +void ecc_sizes(int *low, int *high) +{ + int i; + LTC_ARGCHK(low != NULL); + LTC_ARGCHK(high != NULL); + + *low = INT_MAX; + *high = 0; + for (i = 0; sets[i].size != 0; i++) { + if (sets[i].size < *low) { + *low = sets[i].size; + } + if (sets[i].size > *high) { + *high = sets[i].size; + } + } +} + +/** + Make a new ECC key + @param prng An active PRNG state + @param wprng The index of the PRNG you wish to use + @param keysize The keysize for the new key (in octets from 20 to 65 bytes) + @param key [out] Destination of the newly created key + @return CRYPT_OK if successful, upon error all allocated memory will be freed +*/ +int ecc_make_key(prng_state *prng, int wprng, int keysize, ecc_key *key) +{ + int x, err; + ecc_point *base; + mp_int prime; + unsigned char *buf; + + LTC_ARGCHK(key != NULL); + + /* good prng? */ + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + /* find key size */ + for (x = 0; (keysize > sets[x].size) && (sets[x].size != 0); x++); + keysize = sets[x].size; + + if (keysize > ECC_MAXSIZE || sets[x].size == 0) { + return CRYPT_INVALID_KEYSIZE; + } + key->idx = x; + + /* allocate ram */ + base = NULL; + buf = XMALLOC(ECC_MAXSIZE); + if (buf == NULL) { + return CRYPT_MEM; + } + + /* make up random string */ + if (prng_descriptor[wprng].read(buf, (unsigned long)keysize, prng) != (unsigned long)keysize) { + err = CRYPT_ERROR_READPRNG; + goto LBL_ERR2; + } + + /* setup the key variables */ + if ((err = mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, &prime, NULL)) != MP_OKAY) { + err = mpi_to_ltc_error(err); + goto LBL_ERR; + } + base = new_point(); + if (base == NULL) { + mp_clear_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, &prime, NULL); + err = CRYPT_MEM; + goto LBL_ERR; + } + + /* read in the specs for this key */ + if ((err = mp_read_radix(&prime, (char *)sets[key->idx].prime, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&base->x, (char *)sets[key->idx].Gx, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&base->y, (char *)sets[key->idx].Gy, 64)) != MP_OKAY) { goto error; } + mp_set(&base->z, 1); + if ((err = mp_read_unsigned_bin(&key->k, (unsigned char *)buf, keysize)) != MP_OKAY) { goto error; } + + /* make the public key */ + if ((err = ecc_mulmod(&key->k, base, &key->pubkey, &prime, 1)) != CRYPT_OK) { goto LBL_ERR; } + key->type = PK_PRIVATE; + + /* shrink key */ + if ((err = mp_shrink(&key->k)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->pubkey.x)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->pubkey.y)) != MP_OKAY) { goto error; } + if ((err = mp_shrink(&key->pubkey.z)) != MP_OKAY) { goto error; } + + /* free up ram */ + err = CRYPT_OK; + goto LBL_ERR; +error: + err = mpi_to_ltc_error(err); +LBL_ERR: + del_point(base); + mp_clear(&prime); +LBL_ERR2: +#ifdef LTC_CLEAN_STACK + zeromem(buf, ECC_MAXSIZE); +#endif + + XFREE(buf); + + return err; +} + +/** + Free an ECC key from memory + @param key The key you wish to free +*/ +void ecc_free(ecc_key *key) +{ + LTC_ARGCHK(key != NULL); + mp_clear_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL); +} + +/** + Export an ECC key as a binary packet + @param out [out] Destination for the key + @param outlen [in/out] Max size and resulting size of the exported key + @param type The type of key you want to export (PK_PRIVATE or PK_PUBLIC) + @param key The key to export + @return CRYPT_OK if successful +*/ +int ecc_export(unsigned char *out, unsigned long *outlen, int type, ecc_key *key) +{ + int err; + unsigned char flags[1]; + unsigned long key_size; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* type valid? */ + if (key->type != PK_PRIVATE && type == PK_PRIVATE) { + return CRYPT_PK_TYPE_MISMATCH; + } + + if (is_valid_idx(key->idx) == 0) { + return CRYPT_INVALID_ARG; + } + + /* we store the NIST byte size */ + key_size = sets[key->idx].size; + + if (type == PK_PRIVATE) { + flags[0] = 1; + err = der_encode_sequence_multi(out, outlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_SHORT_INTEGER, 1UL, &key_size, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.x, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.y, + LTC_ASN1_INTEGER, 1UL, &key->k, + LTC_ASN1_EOL, 0UL, NULL); + } else { + flags[0] = 0; + err = der_encode_sequence_multi(out, outlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_SHORT_INTEGER, 1UL, &key_size, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.x, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.y, + LTC_ASN1_EOL, 0UL, NULL); + } + + return err; +} + +/** + Import an ECC key from a binary packet + @param in The packet to import + @param inlen The length of the packet + @param key [out] The destination of the import + @return CRYPT_OK if successful, upon error all allocated memory will be freed +*/ +int ecc_import(const unsigned char *in, unsigned long inlen, ecc_key *key) +{ + unsigned long key_size; + unsigned char flags[1]; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(key != NULL); + + /* init key */ + if (mp_init_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL) != MP_OKAY) { + return CRYPT_MEM; + } + + /* find out what type of key it is */ + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_BIT_STRING, 1UL, &flags, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto error; + } + + + if (flags[0] == 1) { + /* private key */ + key->type = PK_PRIVATE; + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_SHORT_INTEGER, 1UL, &key_size, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.x, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.y, + LTC_ASN1_INTEGER, 1UL, &key->k, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto error; + } + } else { + /* public key */ + /* private key */ + key->type = PK_PUBLIC; + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_BIT_STRING, 1UL, flags, + LTC_ASN1_SHORT_INTEGER, 1UL, &key_size, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.x, + LTC_ASN1_INTEGER, 1UL, &key->pubkey.y, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto error; + } + } + + /* find the idx */ + for (key->idx = 0; sets[key->idx].size && (unsigned long)sets[key->idx].size != key_size; ++key->idx); + if (sets[key->idx].size == 0) { + err = CRYPT_INVALID_PACKET; + goto error; + } + + /* set z */ + mp_set(&key->pubkey.z, 1); + + /* we're good */ + return CRYPT_OK; +error: + mp_clear_multi(&key->pubkey.x, &key->pubkey.y, &key->pubkey.z, &key->k, NULL); + return err; +} + +/** + Create an ECC shared secret between two keys + @param private_key The private ECC key + @param public_key The public key + @param out [out] Destination of the shared secret (Conforms to EC-DH from ANSI X9.63) + @param outlen [in/out] The max size and resulting size of the shared secret + @return CRYPT_OK if successful +*/ +int ecc_shared_secret(ecc_key *private_key, ecc_key *public_key, + unsigned char *out, unsigned long *outlen) +{ + unsigned long x; + ecc_point *result; + mp_int prime; + int err; + + LTC_ARGCHK(private_key != NULL); + LTC_ARGCHK(public_key != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* type valid? */ + if (private_key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + if (is_valid_idx(private_key->idx) == 0) { + return CRYPT_INVALID_ARG; + } + + if (private_key->idx != public_key->idx) { + return CRYPT_PK_TYPE_MISMATCH; + } + + /* make new point */ + result = new_point(); + if (result == NULL) { + return CRYPT_MEM; + } + + if ((err = mp_init(&prime)) != MP_OKAY) { + del_point(result); + return mpi_to_ltc_error(err); + } + + if ((err = mp_read_radix(&prime, (char *)sets[private_key->idx].prime, 64)) != MP_OKAY) { goto error; } + if ((err = ecc_mulmod(&private_key->k, &public_key->pubkey, result, &prime, 1)) != CRYPT_OK) { goto done1; } + + x = (unsigned long)mp_unsigned_bin_size(&prime); + if (*outlen < x) { + err = CRYPT_BUFFER_OVERFLOW; + goto done1; + } + zeromem(out, x); + if ((err = mp_to_unsigned_bin(&result->x, out + (x - mp_unsigned_bin_size(&result->x)))) != MP_OKAY) { goto error; } + + err = CRYPT_OK; + *outlen = x; + goto done1; +error: + err = mpi_to_ltc_error(err); +done1: + mp_clear(&prime); + del_point(result); + return err; +} + +/** + Get the size of an ECC key + @param key The key to get the size of + @return The size (octets) of the key or INT_MAX on error +*/ +int ecc_get_size(ecc_key *key) +{ + LTC_ARGCHK(key != NULL); + if (is_valid_idx(key->idx)) + return sets[key->idx].size; + else + return INT_MAX; /* large value known to cause it to fail when passed to ecc_make_key() */ +} + +#include "ecc_sys.c" + +#endif + + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc.c,v $ */ +/* $Revision: 1.20 $ */ +/* $Date: 2005/06/14 20:42:28 $ */ diff --git a/libtomcrypt/src/pk/ecc/ecc_sys.c b/libtomcrypt/src/pk/ecc/ecc_sys.c new file mode 100644 index 0000000..65ead31 --- /dev/null +++ b/libtomcrypt/src/pk/ecc/ecc_sys.c @@ -0,0 +1,462 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ + +/** + @file ecc_sys.c + ECC Crypto, Tom St Denis +*/ + +/** + Encrypt a symmetric key with ECC + @param in The symmetric key you want to encrypt + @param inlen The length of the key to encrypt (octets) + @param out [out] The destination for the ciphertext + @param outlen [in/out] The max size and resulting size of the ciphertext + @param prng An active PRNG state + @param wprng The index of the PRNG you wish to use + @param hash The index of the hash you want to use + @param key The ECC key you want to encrypt to + @return CRYPT_OK if successful +*/ +int ecc_encrypt_key(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + prng_state *prng, int wprng, int hash, + ecc_key *key) +{ + unsigned char *pub_expt, *ecc_shared, *skey; + ecc_key pubkey; + unsigned long x, y, pubkeysize; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* check that wprng/cipher/hash are not invalid */ + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + if ((err = hash_is_valid(hash)) != CRYPT_OK) { + return err; + } + + if (inlen > hash_descriptor[hash].hashsize) { + return CRYPT_INVALID_HASH; + } + + /* make a random key and export the public copy */ + if ((err = ecc_make_key(prng, wprng, ecc_get_size(key), &pubkey)) != CRYPT_OK) { + return err; + } + + pub_expt = XMALLOC(ECC_BUF_SIZE); + ecc_shared = XMALLOC(ECC_BUF_SIZE); + skey = XMALLOC(MAXBLOCKSIZE); + if (pub_expt == NULL || ecc_shared == NULL || skey == NULL) { + if (pub_expt != NULL) { + XFREE(pub_expt); + } + if (ecc_shared != NULL) { + XFREE(ecc_shared); + } + if (skey != NULL) { + XFREE(skey); + } + ecc_free(&pubkey); + return CRYPT_MEM; + } + + pubkeysize = ECC_BUF_SIZE; + if ((err = ecc_export(pub_expt, &pubkeysize, PK_PUBLIC, &pubkey)) != CRYPT_OK) { + ecc_free(&pubkey); + goto LBL_ERR; + } + + /* make random key */ + x = ECC_BUF_SIZE; + if ((err = ecc_shared_secret(&pubkey, key, ecc_shared, &x)) != CRYPT_OK) { + ecc_free(&pubkey); + goto LBL_ERR; + } + ecc_free(&pubkey); + y = MAXBLOCKSIZE; + if ((err = hash_memory(hash, ecc_shared, x, skey, &y)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* Encrypt key */ + for (x = 0; x < inlen; x++) { + skey[x] ^= in[x]; + } + + err = der_encode_sequence_multi(out, outlen, + LTC_ASN1_OBJECT_IDENTIFIER, hash_descriptor[hash].OIDlen, hash_descriptor[hash].OID, + LTC_ASN1_OCTET_STRING, pubkeysize, pub_expt, + LTC_ASN1_OCTET_STRING, inlen, skey, + LTC_ASN1_EOL, 0UL, NULL); + +LBL_ERR: +#ifdef LTC_CLEAN_STACK + /* clean up */ + zeromem(pub_expt, ECC_BUF_SIZE); + zeromem(ecc_shared, ECC_BUF_SIZE); + zeromem(skey, MAXBLOCKSIZE); +#endif + + XFREE(skey); + XFREE(ecc_shared); + XFREE(pub_expt); + + return err; +} + +/** + Decrypt an ECC encrypted key + @param in The ciphertext + @param inlen The length of the ciphertext (octets) + @param out [out] The plaintext + @param outlen [in/out] The max size and resulting size of the plaintext + @param key The corresponding private ECC key + @return CRYPT_OK if successful +*/ +int ecc_decrypt_key(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + ecc_key *key) +{ + unsigned char *ecc_shared, *skey, *pub_expt; + unsigned long x, y, hashOID[32]; + int hash, err; + ecc_key pubkey; + ltc_asn1_list decode[3]; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* right key type? */ + if (key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + /* decode to find out hash */ + LTC_SET_ASN1(decode, 0, LTC_ASN1_OBJECT_IDENTIFIER, hashOID, sizeof(hashOID)/sizeof(hashOID[0])); + + if ((err = der_decode_sequence(in, inlen, decode, 1)) != CRYPT_OK) { + return err; + } + for (hash = 0; hash_descriptor[hash].name != NULL && + (hash_descriptor[hash].OIDlen != decode[0].size || + memcmp(hash_descriptor[hash].OID, hashOID, sizeof(unsigned long)*decode[0].size)); hash++); + + if (hash_descriptor[hash].name == NULL) { + return CRYPT_INVALID_PACKET; + } + + /* we now have the hash! */ + + /* allocate memory */ + pub_expt = XMALLOC(ECC_BUF_SIZE); + ecc_shared = XMALLOC(ECC_BUF_SIZE); + skey = XMALLOC(MAXBLOCKSIZE); + if (pub_expt == NULL || ecc_shared == NULL || skey == NULL) { + if (pub_expt != NULL) { + XFREE(pub_expt); + } + if (ecc_shared != NULL) { + XFREE(ecc_shared); + } + if (skey != NULL) { + XFREE(skey); + } + return CRYPT_MEM; + } + LTC_SET_ASN1(decode, 1, LTC_ASN1_OCTET_STRING, pub_expt, ECC_BUF_SIZE); + LTC_SET_ASN1(decode, 2, LTC_ASN1_OCTET_STRING, skey, MAXBLOCKSIZE); + + /* read the structure in now */ + if ((err = der_decode_sequence(in, inlen, decode, 3)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* import ECC key from packet */ + if ((err = ecc_import(decode[1].data, decode[1].size, &pubkey)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* make shared key */ + x = ECC_BUF_SIZE; + if ((err = ecc_shared_secret(key, &pubkey, ecc_shared, &x)) != CRYPT_OK) { + ecc_free(&pubkey); + goto LBL_ERR; + } + ecc_free(&pubkey); + + y = MAXBLOCKSIZE; + if ((err = hash_memory(hash, ecc_shared, x, ecc_shared, &y)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* ensure the hash of the shared secret is at least as big as the encrypt itself */ + if (decode[2].size > y) { + err = CRYPT_INVALID_PACKET; + goto LBL_ERR; + } + + /* avoid buffer overflow */ + if (*outlen < decode[2].size) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* Decrypt the key */ + for (x = 0; x < decode[2].size; x++) { + out[x] = skey[x] ^ ecc_shared[x]; + } + *outlen = x; + + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(pub_expt, ECC_BUF_SIZE); + zeromem(ecc_shared, ECC_BUF_SIZE); + zeromem(skey, MAXBLOCKSIZE); +#endif + + XFREE(pub_expt); + XFREE(ecc_shared); + XFREE(skey); + + return err; +} + +/** + Sign a message digest + @param in The message digest to sign + @param inlen The length of the digest + @param out [out] The destination for the signature + @param outlen [in/out] The max size and resulting size of the signature + @param prng An active PRNG state + @param wprng The index of the PRNG you wish to use + @param key A private ECC key + @return CRYPT_OK if successful +*/ +int ecc_sign_hash(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + prng_state *prng, int wprng, ecc_key *key) +{ + ecc_key pubkey; + mp_int r, s, e, p; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* is this a private key? */ + if (key->type != PK_PRIVATE) { + return CRYPT_PK_NOT_PRIVATE; + } + + /* is the IDX valid ? */ + if (is_valid_idx(key->idx) != 1) { + return CRYPT_PK_INVALID_TYPE; + } + + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + /* get the hash and load it as a bignum into 'e' */ + /* init the bignums */ + if ((err = mp_init_multi(&r, &s, &p, &e, NULL)) != MP_OKAY) { + ecc_free(&pubkey); + err = mpi_to_ltc_error(err); + goto LBL_ERR; + } + if ((err = mp_read_radix(&p, (char *)sets[key->idx].order, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_unsigned_bin(&e, (unsigned char *)in, (int)inlen)) != MP_OKAY) { goto error; } + + /* make up a key and export the public copy */ + for (;;) { + if ((err = ecc_make_key(prng, wprng, ecc_get_size(key), &pubkey)) != CRYPT_OK) { + return err; + } + + /* find r = x1 mod n */ + if ((err = mp_mod(&pubkey.pubkey.x, &p, &r)) != MP_OKAY) { goto error; } + + if (mp_iszero(&r)) { + ecc_free(&pubkey); + } else { + /* find s = (e + xr)/k */ + if ((err = mp_invmod(&pubkey.k, &p, &pubkey.k)) != MP_OKAY) { goto error; } /* k = 1/k */ + if ((err = mp_mulmod(&key->k, &r, &p, &s)) != MP_OKAY) { goto error; } /* s = xr */ + if ((err = mp_addmod(&e, &s, &p, &s)) != MP_OKAY) { goto error; } /* s = e + xr */ + if ((err = mp_mulmod(&s, &pubkey.k, &p, &s)) != MP_OKAY) { goto error; } /* s = (e + xr)/k */ + + if (mp_iszero(&s)) { + ecc_free(&pubkey); + } else { + break; + } + } + } + + /* store as SEQUENCE { r, s -- integer } */ + err = der_encode_sequence_multi(out, outlen, + LTC_ASN1_INTEGER, 1UL, &r, + LTC_ASN1_INTEGER, 1UL, &s, + LTC_ASN1_EOL, 0UL, NULL); + goto LBL_ERR; +error: + err = mpi_to_ltc_error(err); +LBL_ERR: + mp_clear_multi(&r, &s, &p, &e, NULL); + ecc_free(&pubkey); + + return err; +} + +/* verify + * + * w = s^-1 mod n + * u1 = xw + * u2 = rw + * X = u1*G + u2*Q + * v = X_x1 mod n + * accept if v == r + */ + +/** + Verify an ECC signature + @param sig The signature to verify + @param siglen The length of the signature (octets) + @param hash The hash (message digest) that was signed + @param hashlen The length of the hash (octets) + @param stat Result of signature, 1==valid, 0==invalid + @param key The corresponding public ECC key + @return CRYPT_OK if successful (even if the signature is not valid) +*/ +int ecc_verify_hash(const unsigned char *sig, unsigned long siglen, + const unsigned char *hash, unsigned long hashlen, + int *stat, ecc_key *key) +{ + ecc_point *mG, *mQ; + mp_int r, s, v, w, u1, u2, e, p, m; + mp_digit mp; + int err; + + LTC_ARGCHK(sig != NULL); + LTC_ARGCHK(hash != NULL); + LTC_ARGCHK(stat != NULL); + LTC_ARGCHK(key != NULL); + + /* default to invalid signature */ + *stat = 0; + + /* is the IDX valid ? */ + if (is_valid_idx(key->idx) != 1) { + return CRYPT_PK_INVALID_TYPE; + } + + /* allocate ints */ + if ((err = mp_init_multi(&r, &s, &v, &w, &u1, &u2, &p, &e, &m, NULL)) != MP_OKAY) { + return CRYPT_MEM; + } + + /* allocate points */ + mG = new_point(); + mQ = new_point(); + if (mQ == NULL || mG == NULL) { + err = CRYPT_MEM; + goto done; + } + + /* parse header */ + if ((err = der_decode_sequence_multi(sig, siglen, + LTC_ASN1_INTEGER, 1UL, &r, + LTC_ASN1_INTEGER, 1UL, &s, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto done; + } + + /* get the order */ + if ((err = mp_read_radix(&p, (char *)sets[key->idx].order, 64)) != MP_OKAY) { goto error; } + + /* get the modulus */ + if ((err = mp_read_radix(&m, (char *)sets[key->idx].prime, 64)) != MP_OKAY) { goto error; } + + /* check for zero */ + if (mp_iszero(&r) || mp_iszero(&s) || mp_cmp(&r, &p) != MP_LT || mp_cmp(&s, &p) != MP_LT) { + err = CRYPT_INVALID_PACKET; + goto done; + } + + /* read hash */ + if ((err = mp_read_unsigned_bin(&e, (unsigned char *)hash, (int)hashlen)) != MP_OKAY) { goto error; } + + /* w = s^-1 mod n */ + if ((err = mp_invmod(&s, &p, &w)) != MP_OKAY) { goto error; } + + /* u1 = ew */ + if ((err = mp_mulmod(&e, &w, &p, &u1)) != MP_OKAY) { goto error; } + + /* u2 = rw */ + if ((err = mp_mulmod(&r, &w, &p, &u2)) != MP_OKAY) { goto error; } + + /* find mG = u1*G */ + if ((err = mp_read_radix(&mG->x, (char *)sets[key->idx].Gx, 64)) != MP_OKAY) { goto error; } + if ((err = mp_read_radix(&mG->y, (char *)sets[key->idx].Gy, 64)) != MP_OKAY) { goto error; } + mp_set(&mG->z, 1); + if ((err = ecc_mulmod(&u1, mG, mG, &m, 0)) != CRYPT_OK) { goto done; } + + /* find mQ = u2*Q */ + if ((err = mp_copy(&key->pubkey.x, &mQ->x)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&key->pubkey.y, &mQ->y)) != MP_OKAY) { goto error; } + if ((err = mp_copy(&key->pubkey.z, &mQ->z)) != MP_OKAY) { goto error; } + if ((err = ecc_mulmod(&u2, mQ, mQ, &m, 0)) != CRYPT_OK) { goto done; } + + /* find the montgomery mp */ + if ((err = mp_montgomery_setup(&m, &mp)) != MP_OKAY) { goto error; } + /* add them */ + if ((err = add_point(mQ, mG, mG, &m, mp)) != CRYPT_OK) { goto done; } + + /* reduce */ + if ((err = ecc_map(mG, &m, mp)) != CRYPT_OK) { goto done; } + + /* v = X_x1 mod n */ + if ((err = mp_mod(&mG->x, &p, &v)) != CRYPT_OK) { goto done; } + + /* does v == r */ + if (mp_cmp(&v, &r) == MP_EQ) { + *stat = 1; + } + + /* clear up and return */ + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + del_point(mG); + del_point(mQ); + mp_clear_multi(&r, &s, &v, &w, &u1, &u2, &p, &e, &m, NULL); + return err; +} + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/ecc/ecc_sys.c,v $ */ +/* $Revision: 1.18 $ */ +/* $Date: 2005/06/14 20:47:55 $ */ diff --git a/libtomcrypt/src/pk/packet_store_header.c b/libtomcrypt/src/pk/packet_store_header.c new file mode 100644 index 0000000..855ca70 --- /dev/null +++ b/libtomcrypt/src/pk/packet_store_header.c @@ -0,0 +1,33 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +#ifdef PACKET + +void packet_store_header(unsigned char *dst, int section, int subsection) +{ + LTC_ARGCHK(dst != NULL); + + /* store version number */ + dst[0] = (unsigned char)(CRYPT&255); + dst[1] = (unsigned char)((CRYPT>>8)&255); + + /* store section and subsection */ + dst[2] = (unsigned char)(section & 255); + dst[3] = (unsigned char)(subsection & 255); + +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/packet_store_header.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/packet_valid_header.c b/libtomcrypt/src/pk/packet_valid_header.c new file mode 100644 index 0000000..59db0f7 --- /dev/null +++ b/libtomcrypt/src/pk/packet_valid_header.c @@ -0,0 +1,41 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +#ifdef PACKET + +int packet_valid_header(unsigned char *src, int section, int subsection) +{ + unsigned long ver; + + LTC_ARGCHK(src != NULL); + + /* check version */ + ver = ((unsigned long)src[0]) | ((unsigned long)src[1] << 8U); + if (CRYPT < ver) { + return CRYPT_INVALID_PACKET; + } + + /* check section and subsection */ + if (section != (int)src[2] || subsection != (int)src[3]) { + return CRYPT_INVALID_PACKET; + } + + return CRYPT_OK; +} + +#endif + + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/packet_valid_header.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c new file mode 100644 index 0000000..3e68eb8 --- /dev/null +++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c @@ -0,0 +1,55 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file pkcs_1_i2osp.c + Integer to Octet I2OSP, Tom St Denis +*/ + +#ifdef PKCS_1 + +/* always stores the same # of bytes, pads with leading zero bytes + as required + */ + +/** + PKCS #1 Integer to binary + @param n The integer to store + @param modulus_len The length of the RSA modulus + @param out [out] The destination for the integer + @return CRYPT_OK if successful +*/ +int pkcs_1_i2osp(mp_int *n, unsigned long modulus_len, unsigned char *out) +{ + int err; + unsigned long size; + + size = mp_unsigned_bin_size(n); + + if (size > modulus_len) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* store it */ + zeromem(out, modulus_len); + if ((err = mp_to_unsigned_bin(n, out+(modulus_len-size))) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + return CRYPT_OK; +} + +#endif /* PKCS_1 */ + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_i2osp.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c new file mode 100644 index 0000000..aac7494 --- /dev/null +++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c @@ -0,0 +1,108 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file pkcs_1_mgf1.c + The Mask Generation Function (MGF1) for PKCS #1, Tom St Denis +*/ + +#ifdef PKCS_1 + +/** + Perform PKCS #1 MGF1 (internal) + @param seed The seed for MGF1 + @param seedlen The length of the seed + @param hash_idx The index of the hash desired + @param mask [out] The destination + @param masklen The length of the mask desired + @return CRYPT_OK if successful +*/ +int pkcs_1_mgf1(const unsigned char *seed, unsigned long seedlen, + int hash_idx, + unsigned char *mask, unsigned long masklen) +{ + unsigned long hLen, x; + ulong32 counter; + int err; + hash_state *md; + unsigned char *buf; + + LTC_ARGCHK(seed != NULL); + LTC_ARGCHK(mask != NULL); + + /* ensure valid hash */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + + /* get hash output size */ + hLen = hash_descriptor[hash_idx].hashsize; + + /* allocate memory */ + md = XMALLOC(sizeof(hash_state)); + buf = XMALLOC(hLen); + if (md == NULL || buf == NULL) { + if (md != NULL) { + XFREE(md); + } + if (buf != NULL) { + XFREE(buf); + } + return CRYPT_MEM; + } + + /* start counter */ + counter = 0; + + while (masklen > 0) { + /* handle counter */ + STORE32H(counter, buf); + ++counter; + + /* get hash of seed || counter */ + if ((err = hash_descriptor[hash_idx].init(md)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].process(md, seed, seedlen)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].process(md, buf, 4)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].done(md, buf)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* store it */ + for (x = 0; x < hLen && masklen > 0; x++, masklen--) { + *mask++ = buf[x]; + } + } + + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(buf, hLen); + zeromem(md, sizeof(hash_state)); +#endif + + XFREE(buf); + XFREE(md); + + return err; +} + +#endif /* PKCS_1 */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_mgf1.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_decode.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_decode.c new file mode 100644 index 0000000..cd4931b --- /dev/null +++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_decode.c @@ -0,0 +1,188 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file pkcs_1_oaep_decode.c + OAEP Padding for PKCS #1, Tom St Denis +*/ + +#ifdef PKCS_1 + +/** + PKCS #1 v2.00 OAEP decode + @param msg The encoded data to decode + @param msglen The length of the encoded data (octets) + @param lparam The session or system data (can be NULL) + @param lparamlen The length of the lparam + @param modulus_bitlen The bit length of the RSA modulus + @param hash_idx The index of the hash desired + @param out [out] Destination of decoding + @param outlen [in/out] The max size and resulting size of the decoding + @param res [out] Result of decoding, 1==valid, 0==invalid + @return CRYPT_OK if successful (even if invalid) +*/ +int pkcs_1_oaep_decode(const unsigned char *msg, unsigned long msglen, + const unsigned char *lparam, unsigned long lparamlen, + unsigned long modulus_bitlen, int hash_idx, + unsigned char *out, unsigned long *outlen, + int *res) +{ + unsigned char *DB, *seed, *mask; + unsigned long hLen, x, y, modulus_len; + int err; + + LTC_ARGCHK(msg != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(res != NULL); + + /* default to invalid packet */ + *res = 0; + + /* test valid hash */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + hLen = hash_descriptor[hash_idx].hashsize; + modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0); + + /* test hash/message size */ + if ((2*hLen >= (modulus_len - 2)) || (msglen != modulus_len)) { + return CRYPT_PK_INVALID_SIZE; + } + + /* allocate ram for DB/mask/salt of size modulus_len */ + DB = XMALLOC(modulus_len); + mask = XMALLOC(modulus_len); + seed = XMALLOC(hLen); + if (DB == NULL || mask == NULL || seed == NULL) { + if (DB != NULL) { + XFREE(DB); + } + if (mask != NULL) { + XFREE(mask); + } + if (seed != NULL) { + XFREE(seed); + } + return CRYPT_MEM; + } + + /* ok so it's now in the form + + 0x00 || maskedseed || maskedDB + + 1 || hLen || modulus_len - hLen - 1 + + */ + + /* must have leading 0x00 byte */ + if (msg[0] != 0x00) { + err = CRYPT_OK; + goto LBL_ERR; + } + + /* now read the masked seed */ + x = 1; + XMEMCPY(seed, msg + x, hLen); + x += hLen; + + /* now read the masked DB */ + XMEMCPY(DB, msg + x, modulus_len - hLen - 1); + x += modulus_len - hLen - 1; + + /* compute MGF1 of maskedDB (hLen) */ + if ((err = pkcs_1_mgf1(DB, modulus_len - hLen - 1, hash_idx, mask, hLen)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* XOR against seed */ + for (y = 0; y < hLen; y++) { + seed[y] ^= mask[y]; + } + + /* compute MGF1 of seed (k - hlen - 1) */ + if ((err = pkcs_1_mgf1(seed, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* xor against DB */ + for (y = 0; y < (modulus_len - hLen - 1); y++) { + DB[y] ^= mask[y]; + } + + /* now DB == lhash || PS || 0x01 || M, PS == k - mlen - 2hlen - 2 zeroes */ + + /* compute lhash and store it in seed [reuse temps!] */ + x = modulus_len; + if (lparam != NULL) { + if ((err = hash_memory(hash_idx, lparam, lparamlen, seed, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + } else { + /* can't pass hash_memory a NULL so use DB with zero length */ + if ((err = hash_memory(hash_idx, DB, 0, seed, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + } + + /* compare the lhash'es */ + if (memcmp(seed, DB, hLen) != 0) { + err = CRYPT_OK; + goto LBL_ERR; + } + + /* now zeroes before a 0x01 */ + for (x = hLen; x < (modulus_len - hLen - 1) && DB[x] == 0x00; x++) { + /* step... */ + } + + /* error out if wasn't 0x01 */ + if (x == (modulus_len - hLen - 1) || DB[x] != 0x01) { + err = CRYPT_OK; + goto LBL_ERR; + } + + /* rest is the message (and skip 0x01) */ + if ((modulus_len - hLen - 1) - ++x > *outlen) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* copy message */ + *outlen = (modulus_len - hLen - 1) - x; + XMEMCPY(out, DB + x, modulus_len - hLen - 1 - x); + x += modulus_len - hLen - 1; + + /* valid packet */ + *res = 1; + + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(DB, modulus_len); + zeromem(seed, hLen); + zeromem(mask, modulus_len); +#endif + + XFREE(seed); + XFREE(mask); + XFREE(DB); + + return err; +} + +#endif /* PKCS_1 */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_decode.c,v $ */ +/* $Revision: 1.5 $ */ +/* $Date: 2005/06/18 02:37:06 $ */ diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_encode.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_encode.c new file mode 100644 index 0000000..12670b5 --- /dev/null +++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_encode.c @@ -0,0 +1,172 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file pkcs_1_oaep_encode.c + OAEP Padding for PKCS #1, Tom St Denis +*/ + +#ifdef PKCS_1 + +/** + PKCS #1 v2.00 OAEP encode + @param msg The data to encode + @param msglen The length of the data to encode (octets) + @param lparam A session or system parameter (can be NULL) + @param lparamlen The length of the lparam data + @param modulus_bitlen The bit length of the RSA modulus + @param prng An active PRNG state + @param prng_idx The index of the PRNG desired + @param hash_idx The index of the hash desired + @param out [out] The destination for the encoded data + @param outlen [in/out] The max size and resulting size of the encoded data + @return CRYPT_OK if successful +*/ +int pkcs_1_oaep_encode(const unsigned char *msg, unsigned long msglen, + const unsigned char *lparam, unsigned long lparamlen, + unsigned long modulus_bitlen, prng_state *prng, + int prng_idx, int hash_idx, + unsigned char *out, unsigned long *outlen) +{ + unsigned char *DB, *seed, *mask; + unsigned long hLen, x, y, modulus_len; + int err; + + LTC_ARGCHK(msg != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* test valid hash */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + + /* valid prng */ + if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { + return err; + } + + hLen = hash_descriptor[hash_idx].hashsize; + modulus_len = (modulus_bitlen >> 3) + (modulus_bitlen & 7 ? 1 : 0); + + /* test message size */ + if ((2*hLen >= (modulus_len - 2)) || (msglen > (modulus_len - 2*hLen - 2))) { + return CRYPT_PK_INVALID_SIZE; + } + + /* allocate ram for DB/mask/salt of size modulus_len */ + DB = XMALLOC(modulus_len); + mask = XMALLOC(modulus_len); + seed = XMALLOC(hLen); + if (DB == NULL || mask == NULL || seed == NULL) { + if (DB != NULL) { + XFREE(DB); + } + if (mask != NULL) { + XFREE(mask); + } + if (seed != NULL) { + XFREE(seed); + } + return CRYPT_MEM; + } + + /* get lhash */ + /* DB == lhash || PS || 0x01 || M, PS == k - mlen - 2hlen - 2 zeroes */ + x = modulus_len; + if (lparam != NULL) { + if ((err = hash_memory(hash_idx, lparam, lparamlen, DB, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + } else { + /* can't pass hash_memory a NULL so use DB with zero length */ + if ((err = hash_memory(hash_idx, DB, 0, DB, &x)) != CRYPT_OK) { + goto LBL_ERR; + } + } + + /* append PS then 0x01 (to lhash) */ + x = hLen; + y = modulus_len - msglen - 2*hLen - 2; + XMEMSET(DB+x, 0, y); + x += y; + + /* 0x01 byte */ + DB[x++] = 0x01; + + /* message (length = msglen) */ + XMEMCPY(DB+x, msg, msglen); + x += msglen; + + /* now choose a random seed */ + if (prng_descriptor[prng_idx].read(seed, hLen, prng) != hLen) { + err = CRYPT_ERROR_READPRNG; + goto LBL_ERR; + } + + /* compute MGF1 of seed (k - hlen - 1) */ + if ((err = pkcs_1_mgf1(seed, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* xor against DB */ + for (y = 0; y < (modulus_len - hLen - 1); y++) { + DB[y] ^= mask[y]; + } + + /* compute MGF1 of maskedDB (hLen) */ + if ((err = pkcs_1_mgf1(DB, modulus_len - hLen - 1, hash_idx, mask, hLen)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* XOR against seed */ + for (y = 0; y < hLen; y++) { + seed[y] ^= mask[y]; + } + + /* create string of length modulus_len */ + if (*outlen < modulus_len) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* start output which is 0x00 || maskedSeed || maskedDB */ + x = 0; + out[x++] = 0x00; + XMEMCPY(out+x, seed, hLen); + x += hLen; + XMEMCPY(out+x, DB, modulus_len - hLen - 1); + x += modulus_len - hLen - 1; + + *outlen = x; + + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(DB, modulus_len); + zeromem(seed, hLen); + zeromem(mask, modulus_len); +#endif + + XFREE(seed); + XFREE(mask); + XFREE(DB); + + return err; +} + +#endif /* PKCS_1 */ + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_oaep_encode.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_os2ip.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_os2ip.c new file mode 100644 index 0000000..a9a1858 --- /dev/null +++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_os2ip.c @@ -0,0 +1,41 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file pkcs_1_os2ip.c + Octet to Integer OS2IP, Tom St Denis +*/ +#ifdef PKCS_1 + +/** + Read a binary string into an mp_int + @param n [out] The mp_int destination + @param in The binary string to read + @param inlen The length of the binary string + @return CRYPT_OK if successful +*/ +int pkcs_1_os2ip(mp_int *n, unsigned char *in, unsigned long inlen) +{ + int err; + /* read it */ + if ((err = mp_read_unsigned_bin(n, in, inlen)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + return CRYPT_OK; +} + +#endif /* PKCS_1 */ + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_os2ip.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_decode.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_decode.c new file mode 100644 index 0000000..e61c33f --- /dev/null +++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_decode.c @@ -0,0 +1,177 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file pkcs_1_pss_decode.c + PKCS #1 PSS Signature Padding, Tom St Denis +*/ + +#ifdef PKCS_1 + +/** + PKCS #1 v2.00 PSS decode + @param msghash The hash to verify + @param msghashlen The length of the hash (octets) + @param sig The signature data (encoded data) + @param siglen The length of the signature data (octets) + @param saltlen The length of the salt used (octets) + @param hash_idx The index of the hash desired + @param modulus_bitlen The bit length of the RSA modulus + @param res [out] The result of the comparison, 1==valid, 0==invalid + @return CRYPT_OK if successful (even if the comparison failed) +*/ +int pkcs_1_pss_decode(const unsigned char *msghash, unsigned long msghashlen, + const unsigned char *sig, unsigned long siglen, + unsigned long saltlen, int hash_idx, + unsigned long modulus_bitlen, int *res) +{ + unsigned char *DB, *mask, *salt, *hash; + unsigned long x, y, hLen, modulus_len; + int err; + hash_state md; + + LTC_ARGCHK(msghash != NULL); + LTC_ARGCHK(res != NULL); + + /* default to invalid */ + *res = 0; + + /* ensure hash is valid */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + + hLen = hash_descriptor[hash_idx].hashsize; + modulus_len = (modulus_bitlen>>3) + (modulus_bitlen & 7 ? 1 : 0); + + /* check sizes */ + if ((saltlen > modulus_len) || + (modulus_len < hLen + saltlen + 2) || (siglen != modulus_len)) { + return CRYPT_PK_INVALID_SIZE; + } + + /* allocate ram for DB/mask/salt/hash of size modulus_len */ + DB = XMALLOC(modulus_len); + mask = XMALLOC(modulus_len); + salt = XMALLOC(modulus_len); + hash = XMALLOC(modulus_len); + if (DB == NULL || mask == NULL || salt == NULL || hash == NULL) { + if (DB != NULL) { + XFREE(DB); + } + if (mask != NULL) { + XFREE(mask); + } + if (salt != NULL) { + XFREE(salt); + } + if (hash != NULL) { + XFREE(hash); + } + return CRYPT_MEM; + } + + /* ensure the 0xBC byte */ + if (sig[siglen-1] != 0xBC) { + err = CRYPT_OK; + goto LBL_ERR; + } + + /* copy out the DB */ + x = 0; + XMEMCPY(DB, sig + x, modulus_len - hLen - 1); + x += modulus_len - hLen - 1; + + /* copy out the hash */ + XMEMCPY(hash, sig + x, hLen); + x += hLen; + + /* check the MSB */ + if ((sig[0] & ~(0xFF >> ((modulus_len<<3) - (modulus_bitlen-1)))) != 0) { + err = CRYPT_OK; + goto LBL_ERR; + } + + /* generate mask of length modulus_len - hLen - 1 from hash */ + if ((err = pkcs_1_mgf1(hash, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* xor against DB */ + for (y = 0; y < (modulus_len - hLen - 1); y++) { + DB[y] ^= mask[y]; + } + + /* now clear the first byte [make sure smaller than modulus] */ + DB[0] &= 0xFF >> ((modulus_len<<3) - (modulus_bitlen-1)); + + /* DB = PS || 0x01 || salt, PS == modulus_len - saltlen - hLen - 2 zero bytes */ + + /* check for zeroes and 0x01 */ + for (x = 0; x < modulus_len - saltlen - hLen - 2; x++) { + if (DB[x] != 0x00) { + err = CRYPT_OK; + goto LBL_ERR; + } + } + + /* check for the 0x01 */ + if (DB[x++] != 0x01) { + err = CRYPT_OK; + goto LBL_ERR; + } + + /* M = (eight) 0x00 || msghash || salt, mask = H(M) */ + if ((err = hash_descriptor[hash_idx].init(&md)) != CRYPT_OK) { + goto LBL_ERR; + } + zeromem(mask, 8); + if ((err = hash_descriptor[hash_idx].process(&md, mask, 8)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].process(&md, msghash, msghashlen)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].process(&md, DB+x, saltlen)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].done(&md, mask)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* mask == hash means valid signature */ + if (memcmp(mask, hash, hLen) == 0) { + *res = 1; + } + + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(DB, modulus_len); + zeromem(mask, modulus_len); + zeromem(salt, modulus_len); + zeromem(hash, modulus_len); +#endif + + XFREE(hash); + XFREE(salt); + XFREE(mask); + XFREE(DB); + + return err; +} + +#endif /* PKCS_1 */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_decode.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c b/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c new file mode 100644 index 0000000..899605c --- /dev/null +++ b/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c @@ -0,0 +1,174 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file pkcs_1_pss_encode.c + PKCS #1 PSS Signature Padding, Tom St Denis +*/ + +#ifdef PKCS_1 + +/** + PKCS #1 v2.00 Signature Encoding + @param msghash The hash to encode + @param msghashlen The length of the hash (octets) + @param saltlen The length of the salt desired (octets) + @param prng An active PRNG context + @param prng_idx The index of the PRNG desired + @param hash_idx The index of the hash desired + @param modulus_bitlen The bit length of the RSA modulus + @param out [out] The destination of the encoding + @param outlen [in/out] The max size and resulting size of the encoded data + @return CRYPT_OK if successful +*/ +int pkcs_1_pss_encode(const unsigned char *msghash, unsigned long msghashlen, + unsigned long saltlen, prng_state *prng, + int prng_idx, int hash_idx, + unsigned long modulus_bitlen, + unsigned char *out, unsigned long *outlen) +{ + unsigned char *DB, *mask, *salt, *hash; + unsigned long x, y, hLen, modulus_len; + int err; + hash_state md; + + LTC_ARGCHK(msghash != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + + /* ensure hash and PRNG are valid */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { + return err; + } + + hLen = hash_descriptor[hash_idx].hashsize; + modulus_len = (modulus_bitlen>>3) + (modulus_bitlen & 7 ? 1 : 0); + + /* check sizes */ + if ((saltlen > modulus_len) || (modulus_len < hLen + saltlen + 2)) { + return CRYPT_PK_INVALID_SIZE; + } + + /* allocate ram for DB/mask/salt/hash of size modulus_len */ + DB = XMALLOC(modulus_len); + mask = XMALLOC(modulus_len); + salt = XMALLOC(modulus_len); + hash = XMALLOC(modulus_len); + if (DB == NULL || mask == NULL || salt == NULL || hash == NULL) { + if (DB != NULL) { + XFREE(DB); + } + if (mask != NULL) { + XFREE(mask); + } + if (salt != NULL) { + XFREE(salt); + } + if (hash != NULL) { + XFREE(hash); + } + return CRYPT_MEM; + } + + + /* generate random salt */ + if (saltlen > 0) { + if (prng_descriptor[prng_idx].read(salt, saltlen, prng) != saltlen) { + err = CRYPT_ERROR_READPRNG; + goto LBL_ERR; + } + } + + /* M = (eight) 0x00 || msghash || salt, hash = H(M) */ + if ((err = hash_descriptor[hash_idx].init(&md)) != CRYPT_OK) { + goto LBL_ERR; + } + zeromem(DB, 8); + if ((err = hash_descriptor[hash_idx].process(&md, DB, 8)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].process(&md, msghash, msghashlen)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].process(&md, salt, saltlen)) != CRYPT_OK) { + goto LBL_ERR; + } + if ((err = hash_descriptor[hash_idx].done(&md, hash)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* generate DB = PS || 0x01 || salt, PS == modulus_len - saltlen - hLen - 2 zero bytes */ + x = 0; + XMEMSET(DB + x, 0, modulus_len - saltlen - hLen - 2); + x += modulus_len - saltlen - hLen - 2; + DB[x++] = 0x01; + XMEMCPY(DB + x, salt, saltlen); + x += saltlen; + + /* generate mask of length modulus_len - hLen - 1 from hash */ + if ((err = pkcs_1_mgf1(hash, hLen, hash_idx, mask, modulus_len - hLen - 1)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* xor against DB */ + for (y = 0; y < (modulus_len - hLen - 1); y++) { + DB[y] ^= mask[y]; + } + + /* output is DB || hash || 0xBC */ + if (*outlen < modulus_len) { + err = CRYPT_BUFFER_OVERFLOW; + goto LBL_ERR; + } + + /* DB len = modulus_len - hLen - 1 */ + y = 0; + XMEMCPY(out + y, DB, modulus_len - hLen - 1); + y += modulus_len - hLen - 1; + + /* hash */ + XMEMCPY(out + y, hash, hLen); + y += hLen; + + /* 0xBC */ + out[y] = 0xBC; + + /* now clear the 8*modulus_len - modulus_bitlen most significant bits */ + out[0] &= 0xFF >> ((modulus_len<<3) - (modulus_bitlen-1)); + + /* store output size */ + *outlen = modulus_len; + err = CRYPT_OK; +LBL_ERR: +#ifdef LTC_CLEAN_STACK + zeromem(DB, modulus_len); + zeromem(mask, modulus_len); + zeromem(salt, modulus_len); + zeromem(hash, modulus_len); +#endif + + XFREE(hash); + XFREE(salt); + XFREE(mask); + XFREE(DB); + + return err; +} + +#endif /* PKCS_1 */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/pkcs1/pkcs_1_pss_encode.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_decrypt_key.c b/libtomcrypt/src/pk/rsa/rsa_decrypt_key.c new file mode 100644 index 0000000..7cea807 --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_decrypt_key.c @@ -0,0 +1,93 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_decrypt_key.c + RSA PKCS #1 OAEP Decryption, Tom St Denis +*/ + +#ifdef MRSA + +/** + (PKCS #1 v2.0) decrypt then OAEP depad + @param in The ciphertext + @param inlen The length of the ciphertext (octets) + @param out [out] The plaintext + @param outlen [in/out] The max size and resulting size of the plaintext (octets) + @param lparam The system "lparam" value + @param lparamlen The length of the lparam value (octets) + @param hash_idx The index of the hash desired + @param stat [out] Result of the decryption, 1==valid, 0==invalid + @param key The corresponding private RSA key + @return CRYPT_OK if succcessul (even if invalid) +*/ +int rsa_decrypt_key(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + const unsigned char *lparam, unsigned long lparamlen, + int hash_idx, int *stat, + rsa_key *key) +{ + unsigned long modulus_bitlen, modulus_bytelen, x; + int err; + unsigned char *tmp; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + LTC_ARGCHK(stat != NULL); + + /* default to invalid */ + *stat = 0; + + /* valid hash ? */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + + /* get modulus len in bits */ + modulus_bitlen = mp_count_bits(&(key->N)); + + /* outlen must be at least the size of the modulus */ + modulus_bytelen = mp_unsigned_bin_size(&(key->N)); + if (modulus_bytelen != inlen) { + return CRYPT_INVALID_PACKET; + } + + /* allocate ram */ + tmp = XMALLOC(inlen); + if (tmp == NULL) { + return CRYPT_MEM; + } + + /* rsa decode the packet */ + x = inlen; + if ((err = rsa_exptmod(in, inlen, tmp, &x, PK_PRIVATE, key)) != CRYPT_OK) { + XFREE(tmp); + return err; + } + + /* now OAEP decode the packet */ + err = pkcs_1_oaep_decode(tmp, x, lparam, lparamlen, modulus_bitlen, hash_idx, + out, outlen, stat); + XFREE(tmp); + return err; +} + +#endif /* MRSA */ + + + + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_decrypt_key.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c b/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c new file mode 100644 index 0000000..d29aa83 --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c @@ -0,0 +1,80 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_encrypt_key.c + RSA PKCS OAEP encryption, Tom St Denis +*/ + +#ifdef MRSA + +/** + (PKCS #1 v2.0) OAEP pad then encrypt + @param in The plaintext + @param inlen The length of the plaintext (octets) + @param out [out] The ciphertext + @param outlen [in/out] The max size and resulting size of the ciphertext + @param lparam The system "lparam" for the encryption + @param lparamlen The length of lparam (octets) + @param prng An active PRNG + @param prng_idx The index of the desired prng + @param hash_idx The index of the desired hash + @param key The RSA key to encrypt to + @return CRYPT_OK if successful +*/ +int rsa_encrypt_key(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + const unsigned char *lparam, unsigned long lparamlen, + prng_state *prng, int prng_idx, int hash_idx, rsa_key *key) +{ + unsigned long modulus_bitlen, modulus_bytelen, x; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* valid prng and hash ? */ + if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { + return err; + } + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + + /* get modulus len in bits */ + modulus_bitlen = mp_count_bits(&(key->N)); + + /* outlen must be at least the size of the modulus */ + modulus_bytelen = mp_unsigned_bin_size(&(key->N)); + if (modulus_bytelen > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* OAEP pad the key */ + x = *outlen; + if ((err = pkcs_1_oaep_encode(in, inlen, lparam, + lparamlen, modulus_bitlen, prng, prng_idx, hash_idx, + out, &x)) != CRYPT_OK) { + return err; + } + + /* rsa exptmod the OAEP pad */ + return rsa_exptmod(out, x, out, outlen, PK_PUBLIC, key); +} + +#endif /* MRSA */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_export.c b/libtomcrypt/src/pk/rsa/rsa_export.c new file mode 100644 index 0000000..f2e324d --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_export.c @@ -0,0 +1,76 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_export.c + Export RSA PKCS keys, Tom St Denis +*/ + +#ifdef MRSA + +/** + This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1] + @param out [out] Destination of the packet + @param outlen [in/out] The max size and resulting size of the packet + @param type The type of exported key (PK_PRIVATE or PK_PUBLIC) + @param key The RSA key to export + @return CRYPT_OK if successful +*/ +int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key) +{ + int err; + unsigned long zero=0; + + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* type valid? */ + if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) { + return CRYPT_PK_INVALID_TYPE; + } + + if (type == PK_PRIVATE) { + /* private key */ + /* output is + Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p + */ + if ((err = der_encode_sequence_multi(out, outlen, + LTC_ASN1_SHORT_INTEGER, 1UL, &zero, + LTC_ASN1_INTEGER, 1UL, &key->N, + LTC_ASN1_INTEGER, 1UL, &key->e, + LTC_ASN1_INTEGER, 1UL, &key->d, + LTC_ASN1_INTEGER, 1UL, &key->p, + LTC_ASN1_INTEGER, 1UL, &key->q, + LTC_ASN1_INTEGER, 1UL, &key->dP, + LTC_ASN1_INTEGER, 1UL, &key->dQ, + LTC_ASN1_INTEGER, 1UL, &key->qP, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + return err; + } + + /* clear zero and return */ + return CRYPT_OK; + } else { + /* public key */ + return der_encode_sequence_multi(out, outlen, + LTC_ASN1_INTEGER, 1UL, &key->N, + LTC_ASN1_INTEGER, 1UL, &key->e, + LTC_ASN1_EOL, 0UL, NULL); + } +} + +#endif /* MRSA */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_export.c,v $ */ +/* $Revision: 1.11 $ */ +/* $Date: 2005/06/04 01:42:48 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_exptmod.c b/libtomcrypt/src/pk/rsa/rsa_exptmod.c new file mode 100644 index 0000000..379404c --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_exptmod.c @@ -0,0 +1,115 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_exptmod.c + RSA PKCS exptmod, Tom St Denis +*/ + +#ifdef MRSA + +/** + Compute an RSA modular exponentiation + @param in The input data to send into RSA + @param inlen The length of the input (octets) + @param out [out] The destination + @param outlen [in/out] The max size and resulting size of the output + @param which Which exponent to use, e.g. PK_PRIVATE or PK_PUBLIC + @param key The RSA key to use + @return CRYPT_OK if successful +*/ +int rsa_exptmod(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, int which, + rsa_key *key) +{ + mp_int tmp, tmpa, tmpb; + unsigned long x; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* is the key of the right type for the operation? */ + if (which == PK_PRIVATE && (key->type != PK_PRIVATE)) { + return CRYPT_PK_NOT_PRIVATE; + } + + /* must be a private or public operation */ + if (which != PK_PRIVATE && which != PK_PUBLIC) { + return CRYPT_PK_INVALID_TYPE; + } + + /* init and copy into tmp */ + if ((err = mp_init_multi(&tmp, &tmpa, &tmpb, NULL)) != MP_OKAY) { return mpi_to_ltc_error(err); } + if ((err = mp_read_unsigned_bin(&tmp, (unsigned char *)in, (int)inlen)) != MP_OKAY) { goto error; } + + /* sanity check on the input */ + if (mp_cmp(&key->N, &tmp) == MP_LT) { + err = CRYPT_PK_INVALID_SIZE; + goto done; + } + + /* are we using the private exponent and is the key optimized? */ + if (which == PK_PRIVATE) { + /* tmpa = tmp^dP mod p */ + if ((err = mp_exptmod(&tmp, &key->dP, &key->p, &tmpa)) != MP_OKAY) { goto error; } + + /* tmpb = tmp^dQ mod q */ + if ((err = mp_exptmod(&tmp, &key->dQ, &key->q, &tmpb)) != MP_OKAY) { goto error; } + + /* tmp = (tmpa - tmpb) * qInv (mod p) */ + if ((err = mp_sub(&tmpa, &tmpb, &tmp)) != MP_OKAY) { goto error; } + if ((err = mp_mulmod(&tmp, &key->qP, &key->p, &tmp)) != MP_OKAY) { goto error; } + + /* tmp = tmpb + q * tmp */ + if ((err = mp_mul(&tmp, &key->q, &tmp)) != MP_OKAY) { goto error; } + if ((err = mp_add(&tmp, &tmpb, &tmp)) != MP_OKAY) { goto error; } + } else { + /* exptmod it */ + if ((err = mp_exptmod(&tmp, &key->e, &key->N, &tmp)) != MP_OKAY) { goto error; } + } + + /* read it back */ + x = (unsigned long)mp_unsigned_bin_size(&key->N); + if (x > *outlen) { + err = CRYPT_BUFFER_OVERFLOW; + goto done; + } + + /* this should never happen ... */ + if (mp_unsigned_bin_size(&tmp) > mp_unsigned_bin_size(&key->N)) { + err = CRYPT_ERROR; + goto done; + } + *outlen = x; + + /* convert it */ + zeromem(out, x); + if ((err = mp_to_unsigned_bin(&tmp, out+(x-mp_unsigned_bin_size(&tmp)))) != MP_OKAY) { goto error; } + + /* clean up and return */ + err = CRYPT_OK; + goto done; +error: + err = mpi_to_ltc_error(err); +done: + mp_clear_multi(&tmp, &tmpa, &tmpb, NULL); + return err; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_exptmod.c,v $ */ +/* $Revision: 1.4 $ */ +/* $Date: 2005/06/23 02:10:22 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_free.c b/libtomcrypt/src/pk/rsa/rsa_free.c new file mode 100644 index 0000000..69eeaec --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_free.c @@ -0,0 +1,35 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_free.c + Free an RSA key, Tom St Denis +*/ + +#ifdef MRSA + +/** + Free an RSA key from memory + @param key The RSA key to free +*/ +void rsa_free(rsa_key *key) +{ + LTC_ARGCHK(key != NULL); + mp_clear_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, + &key->qP, &key->p, &key->q, NULL); +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_free.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_import.c b/libtomcrypt/src/pk/rsa/rsa_import.c new file mode 100644 index 0000000..5706134 --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_import.c @@ -0,0 +1,92 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_import.c + Import a PKCS RSA key, Tom St Denis +*/ + +#ifdef MRSA + +/** + Import an RSAPublicKey or RSAPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1] + @param in The packet to import from + @param inlen It's length (octets) + @param key [out] Destination for newly imported key + @return CRYPT_OK if successful, upon error allocated memory is freed +*/ +int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key) +{ + int err; + mp_int zero; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(key != NULL); + + /* init key */ + if ((err = mp_init_multi(&zero, &key->e, &key->d, &key->N, &key->dQ, + &key->dP, &key->qP, &key->p, &key->q, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_INTEGER, 1UL, &key->N, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto LBL_ERR; + } + + if (mp_cmp_d(&key->N, 0) == MP_EQ) { + /* it's a private key */ + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_INTEGER, 1UL, &zero, + LTC_ASN1_INTEGER, 1UL, &key->N, + LTC_ASN1_INTEGER, 1UL, &key->e, + LTC_ASN1_INTEGER, 1UL, &key->d, + LTC_ASN1_INTEGER, 1UL, &key->p, + LTC_ASN1_INTEGER, 1UL, &key->q, + LTC_ASN1_INTEGER, 1UL, &key->dP, + LTC_ASN1_INTEGER, 1UL, &key->dQ, + LTC_ASN1_INTEGER, 1UL, &key->qP, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto LBL_ERR; + } + key->type = PK_PRIVATE; + } else if (mp_cmp_d(&key->N, 1) == MP_EQ) { + /* we don't support multi-prime RSA */ + err = CRYPT_PK_INVALID_TYPE; + goto LBL_ERR; + } else { + /* it's a public key and we lack e */ + if ((err = der_decode_sequence_multi(in, inlen, + LTC_ASN1_INTEGER, 1UL, &key->N, + LTC_ASN1_INTEGER, 1UL, &key->e, + LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { + goto LBL_ERR; + } + + /* free up some ram */ + mp_clear_multi(&key->p, &key->q, &key->qP, &key->dP, &key->dQ, NULL); + key->type = PK_PUBLIC; + } + return CRYPT_OK; +LBL_ERR: + mp_clear_multi(&zero, &key->d, &key->e, &key->N, &key->dQ, &key->dP, + &key->qP, &key->p, &key->q, NULL); + return err; +} + +#endif /* MRSA */ + + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_import.c,v $ */ +/* $Revision: 1.10 $ */ +/* $Date: 2005/06/03 18:48:28 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_make_key.c b/libtomcrypt/src/pk/rsa/rsa_make_key.c new file mode 100644 index 0000000..d874106 --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_make_key.c @@ -0,0 +1,125 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_make_key.c + RSA key generation, Tom St Denis +*/ + +#ifdef MRSA + +/** + Create an RSA key + @param prng An active PRNG state + @param wprng The index of the PRNG desired + @param size The size of the modulus (key size) desired (octets) + @param e The "e" value (public key). e==65537 is a good choice + @param key [out] Destination of a newly created private key pair + @return CRYPT_OK if successful, upon error all allocated ram is freed +*/ +int rsa_make_key(prng_state *prng, int wprng, int size, long e, rsa_key *key) +{ + mp_int p, q, tmp1, tmp2, tmp3; + int err; + + LTC_ARGCHK(key != NULL); + + if ((size < (MIN_RSA_SIZE/8)) || (size > (MAX_RSA_SIZE/8))) { + return CRYPT_INVALID_KEYSIZE; + } + + if ((e < 3) || ((e & 1) == 0)) { + return CRYPT_INVALID_ARG; + } + + if ((err = prng_is_valid(wprng)) != CRYPT_OK) { + return err; + } + + if ((err = mp_init_multi(&p, &q, &tmp1, &tmp2, &tmp3, NULL)) != MP_OKAY) { + return mpi_to_ltc_error(err); + } + + /* make primes p and q (optimization provided by Wayne Scott) */ + if ((err = mp_set_int(&tmp3, e)) != MP_OKAY) { goto error; } /* tmp3 = e */ + + /* make prime "p" */ + do { + if ((err = rand_prime(&p, size*4, prng, wprng)) != CRYPT_OK) { goto done; } + if ((err = mp_sub_d(&p, 1, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = p-1 */ + if ((err = mp_gcd(&tmp1, &tmp3, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = gcd(p-1, e) */ + } while (mp_cmp_d(&tmp2, 1) != 0); /* while e divides p-1 */ + + /* make prime "q" */ + do { + if ((err = rand_prime(&q, size*4, prng, wprng)) != CRYPT_OK) { goto done; } + if ((err = mp_sub_d(&q, 1, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = q-1 */ + if ((err = mp_gcd(&tmp1, &tmp3, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = gcd(q-1, e) */ + } while (mp_cmp_d(&tmp2, 1) != 0); /* while e divides q-1 */ + + /* tmp1 = lcm(p-1, q-1) */ + if ((err = mp_sub_d(&p, 1, &tmp2)) != MP_OKAY) { goto error; } /* tmp2 = p-1 */ + /* tmp1 = q-1 (previous do/while loop) */ + if ((err = mp_lcm(&tmp1, &tmp2, &tmp1)) != MP_OKAY) { goto error; } /* tmp1 = lcm(p-1, q-1) */ + + /* make key */ + if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, + &key->qP, &key->p, &key->q, NULL)) != MP_OKAY) { + goto error; + } + + if ((err = mp_set_int(&key->e, e)) != MP_OKAY) { goto error2; } /* key->e = e */ + if ((err = mp_invmod(&key->e, &tmp1, &key->d)) != MP_OKAY) { goto error2; } /* key->d = 1/e mod lcm(p-1,q-1) */ + if ((err = mp_mul(&p, &q, &key->N)) != MP_OKAY) { goto error2; } /* key->N = pq */ + + /* optimize for CRT now */ + /* find d mod q-1 and d mod p-1 */ + if ((err = mp_sub_d(&p, 1, &tmp1)) != MP_OKAY) { goto error2; } /* tmp1 = q-1 */ + if ((err = mp_sub_d(&q, 1, &tmp2)) != MP_OKAY) { goto error2; } /* tmp2 = p-1 */ + if ((err = mp_mod(&key->d, &tmp1, &key->dP)) != MP_OKAY) { goto error2; } /* dP = d mod p-1 */ + if ((err = mp_mod(&key->d, &tmp2, &key->dQ)) != MP_OKAY) { goto error2; } /* dQ = d mod q-1 */ + if ((err = mp_invmod(&q, &p, &key->qP)) != MP_OKAY) { goto error2; } /* qP = 1/q mod p */ + + if ((err = mp_copy(&p, &key->p)) != MP_OKAY) { goto error2; } + if ((err = mp_copy(&q, &key->q)) != MP_OKAY) { goto error2; } + + /* shrink ram required */ + if ((err = mp_shrink(&key->e)) != MP_OKAY) { goto error2; } + if ((err = mp_shrink(&key->d)) != MP_OKAY) { goto error2; } + if ((err = mp_shrink(&key->N)) != MP_OKAY) { goto error2; } + if ((err = mp_shrink(&key->dQ)) != MP_OKAY) { goto error2; } + if ((err = mp_shrink(&key->dP)) != MP_OKAY) { goto error2; } + if ((err = mp_shrink(&key->qP)) != MP_OKAY) { goto error2; } + if ((err = mp_shrink(&key->p)) != MP_OKAY) { goto error2; } + if ((err = mp_shrink(&key->q)) != MP_OKAY) { goto error2; } + + /* set key type (in this case it's CRT optimized) */ + key->type = PK_PRIVATE; + + /* return ok and free temps */ + err = CRYPT_OK; + goto done; +error2: + mp_clear_multi(&key->d, &key->e, &key->N, &key->dQ, &key->dP, + &key->qP, &key->p, &key->q, NULL); +error: + err = mpi_to_ltc_error(err); +done: + mp_clear_multi(&tmp3, &tmp2, &tmp1, &p, &q, NULL); + return err; +} + +#endif + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_make_key.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_sign_hash.c b/libtomcrypt/src/pk/rsa/rsa_sign_hash.c new file mode 100644 index 0000000..d31bda3 --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_sign_hash.c @@ -0,0 +1,79 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_sign_hash.c + RSA PKCS v2 PSS sign hash, Tom St Denis +*/ + +#ifdef MRSA + +/** + (PKCS #1, v2.0) PSS pad then sign + @param in The hash to sign + @param inlen The length of the hash to sign (octets) + @param out [out] The signature + @param outlen [in/out] The max size and resulting size of the signature + @param prng An active PRNG state + @param prng_idx The index of the PRNG desired + @param hash_idx The index of the hash desired + @param saltlen The length of the salt desired (octets) + @param key The private RSA key to use + @return CRYPT_OK if successful +*/ +int rsa_sign_hash(const unsigned char *in, unsigned long inlen, + unsigned char *out, unsigned long *outlen, + prng_state *prng, int prng_idx, + int hash_idx, unsigned long saltlen, + rsa_key *key) +{ + unsigned long modulus_bitlen, modulus_bytelen, x; + int err; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + LTC_ARGCHK(outlen != NULL); + LTC_ARGCHK(key != NULL); + + /* valid prng and hash ? */ + if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) { + return err; + } + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + + /* get modulus len in bits */ + modulus_bitlen = mp_count_bits(&(key->N)); + + /* outlen must be at least the size of the modulus */ + modulus_bytelen = mp_unsigned_bin_size(&(key->N)); + if (modulus_bytelen > *outlen) { + return CRYPT_BUFFER_OVERFLOW; + } + + /* PSS pad the key */ + x = *outlen; + if ((err = pkcs_1_pss_encode(in, inlen, saltlen, prng, prng_idx, + hash_idx, modulus_bitlen, out, &x)) != CRYPT_OK) { + return err; + } + + /* RSA encode it */ + return rsa_exptmod(out, x, out, outlen, PK_PRIVATE, key); +} + +#endif /* MRSA */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_sign_hash.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ diff --git a/libtomcrypt/src/pk/rsa/rsa_verify_hash.c b/libtomcrypt/src/pk/rsa/rsa_verify_hash.c new file mode 100644 index 0000000..690364d --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_verify_hash.c @@ -0,0 +1,86 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + * + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + */ +#include "tomcrypt.h" + +/** + @file rsa_verify_hash.c + RSA PKCS v2 PSS signature verification, Tom St Denis +*/ + +#ifdef MRSA + +/** + (PKCS #1, v2.0) de-sign then PSS depad + @param sig The signature data + @param siglen The length of the signature data (octets) + @param hash The hash of the message that was signed + @param hashlen The length of the hash of the message that was signed (octets) + @param hash_idx The index of the desired hash + @param saltlen The length of the salt used during signature + @param stat [out] The result of the signature comparison, 1==valid, 0==invalid + @param key The public RSA key corresponding to the key that performed the signature + @return CRYPT_OK on success (even if the signature is invalid) +*/ +int rsa_verify_hash(const unsigned char *sig, unsigned long siglen, + const unsigned char *hash, unsigned long hashlen, + int hash_idx, unsigned long saltlen, + int *stat, rsa_key *key) +{ + unsigned long modulus_bitlen, modulus_bytelen, x; + int err; + unsigned char *tmpbuf; + + LTC_ARGCHK(hash != NULL); + LTC_ARGCHK(sig != NULL); + LTC_ARGCHK(stat != NULL); + LTC_ARGCHK(key != NULL); + + /* default to invalid */ + *stat = 0; + + /* valid hash ? */ + if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) { + return err; + } + + /* get modulus len in bits */ + modulus_bitlen = mp_count_bits(&(key->N)); + + /* outlen must be at least the size of the modulus */ + modulus_bytelen = mp_unsigned_bin_size(&(key->N)); + if (modulus_bytelen != siglen) { + return CRYPT_INVALID_PACKET; + } + + /* allocate temp buffer for decoded sig */ + tmpbuf = XMALLOC(siglen); + if (tmpbuf == NULL) { + return CRYPT_MEM; + } + + /* RSA decode it */ + x = siglen; + if ((err = rsa_exptmod(sig, siglen, tmpbuf, &x, PK_PUBLIC, key)) != CRYPT_OK) { + XFREE(tmpbuf); + return err; + } + + /* PSS decode it */ + err = pkcs_1_pss_decode(hash, hashlen, tmpbuf, x, saltlen, hash_idx, modulus_bitlen, stat); + XFREE(tmpbuf); + return err; +} + +#endif /* MRSA */ + +/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_verify_hash.c,v $ */ +/* $Revision: 1.3 $ */ +/* $Date: 2005/05/05 14:35:59 $ */ |