diff options
| author | Matt Johnston <matt@ucc.asn.au> | 2018-02-09 21:44:05 +0800 |
|---|---|---|
| committer | Matt Johnston <matt@ucc.asn.au> | 2018-02-09 21:44:05 +0800 |
| commit | 4f2eb1914bdac3ed3ee504ad86061281dbe0d074 (patch) | |
| tree | 078293375c3f3ee2d485cf9559a08d65d460786a /libtomcrypt/src/stream/rc4 | |
| parent | d72f50ff3284e15124a0f233c26339229fe305ac (diff) | |
Update to libtomcrypt 1.18.1, merged with Dropbear changes
Diffstat (limited to 'libtomcrypt/src/stream/rc4')
| -rw-r--r-- | libtomcrypt/src/stream/rc4/rc4_stream.c | 111 | ||||
| -rw-r--r-- | libtomcrypt/src/stream/rc4/rc4_test.c | 39 |
2 files changed, 150 insertions, 0 deletions
diff --git a/libtomcrypt/src/stream/rc4/rc4_stream.c b/libtomcrypt/src/stream/rc4/rc4_stream.c new file mode 100644 index 0000000..178489d --- /dev/null +++ b/libtomcrypt/src/stream/rc4/rc4_stream.c @@ -0,0 +1,111 @@ +/* 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. + */ + +#include "tomcrypt.h" + +#ifdef LTC_RC4_STREAM + +/** + Initialize an RC4 context (only the key) + @param st [out] The destination of the RC4 state + @param key The secret key + @param keylen The length of the secret key (8 - 256 bytes) + @return CRYPT_OK if successful +*/ +int rc4_stream_setup(rc4_state *st, const unsigned char *key, unsigned long keylen) +{ + unsigned char tmp, *s; + int x, y; + unsigned long j; + + LTC_ARGCHK(st != NULL); + LTC_ARGCHK(key != NULL); + LTC_ARGCHK(keylen >= 5); /* 40-2048 bits */ + + s = st->buf; + for (x = 0; x < 256; x++) { + s[x] = x; + } + + for (j = x = y = 0; x < 256; x++) { + y = (y + s[x] + key[j++]) & 255; + if (j == keylen) { + j = 0; + } + tmp = s[x]; s[x] = s[y]; s[y] = tmp; + } + st->x = 0; + st->y = 0; + + return CRYPT_OK; +} + +/** + Encrypt (or decrypt) bytes of ciphertext (or plaintext) with RC4 + @param st The RC4 state + @param in The plaintext (or ciphertext) + @param inlen The length of the input (octets) + @param out [out] The ciphertext (or plaintext), length inlen + @return CRYPT_OK if successful +*/ +int rc4_stream_crypt(rc4_state *st, const unsigned char *in, unsigned long inlen, unsigned char *out) +{ + unsigned char x, y, *s, tmp; + + LTC_ARGCHK(st != NULL); + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(out != NULL); + + x = st->x; + y = st->y; + s = st->buf; + while (inlen--) { + x = (x + 1) & 255; + y = (y + s[x]) & 255; + tmp = s[x]; s[x] = s[y]; s[y] = tmp; + tmp = (s[x] + s[y]) & 255; + *out++ = *in++ ^ s[tmp]; + } + st->x = x; + st->y = y; + return CRYPT_OK; +} + +/** + Generate a stream of random bytes via RC4 + @param st The RC420 state + @param out [out] The output buffer + @param outlen The output length + @return CRYPT_OK on success + */ +int rc4_stream_keystream(rc4_state *st, unsigned char *out, unsigned long outlen) +{ + if (outlen == 0) return CRYPT_OK; /* nothing to do */ + LTC_ARGCHK(out != NULL); + XMEMSET(out, 0, outlen); + return rc4_stream_crypt(st, out, outlen, out); +} + +/** + Terminate and clear RC4 state + @param st The RC4 state + @return CRYPT_OK on success +*/ +int rc4_stream_done(rc4_state *st) +{ + LTC_ARGCHK(st != NULL); + XMEMSET(st, 0, sizeof(rc4_state)); + return CRYPT_OK; +} + +#endif + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */ diff --git a/libtomcrypt/src/stream/rc4/rc4_test.c b/libtomcrypt/src/stream/rc4/rc4_test.c new file mode 100644 index 0000000..a7e4887 --- /dev/null +++ b/libtomcrypt/src/stream/rc4/rc4_test.c @@ -0,0 +1,39 @@ +/* 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. + */ + +#include "tomcrypt.h" + +#ifdef LTC_RC4_STREAM + +int rc4_stream_test(void) +{ +#ifndef LTC_TEST + return CRYPT_NOP; +#else + rc4_state st; + int err; + const unsigned char key[] = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef }; + const unsigned char pt[] = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef }; + const unsigned char ct[] = { 0x75, 0xb7, 0x87, 0x80, 0x99, 0xe0, 0xc5, 0x96 }; + unsigned char buf[10]; + + if ((err = rc4_stream_setup(&st, key, sizeof(key))) != CRYPT_OK) return err; + if ((err = rc4_stream_crypt(&st, pt, sizeof(pt), buf)) != CRYPT_OK) return err; + if (compare_testvector(buf, sizeof(ct), ct, sizeof(ct), "RC4", 0)) return CRYPT_FAIL_TESTVECTOR; + if ((err = rc4_stream_done(&st)) != CRYPT_OK) return err; + + return CRYPT_OK; +#endif +} + +#endif + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */ |