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/* 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
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