diff options
Diffstat (limited to 'libtomcrypt/src/modes/cbc/cbc_decrypt.c')
| -rw-r--r-- | libtomcrypt/src/modes/cbc/cbc_decrypt.c | 32 |
1 files changed, 17 insertions, 15 deletions
diff --git a/libtomcrypt/src/modes/cbc/cbc_decrypt.c b/libtomcrypt/src/modes/cbc/cbc_decrypt.c index fc3fdd5..d768d88 100644 --- a/libtomcrypt/src/modes/cbc/cbc_decrypt.c +++ b/libtomcrypt/src/modes/cbc/cbc_decrypt.c @@ -6,7 +6,7 @@ * The library is free for all purposes without any express * guarantee it works. * - * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org + * Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.com */ #include "tomcrypt.h" @@ -16,7 +16,7 @@ */ -#ifdef CBC +#ifdef LTC_CBC_MODE /** CBC decrypt @@ -45,7 +45,7 @@ int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, s } /* is blocklen valid? */ - if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) { + if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) { return CRYPT_INVALID_ARG; } @@ -53,32 +53,34 @@ int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, s return CRYPT_INVALID_ARG; } #ifdef LTC_FAST - if (len % sizeof(LTC_FAST_TYPE)) { + if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) { return CRYPT_INVALID_ARG; } #endif if (cipher_descriptor[cbc->cipher].accel_cbc_decrypt != NULL) { - cipher_descriptor[cbc->cipher].accel_cbc_decrypt(ct, pt, len / cbc->blocklen, cbc->IV, &cbc->key); + return cipher_descriptor[cbc->cipher].accel_cbc_decrypt(ct, pt, len / cbc->blocklen, cbc->IV, &cbc->key); } else { while (len) { /* decrypt */ - cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key); + if ((err = cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key)) != CRYPT_OK) { + return err; + } /* xor IV against plaintext */ #if defined(LTC_FAST) - for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { - tmpy = *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^ *((LTC_FAST_TYPE*)((unsigned char *)tmp + x)); - *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x)); - *((LTC_FAST_TYPE*)((unsigned char *)pt + x)) = tmpy; - } - #else + for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) { + tmpy = *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^ *((LTC_FAST_TYPE*)((unsigned char *)tmp + x)); + *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x)); + *((LTC_FAST_TYPE*)((unsigned char *)pt + x)) = tmpy; + } + #else for (x = 0; x < cbc->blocklen; x++) { tmpy = tmp[x] ^ cbc->IV[x]; cbc->IV[x] = ct[x]; pt[x] = tmpy; } - #endif + #endif ct += cbc->blocklen; pt += cbc->blocklen; @@ -91,5 +93,5 @@ int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, s #endif /* $Source: /cvs/libtom/libtomcrypt/src/modes/cbc/cbc_decrypt.c,v $ */ -/* $Revision: 1.9 $ */ -/* $Date: 2005/05/05 14:35:59 $ */ +/* $Revision: 1.15 $ */ +/* $Date: 2006/11/21 00:18:23 $ */ |