Lines Matching refs:cbc
15 CBC implementation, encrypt block, Tom St Denis
22 CBC decrypt
26 @param cbc CBC state
29 int cbc_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CBC *cbc)
41 LTC_ARGCHK(cbc != NULL);
43 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
48 if (cbc->blocklen < 1 || cbc->blocklen > (int)sizeof(cbc->IV)) {
52 if (len % cbc->blocklen) {
56 if (cbc->blocklen % sizeof(LTC_FAST_TYPE)) {
61 if (cipher_descriptor[cbc->cipher].accel_cbc_decrypt != NULL) {
62 return cipher_descriptor[cbc->cipher].accel_cbc_decrypt(ct, pt, len / cbc->blocklen, cbc->IV, &cbc->key);
66 if ((err = cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key)) != CRYPT_OK) {
72 for (x = 0; x < cbc->blocklen; x += sizeof(LTC_FAST_TYPE)) {
73 tmpy = *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) ^ *((LTC_FAST_TYPE*)((unsigned char *)tmp + x));
74 *((LTC_FAST_TYPE*)((unsigned char *)cbc->IV + x)) = *((LTC_FAST_TYPE*)((unsigned char *)ct + x));
78 for (x = 0; x < cbc->blocklen; x++) {
79 tmpy = tmp[x] ^ cbc->IV[x];
80 cbc->IV[x] = ct[x];
85 ct += cbc->blocklen;
86 pt += cbc->blocklen;
87 len -= cbc->blocklen;
95 /* $Source: /cvs/libtom/libtomcrypt/src/modes/cbc/cbc_decrypt.c,v $ */
