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comparison cbc_decrypt.c @ 15:6362d3854bb4 libtomcrypt-orig

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0.96 release of LibTomCrypt
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:07:21 +0000
parents 7faae8f46238
children
comparison
equal deleted inserted replaced
3:7faae8f46238 15:6362d3854bb4
23 23
24 /* decrypt the block from ct into tmp */ 24 /* decrypt the block from ct into tmp */
25 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) { 25 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
26 return err; 26 return err;
27 } 27 }
28 cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key); 28 _ARGCHK(cipher_descriptor[cbc->cipher].ecb_decrypt != NULL);
29 29
30 /* is blocklen valid? */ 30 /* is blocklen valid? */
31 if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) { 31 if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) {
32 return CRYPT_INVALID_ARG; 32 return CRYPT_INVALID_ARG;
33 } 33 }
34 34
35 /* xor IV against the plaintext of the previous step */ 35 /* decrypt and xor IV against the plaintext of the previous step */
36 cipher_descriptor[cbc->cipher].ecb_decrypt(ct, tmp, &cbc->key);
36 for (x = 0; x < cbc->blocklen; x++) { 37 for (x = 0; x < cbc->blocklen; x++) {
37 /* copy CT in case ct == pt */ 38 /* copy CT in case ct == pt */
38 tmp2[x] = ct[x]; 39 tmp2[x] = ct[x];
39 40
40 /* actually decrypt the byte */ 41 /* actually decrypt the byte */