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comparison src/modes/ecb/ecb_decrypt.c @ 191:1c15b283127b libtomcrypt-orig

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Import of libtomcrypt 1.02 with manual path rename rearrangement etc
author Matt Johnston <matt@ucc.asn.au>
date Fri, 06 May 2005 13:23:02 +0000
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children 39d5d58461d6
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143:5d99163f7e32 191:1c15b283127b
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
2 *
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
5 *
6 * The library is free for all purposes without any express
7 * guarantee it works.
8 *
9 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file ecb_decrypt.c
15 ECB implementation, decrypt a block, Tom St Denis
16 */
17
18 #ifdef ECB
19
20 /**
21 ECB decrypt
22 @param ct Ciphertext
23 @param pt [out] Plaintext
24 @param len The number of octets to process (must be multiple of the cipher block size)
25 @param ecb ECB state
26 @return CRYPT_OK if successful
27 */
28 int ecb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_ECB *ecb)
29 {
30 int err;
31 LTC_ARGCHK(pt != NULL);
32 LTC_ARGCHK(ct != NULL);
33 LTC_ARGCHK(ecb != NULL);
34 if ((err = cipher_is_valid(ecb->cipher)) != CRYPT_OK) {
35 return err;
36 }
37 if (len % cipher_descriptor[ecb->cipher].block_length) {
38 return CRYPT_INVALID_ARG;
39 }
40
41 /* check for accel */
42 if (cipher_descriptor[ecb->cipher].accel_ecb_decrypt != NULL) {
43 cipher_descriptor[ecb->cipher].accel_ecb_decrypt(ct, pt, len / cipher_descriptor[ecb->cipher].block_length, &ecb->key);
44 } else {
45 while (len) {
46 cipher_descriptor[ecb->cipher].ecb_decrypt(ct, pt, &ecb->key);
47 pt += cipher_descriptor[ecb->cipher].block_length;
48 ct += cipher_descriptor[ecb->cipher].block_length;
49 len -= cipher_descriptor[ecb->cipher].block_length;
50 }
51 }
52 return CRYPT_OK;
53 }
54
55 #endif