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comparison src/modes/lrw/lrw_decrypt.c @ 381:999a5eb4ed10 libtomcrypt-dropbear

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propagate from branch 'au.asn.ucc.matt.ltc.orig' (head 52840647ac7f5c707c3bd158d119a15734a7ef28) to branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 02:39:21 +0000
parents d5faf4814ddb
children
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281:997e6f7dc01e 381:999a5eb4ed10
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.com
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file lrw_decrypt.c
15 LRW_MODE implementation, Decrypt blocks, Tom St Denis
16 */
17
18 #ifdef LTC_LRW_MODE
19
20 /**
21 LRW decrypt blocks
22 @param ct The ciphertext
23 @param pt [out] The plaintext
24 @param len The length in octets, must be a multiple of 16
25 @param lrw The LRW state
26 */
27 int lrw_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_LRW *lrw)
28 {
29 int err;
30
31 LTC_ARGCHK(pt != NULL);
32 LTC_ARGCHK(ct != NULL);
33 LTC_ARGCHK(lrw != NULL);
34
35 if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) {
36 return err;
37 }
38
39 if (cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) {
40 return cipher_descriptor[lrw->cipher].accel_lrw_decrypt(ct, pt, len, lrw->IV, lrw->tweak, &lrw->key);
41 }
42
43 return lrw_process(ct, pt, len, LRW_DECRYPT, lrw);
44 }
45
46
47 #endif
48
49 /* $Source: /cvs/libtom/libtomcrypt/src/modes/lrw/lrw_decrypt.c,v $ */
50 /* $Revision: 1.8 $ */
51 /* $Date: 2006/06/29 01:53:13 $ */