Mercurial > dropbear

comparison libtomcrypt/src/modes/ctr/ctr_setiv.c @ 285:1b9e69c058d2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents
children 0cbe8f6dbf9e
comparison
equal deleted inserted replaced
281:997e6f7dc01e 285:1b9e69c058d2
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 ctr_setiv.c
15 CTR implementation, set IV, Tom St Denis
16 */
17
18 #ifdef CTR
19
20 /**
21 Set an initial vector
22 @param IV The initial vector
23 @param len The length of the vector (in octets)
24 @param ctr The CTR state
25 @return CRYPT_OK if successful
26 */
27 int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
28 {
29 int err;
30
31 LTC_ARGCHK(IV != NULL);
32 LTC_ARGCHK(ctr != NULL);
33
34 /* bad param? */
35 if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
36 return err;
37 }
38
39 if (len != (unsigned long)ctr->blocklen) {
40 return CRYPT_INVALID_ARG;
41 }
42
43 /* set IV */
44 XMEMCPY(ctr->ctr, IV, len);
45
46 /* force next block */
47 ctr->padlen = 0;
48 cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
49
50 return CRYPT_OK;
51 }
52
53 #endif
54
55
56 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_setiv.c,v $ */
57 /* $Revision: 1.3 $ */
58 /* $Date: 2005/05/05 14:35:59 $ */