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comparison libtomcrypt/src/modes/ctr/ctr_setiv.c @ 389:5ff8218bcee9

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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 2af95f00ebd5bb7a28b3817db1218442c935388e) to branch 'au.asn.ucc.matt.dropbear' (head ecd779509ef23a8cdf64888904fc9b31d78aa933)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 11 Jan 2007 03:14:55 +0000
parents 0cbe8f6dbf9e
children f849a5ca2efc
comparison
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388:fb54020f78e1 389:5ff8218bcee9
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 ctr_setiv.c
15 CTR implementation, set IV, Tom St Denis
16 */
17
18 #ifdef LTC_CTR_MODE
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 return cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
49 }
50
51 #endif
52
53
54 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_setiv.c,v $ */
55 /* $Revision: 1.6 $ */
56 /* $Date: 2006/06/29 01:46:46 $ */