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comparison libtomcrypt/src/modes/ctr/ctr_setiv.c @ 297:79bf1023cf11 agent-client

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propagate from branch 'au.asn.ucc.matt.dropbear' (head 0501e6f661b5415eb76f3b312d183c3adfbfb712) to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 01038174ec27245b51bd43a66c01ad930880f67b)
author Matt Johnston <matt@ucc.asn.au>
date Tue, 21 Mar 2006 16:20:59 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
comparison
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225:ca7e76d981d9 297:79bf1023cf11
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 $ */