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comparison src/modes/ctr/ctr_setiv.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 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