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comparison src/modes/ofb/ofb_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 ofb_setiv.c
15 OFB implementation, set IV, Tom St Denis
16 */
17
18 #ifdef OFB
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 ofb The OFB state
25 @return CRYPT_OK if successful
26 */
27 int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb)
28 {
29 int err;
30
31 LTC_ARGCHK(IV != NULL);
32 LTC_ARGCHK(ofb != NULL);
33
34 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
35 return err;
36 }
37
38 if (len != (unsigned long)ofb->blocklen) {
39 return CRYPT_INVALID_ARG;
40 }
41
42 /* force next block */
43 ofb->padlen = 0;
44 cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key);
45 return CRYPT_OK;
46 }
47
48 #endif
49