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, tomstdenis@gmail.com, http://libtomcrypt.com
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file ofb_setiv.c
15 OFB implementation, set IV, Tom St Denis
16 */
17
18 #ifdef LTC_OFB_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 ofb The OFB state
25 @return CRYPT_OK if successful
26 */
ofb_setiv(const unsigned char * IV,unsigned long len,symmetric_OFB * ofb)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 return cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key);
45 }
46
47 #endif
48
49
50 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_setiv.c,v $ */
51 /* $Revision: 1.6 $ */
52 /* $Date: 2006/06/29 01:51:34 $ */
53