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*/
27int 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