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 ctr_getiv.c
15   CTR implementation, get IV, Tom St Denis
16*/
17
18#ifdef LTC_CTR_MODE
19
20/**
21   Get the current initial vector
22   @param IV   [out] The destination of the initial vector
23   @param len  [in/out]  The max size and resulting size of the initial vector
24   @param ctr  The CTR state
25   @return CRYPT_OK if successful
26*/
27int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr)
28{
29   LTC_ARGCHK(IV  != NULL);
30   LTC_ARGCHK(len != NULL);
31   LTC_ARGCHK(ctr != NULL);
32   if ((unsigned long)ctr->blocklen > *len) {
33      *len = ctr->blocklen;
34      return CRYPT_BUFFER_OVERFLOW;
35   }
36   XMEMCPY(IV, ctr->ctr, ctr->blocklen);
37   *len = ctr->blocklen;
38
39   return CRYPT_OK;
40}
41
42#endif
43
44/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_getiv.c,v $ */
45/* $Revision: 1.6 $ */
46/* $Date: 2006/06/29 01:46:46 $ */
47