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 */
ctr_getiv(unsigned char * IV,unsigned long * len,symmetric_CTR * ctr)27 int 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