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comparison src/modes/ctr/ctr_getiv.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 ctr_getiv.c
15 CTR implementation, get IV, Tom St Denis
16 */
17
18 #ifdef CTR
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 */
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 return CRYPT_BUFFER_OVERFLOW;
34 }
35 XMEMCPY(IV, ctr->ctr, ctr->blocklen);
36 *len = ctr->blocklen;
37
38 return CRYPT_OK;
39 }
40
41 #endif