Mercurial > dropbear

annotate libtomcrypt/src/modes/ctr/ctr_getiv.c @ 310:4b4478d0d2b9 ucc-axis-hack

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add a comment on usage
author Matt Johnston <matt@ucc.asn.au>
date Sun, 26 Mar 2006 08:28:16 +0000
parents 1b9e69c058d2
children 0cbe8f6dbf9e
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
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2 *
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3 * LibTomCrypt is a library that provides various cryptographic
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4 * algorithms in a highly modular and flexible manner.
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5 *
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6 * The library is free for all purposes without any express
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7 * guarantee it works.
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8 *
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9 * Tom St Denis, [email protected], http://libtomcrypt.org
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10 */
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11 #include "tomcrypt.h"
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12
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13 /**
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14 @file ctr_getiv.c
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15 CTR implementation, get IV, Tom St Denis
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16 */
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18 #ifdef CTR
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19
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20 /**
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21 Get the current initial vector
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22 @param IV [out] The destination of the initial vector
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23 @param len [in/out] The max size and resulting size of the initial vector
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24 @param ctr The CTR state
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25 @return CRYPT_OK if successful
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26 */
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27 int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr)
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28 {
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29 LTC_ARGCHK(IV != NULL);
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30 LTC_ARGCHK(len != NULL);
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31 LTC_ARGCHK(ctr != NULL);
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32 if ((unsigned long)ctr->blocklen > *len) {
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33 return CRYPT_BUFFER_OVERFLOW;
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34 }
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35 XMEMCPY(IV, ctr->ctr, ctr->blocklen);
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36 *len = ctr->blocklen;
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38 return CRYPT_OK;
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39 }
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41 #endif
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43 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_getiv.c,v $ */
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44 /* $Revision: 1.3 $ */
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45 /* $Date: 2005/05/05 14:35:59 $ */