Mercurial > dropbear

annotate libtomcrypt/src/modes/ofb/ofb_setiv.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 ofb_setiv.c
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15 OFB implementation, set IV, Tom St Denis
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16 */
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18 #ifdef OFB
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19
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20 /**
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21 Set an initial vector
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22 @param IV The initial vector
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23 @param len The length of the vector (in octets)
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24 @param ofb The OFB state
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25 @return CRYPT_OK if successful
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26 */
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27 int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb)
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28 {
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29 int err;
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30
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31 LTC_ARGCHK(IV != NULL);
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32 LTC_ARGCHK(ofb != NULL);
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33
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34 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
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35 return err;
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36 }
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37
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38 if (len != (unsigned long)ofb->blocklen) {
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39 return CRYPT_INVALID_ARG;
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40 }
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42 /* force next block */
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43 ofb->padlen = 0;
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44 cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key);
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45 return CRYPT_OK;
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46 }
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47
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48 #endif
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50
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51 /* $Source: /cvs/libtom/libtomcrypt/src/modes/ofb/ofb_setiv.c,v $ */
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52 /* $Revision: 1.3 $ */
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53 /* $Date: 2005/05/05 14:35:59 $ */