annotate ofb_setiv.c @ 143:5d99163f7e32 libtomcrypt-orig

import of libtomcrypt 0.99
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:34:45 +0000
parents 6362d3854bb4
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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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12 #include "mycrypt.h"
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14 #ifdef OFB
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16 int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb)
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17 {
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18 int err;
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20 _ARGCHK(IV != NULL);
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21 _ARGCHK(ofb != NULL);
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23 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
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24 return err;
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25 }
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27 if (len != (unsigned long)ofb->blocklen) {
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28 return CRYPT_INVALID_ARG;
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29 }
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31 /* force next block */
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32 ofb->padlen = 0;
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33 cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key);
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34 return CRYPT_OK;
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35 }
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37 #endif
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