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annotate ofb_start.c @ 18:712dd6dfb0eb libtomcrypt

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makefile
author Matt Johnston <matt@ucc.asn.au>
date Tue, 15 Jun 2004 14:34:07 +0000
parents d7da3b1e1540
children
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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 "mycrypt.h"
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12
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13 #ifdef OFB
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14
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15 int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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16 int keylen, int num_rounds, symmetric_OFB *ofb)
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17 {
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18 int x, err;
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19
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20 _ARGCHK(IV != NULL);
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21 _ARGCHK(key != NULL);
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22 _ARGCHK(ofb != NULL);
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23
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24 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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25 return err;
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26 }
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27
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28 /* copy details */
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29 ofb->cipher = cipher;
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30 ofb->blocklen = cipher_descriptor[cipher].block_length;
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31 for (x = 0; x < ofb->blocklen; x++) {
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32 ofb->IV[x] = IV[x];
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33 }
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34
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35 /* init the cipher */
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36 ofb->padlen = ofb->blocklen;
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37 return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key);
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38 }
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39
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40 #endif