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annotate cbc_start.c @ 144:7ed585a2c53b libtomcrypt

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propagate of 3f8f752126017cbe7d93c4086c27a91550df745f and 747ebf284d40a15b338e5a5c7730ecec6eade3d7 from branch 'au.asn.ucc.matt.ltc-orig' to 'au.asn.ucc.matt.ltc-db'
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:47:33 +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 CBC
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14
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15 int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key,
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16 int keylen, int num_rounds, symmetric_CBC *cbc)
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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(cbc != NULL);
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23
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24 /* bad param? */
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25 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
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26 return err;
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27 }
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28
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29 /* setup cipher */
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30 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cbc->key)) != CRYPT_OK) {
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31 return err;
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32 }
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33
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34 /* copy IV */
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35 cbc->blocklen = cipher_descriptor[cipher].block_length;
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36 cbc->cipher = cipher;
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37 for (x = 0; x < cbc->blocklen; x++) {
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38 cbc->IV[x] = IV[x];
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39 }
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40 return CRYPT_OK;
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41 }
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42
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43 #endif