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annotate ctr_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 CTR
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14
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15 int ctr_start(int cipher, const unsigned char *count, const unsigned char *key, int keylen,
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16 int num_rounds, symmetric_CTR *ctr)
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17 {
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18 int x, err;
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19
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20 _ARGCHK(count != NULL);
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21 _ARGCHK(key != NULL);
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22 _ARGCHK(ctr != 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, &ctr->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 ctr */
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35 ctr->blocklen = cipher_descriptor[cipher].block_length;
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36 ctr->cipher = cipher;
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37 ctr->padlen = 0;
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38 ctr->mode = 0;
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39 for (x = 0; x < ctr->blocklen; x++) {
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40 ctr->ctr[x] = count[x];
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41 }
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42 cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);
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43 return CRYPT_OK;
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44 }
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45
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46 #endif