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annotate cfb_start.c @ 125:d16fc1b2223d libtomcrypt

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merge of 8231809d2509aa54773443786e3123766438d924 and e30f886c9c14efb01f49297b3fb6b97c8868fd88
author Matt Johnston <matt@ucc.asn.au>
date Tue, 14 Sep 2004 13:28:31 +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 CFB
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14
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15 int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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16 int keylen, int num_rounds, symmetric_CFB *cfb)
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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(cfb != 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
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29 /* copy data */
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30 cfb->cipher = cipher;
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31 cfb->blocklen = cipher_descriptor[cipher].block_length;
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32 for (x = 0; x < cfb->blocklen; x++)
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33 cfb->IV[x] = IV[x];
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34
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35 /* init the cipher */
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36 if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cfb->key)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 /* encrypt the IV */
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41 cipher_descriptor[cfb->cipher].ecb_encrypt(cfb->IV, cfb->IV, &cfb->key);
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42 cfb->padlen = 0;
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43
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44 return CRYPT_OK;
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45 }
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46
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47 #endif