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annotate cbc_encrypt.c @ 211:f01f0400314d libtomcrypt

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disapproval of revision 6a39eb8b36778460fca83b8149df2a8b6d3327fd
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 13:23:45 +0000
parents d7da3b1e1540
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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_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_CBC *cbc)
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16 {
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17 int x, err;
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18 unsigned char tmp[MAXBLOCKSIZE];
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19
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20 _ARGCHK(pt != NULL);
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21 _ARGCHK(ct != NULL);
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22 _ARGCHK(cbc != NULL);
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23
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24 if ((err = cipher_is_valid(cbc->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 /* is blocklen valid? */
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29 if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) {
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30 return CRYPT_INVALID_ARG;
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31 }
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32
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33 /* xor IV against plaintext */
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34 for (x = 0; x < cbc->blocklen; x++) {
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35 tmp[x] = pt[x] ^ cbc->IV[x];
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36 }
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37
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38 /* encrypt */
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39 cipher_descriptor[cbc->cipher].ecb_encrypt(tmp, ct, &cbc->key);
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40
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41 /* store IV [ciphertext] for a future block */
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42 for (x = 0; x < cbc->blocklen; x++) {
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43 cbc->IV[x] = ct[x];
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44 }
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45
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46 #ifdef CLEAN_STACK
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47 zeromem(tmp, sizeof(tmp));
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48 #endif
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49 return CRYPT_OK;
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50 }
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51
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52 #endif