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annotate ofb_encrypt.c @ 164:cd1143579f00 libtomcrypt LTC_DB_0.44

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mpi.c isn't needed if we're using libtommath seperately
author Matt Johnston <matt@ucc.asn.au>
date Sun, 02 Jan 2005 17:19:46 +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_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb)
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16 {
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17 int err;
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18 _ARGCHK(pt != NULL);
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19 _ARGCHK(ct != NULL);
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20 _ARGCHK(ofb != NULL);
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21 if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {
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22 return err;
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23 }
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24
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25 /* is blocklen/padlen valid? */
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26 if (ofb->blocklen < 0 || ofb->blocklen > (int)sizeof(ofb->IV) ||
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27 ofb->padlen < 0 || ofb->padlen > (int)sizeof(ofb->IV)) {
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28 return CRYPT_INVALID_ARG;
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29 }
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30
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31 while (len-- > 0) {
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32 if (ofb->padlen == ofb->blocklen) {
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33 cipher_descriptor[ofb->cipher].ecb_encrypt(ofb->IV, ofb->IV, &ofb->key);
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34 ofb->padlen = 0;
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35 }
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36 *ct++ = *pt++ ^ ofb->IV[ofb->padlen++];
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37 }
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38 return CRYPT_OK;
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39 }
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40
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41 #endif