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annotate ocb_decrypt_verify_memory.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 5d99163f7e32
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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
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12 /* OCB Implementation by Tom St Denis */
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13 #include "mycrypt.h"
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14
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15 #ifdef OCB_MODE
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16
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17 int ocb_decrypt_verify_memory(int cipher,
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18 const unsigned char *key, unsigned long keylen,
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19 const unsigned char *nonce,
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20 const unsigned char *ct, unsigned long ctlen,
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21 unsigned char *pt,
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22 const unsigned char *tag, unsigned long taglen,
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23 int *res)
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24 {
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25 int err;
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26 ocb_state ocb;
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27
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28
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29 _ARGCHK(key != NULL);
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30 _ARGCHK(nonce != NULL);
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31 _ARGCHK(pt != NULL);
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32 _ARGCHK(ct != NULL);
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33 _ARGCHK(tag != NULL);
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34 _ARGCHK(res != NULL);
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35
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36 if ((err = ocb_init(&ocb, cipher, key, keylen, nonce)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 while (ctlen > (unsigned long)ocb.block_len) {
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41 if ((err = ocb_decrypt(&ocb, ct, pt)) != CRYPT_OK) {
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42 return err;
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43 }
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44 ctlen -= ocb.block_len;
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45 pt += ocb.block_len;
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46 ct += ocb.block_len;
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47 }
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48
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49 return ocb_done_decrypt(&ocb, ct, ctlen, pt, tag, taglen, res);
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50 }
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51
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52 #endif