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annotate ocb_done_decrypt.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
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_done_decrypt(ocb_state *ocb,
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18 const unsigned char *ct, unsigned long ctlen,
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19 unsigned char *pt,
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20 const unsigned char *tag, unsigned long taglen, int *res)
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21 {
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22 int err;
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23 unsigned char tagbuf[MAXBLOCKSIZE];
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24 unsigned long tagbuflen;
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25
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26 _ARGCHK(ocb != NULL);
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27 _ARGCHK(pt != NULL);
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28 _ARGCHK(ct != NULL);
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29 _ARGCHK(tag != NULL);
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30 _ARGCHK(res != NULL);
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31
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32 *res = 0;
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33
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34 tagbuflen = sizeof(tagbuf);
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35 if ((err = __ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) {
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36 return err;
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37 }
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38
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39 if (taglen <= tagbuflen && memcmp(tagbuf, tag, taglen) == 0) {
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40 *res = 1;
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41 }
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42
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43 #ifdef CLEAN_STACK
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44 zeromem(tagbuf, sizeof(tagbuf));
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45 #endif
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46
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47 return CRYPT_OK;
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48 }
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49
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50 #endif
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51