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annotate eax_done.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 /* EAX Implementation by Tom St Denis */
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13 #include "mycrypt.h"
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14
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15 #ifdef EAX_MODE
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16
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17 int eax_done(eax_state *eax, unsigned char *tag, unsigned long *taglen)
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18 {
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19 int err;
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20 unsigned char headermac[MAXBLOCKSIZE], ctmac[MAXBLOCKSIZE];
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21 unsigned long x, len;
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22
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23 _ARGCHK(eax != NULL);
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24 _ARGCHK(tag != NULL);
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25 _ARGCHK(taglen != NULL);
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26
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27 /* finish ctomac */
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28 len = sizeof(ctmac);
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29 if ((err = omac_done(&eax->ctomac, ctmac, &len)) != CRYPT_OK) {
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30 return err;
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31 }
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32
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33 /* finish headeromac */
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34
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35 /* note we specifically don't reset len so the two lens are minimal */
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36
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37 if ((err = omac_done(&eax->headeromac, headermac, &len)) != CRYPT_OK) {
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38 return err;
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39 }
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40
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41 /* compute N xor H xor C */
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42 for (x = 0; x < len && x < *taglen; x++) {
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43 tag[x] = eax->N[x] ^ headermac[x] ^ ctmac[x];
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44 }
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45 *taglen = x;
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46
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47 #ifdef CLEAN_STACK
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48 zeromem(ctmac, sizeof(ctmac));
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49 zeromem(headermac, sizeof(headermac));
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50 zeromem(eax, sizeof(*eax));
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51 #endif
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52
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53 return CRYPT_OK;
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54 }
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55
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56 #endif