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annotate eax_decrypt_verify_memory.c @ 0:d7da3b1e1540 libtomcrypt

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put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
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children 5d99163f7e32
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d7da3b1e1540 put back the 0.95 makefile which was inadvertently merged over
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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_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, unsigned long noncelen,
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20 const unsigned char *header, unsigned long headerlen,
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21 const unsigned char *ct, unsigned long ctlen,
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22 unsigned char *pt,
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23 unsigned char *tag, unsigned long taglen,
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24 int *res)
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25 {
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26 int err;
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27 eax_state eax;
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28 unsigned char buf[MAXBLOCKSIZE];
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29 unsigned long buflen;
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30
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31 _ARGCHK(res != NULL);
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32
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33 /* default to zero */
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34 *res = 0;
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35
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36 if ((err = eax_init(&eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
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37 return err;
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38 }
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39
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40 if ((err = eax_decrypt(&eax, ct, pt, ctlen)) != CRYPT_OK) {
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41 return err;
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42 }
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43
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44 buflen = MIN(sizeof(buf), taglen);
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45 if ((err = eax_done(&eax, buf, &buflen)) != CRYPT_OK) {
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46 return err;
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47 }
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48
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49 /* compare tags */
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50 if (buflen >= taglen && memcmp(buf, tag, taglen) == 0) {
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51 *res = 1;
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52 }
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53
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54 #ifdef CLEAN_STACK
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55 zeromem(buf, sizeof(buf));
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56 #endif
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57 return CRYPT_OK;
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58 }
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59
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60 #endif