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annotate omac_file.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 /* OMAC1 Support by Tom St Denis (for 64 and 128 bit block ciphers only) */
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12 #include "mycrypt.h"
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13
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14 #ifdef OMAC
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15
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16 int omac_file(int cipher,
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17 const unsigned char *key, unsigned long keylen,
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18 const char *filename,
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19 unsigned char *out, unsigned long *outlen)
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20 {
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21 #ifdef NO_FILE
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22 return CRYPT_NOP;
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23 #else
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24 int err, x;
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25 omac_state omac;
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26 FILE *in;
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27 unsigned char buf[512];
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28
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29 _ARGCHK(key != NULL);
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30 _ARGCHK(filename != NULL);
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31 _ARGCHK(out != NULL);
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32 _ARGCHK(outlen != NULL);
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33
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34 in = fopen(filename, "rb");
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35 if (in == NULL) {
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36 return CRYPT_FILE_NOTFOUND;
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37 }
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38
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39 if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
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40 fclose(in);
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41 return err;
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42 }
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43
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44 do {
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45 x = fread(buf, 1, sizeof(buf), in);
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46 if ((err = omac_process(&omac, buf, x)) != CRYPT_OK) {
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47 fclose(in);
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48 return err;
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49 }
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50 } while (x == sizeof(buf));
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51 fclose(in);
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52
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53 if ((err = omac_done(&omac, out, outlen)) != CRYPT_OK) {
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54 return err;
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55 }
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56
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57 #ifdef CLEAN_STACK
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58 zeromem(buf, sizeof(buf));
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59 #endif
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60
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61 return CRYPT_OK;
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62 #endif
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63 }
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64
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65 #endif