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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 |
