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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_memory(int cipher, |
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17 const unsigned char *key, unsigned long keylen, |
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18 const unsigned char *msg, unsigned long msglen, |
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19 unsigned char *out, unsigned long *outlen) |
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20 { |
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21 int err; |
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143
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22 omac_state *omac; |
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3
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23 |
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143
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24 _ARGCHK(key != NULL); |
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25 _ARGCHK(msg != NULL); |
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26 _ARGCHK(out != NULL); |
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3
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27 _ARGCHK(outlen != NULL); |
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28 |
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143
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29 /* allocate ram for omac state */ |
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30 omac = XMALLOC(sizeof(omac_state)); |
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31 if (omac == NULL) { |
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32 return CRYPT_MEM; |
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3
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33 } |
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34 |
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143
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35 /* omac process the message */ |
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36 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) { |
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37 goto __ERR; |
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38 } |
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39 if ((err = omac_process(omac, msg, msglen)) != CRYPT_OK) { |
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40 goto __ERR; |
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41 } |
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42 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) { |
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43 goto __ERR; |
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44 } |
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45 |
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46 err = CRYPT_OK; |
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47 __ERR: |
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48 #ifdef CLEAN_STACK |
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49 zeromem(omac, sizeof(omac_state)); |
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50 #endif |
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51 |
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52 XFREE(omac); |
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53 return err; |
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3
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54 } |
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55 |
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56 #endif |
