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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.com |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file f9_init.c |
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15 F9 Support, start an F9 state |
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16 */ |
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17 |
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18 #ifdef LTC_F9_MODE |
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19 |
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20 /** Initialize F9-MAC state |
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21 @param f9 [out] f9 state to initialize |
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22 @param cipher Index of cipher to use |
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23 @param key [in] Secret key |
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24 @param keylen Length of secret key in octets |
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25 Return CRYPT_OK on success |
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26 */ |
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27 int f9_init(f9_state *f9, int cipher, const unsigned char *key, unsigned long keylen) |
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28 { |
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29 int x, err; |
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30 |
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31 LTC_ARGCHK(f9 != NULL); |
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32 LTC_ARGCHK(key != NULL); |
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33 |
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34 /* schedule the key */ |
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35 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { |
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36 return err; |
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37 } |
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38 |
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39 #ifdef LTC_FAST |
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40 if (cipher_descriptor[cipher].block_length % sizeof(LTC_FAST_TYPE)) { |
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41 return CRYPT_INVALID_ARG; |
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42 } |
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43 #endif |
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44 |
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45 if ((err = cipher_descriptor[cipher].setup(key, keylen, 0, &f9->key)) != CRYPT_OK) { |
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46 goto done; |
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47 } |
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48 |
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49 /* make the second key */ |
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50 for (x = 0; (unsigned)x < keylen; x++) { |
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51 f9->akey[x] = key[x] ^ 0xAA; |
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52 } |
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53 |
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54 /* setup struct */ |
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55 zeromem(f9->IV, cipher_descriptor[cipher].block_length); |
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56 zeromem(f9->ACC, cipher_descriptor[cipher].block_length); |
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57 f9->blocksize = cipher_descriptor[cipher].block_length; |
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58 f9->cipher = cipher; |
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59 f9->buflen = 0; |
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60 f9->keylen = keylen; |
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61 done: |
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62 return err; |
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63 } |
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64 |
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65 #endif |
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66 |
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67 /* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_init.c,v $ */ |
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68 /* $Revision: 1.4 $ */ |
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69 /* $Date: 2006/11/08 22:54:18 $ */ |
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70 |
