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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_process.c |
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15 f9 Support, process blocks with f9 |
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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 /** Process data through f9-MAC |
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21 @param f9 The f9-MAC state |
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22 @param in Input data to process |
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23 @param inlen Length of input in octets |
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24 Return CRYPT_OK on success |
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25 */ |
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26 int f9_process(f9_state *f9, const unsigned char *in, unsigned long inlen) |
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27 { |
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28 int err, x; |
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29 |
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30 LTC_ARGCHK(f9 != NULL); |
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31 LTC_ARGCHK(in != NULL); |
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32 |
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33 /* check structure */ |
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34 if ((err = cipher_is_valid(f9->cipher)) != CRYPT_OK) { |
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35 return err; |
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36 } |
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37 |
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38 if ((f9->blocksize > cipher_descriptor[f9->cipher].block_length) || (f9->blocksize < 0) || |
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39 (f9->buflen > f9->blocksize) || (f9->buflen < 0)) { |
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40 return CRYPT_INVALID_ARG; |
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41 } |
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42 |
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43 #ifdef LTC_FAST |
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44 if (f9->buflen == 0) { |
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45 while (inlen >= (unsigned long)f9->blocksize) { |
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46 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) { |
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47 *((LTC_FAST_TYPE*)&(f9->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x])); |
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48 } |
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49 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key); |
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50 for (x = 0; x < f9->blocksize; x += sizeof(LTC_FAST_TYPE)) { |
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51 *((LTC_FAST_TYPE*)&(f9->ACC[x])) ^= *((LTC_FAST_TYPE*)&(f9->IV[x])); |
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52 } |
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53 in += f9->blocksize; |
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54 inlen -= f9->blocksize; |
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55 } |
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56 } |
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57 #endif |
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58 |
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59 while (inlen) { |
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60 if (f9->buflen == f9->blocksize) { |
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61 cipher_descriptor[f9->cipher].ecb_encrypt(f9->IV, f9->IV, &f9->key); |
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62 for (x = 0; x < f9->blocksize; x++) { |
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63 f9->ACC[x] ^= f9->IV[x]; |
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64 } |
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65 f9->buflen = 0; |
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66 } |
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67 f9->IV[f9->buflen++] ^= *in++; |
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68 --inlen; |
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69 } |
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70 return CRYPT_OK; |
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71 } |
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72 |
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73 #endif |
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74 |
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75 /* $Source: /cvs/libtom/libtomcrypt/src/mac/f9/f9_process.c,v $ */ |
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76 /* $Revision: 1.3 $ */ |
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77 /* $Date: 2006/12/16 17:41:21 $ */ |
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78 |
