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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 xcbc_process.c |
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15 XCBC Support, process blocks with XCBC |
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16 */ |
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17 |
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18 #ifdef LTC_XCBC |
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19 |
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20 /** Process data through XCBC-MAC |
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21 @param xcbc The XCBC-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 xcbc_process(xcbc_state *xcbc, const unsigned char *in, unsigned long inlen) |
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27 { |
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28 int err; |
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29 #ifdef LTC_FAST |
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30 int x; |
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31 #endif |
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32 |
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33 LTC_ARGCHK(xcbc != NULL); |
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34 LTC_ARGCHK(in != NULL); |
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35 |
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36 /* check structure */ |
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37 if ((err = cipher_is_valid(xcbc->cipher)) != CRYPT_OK) { |
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38 return err; |
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39 } |
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40 |
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41 if ((xcbc->blocksize > cipher_descriptor[xcbc->cipher].block_length) || (xcbc->blocksize < 0) || |
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42 (xcbc->buflen > xcbc->blocksize) || (xcbc->buflen < 0)) { |
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43 return CRYPT_INVALID_ARG; |
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44 } |
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45 |
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46 #ifdef LTC_FAST |
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47 if (xcbc->buflen == 0) { |
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48 while (inlen > (unsigned long)xcbc->blocksize) { |
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49 for (x = 0; x < xcbc->blocksize; x += sizeof(LTC_FAST_TYPE)) { |
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50 *((LTC_FAST_TYPE*)&(xcbc->IV[x])) ^= *((LTC_FAST_TYPE*)&(in[x])); |
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51 } |
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52 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key); |
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53 in += xcbc->blocksize; |
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54 inlen -= xcbc->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 (xcbc->buflen == xcbc->blocksize) { |
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61 cipher_descriptor[xcbc->cipher].ecb_encrypt(xcbc->IV, xcbc->IV, &xcbc->key); |
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62 xcbc->buflen = 0; |
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63 } |
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64 xcbc->IV[xcbc->buflen++] ^= *in++; |
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65 --inlen; |
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66 } |
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67 return CRYPT_OK; |
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68 } |
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69 |
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70 #endif |
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71 |
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72 /* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_process.c,v $ */ |
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73 /* $Revision: 1.9 $ */ |
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74 /* $Date: 2006/11/09 22:43:52 $ */ |
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75 |
