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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_file.c |
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15 XCBC support, process a file, Tom St Denis |
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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 /** |
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21 XCBC a file |
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22 @param cipher The index of the cipher desired |
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23 @param key The secret key |
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24 @param keylen The length of the secret key (octets) |
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25 @param filename The name of the file you wish to XCBC |
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26 @param out [out] Where the authentication tag is to be stored |
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27 @param outlen [in/out] The max size and resulting size of the authentication tag |
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28 @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled |
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29 */ |
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30 int xcbc_file(int cipher, |
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31 const unsigned char *key, unsigned long keylen, |
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32 const char *filename, |
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33 unsigned char *out, unsigned long *outlen) |
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34 { |
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35 #ifdef LTC_NO_FILE |
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36 return CRYPT_NOP; |
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37 #else |
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38 int err, x; |
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39 xcbc_state xcbc; |
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40 FILE *in; |
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41 unsigned char buf[512]; |
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42 |
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43 LTC_ARGCHK(key != NULL); |
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44 LTC_ARGCHK(filename != NULL); |
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45 LTC_ARGCHK(out != NULL); |
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46 LTC_ARGCHK(outlen != NULL); |
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47 |
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48 in = fopen(filename, "rb"); |
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49 if (in == NULL) { |
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50 return CRYPT_FILE_NOTFOUND; |
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51 } |
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52 |
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53 if ((err = xcbc_init(&xcbc, cipher, key, keylen)) != CRYPT_OK) { |
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54 fclose(in); |
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55 return err; |
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56 } |
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57 |
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58 do { |
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59 x = fread(buf, 1, sizeof(buf), in); |
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60 if ((err = xcbc_process(&xcbc, buf, x)) != CRYPT_OK) { |
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61 fclose(in); |
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62 return err; |
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63 } |
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64 } while (x == sizeof(buf)); |
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65 fclose(in); |
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66 |
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67 if ((err = xcbc_done(&xcbc, out, outlen)) != CRYPT_OK) { |
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68 return err; |
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69 } |
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70 |
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71 #ifdef LTC_CLEAN_STACK |
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72 zeromem(buf, sizeof(buf)); |
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73 #endif |
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74 |
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75 return CRYPT_OK; |
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76 #endif |
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77 } |
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78 |
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79 #endif |
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80 |
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81 /* $Source: /cvs/libtom/libtomcrypt/src/mac/xcbc/xcbc_file.c,v $ */ |
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82 /* $Revision: 1.1 $ */ |
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83 /* $Date: 2006/11/03 01:56:41 $ */ |
