annotate libtomcrypt/src/mac/hmac/hmac_file.c @ 447:278805938dcf

Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents 0cbe8f6dbf9e
children eef377591301
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 *
382
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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 hmac_file.c
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15 HMAC support, process a file, Tom St Denis/Dobes Vandermeer
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16 */
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17
382
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18 #ifdef LTC_HMAC
285
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19
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20 /**
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21 HMAC a file
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22 @param hash The index of the hash you wish to use
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23 @param fname The name of the file you wish to HMAC
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24 @param key The secret key
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25 @param keylen The length of the secret key
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26 @param out [out] The HMAC authentication tag
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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 hmac_file(int hash, const char *fname,
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31 const unsigned char *key, unsigned long keylen,
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32 unsigned char *out, unsigned long *outlen)
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33 {
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34 #ifdef LTC_NO_FILE
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35 return CRYPT_NOP;
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36 #else
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37 hmac_state hmac;
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38 FILE *in;
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39 unsigned char buf[512];
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40 size_t x;
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41 int err;
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42
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43 LTC_ARGCHK(fname != NULL);
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44 LTC_ARGCHK(key != 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 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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49 return err;
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50 }
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51
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52 if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
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53 return err;
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54 }
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55
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56 in = fopen(fname, "rb");
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57 if (in == NULL) {
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58 return CRYPT_FILE_NOTFOUND;
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59 }
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60
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61 /* process the file contents */
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62 do {
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63 x = fread(buf, 1, sizeof(buf), in);
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64 if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) {
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65 /* we don't trap this error since we're already returning an error! */
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66 fclose(in);
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67 return err;
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68 }
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69 } while (x == sizeof(buf));
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70
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71 if (fclose(in) != 0) {
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72 return CRYPT_ERROR;
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73 }
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74
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75 /* get final hmac */
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76 if ((err = hmac_done(&hmac, out, outlen)) != CRYPT_OK) {
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77 return err;
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78 }
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79
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80 #ifdef LTC_CLEAN_STACK
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81 /* clear memory */
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82 zeromem(buf, sizeof(buf));
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83 #endif
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84 return CRYPT_OK;
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85 #endif
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86 }
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87
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88 #endif
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89
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90
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_file.c,v $ */
382
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
92 /* $Revision: 1.5 $ */
0cbe8f6dbf9e propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 2af22fb4e878750b88f80f90d439b316d229796f)
Matt Johnston <matt@ucc.asn.au>
parents: 285
diff changeset
93 /* $Date: 2006/11/03 00:39:49 $ */