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annotate src/mac/hmac/hmac_done.c @ 209:39d5d58461d6 libtomcrypt-orig LTC_1.05

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Import of libtomcrypt 1.05
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 03:53:40 +0000
parents 1c15b283127b
children
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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.org
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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_done.c
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15 HMAC support, terminate stream, Tom St Denis/Dobes Vandermeer
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16 */
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17
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18 #ifdef HMAC
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19
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20 #define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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21
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22 /**
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23 Terminate an HMAC session
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24 @param hmac The HMAC state
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25 @param out [out] The destination of the HMAC authentication tag
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26 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag
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27 @return CRYPT_OK if successful
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28 */
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29 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen)
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30 {
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31 unsigned char *buf, *isha;
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32 unsigned long hashsize, i;
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33 int hash, err;
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34
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35 LTC_ARGCHK(hmac != NULL);
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36 LTC_ARGCHK(out != NULL);
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37
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38 /* test hash */
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39 hash = hmac->hash;
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40 if((err = hash_is_valid(hash)) != CRYPT_OK) {
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41 return err;
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42 }
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43
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44 /* get the hash message digest size */
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45 hashsize = hash_descriptor[hash].hashsize;
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46
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47 /* allocate buffers */
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48 buf = XMALLOC(HMAC_BLOCKSIZE);
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49 isha = XMALLOC(hashsize);
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50 if (buf == NULL || isha == NULL) {
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51 if (buf != NULL) {
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52 XFREE(buf);
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53 }
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54 if (isha != NULL) {
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55 XFREE(isha);
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56 }
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57 return CRYPT_MEM;
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58 }
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59
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60 /* Get the hash of the first HMAC vector plus the data */
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61 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64
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65 /* Create the second HMAC vector vector for step (3) */
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66 for(i=0; i < HMAC_BLOCKSIZE; i++) {
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67 buf[i] = hmac->key[i] ^ 0x5C;
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68 }
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69
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70 /* Now calculate the "outer" hash for step (5), (6), and (7) */
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71 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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72 goto LBL_ERR;
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73 }
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74 if ((err = hash_descriptor[hash].process(&hmac->md, buf, HMAC_BLOCKSIZE)) != CRYPT_OK) {
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75 goto LBL_ERR;
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76 }
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77 if ((err = hash_descriptor[hash].process(&hmac->md, isha, hashsize)) != CRYPT_OK) {
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78 goto LBL_ERR;
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79 }
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80 if ((err = hash_descriptor[hash].done(&hmac->md, buf)) != CRYPT_OK) {
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81 goto LBL_ERR;
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82 }
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83
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84 /* copy to output */
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85 for (i = 0; i < hashsize && i < *outlen; i++) {
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86 out[i] = buf[i];
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87 }
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88 *outlen = i;
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89
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90 err = CRYPT_OK;
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91 LBL_ERR:
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92 XFREE(hmac->key);
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93 #ifdef LTC_CLEAN_STACK
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94 zeromem(isha, hashsize);
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95 zeromem(buf, hashsize);
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96 zeromem(hmac, sizeof(*hmac));
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97 #endif
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98
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99 XFREE(isha);
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100 XFREE(buf);
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101
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102 return err;
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103 }
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104
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105 #endif
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106
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107 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_done.c,v $ */
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108 /* $Revision: 1.3 $ */
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109 /* $Date: 2005/05/05 14:35:58 $ */