Mercurial > dropbear

annotate src/mac/hmac/hmac_init.c @ 230:809b681a9af5 libtomcrypt

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- check for generic AES/TWOFISH settings from Dropbear, not AES128 etc
author Matt Johnston <matt@ucc.asn.au>
date Tue, 30 Aug 2005 17:40:30 +0000
parents 39d5d58461d6
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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191
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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_init.c
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15 HMAC support, initialize state, 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 Initialize an HMAC context.
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24 @param hmac The HMAC state
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25 @param hash The index of the hash you want to use
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26 @param key The secret key
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27 @param keylen The length of the secret key (octets)
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28 @return CRYPT_OK if successful
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29 */
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30 int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned long keylen)
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31 {
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32 unsigned char *buf;
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33 unsigned long hashsize;
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34 unsigned long i, z;
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35 int err;
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36
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37 LTC_ARGCHK(hmac != NULL);
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38 LTC_ARGCHK(key != NULL);
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39
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40 /* valid hash? */
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41 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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42 return err;
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43 }
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44 hmac->hash = hash;
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45 hashsize = hash_descriptor[hash].hashsize;
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46
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47 /* valid key length? */
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48 if (keylen == 0) {
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49 return CRYPT_INVALID_KEYSIZE;
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50 }
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51
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52 /* allocate ram for buf */
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53 buf = XMALLOC(HMAC_BLOCKSIZE);
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54 if (buf == NULL) {
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55 return CRYPT_MEM;
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56 }
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57
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58 /* allocate memory for key */
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59 hmac->key = XMALLOC(HMAC_BLOCKSIZE);
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60 if (hmac->key == NULL) {
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61 XFREE(buf);
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62 return CRYPT_MEM;
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63 }
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64
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65 /* (1) make sure we have a large enough key */
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66 if(keylen > HMAC_BLOCKSIZE) {
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67 z = HMAC_BLOCKSIZE;
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68 if ((err = hash_memory(hash, key, keylen, hmac->key, &z)) != CRYPT_OK) {
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69 goto LBL_ERR;
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70 }
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71 if(hashsize < HMAC_BLOCKSIZE) {
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72 zeromem((hmac->key) + hashsize, (size_t)(HMAC_BLOCKSIZE - hashsize));
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73 }
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74 keylen = hashsize;
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75 } else {
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76 XMEMCPY(hmac->key, key, (size_t)keylen);
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77 if(keylen < HMAC_BLOCKSIZE) {
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78 zeromem((hmac->key) + keylen, (size_t)(HMAC_BLOCKSIZE - keylen));
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79 }
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80 }
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81
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82 /* Create the initial vector for step (3) */
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83 for(i=0; i < HMAC_BLOCKSIZE; i++) {
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84 buf[i] = hmac->key[i] ^ 0x36;
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85 }
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86
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87 /* Pre-pend that to the hash data */
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88 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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89 goto LBL_ERR;
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90 }
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91
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92 if ((err = hash_descriptor[hash].process(&hmac->md, buf, HMAC_BLOCKSIZE)) != CRYPT_OK) {
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93 goto LBL_ERR;
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94 }
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95 goto done;
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96 LBL_ERR:
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97 /* free the key since we failed */
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98 XFREE(hmac->key);
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99 done:
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100 #ifdef LTC_CLEAN_STACK
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101 zeromem(buf, HMAC_BLOCKSIZE);
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102 #endif
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103
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104 XFREE(buf);
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105 return err;
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106 }
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107
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108 #endif
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109
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110 /* $Source: /cvs/libtom/libtomcrypt/src/mac/hmac/hmac_init.c,v $ */
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111 /* $Revision: 1.3 $ */
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112 /* $Date: 2005/05/05 14:35:58 $ */