Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_init.c @ 1468:b528e3753af4

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define CLOCK_MONOTONIC if needed
author Matt Johnston <matt@ucc.asn.au>
date Thu, 08 Feb 2018 22:07:59 +0800
parents f849a5ca2efc
children 6dba84798cd5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
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://libtom.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 LTC_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 LTC_HMAC
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19
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20 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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21
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22 /**
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23 Initialize an LTC_HMAC context.
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24 @param hmac The LTC_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[MAXBLOCKSIZE];
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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 memory for key */
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53 hmac->key = XMALLOC(LTC_HMAC_BLOCKSIZE);
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54 if (hmac->key == NULL) {
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55 return CRYPT_MEM;
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56 }
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57
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58 /* (1) make sure we have a large enough key */
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59 if(keylen > LTC_HMAC_BLOCKSIZE) {
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60 z = LTC_HMAC_BLOCKSIZE;
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61 if ((err = hash_memory(hash, key, keylen, hmac->key, &z)) != CRYPT_OK) {
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62 goto LBL_ERR;
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63 }
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64 if(hashsize < LTC_HMAC_BLOCKSIZE) {
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65 zeromem((hmac->key) + hashsize, (size_t)(LTC_HMAC_BLOCKSIZE - hashsize));
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66 }
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67 keylen = hashsize;
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68 } else {
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69 XMEMCPY(hmac->key, key, (size_t)keylen);
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70 if(keylen < LTC_HMAC_BLOCKSIZE) {
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71 zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen));
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72 }
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73 }
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74
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
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75 /* Create the initial vector for step (3) */
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76 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
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77 buf[i] = hmac->key[i] ^ 0x36;
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78 }
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79
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80 /* Pre-pend that to the hash data */
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81 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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82 goto LBL_ERR;
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83 }
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84
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85 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) {
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86 goto LBL_ERR;
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87 }
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88 goto done;
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89 LBL_ERR:
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90 /* free the key since we failed */
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91 XFREE(hmac->key);
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92 done:
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93 #ifdef LTC_CLEAN_STACK
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94 zeromem(buf, LTC_HMAC_BLOCKSIZE);
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95 #endif
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96
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97 return err;
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98 }
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99
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100 #endif
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101
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102 /* $Source$ */
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103 /* $Revision$ */
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104 /* $Date$ */