Mercurial > dropbear

annotate libtomcrypt/src/mac/hmac/hmac_init.c @ 1934:83b6a47759a8

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Add m_snprintf() that won't return negative
author Matt Johnston <matt@ucc.asn.au>
date Fri, 01 Apr 2022 12:10:48 +0800
parents 1ff2a1034c52
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file hmac_init.c
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13 HMAC support, initialize state, Tom St Denis/Dobes Vandermeer
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14 */
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15
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16 #ifdef LTC_HMAC
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17
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18 #define LTC_HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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19
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20 /**
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21 Initialize an HMAC context.
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22 @param hmac The HMAC state
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23 @param hash The index of the hash you want to use
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24 @param key The secret key
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25 @param keylen The length of the secret key (octets)
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26 @return CRYPT_OK if successful
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27 */
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28 int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned long keylen)
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29 {
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30 unsigned char buf[MAXBLOCKSIZE];
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31 unsigned long hashsize;
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32 unsigned long i, z;
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33 int err;
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34
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35 LTC_ARGCHK(hmac != NULL);
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36 LTC_ARGCHK(key != NULL);
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37
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38 /* valid hash? */
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39 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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40 return err;
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41 }
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42 hmac->hash = hash;
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43 hashsize = hash_descriptor[hash].hashsize;
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44
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45 /* valid key length? */
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46 if (keylen == 0) {
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47 return CRYPT_INVALID_KEYSIZE;
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48 }
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49
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50 /* allocate memory for key */
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51 hmac->key = XMALLOC(LTC_HMAC_BLOCKSIZE);
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52 if (hmac->key == NULL) {
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53 return CRYPT_MEM;
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54 }
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55
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56 /* (1) make sure we have a large enough key */
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57 if(keylen > LTC_HMAC_BLOCKSIZE) {
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58 z = LTC_HMAC_BLOCKSIZE;
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59 if ((err = hash_memory(hash, key, keylen, hmac->key, &z)) != CRYPT_OK) {
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60 goto LBL_ERR;
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61 }
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62 keylen = hashsize;
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63 } else {
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64 XMEMCPY(hmac->key, key, (size_t)keylen);
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65 }
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66
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67 if(keylen < LTC_HMAC_BLOCKSIZE) {
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68 zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen));
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69 }
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70
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71 /* Create the initialization vector for step (3) */
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72 for(i=0; i < LTC_HMAC_BLOCKSIZE; i++) {
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73 buf[i] = hmac->key[i] ^ 0x36;
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74 }
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75
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76 /* Pre-pend that to the hash data */
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77 if ((err = hash_descriptor[hash].init(&hmac->md)) != CRYPT_OK) {
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78 goto LBL_ERR;
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79 }
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80
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81 if ((err = hash_descriptor[hash].process(&hmac->md, buf, LTC_HMAC_BLOCKSIZE)) != CRYPT_OK) {
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82 goto LBL_ERR;
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83 }
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84 goto done;
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85 LBL_ERR:
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86 /* free the key since we failed */
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87 XFREE(hmac->key);
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88 done:
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89 #ifdef LTC_CLEAN_STACK
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90 zeromem(buf, LTC_HMAC_BLOCKSIZE);
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91 #endif
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92
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93 return err;
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94 }
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95
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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96 #endif
1b9e69c058d2 propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
Matt Johnston <matt@ucc.asn.au>
parents:
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97
1471
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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98 /* ref: $Format:%D$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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99 /* git commit: $Format:%H$ */
6dba84798cd5 Update to libtomcrypt 1.18.1, merged with Dropbear changes
Matt Johnston <matt@ucc.asn.au>
parents: 1435
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100 /* commit time: $Format:%ai$ */