Mercurial > dropbear
annotate libtomcrypt/src/mac/hmac/hmac_init.c @ 1699:ef57ead04987
merge
author | Matt Johnston <matt@ucc.asn.au> |
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date | Thu, 28 May 2020 22:52:01 +0800 |
parents | 6dba84798cd5 |
children | 1ff2a1034c52 |
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 { |
1056 | 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 |
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96 #endif |
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97 |
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98 /* ref: $Format:%D$ */ |
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99 /* git commit: $Format:%H$ */ |
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100 /* commit time: $Format:%ai$ */ |