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annotate hmac_init.c @ 211:f01f0400314d libtomcrypt

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disapproval of revision 6a39eb8b36778460fca83b8149df2a8b6d3327fd
author Matt Johnston <matt@ucc.asn.au>
date Wed, 06 Jul 2005 13:23:45 +0000
parents d7da3b1e1540
children 5d99163f7e32
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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 /* Submited by Dobes Vandermeer ([email protected]) */
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12
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13 #include "mycrypt.h"
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14
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15 /*
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16 (1) append zeros to the end of K to create a B byte string
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17 (e.g., if K is of length 20 bytes and B=64, then K will be
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18 appended with 44 zero bytes 0x00)
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19 (2) XOR (bitwise exclusive-OR) the B byte string computed in step
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20 (1) with ipad (ipad = the byte 0x36 repeated B times)
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21 (3) append the stream of data 'text' to the B byte string resulting
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22 from step (2)
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23 (4) apply H to the stream generated in step (3)
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24 (5) XOR (bitwise exclusive-OR) the B byte string computed in
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25 step (1) with opad (opad = the byte 0x5C repeated B times.)
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26 (6) append the H result from step (4) to the B byte string
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27 resulting from step (5)
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28 (7) apply H to the stream generated in step (6) and output
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29 the result
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30 */
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31
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32 #ifdef HMAC
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33
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34 #define HMAC_BLOCKSIZE hash_descriptor[hash].blocksize
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35
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36 int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned long keylen)
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37 {
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38 unsigned char buf[MAXBLOCKSIZE];
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39 unsigned long hashsize;
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40 unsigned long i, z;
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41 int err;
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42
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43 _ARGCHK(hmac != NULL);
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44 _ARGCHK(key != NULL);
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45
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46 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
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47 return err;
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48 }
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49
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50 /* valid key length? */
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51 if (keylen == 0) {
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52 return CRYPT_INVALID_KEYSIZE;
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53 }
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54
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55 hmac->hash = hash;
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56
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57 // (1) make sure we have a large enough key
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58 hashsize = hash_descriptor[hash].hashsize;
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59 if(keylen > HMAC_BLOCKSIZE) {
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60 z = (unsigned long)sizeof(hmac->key);
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61 if ((err = hash_memory(hash, key, keylen, hmac->key, &z)) != CRYPT_OK) {
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62 return err;
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63 }
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64 if(hashsize < HMAC_BLOCKSIZE) {
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65 zeromem((hmac->key) + hashsize, (size_t)(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 memcpy(hmac->key, key, (size_t)keylen);
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70 if(keylen < HMAC_BLOCKSIZE) {
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71 zeromem((hmac->key) + keylen, (size_t)(HMAC_BLOCKSIZE - keylen));
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72 }
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73 }
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74
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75 // Create the initial vector for step (3)
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76 for(i=0; i < 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 hash_descriptor[hash].init(&hmac->md);
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82 hash_descriptor[hash].process(&hmac->md, buf, HMAC_BLOCKSIZE);
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83
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84 return CRYPT_OK;
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85 }
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86
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87 #endif