annotate hmac-sha1.c @ 20:bc48a1d17edf

near done
author Matt Johnston <matt@ucc.asn.au>
date Sun, 16 Jun 2013 13:04:09 +0800
parents 8705acff2494
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* hmac-sha1.c */
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 /*
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 This file is part of the AVR-Crypto-Lib.
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
4 Copyright (C) 2008 Daniel Otte ([email protected])
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
5
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 This program is free software: you can redistribute it and/or modify
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 it under the terms of the GNU General Public License as published by
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 the Free Software Foundation, either version 3 of the License, or
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9 (at your option) any later version.
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11 This program is distributed in the hope that it will be useful,
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14 GNU General Public License for more details.
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16 You should have received a copy of the GNU General Public License
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 */
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19 /**
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 *
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 * implementation of HMAC as described in RFC2104
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
22 * Author: Daniel Otte
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 * email: [email protected]
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24 * License: GPLv3 or later
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25 **/
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27 /*
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
28 * hmac = hash ( k^opad , hash( k^ipad , msg))
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29 */
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
30
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
31 #include <stdint.h>
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32 #include <string.h>
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
33 #include "config.h"
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
34 #include "sha1.h"
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
35 #include "hmac-sha1.h"
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
36
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
37 #define IPAD 0x36
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
38 #define OPAD 0x5C
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
39
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
40
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
41 #ifndef HMAC_SHORTONLY
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
42
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
43 void hmac_sha1_init(hmac_sha1_ctx_t *s, const void* key, uint16_t keylength_b){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
44 uint8_t buffer[SHA1_BLOCK_BYTES];
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
45 uint8_t i;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
46
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
47 memset(buffer, 0, SHA1_BLOCK_BYTES);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
48 if (keylength_b > SHA1_BLOCK_BITS){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
49 sha1((void*)buffer, key, keylength_b);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
50 } else {
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
51 memcpy(buffer, key, (keylength_b+7)/8);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
52 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
53
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
54 for (i=0; i<SHA1_BLOCK_BYTES; ++i){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
55 buffer[i] ^= IPAD;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
56 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
57 sha1_init(&(s->a));
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
58 sha1_nextBlock(&(s->a), buffer);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
59
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
60 for (i=0; i<SHA1_BLOCK_BYTES; ++i){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
61 buffer[i] ^= IPAD^OPAD;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
62 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
63 sha1_init(&(s->b));
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
64 sha1_nextBlock(&(s->b), buffer);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
65
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 #if defined SECURE_WIPE_BUFFER
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 memset(buffer, 0, SHA1_BLOCK_BYTES);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
69 #endif
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 void hmac_sha1_nextBlock(hmac_sha1_ctx_t *s, const void* block){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 sha1_nextBlock(&(s->a), block);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 void hmac_sha1_lastBlock(hmac_sha1_ctx_t *s, const void* block, uint16_t length_b){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 while(length_b>=SHA1_BLOCK_BITS){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77 sha1_nextBlock(&s->a, block);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
78 block = (uint8_t*)block + SHA1_BLOCK_BYTES;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
79 length_b -= SHA1_BLOCK_BITS;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
80 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
81 sha1_lastBlock(&s->a, block, length_b);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
82 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
83
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
84 void hmac_sha1_final(void* dest, hmac_sha1_ctx_t *s){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
85 sha1_ctx2hash(dest, &s->a);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
86 sha1_lastBlock(&s->b, dest, SHA1_HASH_BITS);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
87 sha1_ctx2hash(dest, &(s->b));
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
88 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
89
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
90 #endif
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
91
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
92 /*
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
93 * keylength in bits!
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
94 * message length in bits!
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
95 */
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
96 void hmac_sha1(void* dest, const void* key, uint16_t keylength_b, const void* msg, uint32_t msglength_b){ /* a one-shot*/
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
97 sha1_ctx_t s;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
98 uint8_t i;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
99 uint8_t buffer[SHA1_BLOCK_BYTES];
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
100
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
101 memset(buffer, 0, SHA1_BLOCK_BYTES);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
102
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
103 /* if key is larger than a block we have to hash it*/
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
104 if (keylength_b > SHA1_BLOCK_BITS){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
105 sha1((void*)buffer, key, keylength_b);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
106 } else {
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
107 memcpy(buffer, key, (keylength_b+7)/8);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
108 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
109
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
110 for (i=0; i<SHA1_BLOCK_BYTES; ++i){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
111 buffer[i] ^= IPAD;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
112 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
113 sha1_init(&s);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
114 sha1_nextBlock(&s, buffer);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
115 while (msglength_b >= SHA1_BLOCK_BITS){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
116 sha1_nextBlock(&s, msg);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
117 msg = (uint8_t*)msg + SHA1_BLOCK_BYTES;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
118 msglength_b -= SHA1_BLOCK_BITS;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
119 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
120 sha1_lastBlock(&s, msg, msglength_b);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
121 /* since buffer still contains key xor ipad we can do ... */
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
122 for (i=0; i<SHA1_BLOCK_BYTES; ++i){
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
123 buffer[i] ^= IPAD ^ OPAD;
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
124 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
125 sha1_ctx2hash(dest, &s); /* save inner hash temporary to dest */
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
126 sha1_init(&s);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
127 sha1_nextBlock(&s, buffer);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
128 sha1_lastBlock(&s, dest, SHA1_HASH_BITS);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
129 sha1_ctx2hash(dest, &s);
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
130 }
8705acff2494 lots of stuff
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
131