This repository has been archived by the owner on Nov 16, 2021. It is now read-only.
-
-
Notifications
You must be signed in to change notification settings - Fork 201
/
hmac.c
176 lines (158 loc) · 6.23 KB
/
hmac.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
/**
* Copyright (c) 2013-2014 Tomas Dzetkulic
* Copyright (c) 2013-2014 Pavol Rusnak
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include "hmac.h"
#include "memzero.h"
#include "options.h"
void hmac_sha256_Init(HMAC_SHA256_CTX *hctx, const uint8_t *key,
const uint32_t keylen) {
static CONFIDENTIAL uint8_t i_key_pad[SHA256_BLOCK_LENGTH];
memzero(i_key_pad, SHA256_BLOCK_LENGTH);
if (keylen > SHA256_BLOCK_LENGTH) {
sha256_Raw(key, keylen, i_key_pad);
} else {
memcpy(i_key_pad, key, keylen);
}
for (int i = 0; i < SHA256_BLOCK_LENGTH; i++) {
hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c;
i_key_pad[i] ^= 0x36;
}
sha256_Init(&(hctx->ctx));
sha256_Update(&(hctx->ctx), i_key_pad, SHA256_BLOCK_LENGTH);
memzero(i_key_pad, sizeof(i_key_pad));
}
void hmac_sha256_Update(HMAC_SHA256_CTX *hctx, const uint8_t *msg,
const uint32_t msglen) {
sha256_Update(&(hctx->ctx), msg, msglen);
}
void hmac_sha256_Final(HMAC_SHA256_CTX *hctx, uint8_t *hmac) {
sha256_Final(&(hctx->ctx), hmac);
sha256_Init(&(hctx->ctx));
sha256_Update(&(hctx->ctx), hctx->o_key_pad, SHA256_BLOCK_LENGTH);
sha256_Update(&(hctx->ctx), hmac, SHA256_DIGEST_LENGTH);
sha256_Final(&(hctx->ctx), hmac);
memzero(hctx, sizeof(HMAC_SHA256_CTX));
}
void hmac_sha256(const uint8_t *key, const uint32_t keylen, const uint8_t *msg,
const uint32_t msglen, uint8_t *hmac) {
static CONFIDENTIAL HMAC_SHA256_CTX hctx;
hmac_sha256_Init(&hctx, key, keylen);
hmac_sha256_Update(&hctx, msg, msglen);
hmac_sha256_Final(&hctx, hmac);
}
void hmac_sha256_prepare(const uint8_t *key, const uint32_t keylen,
uint32_t *opad_digest, uint32_t *ipad_digest) {
static CONFIDENTIAL uint32_t key_pad[SHA256_BLOCK_LENGTH / sizeof(uint32_t)];
memzero(key_pad, sizeof(key_pad));
if (keylen > SHA256_BLOCK_LENGTH) {
static CONFIDENTIAL SHA256_CTX context;
sha256_Init(&context);
sha256_Update(&context, key, keylen);
sha256_Final(&context, (uint8_t *)key_pad);
} else {
memcpy(key_pad, key, keylen);
}
/* compute o_key_pad and its digest */
for (int i = 0; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) {
uint32_t data;
#if BYTE_ORDER == LITTLE_ENDIAN
REVERSE32(key_pad[i], data);
#else
data = key_pad[i];
#endif
key_pad[i] = data ^ 0x5c5c5c5c;
}
sha256_Transform(sha256_initial_hash_value, key_pad, opad_digest);
/* convert o_key_pad to i_key_pad and compute its digest */
for (int i = 0; i < SHA256_BLOCK_LENGTH / (int)sizeof(uint32_t); i++) {
key_pad[i] = key_pad[i] ^ 0x5c5c5c5c ^ 0x36363636;
}
sha256_Transform(sha256_initial_hash_value, key_pad, ipad_digest);
memzero(key_pad, sizeof(key_pad));
}
void hmac_sha512_Init(HMAC_SHA512_CTX *hctx, const uint8_t *key,
const uint32_t keylen) {
static CONFIDENTIAL uint8_t i_key_pad[SHA512_BLOCK_LENGTH];
memzero(i_key_pad, SHA512_BLOCK_LENGTH);
if (keylen > SHA512_BLOCK_LENGTH) {
sha512_Raw(key, keylen, i_key_pad);
} else {
memcpy(i_key_pad, key, keylen);
}
for (int i = 0; i < SHA512_BLOCK_LENGTH; i++) {
hctx->o_key_pad[i] = i_key_pad[i] ^ 0x5c;
i_key_pad[i] ^= 0x36;
}
sha512_Init(&(hctx->ctx));
sha512_Update(&(hctx->ctx), i_key_pad, SHA512_BLOCK_LENGTH);
memzero(i_key_pad, sizeof(i_key_pad));
}
void hmac_sha512_Update(HMAC_SHA512_CTX *hctx, const uint8_t *msg,
const uint32_t msglen) {
sha512_Update(&(hctx->ctx), msg, msglen);
}
void hmac_sha512_Final(HMAC_SHA512_CTX *hctx, uint8_t *hmac) {
sha512_Final(&(hctx->ctx), hmac);
sha512_Init(&(hctx->ctx));
sha512_Update(&(hctx->ctx), hctx->o_key_pad, SHA512_BLOCK_LENGTH);
sha512_Update(&(hctx->ctx), hmac, SHA512_DIGEST_LENGTH);
sha512_Final(&(hctx->ctx), hmac);
memzero(hctx, sizeof(HMAC_SHA512_CTX));
}
void hmac_sha512(const uint8_t *key, const uint32_t keylen, const uint8_t *msg,
const uint32_t msglen, uint8_t *hmac) {
HMAC_SHA512_CTX hctx;
hmac_sha512_Init(&hctx, key, keylen);
hmac_sha512_Update(&hctx, msg, msglen);
hmac_sha512_Final(&hctx, hmac);
}
void hmac_sha512_prepare(const uint8_t *key, const uint32_t keylen,
uint64_t *opad_digest, uint64_t *ipad_digest) {
static CONFIDENTIAL uint64_t key_pad[SHA512_BLOCK_LENGTH / sizeof(uint64_t)];
memzero(key_pad, sizeof(key_pad));
if (keylen > SHA512_BLOCK_LENGTH) {
static CONFIDENTIAL SHA512_CTX context;
sha512_Init(&context);
sha512_Update(&context, key, keylen);
sha512_Final(&context, (uint8_t *)key_pad);
} else {
memcpy(key_pad, key, keylen);
}
/* compute o_key_pad and its digest */
for (int i = 0; i < SHA512_BLOCK_LENGTH / (int)sizeof(uint64_t); i++) {
uint64_t data;
#if BYTE_ORDER == LITTLE_ENDIAN
REVERSE64(key_pad[i], data);
#else
data = key_pad[i];
#endif
key_pad[i] = data ^ 0x5c5c5c5c5c5c5c5c;
}
sha512_Transform(sha512_initial_hash_value, key_pad, opad_digest);
/* convert o_key_pad to i_key_pad and compute its digest */
for (int i = 0; i < SHA512_BLOCK_LENGTH / (int)sizeof(uint64_t); i++) {
key_pad[i] = key_pad[i] ^ 0x5c5c5c5c5c5c5c5c ^ 0x3636363636363636;
}
sha512_Transform(sha512_initial_hash_value, key_pad, ipad_digest);
memzero(key_pad, sizeof(key_pad));
}