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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* QEMU Crypto hash algorithms
*
* Copyright (c) 2015 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include "crypto/hash.h"
#ifdef CONFIG_GNUTLS_HASH
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#endif
static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = 16,
[QCRYPTO_HASH_ALG_SHA1] = 20,
[QCRYPTO_HASH_ALG_SHA256] = 32,
};
size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
{
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_size)) {
return 0;
}
return qcrypto_hash_alg_size[alg];
}
#ifdef CONFIG_GNUTLS_HASH
static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5,
[QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1,
[QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
};
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
{
if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map)) {
return true;
}
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,
uint8_t **result,
size_t *resultlen,
Error **errp)
{
int i, ret;
gnutls_hash_hd_t dig;
if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map)) {
error_setg(errp,
"Unknown hash algorithm %d",
alg);
return -1;
}
ret = gnutls_hash_init(&dig, qcrypto_hash_alg_map[alg]);
if (ret < 0) {
error_setg(errp,
"Unable to initialize hash algorithm: %s",
gnutls_strerror(ret));
return -1;
}
for (i = 0; i < niov; i++) {
ret = gnutls_hash(dig, iov[i].iov_base, iov[i].iov_len);
if (ret < 0) {
error_setg(errp,
"Unable process hash data: %s",
gnutls_strerror(ret));
goto error;
}
}
ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]);
if (ret <= 0) {
error_setg(errp,
"Unable to get hash length: %s",
gnutls_strerror(ret));
goto error;
}
if (*resultlen == 0) {
*resultlen = ret;
*result = g_new0(uint8_t, *resultlen);
} else if (*resultlen != ret) {
error_setg(errp,
"Result buffer size %zu is smaller than hash %d",
*resultlen, ret);
goto error;
}
gnutls_hash_deinit(dig, *result);
return 0;
error:
gnutls_hash_deinit(dig, NULL);
return -1;
}
#else /* ! CONFIG_GNUTLS_HASH */
gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg G_GNUC_UNUSED)
{
return false;
}
int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
const struct iovec *iov G_GNUC_UNUSED,
size_t niov G_GNUC_UNUSED,
uint8_t **result G_GNUC_UNUSED,
size_t *resultlen G_GNUC_UNUSED,
Error **errp)
{
error_setg(errp,
"Hash algorithm %d not supported without GNUTLS",
alg);
return -1;
}
#endif /* ! CONFIG_GNUTLS_HASH */
int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
const char *buf,
size_t len,
uint8_t **result,
size_t *resultlen,
Error **errp)
{
struct iovec iov = { .iov_base = (char *)buf,
.iov_len = len };
return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
}
static const char hex[] = "0123456789abcdef";
int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,
char **digest,
Error **errp)
{
uint8_t *result = NULL;
size_t resultlen = 0;
size_t i;
if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
return -1;
}
*digest = g_new0(char, (resultlen * 2) + 1);
for (i = 0 ; i < resultlen ; i++) {
(*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
(*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
}
(*digest)[resultlen * 2] = '\0';
g_free(result);
return 0;
}
int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
const char *buf,
size_t len,
char **digest,
Error **errp)
{
struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
}
int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
const struct iovec *iov,
size_t niov,
char **base64,
Error **errp)
{
uint8_t *result = NULL;
size_t resultlen = 0;
if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
return -1;
}
*base64 = g_base64_encode(result, resultlen);
g_free(result);
return 0;
}
int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
const char *buf,
size_t len,
char **base64,
Error **errp)
{
struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
}
|
