qxl: check release info object
[qemu.git] / crypto / hash.c
1 /*
2 * QEMU Crypto hash algorithms
3 *
4 * Copyright (c) 2015 Red Hat, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21 #include "qemu/osdep.h"
22 #include "crypto/hash.h"
23 #include "hashpriv.h"
24
25 static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
26 [QCRYPTO_HASH_ALG_MD5] = 16,
27 [QCRYPTO_HASH_ALG_SHA1] = 20,
28 [QCRYPTO_HASH_ALG_SHA224] = 28,
29 [QCRYPTO_HASH_ALG_SHA256] = 32,
30 [QCRYPTO_HASH_ALG_SHA384] = 48,
31 [QCRYPTO_HASH_ALG_SHA512] = 64,
32 [QCRYPTO_HASH_ALG_RIPEMD160] = 20,
33 };
34
35 size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
36 {
37 assert(alg < G_N_ELEMENTS(qcrypto_hash_alg_size));
38 return qcrypto_hash_alg_size[alg];
39 }
40
41 int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
42 const struct iovec *iov,
43 size_t niov,
44 uint8_t **result,
45 size_t *resultlen,
46 Error **errp)
47 {
48 #ifdef CONFIG_AF_ALG
49 int ret;
50 /*
51 * TODO:
52 * Maybe we should treat some afalg errors as fatal
53 */
54 ret = qcrypto_hash_afalg_driver.hash_bytesv(alg, iov, niov,
55 result, resultlen,
56 NULL);
57 if (ret == 0) {
58 return ret;
59 }
60 #endif
61
62 return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
63 result, resultlen,
64 errp);
65 }
66
67
68 int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
69 const char *buf,
70 size_t len,
71 uint8_t **result,
72 size_t *resultlen,
73 Error **errp)
74 {
75 struct iovec iov = { .iov_base = (char *)buf,
76 .iov_len = len };
77 return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
78 }
79
80 static const char hex[] = "0123456789abcdef";
81
82 int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
83 const struct iovec *iov,
84 size_t niov,
85 char **digest,
86 Error **errp)
87 {
88 uint8_t *result = NULL;
89 size_t resultlen = 0;
90 size_t i;
91
92 if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
93 return -1;
94 }
95
96 *digest = g_new0(char, (resultlen * 2) + 1);
97 for (i = 0 ; i < resultlen ; i++) {
98 (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
99 (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
100 }
101 (*digest)[resultlen * 2] = '\0';
102 g_free(result);
103 return 0;
104 }
105
106 int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
107 const char *buf,
108 size_t len,
109 char **digest,
110 Error **errp)
111 {
112 struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
113
114 return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
115 }
116
117 int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
118 const struct iovec *iov,
119 size_t niov,
120 char **base64,
121 Error **errp)
122 {
123 uint8_t *result = NULL;
124 size_t resultlen = 0;
125
126 if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
127 return -1;
128 }
129
130 *base64 = g_base64_encode(result, resultlen);
131 g_free(result);
132 return 0;
133 }
134
135 int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
136 const char *buf,
137 size_t len,
138 char **base64,
139 Error **errp)
140 {
141 struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
142
143 return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
144 }