Merge remote-tracking branch 'remotes/kraxel/tags/pull-vga-20170103-1' into staging
[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 "qapi/error.h"
23 #include "crypto/hash.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
42 int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
43 const char *buf,
44 size_t len,
45 uint8_t **result,
46 size_t *resultlen,
47 Error **errp)
48 {
49 struct iovec iov = { .iov_base = (char *)buf,
50 .iov_len = len };
51 return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
52 }
53
54 static const char hex[] = "0123456789abcdef";
55
56 int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
57 const struct iovec *iov,
58 size_t niov,
59 char **digest,
60 Error **errp)
61 {
62 uint8_t *result = NULL;
63 size_t resultlen = 0;
64 size_t i;
65
66 if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
67 return -1;
68 }
69
70 *digest = g_new0(char, (resultlen * 2) + 1);
71 for (i = 0 ; i < resultlen ; i++) {
72 (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
73 (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
74 }
75 (*digest)[resultlen * 2] = '\0';
76 g_free(result);
77 return 0;
78 }
79
80 int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
81 const char *buf,
82 size_t len,
83 char **digest,
84 Error **errp)
85 {
86 struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
87
88 return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
89 }
90
91 int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
92 const struct iovec *iov,
93 size_t niov,
94 char **base64,
95 Error **errp)
96 {
97 uint8_t *result = NULL;
98 size_t resultlen = 0;
99
100 if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
101 return -1;
102 }
103
104 *base64 = g_base64_encode(result, resultlen);
105 g_free(result);
106 return 0;
107 }
108
109 int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
110 const char *buf,
111 size_t len,
112 char **base64,
113 Error **errp)
114 {
115 struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
116
117 return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
118 }