Merge tag 'pull-request-2022-09-28' of https://gitlab.com/thuth/qemu into staging
[qemu.git] / crypto / hash-gnutls.c
1 /*
2 * QEMU Crypto hash algorithms
3 *
4 * Copyright (c) 2021 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 2.1 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 <gnutls/crypto.h>
23 #include "qapi/error.h"
24 #include "crypto/hash.h"
25 #include "hashpriv.h"
26
27
28 static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
29 [QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5,
30 [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1,
31 [QCRYPTO_HASH_ALG_SHA224] = GNUTLS_DIG_SHA224,
32 [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
33 [QCRYPTO_HASH_ALG_SHA384] = GNUTLS_DIG_SHA384,
34 [QCRYPTO_HASH_ALG_SHA512] = GNUTLS_DIG_SHA512,
35 [QCRYPTO_HASH_ALG_RIPEMD160] = GNUTLS_DIG_RMD160,
36 };
37
38 gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
39 {
40 size_t i;
41 const gnutls_digest_algorithm_t *algs;
42 if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
43 qcrypto_hash_alg_map[alg] == GNUTLS_DIG_UNKNOWN) {
44 return false;
45 }
46 algs = gnutls_digest_list();
47 for (i = 0; algs[i] != GNUTLS_DIG_UNKNOWN; i++) {
48 if (algs[i] == qcrypto_hash_alg_map[alg]) {
49 return true;
50 }
51 }
52 return false;
53 }
54
55
56 static int
57 qcrypto_gnutls_hash_bytesv(QCryptoHashAlgorithm alg,
58 const struct iovec *iov,
59 size_t niov,
60 uint8_t **result,
61 size_t *resultlen,
62 Error **errp)
63 {
64 int i, ret;
65 gnutls_hash_hd_t hash;
66
67 if (!qcrypto_hash_supports(alg)) {
68 error_setg(errp,
69 "Unknown hash algorithm %d",
70 alg);
71 return -1;
72 }
73
74 ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]);
75 if (*resultlen == 0) {
76 *resultlen = ret;
77 *result = g_new0(uint8_t, *resultlen);
78 } else if (*resultlen != ret) {
79 error_setg(errp,
80 "Result buffer size %zu is smaller than hash %d",
81 *resultlen, ret);
82 return -1;
83 }
84
85 ret = gnutls_hash_init(&hash, qcrypto_hash_alg_map[alg]);
86 if (ret < 0) {
87 error_setg(errp,
88 "Unable to initialize hash algorithm: %s",
89 gnutls_strerror(ret));
90 return -1;
91 }
92
93 for (i = 0; i < niov; i++) {
94 gnutls_hash(hash, iov[i].iov_base, iov[i].iov_len);
95 }
96
97 gnutls_hash_deinit(hash, *result);
98 return 0;
99 }
100
101
102 QCryptoHashDriver qcrypto_hash_lib_driver = {
103 .hash_bytesv = qcrypto_gnutls_hash_bytesv,
104 };