1 /*
2 * QEMU Crypto hash algorithms
3 *
4 * Copyright (c) 2016 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 "qapi/error.h"
23 #include "crypto/hash.h"
24 #include "hashpriv.h"
25
26
27 static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
28 [QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5,
29 [QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
30 [QCRYPTO_HASH_ALG_SHA224] = -1,
31 [QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
32 [QCRYPTO_HASH_ALG_SHA384] = -1,
33 [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
34 [QCRYPTO_HASH_ALG_RIPEMD160] = -1,
35 };
36
qcrypto_hash_supports(QCryptoHashAlgorithm alg)37 gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
38 {
39 if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
40 qcrypto_hash_alg_map[alg] != -1) {
41 return true;
42 }
43 return false;
44 }
45
46
47 static int
qcrypto_glib_hash_bytesv(QCryptoHashAlgorithm alg,const struct iovec * iov,size_t niov,uint8_t ** result,size_t * resultlen,Error ** errp)48 qcrypto_glib_hash_bytesv(QCryptoHashAlgorithm alg,
49 const struct iovec *iov,
50 size_t niov,
51 uint8_t **result,
52 size_t *resultlen,
53 Error **errp)
54 {
55 int i, ret;
56 GChecksum *cs;
57
58 if (!qcrypto_hash_supports(alg)) {
59 error_setg(errp,
60 "Unknown hash algorithm %d",
61 alg);
62 return -1;
63 }
64
65 cs = g_checksum_new(qcrypto_hash_alg_map[alg]);
66
67 for (i = 0; i < niov; i++) {
68 g_checksum_update(cs, iov[i].iov_base, iov[i].iov_len);
69 }
70
71 ret = g_checksum_type_get_length(qcrypto_hash_alg_map[alg]);
72 if (ret < 0) {
73 error_setg(errp, "%s",
74 "Unable to get hash length");
75 goto error;
76 }
77 if (*resultlen == 0) {
78 *resultlen = ret;
79 *result = g_new0(uint8_t, *resultlen);
80 } else if (*resultlen != ret) {
81 error_setg(errp,
82 "Result buffer size %zu is smaller than hash %d",
83 *resultlen, ret);
84 goto error;
85 }
86
87 g_checksum_get_digest(cs, *result, resultlen);
88
89 g_checksum_free(cs);
90 return 0;
91
92 error:
93 g_checksum_free(cs);
94 return -1;
95 }
96
97
98 QCryptoHashDriver qcrypto_hash_lib_driver = {
99 .hash_bytesv = qcrypto_glib_hash_bytesv,
100 };
101