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