xref: /openbmc/qemu/crypto/hash-glib.c (revision 4a10982c)
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