MAINTAINERS: Cover docs/igd-assign.txt in VFIO section
[qemu/ar7.git] / crypto / pbkdf-gcrypt.c
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1 /*
2  * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
3  *
4  * Copyright (c) 2015-2016 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  */
21 #include "qemu/osdep.h"
22 #include <gcrypt.h>
23 #include "qapi/error.h"
24 #include "crypto/pbkdf.h"
26 bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
28     switch (hash) {
29     case QCRYPTO_HASH_ALG_MD5:
30     case QCRYPTO_HASH_ALG_SHA1:
31     case QCRYPTO_HASH_ALG_SHA224:
32     case QCRYPTO_HASH_ALG_SHA256:
33     case QCRYPTO_HASH_ALG_SHA384:
34     case QCRYPTO_HASH_ALG_SHA512:
35     case QCRYPTO_HASH_ALG_RIPEMD160:
36         return true;
37     default:
38         return false;
39     }
42 int qcrypto_pbkdf2(QCryptoHashAlgorithm hash,
43                    const uint8_t *key, size_t nkey,
44                    const uint8_t *salt, size_t nsalt,
45                    uint64_t iterations,
46                    uint8_t *out, size_t nout,
47                    Error **errp)
49     static const int hash_map[QCRYPTO_HASH_ALG__MAX] = {
50         [QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5,
51         [QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1,
52         [QCRYPTO_HASH_ALG_SHA224] = GCRY_MD_SHA224,
53         [QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256,
54         [QCRYPTO_HASH_ALG_SHA384] = GCRY_MD_SHA384,
55         [QCRYPTO_HASH_ALG_SHA512] = GCRY_MD_SHA512,
56         [QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MD_RMD160,
57     };
58     int ret;
60     if (iterations > ULONG_MAX) {
61         error_setg_errno(errp, ERANGE,
62                          "PBKDF iterations %llu must be less than %lu",
63                          (long long unsigned)iterations, ULONG_MAX);
64         return -1;
65     }
67     if (hash >= G_N_ELEMENTS(hash_map) ||
68         hash_map[hash] == GCRY_MD_NONE) {
69         error_setg_errno(errp, ENOSYS,
70                          "PBKDF does not support hash algorithm %s",
71                          QCryptoHashAlgorithm_str(hash));
72         return -1;
73     }
75     ret = gcry_kdf_derive(key, nkey, GCRY_KDF_PBKDF2,
76                           hash_map[hash],
77                           salt, nsalt, iterations,
78                           nout, out);
79     if (ret != 0) {
80         error_setg(errp, "Cannot derive password: %s",
81                    gcry_strerror(ret));
82         return -1;
83     }
85     return 0;