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 */
20
21 #include "qemu/osdep.h"
22 #include <gcrypt.h>
23 #include "qapi/error.h"
24 #include "crypto/pbkdf.h"
25
qcrypto_pbkdf2_supports(QCryptoHashAlgo hash)26 bool qcrypto_pbkdf2_supports(QCryptoHashAlgo hash)
27 {
28 switch (hash) {
29 case QCRYPTO_HASH_ALGO_MD5:
30 case QCRYPTO_HASH_ALGO_SHA1:
31 case QCRYPTO_HASH_ALGO_SHA224:
32 case QCRYPTO_HASH_ALGO_SHA256:
33 case QCRYPTO_HASH_ALGO_SHA384:
34 case QCRYPTO_HASH_ALGO_SHA512:
35 case QCRYPTO_HASH_ALGO_RIPEMD160:
36 #ifdef CONFIG_CRYPTO_SM3
37 case QCRYPTO_HASH_ALGO_SM3:
38 #endif
39 return qcrypto_hash_supports(hash);
40 default:
41 return false;
42 }
43 }
44
qcrypto_pbkdf2(QCryptoHashAlgo hash,const uint8_t * key,size_t nkey,const uint8_t * salt,size_t nsalt,uint64_t iterations,uint8_t * out,size_t nout,Error ** errp)45 int qcrypto_pbkdf2(QCryptoHashAlgo hash,
46 const uint8_t *key, size_t nkey,
47 const uint8_t *salt, size_t nsalt,
48 uint64_t iterations,
49 uint8_t *out, size_t nout,
50 Error **errp)
51 {
52 static const int hash_map[QCRYPTO_HASH_ALGO__MAX] = {
53 [QCRYPTO_HASH_ALGO_MD5] = GCRY_MD_MD5,
54 [QCRYPTO_HASH_ALGO_SHA1] = GCRY_MD_SHA1,
55 [QCRYPTO_HASH_ALGO_SHA224] = GCRY_MD_SHA224,
56 [QCRYPTO_HASH_ALGO_SHA256] = GCRY_MD_SHA256,
57 [QCRYPTO_HASH_ALGO_SHA384] = GCRY_MD_SHA384,
58 [QCRYPTO_HASH_ALGO_SHA512] = GCRY_MD_SHA512,
59 [QCRYPTO_HASH_ALGO_RIPEMD160] = GCRY_MD_RMD160,
60 #ifdef CONFIG_CRYPTO_SM3
61 [QCRYPTO_HASH_ALGO_SM3] = GCRY_MD_SM3,
62 #endif
63 };
64 int ret;
65
66 if (iterations > ULONG_MAX) {
67 error_setg_errno(errp, ERANGE,
68 "PBKDF iterations %llu must be less than %lu",
69 (long long unsigned)iterations, ULONG_MAX);
70 return -1;
71 }
72
73 if (hash >= G_N_ELEMENTS(hash_map) ||
74 hash_map[hash] == GCRY_MD_NONE) {
75 error_setg_errno(errp, ENOSYS,
76 "PBKDF does not support hash algorithm %s",
77 QCryptoHashAlgo_str(hash));
78 return -1;
79 }
80
81 ret = gcry_kdf_derive(key, nkey, GCRY_KDF_PBKDF2,
82 hash_map[hash],
83 salt, nsalt, iterations,
84 nout, out);
85 if (ret != 0) {
86 error_setg(errp, "Cannot derive password: %s",
87 gcry_strerror(ret));
88 return -1;
89 }
90
91 return 0;
92 }
93