2 * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
4 * Copyright (c) 2021 Red Hat, Inc.
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.
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.
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/>.
21 #include "qemu/osdep.h"
22 #include <gnutls/crypto.h>
23 #include "qapi/error.h"
24 #include "crypto/pbkdf.h"
26 bool qcrypto_pbkdf2_supports(QCryptoHashAlgo 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 return qcrypto_hash_supports(hash
);
42 int qcrypto_pbkdf2(QCryptoHashAlgo hash
,
43 const uint8_t *key
, size_t nkey
,
44 const uint8_t *salt
, size_t nsalt
,
46 uint8_t *out
, size_t nout
,
49 static const int hash_map
[QCRYPTO_HASH_ALGO__MAX
] = {
50 [QCRYPTO_HASH_ALGO_MD5
] = GNUTLS_DIG_MD5
,
51 [QCRYPTO_HASH_ALGO_SHA1
] = GNUTLS_DIG_SHA1
,
52 [QCRYPTO_HASH_ALGO_SHA224
] = GNUTLS_DIG_SHA224
,
53 [QCRYPTO_HASH_ALGO_SHA256
] = GNUTLS_DIG_SHA256
,
54 [QCRYPTO_HASH_ALGO_SHA384
] = GNUTLS_DIG_SHA384
,
55 [QCRYPTO_HASH_ALGO_SHA512
] = GNUTLS_DIG_SHA512
,
56 [QCRYPTO_HASH_ALGO_RIPEMD160
] = GNUTLS_DIG_RMD160
,
59 const gnutls_datum_t gkey
= { (unsigned char *)key
, nkey
};
60 const gnutls_datum_t gsalt
= { (unsigned char *)salt
, nsalt
};
62 if (iterations
> ULONG_MAX
) {
63 error_setg_errno(errp
, ERANGE
,
64 "PBKDF iterations %llu must be less than %lu",
65 (long long unsigned)iterations
, ULONG_MAX
);
69 if (hash
>= G_N_ELEMENTS(hash_map
) ||
70 hash_map
[hash
] == GNUTLS_DIG_UNKNOWN
) {
71 error_setg_errno(errp
, ENOSYS
,
72 "PBKDF does not support hash algorithm %s",
73 QCryptoHashAlgo_str(hash
));
77 ret
= gnutls_pbkdf2(hash_map
[hash
],
84 error_setg(errp
, "Cannot derive password: %s",
85 gnutls_strerror(ret
));