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/*
* QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
*
* Copyright (c) 2021 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include "qemu/osdep.h"
#include <gnutls/crypto.h>
#include "qapi/error.h"
#include "crypto/pbkdf.h"
bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
{
switch (hash) {
case QCRYPTO_HASH_ALG_MD5:
case QCRYPTO_HASH_ALG_SHA1:
case QCRYPTO_HASH_ALG_SHA224:
case QCRYPTO_HASH_ALG_SHA256:
case QCRYPTO_HASH_ALG_SHA384:
case QCRYPTO_HASH_ALG_SHA512:
case QCRYPTO_HASH_ALG_RIPEMD160:
return true;
default:
return false;
}
}
int qcrypto_pbkdf2(QCryptoHashAlgorithm 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)
{
static const int hash_map[QCRYPTO_HASH_ALG__MAX] = {
[QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5,
[QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1,
[QCRYPTO_HASH_ALG_SHA224] = GNUTLS_DIG_SHA224,
[QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
[QCRYPTO_HASH_ALG_SHA384] = GNUTLS_DIG_SHA384,
[QCRYPTO_HASH_ALG_SHA512] = GNUTLS_DIG_SHA512,
[QCRYPTO_HASH_ALG_RIPEMD160] = GNUTLS_DIG_RMD160,
};
int ret;
const gnutls_datum_t gkey = { (unsigned char *)key, nkey };
const gnutls_datum_t gsalt = { (unsigned char *)salt, nsalt };
if (iterations > ULONG_MAX) {
error_setg_errno(errp, ERANGE,
"PBKDF iterations %llu must be less than %lu",
(long long unsigned)iterations, ULONG_MAX);
return -1;
}
if (hash >= G_N_ELEMENTS(hash_map) ||
hash_map[hash] == GNUTLS_DIG_UNKNOWN) {
error_setg_errno(errp, ENOSYS,
"PBKDF does not support hash algorithm %s",
QCryptoHashAlgorithm_str(hash));
return -1;
}
ret = gnutls_pbkdf2(hash_map[hash],
&gkey,
&gsalt,
iterations,
out,
nout);
if (ret != 0) {
error_setg(errp, "Cannot derive password: %s",
gnutls_strerror(ret));
return -1;
}
return 0;
}
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