ef834aa2b2
QAPI's 'prefix' feature can make the connection between enumeration
type and its constants less than obvious. It's best used with
restraint.
QCryptoHashAlgorithm has a 'prefix' that overrides the generated
enumeration constants' prefix to QCRYPTO_HASH_ALG.
We could simply drop 'prefix', but then the prefix becomes
QCRYPTO_HASH_ALGORITHM, which is rather long.
We could additionally rename the type to QCryptoHashAlg, but I think
the abbreviation "alg" is less than clear.
Rename the type to QCryptoHashAlgo instead. The prefix becomes to
QCRYPTO_HASH_ALGO.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20240904111836.3273842-12-armbru@redhat.com>
[Conflicts with merge commit 7bbadc60b5 resolved]
91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/*
|
|
* 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(QCryptoHashAlgo hash)
|
|
{
|
|
switch (hash) {
|
|
case QCRYPTO_HASH_ALGO_MD5:
|
|
case QCRYPTO_HASH_ALGO_SHA1:
|
|
case QCRYPTO_HASH_ALGO_SHA224:
|
|
case QCRYPTO_HASH_ALGO_SHA256:
|
|
case QCRYPTO_HASH_ALGO_SHA384:
|
|
case QCRYPTO_HASH_ALGO_SHA512:
|
|
case QCRYPTO_HASH_ALGO_RIPEMD160:
|
|
return qcrypto_hash_supports(hash);
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
int 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)
|
|
{
|
|
static const int hash_map[QCRYPTO_HASH_ALGO__MAX] = {
|
|
[QCRYPTO_HASH_ALGO_MD5] = GNUTLS_DIG_MD5,
|
|
[QCRYPTO_HASH_ALGO_SHA1] = GNUTLS_DIG_SHA1,
|
|
[QCRYPTO_HASH_ALGO_SHA224] = GNUTLS_DIG_SHA224,
|
|
[QCRYPTO_HASH_ALGO_SHA256] = GNUTLS_DIG_SHA256,
|
|
[QCRYPTO_HASH_ALGO_SHA384] = GNUTLS_DIG_SHA384,
|
|
[QCRYPTO_HASH_ALGO_SHA512] = GNUTLS_DIG_SHA512,
|
|
[QCRYPTO_HASH_ALGO_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",
|
|
QCryptoHashAlgo_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;
|
|
}
|