| /* |
| * QEMU Crypto PBKDF support (Password-Based Key Derivation Function) |
| * |
| * Copyright (c) 2015-2016 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 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 <gcrypt.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_SHA256: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| int qcrypto_pbkdf2(QCryptoHashAlgorithm hash, |
| const uint8_t *key, size_t nkey, |
| const uint8_t *salt, size_t nsalt, |
| unsigned int iterations, |
| uint8_t *out, size_t nout, |
| Error **errp) |
| { |
| static const int hash_map[QCRYPTO_HASH_ALG__MAX] = { |
| [QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5, |
| [QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1, |
| [QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256, |
| }; |
| int ret; |
| |
| if (hash >= G_N_ELEMENTS(hash_map) || |
| hash_map[hash] == GCRY_MD_NONE) { |
| error_setg(errp, "Unexpected hash algorithm %d", hash); |
| return -1; |
| } |
| |
| ret = gcry_kdf_derive(key, nkey, GCRY_KDF_PBKDF2, |
| hash_map[hash], |
| salt, nsalt, iterations, |
| nout, out); |
| if (ret != 0) { |
| error_setg(errp, "Cannot derive password: %s", |
| gcry_strerror(ret)); |
| return -1; |
| } |
| |
| return 0; |
| } |