/* * 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 "qapi/error.h" #include "crypto/pbkdf.h" #include "gcrypt.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; }