cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

pbkdf-gcrypt.c (2836B)

      1/*
      2 * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
      3 *
      4 * Copyright (c) 2015-2016 Red Hat, Inc.
      5 *
      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.
     10 *
     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.
     15 *
     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/>.
     18 *
     19 */
     20
     21#include "qemu/osdep.h"
     22#include <gcrypt.h>
     23#include "qapi/error.h"
     24#include "crypto/pbkdf.h"
     25
     26bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
     27{
     28    switch (hash) {
     29    case QCRYPTO_HASH_ALG_MD5:
     30    case QCRYPTO_HASH_ALG_SHA1:
     31    case QCRYPTO_HASH_ALG_SHA224:
     32    case QCRYPTO_HASH_ALG_SHA256:
     33    case QCRYPTO_HASH_ALG_SHA384:
     34    case QCRYPTO_HASH_ALG_SHA512:
     35    case QCRYPTO_HASH_ALG_RIPEMD160:
     36        return true;
     37    default:
     38        return false;
     39    }
     40}
     41
     42int qcrypto_pbkdf2(QCryptoHashAlgorithm hash,
     43                   const uint8_t *key, size_t nkey,
     44                   const uint8_t *salt, size_t nsalt,
     45                   uint64_t iterations,
     46                   uint8_t *out, size_t nout,
     47                   Error **errp)
     48{
     49    static const int hash_map[QCRYPTO_HASH_ALG__MAX] = {
     50        [QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5,
     51        [QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1,
     52        [QCRYPTO_HASH_ALG_SHA224] = GCRY_MD_SHA224,
     53        [QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256,
     54        [QCRYPTO_HASH_ALG_SHA384] = GCRY_MD_SHA384,
     55        [QCRYPTO_HASH_ALG_SHA512] = GCRY_MD_SHA512,
     56        [QCRYPTO_HASH_ALG_RIPEMD160] = GCRY_MD_RMD160,
     57    };
     58    int ret;
     59
     60    if (iterations > ULONG_MAX) {
     61        error_setg_errno(errp, ERANGE,
     62                         "PBKDF iterations %llu must be less than %lu",
     63                         (long long unsigned)iterations, ULONG_MAX);
     64        return -1;
     65    }
     66
     67    if (hash >= G_N_ELEMENTS(hash_map) ||
     68        hash_map[hash] == GCRY_MD_NONE) {
     69        error_setg_errno(errp, ENOSYS,
     70                         "PBKDF does not support hash algorithm %s",
     71                         QCryptoHashAlgorithm_str(hash));
     72        return -1;
     73    }
     74
     75    ret = gcry_kdf_derive(key, nkey, GCRY_KDF_PBKDF2,
     76                          hash_map[hash],
     77                          salt, nsalt, iterations,
     78                          nout, out);
     79    if (ret != 0) {
     80        error_setg(errp, "Cannot derive password: %s",
     81                   gcry_strerror(ret));
     82        return -1;
     83    }
     84
     85    return 0;
     86}