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

hash-gnutls.c (3084B)

      1/*
      2 * QEMU Crypto hash algorithms
      3 *
      4 * Copyright (c) 2021 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 <gnutls/crypto.h>
     23#include "qapi/error.h"
     24#include "crypto/hash.h"
     25#include "hashpriv.h"
     26
     27
     28static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
     29    [QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5,
     30    [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1,
     31    [QCRYPTO_HASH_ALG_SHA224] = GNUTLS_DIG_SHA224,
     32    [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
     33    [QCRYPTO_HASH_ALG_SHA384] = GNUTLS_DIG_SHA384,
     34    [QCRYPTO_HASH_ALG_SHA512] = GNUTLS_DIG_SHA512,
     35    [QCRYPTO_HASH_ALG_RIPEMD160] = GNUTLS_DIG_RMD160,
     36};
     37
     38gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
     39{
     40    size_t i;
     41    const gnutls_digest_algorithm_t *algs;
     42    if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
     43        qcrypto_hash_alg_map[alg] == GNUTLS_DIG_UNKNOWN) {
     44        return false;
     45    }
     46    algs = gnutls_digest_list();
     47    for (i = 0; algs[i] != GNUTLS_DIG_UNKNOWN; i++) {
     48        if (algs[i] == qcrypto_hash_alg_map[alg]) {
     49            return true;
     50        }
     51    }
     52    return false;
     53}
     54
     55
     56static int
     57qcrypto_gnutls_hash_bytesv(QCryptoHashAlgorithm alg,
     58                           const struct iovec *iov,
     59                           size_t niov,
     60                           uint8_t **result,
     61                           size_t *resultlen,
     62                           Error **errp)
     63{
     64    int i, ret;
     65    gnutls_hash_hd_t hash;
     66
     67    if (!qcrypto_hash_supports(alg)) {
     68        error_setg(errp,
     69                   "Unknown hash algorithm %d",
     70                   alg);
     71        return -1;
     72    }
     73
     74    ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]);
     75    if (*resultlen == 0) {
     76        *resultlen = ret;
     77        *result = g_new0(uint8_t, *resultlen);
     78    } else if (*resultlen != ret) {
     79        error_setg(errp,
     80                   "Result buffer size %zu is smaller than hash %d",
     81                   *resultlen, ret);
     82        return -1;
     83    }
     84
     85    ret = gnutls_hash_init(&hash, qcrypto_hash_alg_map[alg]);
     86    if (ret < 0) {
     87        error_setg(errp,
     88                   "Unable to initialize hash algorithm: %s",
     89                   gnutls_strerror(ret));
     90        return -1;
     91    }
     92
     93    for (i = 0; i < niov; i++) {
     94        gnutls_hash(hash, iov[i].iov_base, iov[i].iov_len);
     95    }
     96
     97    gnutls_hash_deinit(hash, *result);
     98    return 0;
     99}
    100
    101
    102QCryptoHashDriver qcrypto_hash_lib_driver = {
    103    .hash_bytesv = qcrypto_gnutls_hash_bytesv,
    104};