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-glib.c (2776B)

      1/*
      2 * QEMU Crypto hash algorithms
      3 *
      4 * Copyright (c) 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 "qapi/error.h"
     23#include "crypto/hash.h"
     24#include "hashpriv.h"
     25
     26
     27static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG__MAX] = {
     28    [QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5,
     29    [QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1,
     30    [QCRYPTO_HASH_ALG_SHA224] = -1,
     31    [QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256,
     32    [QCRYPTO_HASH_ALG_SHA384] = -1,
     33    [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512,
     34    [QCRYPTO_HASH_ALG_RIPEMD160] = -1,
     35};
     36
     37gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
     38{
     39    if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map) &&
     40        qcrypto_hash_alg_map[alg] != -1) {
     41        return true;
     42    }
     43    return false;
     44}
     45
     46
     47static int
     48qcrypto_glib_hash_bytesv(QCryptoHashAlgorithm alg,
     49                         const struct iovec *iov,
     50                         size_t niov,
     51                         uint8_t **result,
     52                         size_t *resultlen,
     53                         Error **errp)
     54{
     55    int i, ret;
     56    GChecksum *cs;
     57
     58    if (!qcrypto_hash_supports(alg)) {
     59        error_setg(errp,
     60                   "Unknown hash algorithm %d",
     61                   alg);
     62        return -1;
     63    }
     64
     65    cs = g_checksum_new(qcrypto_hash_alg_map[alg]);
     66
     67    for (i = 0; i < niov; i++) {
     68        g_checksum_update(cs, iov[i].iov_base, iov[i].iov_len);
     69    }
     70
     71    ret = g_checksum_type_get_length(qcrypto_hash_alg_map[alg]);
     72    if (ret < 0) {
     73        error_setg(errp, "%s",
     74                   "Unable to get hash length");
     75        goto error;
     76    }
     77    if (*resultlen == 0) {
     78        *resultlen = ret;
     79        *result = g_new0(uint8_t, *resultlen);
     80    } else if (*resultlen != ret) {
     81        error_setg(errp,
     82                   "Result buffer size %zu is smaller than hash %d",
     83                   *resultlen, ret);
     84        goto error;
     85    }
     86
     87    g_checksum_get_digest(cs, *result, resultlen);
     88
     89    g_checksum_free(cs);
     90    return 0;
     91
     92 error:
     93    g_checksum_free(cs);
     94    return -1;
     95}
     96
     97
     98QCryptoHashDriver qcrypto_hash_lib_driver = {
     99    .hash_bytesv = qcrypto_glib_hash_bytesv,
    100};