cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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ivgen-plain.c (1846B)

      1/*
      2 * QEMU Crypto block IV generator - plain
      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 "qemu/bswap.h"
     23#include "ivgen-plain.h"
     24
     25static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,
     26                                    const uint8_t *key, size_t nkey,
     27                                    Error **errp)
     28{
     29    return 0;
     30}
     31
     32static int qcrypto_ivgen_plain_calculate(QCryptoIVGen *ivgen,
     33                                         uint64_t sector,
     34                                         uint8_t *iv, size_t niv,
     35                                         Error **errp)
     36{
     37    size_t ivprefix;
     38    uint32_t shortsector = cpu_to_le32((sector & 0xffffffff));
     39    ivprefix = sizeof(shortsector);
     40    if (ivprefix > niv) {
     41        ivprefix = niv;
     42    }
     43    memcpy(iv, &shortsector, ivprefix);
     44    if (ivprefix < niv) {
     45        memset(iv + ivprefix, 0, niv - ivprefix);
     46    }
     47    return 0;
     48}
     49
     50static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen)
     51{
     52}
     53
     54
     55struct QCryptoIVGenDriver qcrypto_ivgen_plain = {
     56    .init = qcrypto_ivgen_plain_init,
     57    .calculate = qcrypto_ivgen_plain_calculate,
     58    .cleanup = qcrypto_ivgen_plain_cleanup,
     59};
     60