qemu

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/*
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 * QEMU Crypto block IV generator - plain
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 *
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 * Copyright (c) 2015-2016 Red Hat, Inc.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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 *
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 */
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#include "qemu/osdep.h"
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#include "qemu/bswap.h"
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#include "ivgen-plain.h"
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static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,
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                                    const uint8_t *key, size_t nkey,
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                                    Error **errp)
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{
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    return 0;
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}
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static int qcrypto_ivgen_plain_calculate(QCryptoIVGen *ivgen,
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                                         uint64_t sector,
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                                         uint8_t *iv, size_t niv,
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                                         Error **errp)
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{
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    size_t ivprefix;
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    ivprefix = sizeof(sector);
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    sector = cpu_to_le64(sector);
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    if (ivprefix > niv) {
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        ivprefix = niv;
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    }
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    memcpy(iv, &sector, ivprefix);
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    if (ivprefix < niv) {
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        memset(iv + ivprefix, 0, niv - ivprefix);
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    }
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    return 0;
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}
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static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen)
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{
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}
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struct QCryptoIVGenDriver qcrypto_ivgen_plain64 = {
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    .init = qcrypto_ivgen_plain_init,
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    .calculate = qcrypto_ivgen_plain_calculate,
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    .cleanup = qcrypto_ivgen_plain_cleanup,
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};
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