60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*
|
|
* QEMU Crypto block IV generator - plain
|
|
*
|
|
* Copyright (c) 2015-2016 Red Hat, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qemu/bswap.h"
|
|
#include "ivgen-plain.h"
|
|
|
|
static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,
|
|
const uint8_t *key, size_t nkey,
|
|
Error **errp)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int qcrypto_ivgen_plain_calculate(QCryptoIVGen *ivgen,
|
|
uint64_t sector,
|
|
uint8_t *iv, size_t niv,
|
|
Error **errp)
|
|
{
|
|
size_t ivprefix;
|
|
uint32_t shortsector = cpu_to_le32((sector & 0xffffffff));
|
|
ivprefix = sizeof(shortsector);
|
|
if (ivprefix > niv) {
|
|
ivprefix = niv;
|
|
}
|
|
memcpy(iv, &shortsector, ivprefix);
|
|
if (ivprefix < niv) {
|
|
memset(iv + ivprefix, 0, niv - ivprefix);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen)
|
|
{
|
|
}
|
|
|
|
|
|
struct QCryptoIVGenDriver qcrypto_ivgen_plain = {
|
|
.init = qcrypto_ivgen_plain_init,
|
|
.calculate = qcrypto_ivgen_plain_calculate,
|
|
.cleanup = qcrypto_ivgen_plain_cleanup,
|
|
};
|
|
|