1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/*
* 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 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 "crypto/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,
};
|
