Merge remote-tracking branch 'remotes/kraxel/tags/pull-vga-20170103-1' into staging
[qemu.git] / crypto / ivgen-plain.c
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 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 "qemu/bswap.h"
24 #include "crypto/ivgen-plain.h"
25
26 static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,
27 const uint8_t *key, size_t nkey,
28 Error **errp)
29 {
30 return 0;
31 }
32
33 static int qcrypto_ivgen_plain_calculate(QCryptoIVGen *ivgen,
34 uint64_t sector,
35 uint8_t *iv, size_t niv,
36 Error **errp)
37 {
38 size_t ivprefix;
39 uint32_t shortsector = cpu_to_le32((sector & 0xffffffff));
40 ivprefix = sizeof(shortsector);
41 if (ivprefix > niv) {
42 ivprefix = niv;
43 }
44 memcpy(iv, &shortsector, ivprefix);
45 if (ivprefix < niv) {
46 memset(iv + ivprefix, 0, niv - ivprefix);
47 }
48 return 0;
49 }
50
51 static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen)
52 {
53 }
54
55
56 struct QCryptoIVGenDriver qcrypto_ivgen_plain = {
57 .init = qcrypto_ivgen_plain_init,
58 .calculate = qcrypto_ivgen_plain_calculate,
59 .cleanup = qcrypto_ivgen_plain_cleanup,
60 };
61