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 | |
25 | static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen, |
26 | const uint8_t *key, size_t nkey, |
27 | Error **errp) |
28 | { |
29 | return 0; |
30 | } |
31 | |
32 | static 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 | |
50 | static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen) |
51 | { |
52 | } |
53 | |
54 | |
55 | struct QCryptoIVGenDriver qcrypto_ivgen_plain = { |
56 | .init = qcrypto_ivgen_plain_init, |
57 | .calculate = qcrypto_ivgen_plain_calculate, |
58 | .cleanup = qcrypto_ivgen_plain_cleanup, |
59 | }; |
60 | |
61 | |