Merge tag 'qemu-macppc-20230206' of https://github.com/mcayland/qemu into staging
[qemu.git] / crypto / ivgen-plain64.c
blobb377036c19444e2faccecdea08a83c1f4bb4dc6f
1 /*
2 * QEMU Crypto block IV generator - plain
4 * Copyright (c) 2015-2016 Red Hat, Inc.
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.
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.
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/>.
21 #include "qemu/osdep.h"
22 #include "qemu/bswap.h"
23 #include "ivgen-plain.h"
25 static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen,
26 const uint8_t *key, size_t nkey,
27 Error **errp)
29 return 0;
32 static int qcrypto_ivgen_plain_calculate(QCryptoIVGen *ivgen,
33 uint64_t sector,
34 uint8_t *iv, size_t niv,
35 Error **errp)
37 size_t ivprefix;
38 ivprefix = sizeof(sector);
39 sector = cpu_to_le64(sector);
40 if (ivprefix > niv) {
41 ivprefix = niv;
43 memcpy(iv, &sector, ivprefix);
44 if (ivprefix < niv) {
45 memset(iv + ivprefix, 0, niv - ivprefix);
47 return 0;
50 static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen)
55 struct QCryptoIVGenDriver qcrypto_ivgen_plain64 = {
56 .init = qcrypto_ivgen_plain_init,
57 .calculate = qcrypto_ivgen_plain_calculate,
58 .cleanup = qcrypto_ivgen_plain_cleanup,