Daniel P. Berrange | cb73089 | 2015-10-15 12:35:28 +0100 | [diff] [blame] | 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 |
Thomas Huth | b7cbb87 | 2019-02-13 16:54:59 +0100 | [diff] [blame] | 9 | * version 2.1 of the License, or (at your option) any later version. |
Daniel P. Berrange | cb73089 | 2015-10-15 12:35:28 +0100 | [diff] [blame] | 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" |
Markus Armbruster | 7136fc1 | 2016-03-11 09:20:17 +0100 | [diff] [blame] | 22 | #include "qemu/bswap.h" |
Michael S. Tsirkin | 986bc8d | 2018-05-03 22:50:23 +0300 | [diff] [blame] | 23 | #include "ivgen-plain.h" |
Daniel P. Berrange | cb73089 | 2015-10-15 12:35:28 +0100 | [diff] [blame] | 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 | |