/* * 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 2.1 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 "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, };