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 "crypto/ivgen-plain.h" 23 24 static int qcrypto_ivgen_plain_init(QCryptoIVGen *ivgen, 25 const uint8_t *key, size_t nkey, 26 Error **errp) 27 { 28 return 0; 29 } 30 31 static int qcrypto_ivgen_plain_calculate(QCryptoIVGen *ivgen, 32 uint64_t sector, 33 uint8_t *iv, size_t niv, 34 Error **errp) 35 { 36 size_t ivprefix; 37 ivprefix = sizeof(sector); 38 sector = cpu_to_le64(sector); 39 if (ivprefix > niv) { 40 ivprefix = niv; 41 } 42 memcpy(iv, §or, ivprefix); 43 if (ivprefix < niv) { 44 memset(iv + ivprefix, 0, niv - ivprefix); 45 } 46 return 0; 47 } 48 49 static void qcrypto_ivgen_plain_cleanup(QCryptoIVGen *ivgen) 50 { 51 } 52 53 54 struct QCryptoIVGenDriver qcrypto_ivgen_plain64 = { 55 .init = qcrypto_ivgen_plain_init, 56 .calculate = qcrypto_ivgen_plain_calculate, 57 .cleanup = qcrypto_ivgen_plain_cleanup, 58 }; 59 60