1 /* 2 * QEMU Crypto block device encryption 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 #ifndef QCRYPTO_BLOCK_PRIV_H__ 22 #define QCRYPTO_BLOCK_PRIV_H__ 23 24 #include "crypto/block.h" 25 26 typedef struct QCryptoBlockDriver QCryptoBlockDriver; 27 28 struct QCryptoBlock { 29 QCryptoBlockFormat format; 30 31 const QCryptoBlockDriver *driver; 32 void *opaque; 33 34 QCryptoCipher *cipher; 35 QCryptoIVGen *ivgen; 36 QCryptoHashAlgorithm kdfhash; 37 size_t niv; 38 uint64_t payload_offset; /* In bytes */ 39 }; 40 41 struct QCryptoBlockDriver { 42 int (*open)(QCryptoBlock *block, 43 QCryptoBlockOpenOptions *options, 44 QCryptoBlockReadFunc readfunc, 45 void *opaque, 46 unsigned int flags, 47 Error **errp); 48 49 int (*create)(QCryptoBlock *block, 50 QCryptoBlockCreateOptions *options, 51 QCryptoBlockInitFunc initfunc, 52 QCryptoBlockWriteFunc writefunc, 53 void *opaque, 54 Error **errp); 55 56 void (*cleanup)(QCryptoBlock *block); 57 58 int (*encrypt)(QCryptoBlock *block, 59 uint64_t startsector, 60 uint8_t *buf, 61 size_t len, 62 Error **errp); 63 int (*decrypt)(QCryptoBlock *block, 64 uint64_t startsector, 65 uint8_t *buf, 66 size_t len, 67 Error **errp); 68 69 bool (*has_format)(const uint8_t *buf, 70 size_t buflen); 71 }; 72 73 74 int qcrypto_block_decrypt_helper(QCryptoCipher *cipher, 75 size_t niv, 76 QCryptoIVGen *ivgen, 77 int sectorsize, 78 uint64_t startsector, 79 uint8_t *buf, 80 size_t len, 81 Error **errp); 82 83 int qcrypto_block_encrypt_helper(QCryptoCipher *cipher, 84 size_t niv, 85 QCryptoIVGen *ivgen, 86 int sectorsize, 87 uint64_t startsector, 88 uint8_t *buf, 89 size_t len, 90 Error **errp); 91 92 #endif /* QCRYPTO_BLOCK_PRIV_H__ */ 93