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_BLOCKPRIV_H 22 #define QCRYPTO_BLOCKPRIV_H 23 24 #include "crypto/block.h" 25 #include "qemu/thread.h" 26 27 typedef struct QCryptoBlockDriver QCryptoBlockDriver; 28 29 struct QCryptoBlock { 30 QCryptoBlockFormat format; 31 32 const QCryptoBlockDriver *driver; 33 void *opaque; 34 35 QCryptoCipher **ciphers; 36 size_t n_ciphers; 37 size_t n_free_ciphers; 38 QCryptoIVGen *ivgen; 39 QemuMutex mutex; 40 41 QCryptoHashAlgorithm kdfhash; 42 size_t niv; 43 uint64_t payload_offset; /* In bytes */ 44 uint64_t sector_size; /* In bytes */ 45 }; 46 47 struct QCryptoBlockDriver { 48 int (*open)(QCryptoBlock *block, 49 QCryptoBlockOpenOptions *options, 50 const char *optprefix, 51 QCryptoBlockReadFunc readfunc, 52 void *opaque, 53 unsigned int flags, 54 size_t n_threads, 55 Error **errp); 56 57 int (*create)(QCryptoBlock *block, 58 QCryptoBlockCreateOptions *options, 59 const char *optprefix, 60 QCryptoBlockInitFunc initfunc, 61 QCryptoBlockWriteFunc writefunc, 62 void *opaque, 63 Error **errp); 64 65 int (*get_info)(QCryptoBlock *block, 66 QCryptoBlockInfo *info, 67 Error **errp); 68 69 void (*cleanup)(QCryptoBlock *block); 70 71 int (*encrypt)(QCryptoBlock *block, 72 uint64_t startsector, 73 uint8_t *buf, 74 size_t len, 75 Error **errp); 76 int (*decrypt)(QCryptoBlock *block, 77 uint64_t startsector, 78 uint8_t *buf, 79 size_t len, 80 Error **errp); 81 82 bool (*has_format)(const uint8_t *buf, 83 size_t buflen); 84 }; 85 86 87 int qcrypto_block_cipher_decrypt_helper(QCryptoCipher *cipher, 88 size_t niv, 89 QCryptoIVGen *ivgen, 90 int sectorsize, 91 uint64_t offset, 92 uint8_t *buf, 93 size_t len, 94 Error **errp); 95 96 int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher, 97 size_t niv, 98 QCryptoIVGen *ivgen, 99 int sectorsize, 100 uint64_t offset, 101 uint8_t *buf, 102 size_t len, 103 Error **errp); 104 105 int qcrypto_block_decrypt_helper(QCryptoBlock *block, 106 int sectorsize, 107 uint64_t offset, 108 uint8_t *buf, 109 size_t len, 110 Error **errp); 111 112 int qcrypto_block_encrypt_helper(QCryptoBlock *block, 113 int sectorsize, 114 uint64_t offset, 115 uint8_t *buf, 116 size_t len, 117 Error **errp); 118 119 int qcrypto_block_init_cipher(QCryptoBlock *block, 120 QCryptoCipherAlgorithm alg, 121 QCryptoCipherMode mode, 122 const uint8_t *key, size_t nkey, 123 size_t n_threads, Error **errp); 124 125 void qcrypto_block_free_cipher(QCryptoBlock *block); 126 127 #endif /* QCRYPTO_BLOCKPRIV_H */ 128