crypto/blockpriv.h

   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 2.1 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     bool detached_header; /* True if disk has a detached LUKS header */
  47 };
  48
  49 struct QCryptoBlockDriver {
  50     int (*open)(QCryptoBlock *block,
  51                 QCryptoBlockOpenOptions *options,
  52                 const char *optprefix,
  53                 QCryptoBlockReadFunc readfunc,
  54                 void *opaque,
  55                 unsigned int flags,
  56                 size_t n_threads,
  57                 Error **errp);
  58
  59     int (*create)(QCryptoBlock *block,
  60                   QCryptoBlockCreateOptions *options,
  61                   const char *optprefix,
  62                   QCryptoBlockInitFunc initfunc,
  63                   QCryptoBlockWriteFunc writefunc,
  64                   void *opaque,
  65                   Error **errp);
  66
  67     int (*amend)(QCryptoBlock *block,
  68                  QCryptoBlockReadFunc readfunc,
  69                  QCryptoBlockWriteFunc writefunc,
  70                  void *opaque,
  71                  QCryptoBlockAmendOptions *options,
  72                  bool force,
  73                  Error **errp);
  74
  75     int (*get_info)(QCryptoBlock *block,
  76                     QCryptoBlockInfo *info,
  77                     Error **errp);
  78
  79     void (*cleanup)(QCryptoBlock *block);
  80
  81     int (*encrypt)(QCryptoBlock *block,
  82                    uint64_t startsector,
  83                    uint8_t *buf,
  84                    size_t len,
  85                    Error **errp);
  86     int (*decrypt)(QCryptoBlock *block,
  87                    uint64_t startsector,
  88                    uint8_t *buf,
  89                    size_t len,
  90                    Error **errp);
  91
  92     bool (*has_format)(const uint8_t *buf,
  93                        size_t buflen);
  94 };
  95
  96
  97 int qcrypto_block_cipher_decrypt_helper(QCryptoCipher *cipher,
  98                                         size_t niv,
  99                                         QCryptoIVGen *ivgen,
 100                                         int sectorsize,
 101                                         uint64_t offset,
 102                                         uint8_t *buf,
 103                                         size_t len,
 104                                         Error **errp);
 105
 106 int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher,
 107                                         size_t niv,
 108                                         QCryptoIVGen *ivgen,
 109                                         int sectorsize,
 110                                         uint64_t offset,
 111                                         uint8_t *buf,
 112                                         size_t len,
 113                                         Error **errp);
 114
 115 int qcrypto_block_decrypt_helper(QCryptoBlock *block,
 116                                  int sectorsize,
 117                                  uint64_t offset,
 118                                  uint8_t *buf,
 119                                  size_t len,
 120                                  Error **errp);
 121
 122 int qcrypto_block_encrypt_helper(QCryptoBlock *block,
 123                                  int sectorsize,
 124                                  uint64_t offset,
 125                                  uint8_t *buf,
 126                                  size_t len,
 127                                  Error **errp);
 128
 129 int qcrypto_block_init_cipher(QCryptoBlock *block,
 130                               QCryptoCipherAlgorithm alg,
 131                               QCryptoCipherMode mode,
 132                               const uint8_t *key, size_t nkey,
 133                               size_t n_threads, Error **errp);
 134
 135 void qcrypto_block_free_cipher(QCryptoBlock *block);
 136
 137 #endif /* QCRYPTO_BLOCKPRIV_H */