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
  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 (*amend)(QCryptoBlock *block,
  66                  QCryptoBlockReadFunc readfunc,
  67                  QCryptoBlockWriteFunc writefunc,
  68                  void *opaque,
  69                  QCryptoBlockAmendOptions *options,
  70                  bool force,
  71                  Error **errp);
  72
  73     int (*get_info)(QCryptoBlock *block,
  74                     QCryptoBlockInfo *info,
  75                     Error **errp);
  76
  77     void (*cleanup)(QCryptoBlock *block);
  78
  79     int (*encrypt)(QCryptoBlock *block,
  80                    uint64_t startsector,
  81                    uint8_t *buf,
  82                    size_t len,
  83                    Error **errp);
  84     int (*decrypt)(QCryptoBlock *block,
  85                    uint64_t startsector,
  86                    uint8_t *buf,
  87                    size_t len,
  88                    Error **errp);
  89
  90     bool (*has_format)(const uint8_t *buf,
  91                        size_t buflen);
  92 };
  93
  94
  95 int qcrypto_block_cipher_decrypt_helper(QCryptoCipher *cipher,
  96                                         size_t niv,
  97                                         QCryptoIVGen *ivgen,
  98                                         int sectorsize,
  99                                         uint64_t offset,
 100                                         uint8_t *buf,
 101                                         size_t len,
 102                                         Error **errp);
 103
 104 int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher,
 105                                         size_t niv,
 106                                         QCryptoIVGen *ivgen,
 107                                         int sectorsize,
 108                                         uint64_t offset,
 109                                         uint8_t *buf,
 110                                         size_t len,
 111                                         Error **errp);
 112
 113 int qcrypto_block_decrypt_helper(QCryptoBlock *block,
 114                                  int sectorsize,
 115                                  uint64_t offset,
 116                                  uint8_t *buf,
 117                                  size_t len,
 118                                  Error **errp);
 119
 120 int qcrypto_block_encrypt_helper(QCryptoBlock *block,
 121                                  int sectorsize,
 122                                  uint64_t offset,
 123                                  uint8_t *buf,
 124                                  size_t len,
 125                                  Error **errp);
 126
 127 int qcrypto_block_init_cipher(QCryptoBlock *block,
 128                               QCryptoCipherAlgorithm alg,
 129                               QCryptoCipherMode mode,
 130                               const uint8_t *key, size_t nkey,
 131                               size_t n_threads, Error **errp);
 132
 133 void qcrypto_block_free_cipher(QCryptoBlock *block);
 134
 135 #endif /* QCRYPTO_BLOCKPRIV_H */