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 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
  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     int (*get_info)(QCryptoBlock *block,
  57                     QCryptoBlockInfo *info,
  58                     Error **errp);
  59
  60     void (*cleanup)(QCryptoBlock *block);
  61
  62     int (*encrypt)(QCryptoBlock *block,
  63                    uint64_t startsector,
  64                    uint8_t *buf,
  65                    size_t len,
  66                    Error **errp);
  67     int (*decrypt)(QCryptoBlock *block,
  68                    uint64_t startsector,
  69                    uint8_t *buf,
  70                    size_t len,
  71                    Error **errp);
  72
  73     bool (*has_format)(const uint8_t *buf,
  74                        size_t buflen);
  75 };
  76
  77
  78 int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
  79                                  size_t niv,
  80                                  QCryptoIVGen *ivgen,
  81                                  int sectorsize,
  82                                  uint64_t startsector,
  83                                  uint8_t *buf,
  84                                  size_t len,
  85                                  Error **errp);
  86
  87 int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
  88                                  size_t niv,
  89                                  QCryptoIVGen *ivgen,
  90                                  int sectorsize,
  91                                  uint64_t startsector,
  92                                  uint8_t *buf,
  93                                  size_t len,
  94                                  Error **errp);
  95
  96 #endif /* QCRYPTO_BLOCKPRIV_H */