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     uint64_t sector_size; /* In bytes */
  40 };
  41
  42 struct QCryptoBlockDriver {
  43     int (*open)(QCryptoBlock *block,
  44                 QCryptoBlockOpenOptions *options,
  45                 const char *optprefix,
  46                 QCryptoBlockReadFunc readfunc,
  47                 void *opaque,
  48                 unsigned int flags,
  49                 Error **errp);
  50
  51     int (*create)(QCryptoBlock *block,
  52                   QCryptoBlockCreateOptions *options,
  53                   const char *optprefix,
  54                   QCryptoBlockInitFunc initfunc,
  55                   QCryptoBlockWriteFunc writefunc,
  56                   void *opaque,
  57                   Error **errp);
  58
  59     int (*get_info)(QCryptoBlock *block,
  60                     QCryptoBlockInfo *info,
  61                     Error **errp);
  62
  63     void (*cleanup)(QCryptoBlock *block);
  64
  65     int (*encrypt)(QCryptoBlock *block,
  66                    uint64_t startsector,
  67                    uint8_t *buf,
  68                    size_t len,
  69                    Error **errp);
  70     int (*decrypt)(QCryptoBlock *block,
  71                    uint64_t startsector,
  72                    uint8_t *buf,
  73                    size_t len,
  74                    Error **errp);
  75
  76     bool (*has_format)(const uint8_t *buf,
  77                        size_t buflen);
  78 };
  79
  80
  81 int qcrypto_block_decrypt_helper(QCryptoCipher *cipher,
  82                                  size_t niv,
  83                                  QCryptoIVGen *ivgen,
  84                                  int sectorsize,
  85                                  uint64_t offset,
  86                                  uint8_t *buf,
  87                                  size_t len,
  88                                  Error **errp);
  89
  90 int qcrypto_block_encrypt_helper(QCryptoCipher *cipher,
  91                                  size_t niv,
  92                                  QCryptoIVGen *ivgen,
  93                                  int sectorsize,
  94                                  uint64_t offset,
  95                                  uint8_t *buf,
  96                                  size_t len,
  97                                  Error **errp);
  98
  99 #endif /* QCRYPTO_BLOCKPRIV_H */