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