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