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     /* Cipher parameters */
  36     QCryptoCipherAlgo alg;
  37     QCryptoCipherMode mode;
  38     uint8_t *key;
  39     size_t nkey;
  40
  41     QCryptoCipher **free_ciphers;
  42     size_t max_free_ciphers;
  43     size_t n_free_ciphers;
  44     QCryptoIVGen *ivgen;
  45     QemuMutex mutex;
  46
  47     QCryptoHashAlgo kdfhash;
  48     size_t niv;
  49     uint64_t payload_offset; /* In bytes */
  50     uint64_t sector_size; /* In bytes */
  51
  52     bool detached_header; /* True if disk has a detached LUKS header */
  53 };
  54
  55 struct QCryptoBlockDriver {
  56     int (*open)(QCryptoBlock *block,
  57                 QCryptoBlockOpenOptions *options,
  58                 const char *optprefix,
  59                 QCryptoBlockReadFunc readfunc,
  60                 void *opaque,
  61                 unsigned int flags,
  62                 Error **errp);
  63
  64     int (*create)(QCryptoBlock *block,
  65                   QCryptoBlockCreateOptions *options,
  66                   const char *optprefix,
  67                   QCryptoBlockInitFunc initfunc,
  68                   QCryptoBlockWriteFunc writefunc,
  69                   void *opaque,
  70                   Error **errp);
  71
  72     int (*amend)(QCryptoBlock *block,
  73                  QCryptoBlockReadFunc readfunc,
  74                  QCryptoBlockWriteFunc writefunc,
  75                  void *opaque,
  76                  QCryptoBlockAmendOptions *options,
  77                  bool force,
  78                  Error **errp);
  79
  80     int (*get_info)(QCryptoBlock *block,
  81                     QCryptoBlockInfo *info,
  82                     Error **errp);
  83
  84     void (*cleanup)(QCryptoBlock *block);
  85
  86     int (*encrypt)(QCryptoBlock *block,
  87                    uint64_t startsector,
  88                    uint8_t *buf,
  89                    size_t len,
  90                    Error **errp);
  91     int (*decrypt)(QCryptoBlock *block,
  92                    uint64_t startsector,
  93                    uint8_t *buf,
  94                    size_t len,
  95                    Error **errp);
  96
  97     bool (*has_format)(const uint8_t *buf,
  98                        size_t buflen);
  99 };
 100
 101
 102 int qcrypto_block_cipher_decrypt_helper(QCryptoCipher *cipher,
 103                                         size_t niv,
 104                                         QCryptoIVGen *ivgen,
 105                                         int sectorsize,
 106                                         uint64_t offset,
 107                                         uint8_t *buf,
 108                                         size_t len,
 109                                         Error **errp);
 110
 111 int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher,
 112                                         size_t niv,
 113                                         QCryptoIVGen *ivgen,
 114                                         int sectorsize,
 115                                         uint64_t offset,
 116                                         uint8_t *buf,
 117                                         size_t len,
 118                                         Error **errp);
 119
 120 int qcrypto_block_decrypt_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_encrypt_helper(QCryptoBlock *block,
 128                                  int sectorsize,
 129                                  uint64_t offset,
 130                                  uint8_t *buf,
 131                                  size_t len,
 132                                  Error **errp);
 133
 134 int qcrypto_block_init_cipher(QCryptoBlock *block,
 135                               QCryptoCipherAlgo alg,
 136                               QCryptoCipherMode mode,
 137                               const uint8_t *key, size_t nkey,
 138                               Error **errp);
 139
 140 void qcrypto_block_free_cipher(QCryptoBlock *block);
 141
 142 #endif /* QCRYPTO_BLOCKPRIV_H */