include/crypto/xts.h

   1 /*
   2  * QEMU Crypto XTS cipher mode
   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  * This code is originally derived from public domain / WTFPL code in
  20  * LibTomCrypt crytographic library http://libtom.org. The XTS code
  21  * was donated by Elliptic Semiconductor Inc (www.ellipticsemi.com)
  22  * to the LibTom Projects
  23  *
  24  */
  25
  26 #ifndef QCRYPTO_XTS_H
  27 #define QCRYPTO_XTS_H
  28
  29 #include "qemu-common.h"
  30 #include "qapi/error.h"
  31
  32
  33 #define XTS_BLOCK_SIZE 16
  34
  35 typedef void xts_cipher_func(const void *ctx,
  36                              size_t length,
  37                              uint8_t *dst,
  38                              const uint8_t *src);
  39
  40 /**
  41  * xts_decrypt:
  42  * @datactx: the cipher context for data decryption
  43  * @tweakctx: the cipher context for tweak decryption
  44  * @encfunc: the cipher function for encryption
  45  * @decfunc: the cipher function for decryption
  46  * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
  47  * @length: the length of @dst and @src
  48  * @dst: buffer to hold the decrypted plaintext
  49  * @src: buffer providing the ciphertext
  50  *
  51  * Decrypts @src into @dst
  52  */
  53 void xts_decrypt(const void *datactx,
  54                  const void *tweakctx,
  55                  xts_cipher_func *encfunc,
  56                  xts_cipher_func *decfunc,
  57                  uint8_t *iv,
  58                  size_t length,
  59                  uint8_t *dst,
  60                  const uint8_t *src);
  61
  62 /**
  63  * xts_decrypt:
  64  * @datactx: the cipher context for data encryption
  65  * @tweakctx: the cipher context for tweak encryption
  66  * @encfunc: the cipher function for encryption
  67  * @decfunc: the cipher function for decryption
  68  * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
  69  * @length: the length of @dst and @src
  70  * @dst: buffer to hold the encrypted ciphertext
  71  * @src: buffer providing the plaintext
  72  *
  73  * Decrypts @src into @dst
  74  */
  75 void xts_encrypt(const void *datactx,
  76                  const void *tweakctx,
  77                  xts_cipher_func *encfunc,
  78                  xts_cipher_func *decfunc,
  79                  uint8_t *iv,
  80                  size_t length,
  81                  uint8_t *dst,
  82                  const uint8_t *src);
  83
  84
  85 #endif /* QCRYPTO_XTS_H */