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 2.1 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  * 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
  30 #define XTS_BLOCK_SIZE 16
  31
  32 typedef void xts_cipher_func(const void *ctx,
  33                              size_t length,
  34                              uint8_t *dst,
  35                              const uint8_t *src);
  36
  37 /**
  38  * xts_decrypt:
  39  * @datactx: the cipher context for data decryption
  40  * @tweakctx: the cipher context for tweak decryption
  41  * @encfunc: the cipher function for encryption
  42  * @decfunc: the cipher function for decryption
  43  * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
  44  * @length: the length of @dst and @src
  45  * @dst: buffer to hold the decrypted plaintext
  46  * @src: buffer providing the ciphertext
  47  *
  48  * Decrypts @src into @dst
  49  */
  50 void xts_decrypt(const void *datactx,
  51                  const void *tweakctx,
  52                  xts_cipher_func *encfunc,
  53                  xts_cipher_func *decfunc,
  54                  uint8_t *iv,
  55                  size_t length,
  56                  uint8_t *dst,
  57                  const uint8_t *src);
  58
  59 /**
  60  * xts_decrypt:
  61  * @datactx: the cipher context for data encryption
  62  * @tweakctx: the cipher context for tweak encryption
  63  * @encfunc: the cipher function for encryption
  64  * @decfunc: the cipher function for decryption
  65  * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
  66  * @length: the length of @dst and @src
  67  * @dst: buffer to hold the encrypted ciphertext
  68  * @src: buffer providing the plaintext
  69  *
  70  * Decrypts @src into @dst
  71  */
  72 void xts_encrypt(const void *datactx,
  73                  const void *tweakctx,
  74                  xts_cipher_func *encfunc,
  75                  xts_cipher_func *decfunc,
  76                  uint8_t *iv,
  77                  size_t length,
  78                  uint8_t *dst,
  79                  const uint8_t *src);
  80
  81
  82 #endif /* QCRYPTO_XTS_H */