LXR qemu/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
  32typedef 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 */
  50void 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 */
  72void 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 */
  83