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 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
  31#define XTS_BLOCK_SIZE 16
  32
  33typedef void xts_cipher_func(const void *ctx,
  34                             size_t length,
  35                             uint8_t *dst,
  36                             const uint8_t *src);
  37
  38/**
  39 * xts_decrypt:
  40 * @datactx: the cipher context for data decryption
  41 * @tweakctx: the cipher context for tweak decryption
  42 * @encfunc: the cipher function for encryption
  43 * @decfunc: the cipher function for decryption
  44 * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
  45 * @length: the length of @dst and @src
  46 * @dst: buffer to hold the decrypted plaintext
  47 * @src: buffer providing the ciphertext
  48 *
  49 * Decrypts @src into @dst
  50 */
  51void xts_decrypt(const void *datactx,
  52                 const void *tweakctx,
  53                 xts_cipher_func *encfunc,
  54                 xts_cipher_func *decfunc,
  55                 uint8_t *iv,
  56                 size_t length,
  57                 uint8_t *dst,
  58                 const uint8_t *src);
  59
  60/**
  61 * xts_decrypt:
  62 * @datactx: the cipher context for data encryption
  63 * @tweakctx: the cipher context for tweak encryption
  64 * @encfunc: the cipher function for encryption
  65 * @decfunc: the cipher function for decryption
  66 * @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
  67 * @length: the length of @dst and @src
  68 * @dst: buffer to hold the encrypted ciphertext
  69 * @src: buffer providing the plaintext
  70 *
  71 * Decrypts @src into @dst
  72 */
  73void xts_encrypt(const void *datactx,
  74                 const void *tweakctx,
  75                 xts_cipher_func *encfunc,
  76                 xts_cipher_func *decfunc,
  77                 uint8_t *iv,
  78                 size_t length,
  79                 uint8_t *dst,
  80                 const uint8_t *src);
  81
  82
  83#endif /* QCRYPTO_XTS_H */
  84