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/*
* QEMU Crypto XTS cipher mode
*
* Copyright (c) 2015-2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* This code is originally derived from public domain / WTFPL code in
* LibTomCrypt crytographic library http://libtom.org. The XTS code
* was donated by Elliptic Semiconductor Inc (www.ellipticsemi.com)
* to the LibTom Projects
*
*/
#ifndef QCRYPTO_XTS_H_
#define QCRYPTO_XTS_H_
#include "qemu-common.h"
#include "qapi/error.h"
#define XTS_BLOCK_SIZE 16
typedef void xts_cipher_func(const void *ctx,
size_t length,
uint8_t *dst,
const uint8_t *src);
/**
* xts_decrypt:
* @datactx: the cipher context for data decryption
* @tweakctx: the cipher context for tweak decryption
* @encfunc: the cipher function for encryption
* @decfunc: the cipher function for decryption
* @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
* @length: the length of @dst and @src
* @dst: buffer to hold the decrypted plaintext
* @src: buffer providing the ciphertext
*
* Decrypts @src into @dst
*/
void xts_decrypt(const void *datactx,
const void *tweakctx,
xts_cipher_func *encfunc,
xts_cipher_func *decfunc,
uint8_t *iv,
size_t length,
uint8_t *dst,
const uint8_t *src);
/**
* xts_decrypt:
* @datactx: the cipher context for data encryption
* @tweakctx: the cipher context for tweak encryption
* @encfunc: the cipher function for encryption
* @decfunc: the cipher function for decryption
* @iv: the initialization vector tweak of XTS_BLOCK_SIZE bytes
* @length: the length of @dst and @src
* @dst: buffer to hold the encrypted ciphertext
* @src: buffer providing the plaintext
*
* Decrypts @src into @dst
*/
void xts_encrypt(const void *datactx,
const void *tweakctx,
xts_cipher_func *encfunc,
xts_cipher_func *decfunc,
uint8_t *iv,
size_t length,
uint8_t *dst,
const uint8_t *src);
#endif /* QCRYPTO_XTS_H_ */
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