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/*
* XTS mode, from IEEE P1619
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_XTS_H__
#define BOTAN_XTS_H__
#include <botan/basefilt.h>
#include <botan/block_cipher.h>
namespace Botan {
/*
* XTS Encryption
*/
class BOTAN_DLL XTS_Encryption : public Keyed_Filter
{
public:
void set_key(const SymmetricKey& key);
void set_iv(const InitializationVector& iv);
std::string name() const;
XTS_Encryption(BlockCipher* ciph);
XTS_Encryption(BlockCipher* ciph,
const SymmetricKey& key,
const InitializationVector& iv);
~XTS_Encryption() { delete cipher; delete cipher2; }
private:
void write(const byte[], u32bit);
void end_msg();
void encrypt(const byte block[]);
BlockCipher* cipher;
BlockCipher* cipher2;
SecureVector<byte> tweak;
SecureVector<byte> buffer;
u32bit position;
};
/*
* XTS Decryption
*/
class BOTAN_DLL XTS_Decryption : public Keyed_Filter
{
public:
void set_key(const SymmetricKey& key);
void set_iv(const InitializationVector& iv);
std::string name() const;
XTS_Decryption(BlockCipher* ciph);
XTS_Decryption(BlockCipher* ciph,
const SymmetricKey& key,
const InitializationVector& iv);
private:
void write(const byte[], u32bit);
void end_msg();
void decrypt(const byte[]);
BlockCipher* cipher;
BlockCipher* cipher2;
SecureVector<byte> tweak;
SecureVector<byte> buffer;
u32bit position;
};
}
#endif
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