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/*
* XTS mode, from IEEE P1619
* (C) 2009,2013 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_MODE_XTS_H__
#define BOTAN_MODE_XTS_H__
#include <botan/cipher_mode.h>
#include <botan/block_cipher.h>
#include <memory>
namespace Botan {
/**
* IEEE P1619 XTS Mode
*/
class BOTAN_DLL XTS_Mode : public Cipher_Mode
{
public:
std::string name() const override;
secure_vector<byte> start(const byte nonce[], size_t nonce_len) override;
size_t update_granularity() const override;
size_t minimum_final_size() const override;
Key_Length_Specification key_spec() const override;
size_t default_nonce_size() const override;
bool valid_nonce_length(size_t n) const override;
void clear();
protected:
XTS_Mode(BlockCipher* cipher);
const byte* tweak() const { return &m_tweak[0]; }
const BlockCipher& cipher() const { return *m_cipher; }
void update_tweak(size_t last_used);
private:
void key_schedule(const byte key[], size_t length) override;
std::unique_ptr<BlockCipher> m_cipher, m_tweak_cipher;
secure_vector<byte> m_tweak;
};
/**
* IEEE P1619 XTS Encryption
*/
class BOTAN_DLL XTS_Encryption : public XTS_Mode
{
public:
XTS_Encryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
void update(secure_vector<byte>& blocks, size_t offset) override;
void finish(secure_vector<byte>& final_block, size_t offset) override;
size_t output_length(size_t input_length) const override;
};
/**
* IEEE P1619 XTS Decryption
*/
class BOTAN_DLL XTS_Decryption : public XTS_Mode
{
public:
XTS_Decryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
void update(secure_vector<byte>& blocks, size_t offset) override;
void finish(secure_vector<byte>& final_block, size_t offset) override;
size_t output_length(size_t input_length) const override;
};
}
#endif
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