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/*
* XTS mode, from IEEE P1619
* (C) 2009,2013 Jack Lloyd
* (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_MODE_XTS_H__
#define BOTAN_MODE_XTS_H__
#include <botan/cipher_mode.h>
#include <botan/block_cipher.h>
namespace Botan {
/**
* IEEE P1619 XTS Mode
*/
class BOTAN_DLL XTS_Mode : public Cipher_Mode
{
public:
std::string name() const 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_length() const override;
bool valid_nonce_length(size_t n) const override;
void clear() override;
void reset() override;
protected:
explicit XTS_Mode(BlockCipher* cipher);
const byte* tweak() const { return m_tweak.data(); }
const BlockCipher& cipher() const { return *m_cipher; }
void update_tweak(size_t last_used);
private:
void start_msg(const byte nonce[], size_t nonce_len) override;
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 final : public XTS_Mode
{
public:
/**
* @param cipher underlying block cipher
*/
explicit XTS_Encryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
size_t process(uint8_t buf[], size_t size) override;
void finish(secure_vector<byte>& final_block, size_t offset = 0) override;
size_t output_length(size_t input_length) const override;
};
/**
* IEEE P1619 XTS Decryption
*/
class BOTAN_DLL XTS_Decryption final : public XTS_Mode
{
public:
/**
* @param cipher underlying block cipher
*/
explicit XTS_Decryption(BlockCipher* cipher) : XTS_Mode(cipher) {}
size_t process(uint8_t buf[], size_t size) override;
void finish(secure_vector<byte>& final_block, size_t offset = 0) override;
size_t output_length(size_t input_length) const override;
};
}
#endif
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