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/*
* Luby-Rackoff
* (C) 1999-2008,2014 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_LUBY_RACKOFF_H__
#define BOTAN_LUBY_RACKOFF_H__
#include <botan/block_cipher.h>
#include <botan/hash.h>
#include <memory>
namespace Botan {
/**
* Luby-Rackoff block cipher construction
*/
class BOTAN_DLL LubyRackoff : public BlockCipher
{
public:
void encrypt_n(const byte in[], byte out[], size_t blocks) const override;
void decrypt_n(const byte in[], byte out[], size_t blocks) const override;
size_t block_size() const override { return 2 * m_hash->output_length(); }
Key_Length_Specification key_spec() const override
{
return Key_Length_Specification(2, 32, 2);
}
void clear() override;
std::string name() const override;
BlockCipher* clone() const override;
/**
* @param hash function to use to form the block cipher
*/
LubyRackoff(HashFunction* hash) : m_hash(hash) {}
private:
void key_schedule(const byte[], size_t) override;
std::unique_ptr<HashFunction> m_hash;
secure_vector<byte> m_K1, m_K2;
};
}
#endif
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