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/*
* Block Cipher Cascade
* (C) 2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_CASCADE_H__
#define BOTAN_CASCADE_H__
#include <botan/block_cipher.h>
namespace Botan {
/**
* Block Cipher Cascade
*/
class BOTAN_PUBLIC_API(2,0) Cascade_Cipher final : public BlockCipher
{
public:
void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
size_t block_size() const override { return m_block; }
Key_Length_Specification key_spec() const override
{
return Key_Length_Specification(m_cipher1->maximum_keylength() +
m_cipher2->maximum_keylength());
}
void clear() override;
std::string name() const override;
BlockCipher* clone() const override;
/**
* Create a cascade of two block ciphers
* @param cipher1 the first cipher
* @param cipher2 the second cipher
*/
Cascade_Cipher(BlockCipher* cipher1, BlockCipher* cipher2);
Cascade_Cipher(const Cascade_Cipher&) = delete;
Cascade_Cipher& operator=(const Cascade_Cipher&) = delete;
private:
void key_schedule(const uint8_t[], size_t) override;
size_t m_block;
std::unique_ptr<BlockCipher> m_cipher1, m_cipher2;
};
}
#endif
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