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/*
* Serpent
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SERPENT_H__
#define BOTAN_SERPENT_H__
#include <botan/block_cipher.h>
namespace Botan {
/**
* Serpent is the most conservative of the AES finalists
* http://www.cl.cam.ac.uk/~rja14/serpent.html
*/
class BOTAN_DLL Serpent final : public Block_Cipher_Fixed_Params<16, 16, 32, 8>
{
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;
void clear() override;
const char* provider() const override;
std::string name() const override { return "Serpent"; }
BlockCipher* clone() const override { return new Serpent; }
size_t parallelism() const override { return 4; }
protected:
#if defined(BOTAN_HAS_SERPENT_SIMD)
/**
* Encrypt 4 blocks in parallel using SSE2 or AltiVec
*/
void simd_encrypt_4(const byte in[64], byte out[64]) const;
/**
* Decrypt 4 blocks in parallel using SSE2 or AltiVec
*/
void simd_decrypt_4(const byte in[64], byte out[64]) const;
#endif
/**
* For use by subclasses using SIMD, asm, etc
* @return const reference to the key schedule
*/
const secure_vector<u32bit>& get_round_keys() const
{ return m_round_key; }
/**
* For use by subclasses that implement the key schedule
* @param ks is the new key schedule value to set
*/
void set_round_keys(const u32bit ks[132])
{
m_round_key.assign(&ks[0], &ks[132]);
}
private:
void key_schedule(const byte key[], size_t length) override;
secure_vector<u32bit> m_round_key;
};
}
#endif
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