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/*
* CAST-256
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_CAST256_H__
#define BOTAN_CAST256_H__
#include <botan/block_cipher.h>
namespace Botan {
/*
* CAST-256
*/
class BOTAN_DLL CAST_256 : public BlockCipher
{
public:
void clear() throw() { MK.clear(); RK.clear(); }
std::string name() const { return "CAST-256"; }
BlockCipher* clone() const { return new CAST_256; }
CAST_256() : BlockCipher(16, 4, 32, 4) {}
private:
void encrypt_n(const byte in[], byte out[], u32bit blocks) const;
void decrypt_n(const byte in[], byte out[], u32bit blocks) const;
void key_schedule(const byte[], u32bit);
static const u32bit KEY_MASK[192];
static const byte KEY_ROT[32];
SecureBuffer<u32bit, 48> MK;
SecureBuffer<byte, 48> RK;
};
extern const u32bit CAST_SBOX1[256];
extern const u32bit CAST_SBOX2[256];
extern const u32bit CAST_SBOX3[256];
extern const u32bit CAST_SBOX4[256];
}
#endif
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