Botan  1.11.15
src/lib/block/twofish/twofish.h
Go to the documentation of this file.
00001 /*
00002 * Twofish
00003 * (C) 1999-2007 Jack Lloyd
00004 *
00005 * Botan is released under the Simplified BSD License (see license.txt)
00006 */
00007 
00008 #ifndef BOTAN_TWOFISH_H__
00009 #define BOTAN_TWOFISH_H__
00010 
00011 #include <botan/block_cipher.h>
00012 
00013 namespace Botan {
00014 
00015 /**
00016 * Twofish, an AES finalist
00017 */
00018 class BOTAN_DLL Twofish : public Block_Cipher_Fixed_Params<16, 16, 32, 8>
00019    {
00020    public:
00021       void encrypt_n(const byte in[], byte out[], size_t blocks) const;
00022       void decrypt_n(const byte in[], byte out[], size_t blocks) const;
00023 
00024       void clear();
00025       std::string name() const { return "Twofish"; }
00026       BlockCipher* clone() const { return new Twofish; }
00027    private:
00028       void key_schedule(const byte[], size_t);
00029 
00030       static void rs_mul(byte[4], byte, size_t);
00031 
00032       static const u32bit MDS0[256];
00033       static const u32bit MDS1[256];
00034       static const u32bit MDS2[256];
00035       static const u32bit MDS3[256];
00036       static const byte Q0[256];
00037       static const byte Q1[256];
00038       static const byte RS[32];
00039       static const byte EXP_TO_POLY[255];
00040       static const byte POLY_TO_EXP[255];
00041 
00042       secure_vector<u32bit> SB, RK;
00043    };
00044 
00045 }
00046 
00047 #endif