blowfish.hpp

SSL加密库源码

/* blowfish.hpp                                
 *
 * Copyright (C) 2003 Sawtooth Consulting Ltd.
 *
 * This file is part of yaSSL, an SSL implementation written by Todd A Ouska
 * (todd at yassl.com, see www.yassl.com).
 *
 * yaSSL is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * There are special exceptions to the terms and conditions of the GPL as it
 * is applied to yaSSL. View the full text of the exception in the file
 * FLOSS-EXCEPTIONS in the directory of this software distribution.
 *
 * yaSSL is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */

/* blowfish.hpp defines Blowfish
*/


#ifndef TAO_CRYPT_BLOWFISH_HPP
#define TAO_CRYPT_BLOWFISH_HPP

#include "misc.hpp"
#include "modes.hpp"
#ifdef USE_SYS_STL
    #include <algorithm>
#else
    #include "algorithm.hpp"
#endif


namespace STL = STL_NAMESPACE;


#if defined(TAOCRYPT_X86ASM_AVAILABLE) && defined(TAO_ASM)
    #define DO_BLOWFISH_ASM
#endif


namespace TaoCrypt {

enum { BLOWFISH_BLOCK_SIZE = 8 };


// Blowfish encryption and decryption, see 
class Blowfish : public Mode_BASE {
public:
    enum { BLOCK_SIZE = BLOWFISH_BLOCK_SIZE, ROUNDS = 16 };

    Blowfish(CipherDir DIR, Mode MODE)
        : Mode_BASE(BLOCK_SIZE, DIR, MODE) {}

#ifdef DO_BLOWFISH_ASM
    void Process(byte*, const byte*, word32);
#endif
    void SetKey(const byte* key, word32 sz, CipherDir fake = ENCRYPTION);
    void SetIV(const byte* iv) { memcpy(r_, iv, BLOCK_SIZE); }
private:
    static const word32 p_init_[ROUNDS + 2];
    static const word32 s_init_[4 * 256];

    word32 pbox_[ROUNDS + 2];
    word32 sbox_[4 * 256];

    void crypt_block(const word32 in[2], word32 out[2]) const;
    void AsmProcess(const byte* in, byte* out) const;
    void ProcessAndXorBlock(const byte*, const byte*, byte*) const;

    Blowfish(const Blowfish&);            // hide copy
    Blowfish& operator=(const Blowfish&); // and assign
};


typedef BlockCipher<ENCRYPTION, Blowfish, ECB> Blowfish_ECB_Encryption;
typedef BlockCipher<DECRYPTION, Blowfish, ECB> Blowfish_ECB_Decryption;

typedef BlockCipher<ENCRYPTION, Blowfish, CBC> Blowfish_CBC_Encryption;
typedef BlockCipher<DECRYPTION, Blowfish, CBC> Blowfish_CBC_Decryption;



} // namespace

#endif // TAO_CRYPT_BLOWFISH_HPP