Initial Source Code commit
Initial commit of original Tiberian Dawn and Red Alert source code converted to build as DLLs, and compatible with the release version of Command & Conquer Remastered.
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PG-SteveT
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114
REDALERT/BLOWFISH.H
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114
REDALERT/BLOWFISH.H
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//
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// Copyright 2020 Electronic Arts Inc.
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//
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is free
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// software: you can redistribute it and/or modify it under the terms of
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// the GNU General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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// TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
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// in the hope that it will be useful, but with permitted additional restrictions
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// under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
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// distributed with this program. You should have received a copy of the
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// GNU General Public License along with permitted additional restrictions
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// with this program. If not, see https://github.com/electronicarts/CnC_Remastered_Collection
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/* $Header: /CounterStrike/BLOWFISH.H 1 3/03/97 10:24a Joe_bostic $ */
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/***********************************************************************************************
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*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
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***********************************************************************************************
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* *
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* Project Name : Command & Conquer *
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* *
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* File Name : BLOWFISH.H *
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* *
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* Programmer : Joe L. Bostic *
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* *
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* Start Date : 04/14/96 *
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* *
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* Last Update : April 14, 1996 [JLB] *
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#ifndef BLOWFISH_H
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#define BLOWFISH_H
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#include <limits.h>
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/*
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** The "bool" integral type was defined by the C++ committee in
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** November of '94. Until the compiler supports this, use the following
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** definition.
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*/
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#ifndef __BORLANDC__
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#ifndef TRUE_FALSE_DEFINED
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#define TRUE_FALSE_DEFINED
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enum {false=0,true=1};
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typedef int bool;
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#endif
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#endif
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/*
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** This engine will process data blocks by encryption and decryption.
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** The "Blowfish" algorithm is in the public domain. It uses
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** a Feistal network (similar to IDEA). It has no known
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** weaknesses, but is still relatively new. Blowfish is particularly strong
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** against brute force attacks. It is also quite strong against linear and
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** differential cryptanalysis. Its weakness is that it takes a relatively
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** long time to set up with a new key (1/100th of a second on a P6-200).
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** The time to set up a key is equivalent to encrypting 4240 bytes.
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*/
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class BlowfishEngine {
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public:
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BlowfishEngine(void) : IsKeyed(false) {}
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~BlowfishEngine(void);
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void Submit_Key(void const * key, int length);
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int Encrypt(void const * plaintext, int length, void * cyphertext);
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int Decrypt(void const * cyphertext, int length, void * plaintext);
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/*
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** This is the maximum key length supported.
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*/
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enum {MAX_KEY_LENGTH=56};
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private:
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bool IsKeyed;
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void Sub_Key_Encrypt(unsigned long & left, unsigned long & right);
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void Process_Block(void const * plaintext, void * cyphertext, unsigned long const * ptable);
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void Initialize_Tables(void);
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enum {
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ROUNDS = 16, // Feistal round count (16 is standard).
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BYTES_PER_BLOCK=8 // The number of bytes in each cypher block (don't change).
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};
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/*
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** Initialization data for sub keys. The initial values are constant and
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** filled with a number generated from pi. Thus they are not random but
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** they don't hold a weak pattern either.
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*/
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static unsigned long const P_Init[(int)ROUNDS+2];
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static unsigned long const S_Init[4][UCHAR_MAX+1];
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/*
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** Permutation tables for encryption and decryption.
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*/
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unsigned long P_Encrypt[(int)ROUNDS+2];
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unsigned long P_Decrypt[(int)ROUNDS+2];
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/*
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** S-Box tables (four).
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*/
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unsigned long bf_S[4][UCHAR_MAX+1];
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};
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#endif
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