mirror of
https://github.com/electronicarts/CnC_Remastered_Collection
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03416d24e1
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.
91 lines
4.3 KiB
C++
91 lines
4.3 KiB
C++
//
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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/PK.H 1 3/03/97 10:25a 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 : PK.H *
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* *
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* Programmer : Joe L. Bostic *
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* *
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* Start Date : 07/03/96 *
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* *
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* Last Update : July 3, 1996 [JLB] *
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#ifndef PK_H
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#define PK_H
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#include "int.h"
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/*
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** This class holds a public or private key used in Public Key Cryptography. It also serves
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** as the conduit for encrypting/decrypting data using that key. Cryptography, using this
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** method, has a couple of characteristics that affect how it is used. One, the process of
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** encrypting/decrypting is very slow. This limits the effective quantity of data that can
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** be processed. Two, the ciphertext is larger than the plaintext. This property generally
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** limits its use to streaming data as opposed to random access data. The data is processed
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** in blocks. The size of the ciphertext and plaintext blocks can be determined only from
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** the key itself.
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**
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** A reasonable use of this technology would be to encrypt only critical data such as the
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** password for a fast general purpose cryptographic algorithm.
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*/
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class PKey
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{
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public:
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PKey(void) : Modulus(0), Exponent(0), BitPrecision(0) {}
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PKey(void const * exponent, void const * modulus); // DER initialization.
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int Encrypt(void const * source, int slen, void * dest) const;
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int Decrypt(void const * source, int slen, void * dest) const;
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static void Generate(Straw & random, int bits, PKey & fastkey, PKey & slowkey);
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int Plain_Block_Size(void) const {return((BitPrecision-1)/8);}
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int Crypt_Block_Size(void) const {return(Plain_Block_Size()+1);}
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int Block_Count(int plaintext_length) const {return((((plaintext_length-1)/Plain_Block_Size())+1));}
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int Encode_Modulus(void * buffer) const;
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int Encode_Exponent(void * buffer) const;
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void Decode_Modulus(void * buffer);
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void Decode_Exponent(void * buffer);
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static long Fast_Exponent(void) {return(65537L);}
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private:
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// p*q
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BigInt Modulus;
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// 65537 or
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// inverse of (p-1)(q-1).
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BigInt Exponent;
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// Maximum bits allowed for block.
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int BitPrecision;
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};
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#endif
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