www.pudn.com > CipherSystem.rar > DESCipherSystem.h

#ifndef DES_CIPHER_SYSTEM_H 
#define DES_CIPHER_SYSTEM_H 
 
#include "MyCipherSystem.h" 
#include "GlobalConstArraysForDes.h" 
#include "GlobalFunctions.h" 
#include  
#include  
 
using std::deque; 
using std::string; 
 
typedef deque binary_stream; 
 
class DESCipherSystem : public EncryptSystem 
{ 
public: 
	void GetData(const string& input); 
	void GetKey(const string& key); 
	void Encrypt(); 
	void Decrypt(); 
 
private: 
	binary_stream subKeyStream48bit[16]; 
	binary_stream keyWord; 
private: 
 
	//初始变换 
	//return 64 bit binary stream after IP; ok 
	binary_stream IP(const binary_stream& BinaryStream64bit);   
	//逆初始变换 ok 
	binary_stream AthwartIP(const binary_stream& BinaryStream64bit); 
 
	//乘积变换 
	//return 64 bit binary stream 
	binary_stream ProductSwitch(const binary_stream& BinaryStream64bit,  
						 const binary_stream& keyStream64bit, int mark = 1);  
 
	//SUB 乘积变换, f函数 
	// input 32 bit binary stream, and the subKeyStream48bit[16] which is the member of the class 
	//		 and the subKeyStream48bit displace which named i; 
	// return 32 bit binary stream 
	binary_stream Ffunction(const binary_stream& BinaryStream32bit, int i); 
 
	//SUB of Ffunction, 扩展置换 
	//input 32 bit binary stream 
	//return 48 bit binary stream 
	binary_stream Expand(const binary_stream& BinaryStream32bit); 
 
	//SUB of Ffunction, S盒变换 
	//input 48 bit binary stream, and a global S table; 
	//return 32 bit binary stream 
	binary_stream SboxPermutation(const binary_stream& BinaryStream48bit); 
 
	//SUB of Ffunction, P盒变换 
	//input 32 bit binary stream, and a global p table; 
	//return 32 bit binary stream 
	binary_stream PboxPermutation(const binary_stream& BinaryStream32bit); 
 
	//SUB 乘积变换, 子密钥的生成 
	//input: 64 bit binary stream, attention:the 64 bit binary stream should be change into 56 bit in the function 
	//output: no ouput, but set the value of subKeyStream48bit[16] 
	void SubKeyCreation(const binary_stream& keyStream64bit); 
 
	//SUB 子密钥的生成, 置换选择1 
	//input: 56 bit binary stream(key), 28 bit binary stream C, 28 bit binary stream D, C and D should be empty 
	//       and a PC-1 table; 
	//output: return void, but change the value of C and D above 
	void PC_1(const binary_stream& keyStream56bit, binary_stream& keyStreamC28bit, binary_stream& keyStreamD28bit); 
 
	//SUB 子密钥的生成, 循环左移计算 
	//input: 28 bit key binary stream C and D,  
	//output: return void, the C and D's value will be changed 
	void CycleLeftShift(binary_stream& keyStreamC28bit, binary_stream& keyStreamD28bit, int round); 
 
	//SUB 子密钥的生成, 置换选择2 
	//input: 28 bit key binary stream C and D, and a PC-2 table 
	//output:return void , but set the value of the subKeyStream48bit[16]; 
	void PC_2(const binary_stream& keyStreamC28bit, const binary_stream& keyStreamD28bit, int displace); 
}; 
 
 
#endif //DES_CIPHER_SYSTEM_H