📄 des.h

📁 DES对称密钥加密算法,基于最基本的电码本模式.
💻 H
📖 第 1 页 / 共 2 页
字号:
12 下一页
#ifndef _DES_H
#define _DES_H

#include <stdio.h>
#include <windows.h>
#include <conio.h>

#define ERROR_SUCCESSED 255
#define ERROR_BITOUTOFRANGE 254
typedef unsigned char UCHAR;
UCHAR IP[8][8]=
{//初始置换表
	{58,50,42,34,26,18,10,2},
	{60,52,44,36,28,20,12,4},
	{62,54,46,38,30,22,14,6},
	{64,56,48,40,32,24,16,8},
	{57,49,41,33,25,17,9,1},
	{59,51,43,35,27,19,11,3},
	{61,53,45,37,29,21,13,5},
	{63,55,47,39,31,23,15,7}
};
UCHAR ANTI_IP[8][8]=
{//逆初始置换表
	{40,8,48,16,56,24,64,32},
	{39,7,47,15,55,23,63,31},
	{38,6,46,14,54,22,62,30},
	{37,5,45,13,53,21,61,29},
	{36,4,44,12,52,20,60,28},
	{35,3,43,11,51,19,59,27},
	{34,2,42,10,50,18,58,26},
	{33,1,41,9,49,17,57,25}
};
UCHAR PC_1[8][7]=
{//密钥置换选择1表
	{57,49,41,33,25,17,9},
	{1,58,50,42,34,26,18},
	{10,2,59,51,43,35,27},
	{19,11,3,60,52,44,36},
	{63,55,47,39,31,23,15},
	{7,62,54,46,38,30,22},
	{14,6,61,53,45,37,29},
	{21,13,5,28,20,12,4}
};
UCHAR uLeftShiftCount[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};//左移次数表
UCHAR PC_2[6][8]=
{//密钥置换选择2表
	{14,17,11,24,1,5,3,28},
	{15,6,21,10,23,19,12,4},
	{26,8,16,7,27,20,13,2},
	{41,52,31,37,47,55,30,40},
	{51,45,33,48,44,49,39,56},
	{34,53,46,42,50,36,29,32}
};
UCHAR E_BOX[8][6]=
{//E盒，扩充/置换表
	{32,1,2,3,4,5},
	{4,5,6,7,8,9},
	{8,9,10,11,12,13},
	{12,13,14,15,16,17},
	{16,17,18,19,20,21},
	{20,21,22,23,24,25},
	{24,25,26,27,28,29},
	{28,29,30,31,32,1}
};
UCHAR S_BOX[8][4][16]=
{//S盒，代换/选择表
	{
		{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},
		{0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},
		{4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},
		{15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}
	},
	{
		{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},
		{3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},
		{0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},
		{13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}
	},
	{
		{10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8},
		{13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1},
		{13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7},
		{1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12}
	},
	{
		{7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15},
		{13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9},
		{10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4},
		{3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14}
	},
	{
		{2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9},
		{14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6},
		{4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14},
		{11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3}
	},
	{
		{12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11},
		{10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8},
		{9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6},
		{4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13}
	},
	{
		{4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1},
		{13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6},
		{1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2},
		{6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}
	},
	{
		{13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7},
		{1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2},
		{7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8},
		{2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11}
	}
};
UCHAR P_BOX[4][8]=
{//置换P盒
	{16,7,20,21,29,12,28,17},
	{1,15,23,26,5,18,31,10},
	{2,8,24,14,32,27,3,9},
	{19,13,30,6,22,11,4,25}
};
UCHAR uPlainText[8]={0};//明文
UCHAR uKey[8];//密钥
UCHAR uCipherText[8]={0};//密文
UCHAR uDecryptedText[8]={0};//解密明文
UCHAR uDecryptOut[8]={0};//解密输出
UCHAR uSubkeys[16][6];//子密钥表
UCHAR uAntiSubkeys[16][6];//逆子密钥表
void DES_EncryptFile(char *szPlainFile,char *szCipherFile,UCHAR uSubkeys[][6]);
void DES_DecryptFile(char *szCipherFile,char *szRecoveredFile,UCHAR uSubkeys[][6]);
void ShowBytes(UCHAR uData[],UCHAR uBytes);//以二进制格式显示数组
void ShowByte(UCHAR uData);//以二进制格式显示字节
UCHAR GetBit(UCHAR uData[],UCHAR uBytes,UCHAR uBit);//获得数组某位值
UCHAR GetBitFromSingleByte(UCHAR uData,UCHAR uBit);//获得单字节某位值
UCHAR SetBit(UCHAR uData[],UCHAR uBytes,UCHAR uBit,UCHAR uValue);//设置数组某位值
UCHAR SetBitOfSingleByte(UCHAR *uData,UCHAR uBit,UCHAR uValue);//设置单字节某位值
UCHAR PermuteSelectKey1(UCHAR uIn[],UCHAR uOut[]);//密钥初始置换选择1
UCHAR CycleLeftShift(UCHAR uData[],UCHAR uIndex);//循环左移
void SubkeyfCycleLeftShift(UCHAR uLeft[],UCHAR uRight[],UCHAR uIndex);//子密钥循环左移
UCHAR PermuteSelectKey2(UCHAR uIn[],UCHAR uOut[]);//密钥初始置换选择2(置换/紧缩)
UCHAR ExtendPermute(UCHAR uIn[],UCHAR uOut[]);//32bit明文的扩充置换,E盒
void XorBytes(UCHAR uPlainText[],UCHAR uSubKey[],UCHAR uBits);//数组异或
UCHAR SubstituteSelect(UCHAR uIn[],UCHAR uOut[]);//代换/选择,S盒
UCHAR Permute(UCHAR uData[]);//置换，P盒
UCHAR GenerateSubkey(UCHAR uIn[],UCHAR uOut[][6]);//生成子密钥表
UCHAR F_Function(UCHAR uRight[],UCHAR uSubkey[]);//轮函数
UCHAR PlainTextPermute(UCHAR uData[],UCHAR uTable[][8]);//明文初始置换、逆初始置换
UCHAR Exchange32bits(UCHAR uData[]);//明文互换32bit
UCHAR En_Decrypt(UCHAR uPlainText[],UCHAR uSubkeys[][6],UCHAR uCipherText[]);//加密  
UCHAR AntiSubkey(UCHAR uIn[][6],UCHAR uOut[][6]);//生成逆子密钥表

void DES_EncryptFile(char *szPlainFile,char *szCipherFile,UCHAR uSubkeys[][6])
{		
	FILE *fIn,*fOut;
    fIn=fopen(szPlainFile,"rb");
	fOut=fopen(szCipherFile,"wb+");
	while(fgetc(fIn)!=EOF)
	{
		fseek(fIn,-1L,SEEK_CUR);
		fread(uPlainText,8,1,fIn);
		En_Decrypt(uPlainText,uSubkeys,uCipherText);
		fwrite(uCipherText,8,1,fOut);
		ZeroMemory(uPlainText,8);
	}//加密结束
	fclose(fIn);
	fclose(fOut);

}
void DES_DecryptFile(char *szCipherFile,char *szRecoveredFile,UCHAR uSubkeys[][6])
{
	FILE *fIn,*fOut;
	fIn=fopen(szCipherFile,"rb");
	fOut=fopen(szRecoveredFile,"wb+");
	while(fgetc(fIn)!=EOF)
	{
		fseek(fIn,-1L,SEEK_CUR);
		fread(uCipherText,8,1,fIn);
		En_Decrypt(uCipherText,uAntiSubkeys,uDecryptOut);
		fwrite(uDecryptOut,8,1,fOut);
		for(int i=0;i<8;i++)
			putch(uDecryptOut[i]);
		ZeroMemory(uCipherText,8);
	}
	fclose(fIn);
	fclose(fOut);
}
UCHAR En_Decrypt(UCHAR uPlainText[],UCHAR uSubkeys[][6],UCHAR uCipherText[])
{//加解密,根据输入的参数执行加密或者解密
	UCHAR uRightBuff[4]={0};//用于缓存明文右32位数
	memcpy(uCipherText,uPlainText,8);//明文转存，uCipherText暂时存放明文，对之进行处理得密文
	PlainTextPermute(uCipherText,IP);//明文初始置换,用IP表
	UCHAR *uLeft=uCipherText; //左32位指针
	UCHAR *uRight=uCipherText+4;//右32位指针
	for(UCHAR i=1;i<=16;i++)		
	{//16轮迭代	
		memcpy(uRightBuff,uRight,4);//保存右32位
		F_Function(uRight,uSubkeys[i-1]);//轮函数，输入明文右32位和子密钥
		XorBytes(uRight,uLeft,4);//异或生成下一轮的右32位	
		memcpy(uLeft,uRightBuff,4);//当前轮的右32位赋予下一轮左32位	
	}
	Exchange32bits(uCipherText);//32位互换
	PlainTextPermute(uCipherText,ANTI_IP);//明文逆初始置换，用ANTI_IP表
    return ERROR_SUCCESSED;
}	
UCHAR AntiSubkey(UCHAR uIn[][6],UCHAR uOut[][6])
{//生成逆子密钥表
	for(UCHAR i=0;i<16;i++)
		memcpy(uOut[i],uIn[15-i],6);//字节逆序
    return ERROR_SUCCESSED;
}
UCHAR Exchange32bits(UCHAR uData[])
{//互换32bit
	UCHAR *uLeft=uData;
	UCHAR *uRight=uData+4;
	UCHAR uBuff[4]={0};
	memcpy(uBuff,uRight,4);
	memcpy(uRight,uLeft,4);
	memcpy(uLeft,uBuff,4);
	return ERROR_SUCCESSED;
}
void ShowBytes(UCHAR uData[],UCHAR uBytes)
{//二进制显示数组
	for(int i=0;i<uBytes*8;i++)
	{
		if(i%8==0 && i>0)
			printf(",");
		printf("%d",GetBit(uData,uBytes,uBytes*8-i));
	}
	printf("\n");
}
void ShowByte(UCHAR uData)
12 下一页
💿 文件大小 39 K
👤 上传用户 w5525
📂 所属分类加密解密
🏷️ 相关标签

#DES #对称 #密钥 #加密算法
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -