/*-------------------------------------------------------
??????Data?Encryption?Standard??56位密鑰加密64位數(shù)據(jù)?
				??2011.10
--------------------------------------------------------*/
#include?
#include?
#include?“bool.h“???//?位處理?
#include?“tables.h“

void?BitsCopy（bool?*DatOutbool?*DatInint?Len）;??//?數(shù)組復(fù)制?

void?ByteToBit（bool?*DatOutchar?*DatInint?Num）;?//?字節(jié)到位?
void?BitToByte（char?*DatOutbool?*DatInint?Num）;?//?位到字節(jié)

void?BitToHex（char?*DatOutbool?*DatInint?Num）;??//?二進(jìn)制到十六進(jìn)制?64位?to?4*16字符
void?HexToBit（bool?*DatOutchar?*DatInint?Num）;??//?十六進(jìn)制到二進(jìn)制?

void?TablePermute（bool?*DatOutbool?*DatInconst?char?*Tableint?Num）;?//?位表置換函數(shù)?
void?LoopMove（bool?*DatInint?Lenint?Num）;?????//?循環(huán)左移?Len長(zhǎng)度?Num移動(dòng)位數(shù)?
void?Xor（bool?*DatAbool?*DatBint?Num）;?????????//?異或函數(shù)?

void?S_Change（bool?DatOut[32]bool?DatIn[48]）;???//?S盒變換?
void?F_Change（bool?DatIn[32]bool?DatKi[48]）;????//?F函數(shù)??????????????????????????????????

void?SetKey（char?KeyIn[8]）;?????????????????????????//?設(shè)置密鑰
void?PlayDes（char?MesOut[8]char?MesIn[8]）;???????//?執(zhí)行DES加密
void?KickDes（char?MesOut[8]char?MesIn[8]）;?????????????//?執(zhí)行DES解密?

?

int?main（）
{
	int?i=0;?
	char?MesHex[16]={0};?????????//?16個(gè)字符數(shù)組用于存放?64位16進(jìn)制的密文
?	char?MyKey[8]={0};???????????//?初始密鑰?8字節(jié)*8
	char?YourKey[8]={0};?????????//?輸入的解密密鑰?8字節(jié)*8
	char?MyMessage[8]={0};???????//?初始明文?
	
/*-----------------------------------------------*/

	printf（“Welcome!?Please?input?your?Message（64?bit）:\n“）;
	gets（MyMessage）;????????????//?明文
	printf（“Please?input?your?Secret?Key:\n“）;
	gets（MyKey）;????????????????//?密鑰

	while（MyKey[i]!=‘\0‘）????????//?計(jì)算密鑰長(zhǎng)度
	{
		i++;
	}

	while（i!=8）??????????????????//?不是8?提示錯(cuò)誤
	{
		printf（“Please?input?a?correct?Secret?Key!\n“）;
		gets（MyKey）;
		i=0;
		while（MyKey[i]!=‘\0‘）????//?再次檢測(cè)
		{
			i++;
		}
	}

	SetKey（MyKey）;???????????????//?設(shè)置密鑰?得到子密鑰Ki
	
	PlayDes（MesHexMyMessage）;???//?執(zhí)行DES加密

	printf（“Your?Message?is?Encrypted!:\n“）;??//?信息已加密
	for（i=0;i<16;i++）???????????
	{
		printf（“%c?“MesHex[i]）;
	}
	printf（“\n“）;
	printf（“\n“）;
	
	printf（“Please?input?your?Secret?Key?to?Deciphering:\n“）;??//?請(qǐng)輸入密鑰以解密
	gets（YourKey）;?????????????????????????????????????????//?得到密鑰
	SetKey（YourKey）;???????????????????????????????????????//?設(shè)置密鑰

	KickDes（MyMessageMesHex）;?????????????????????//?解密輸出到MyMessage
	
	printf（“Deciphering?Over?!!:\n“）;?????????????????????//?解密結(jié)束
	for（i=0;i<8;i++）
	{
		printf（“%c?“MyMessage[i]）;
	}
	printf（“\n“）;
	system（“pause“）;
		
/*------------------------------------------------*/	
}

/*-------------------------------
?把DatIn開(kāi)始的長(zhǎng)度位Len位的二進(jìn)制
?復(fù)制到DatOut后
--------------------------------*/
void?BitsCopy（bool?*DatOutbool?*DatInint?Len）?????//?數(shù)組復(fù)制?OK?
{
	int?i=0;
	for（i=0;i	{
		DatOut[i]=DatIn[i];
	}
}

/*-------------------------------
?字節(jié)轉(zhuǎn)換成位函數(shù)?
?每8次換一個(gè)字節(jié)?每次向右移一位
?和1與取最后一位?共64位?
--------------------------------*/
void?ByteToBit（bool?*DatOutch

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-09-10?16:00??DES\
?????目錄???????????0??2017-09-10?15:58??DES\Debug\
?????文件??????192581??2017-09-10?15:59??DES\Debug\DES.exe
?????文件??????206596??2017-09-10?15:59??DES\Debug\DES.ilk
?????文件??????185800??2017-09-10?15:58??DES\Debug\DES.pch
?????文件??????484352??2017-09-10?15:59??DES\Debug\DES.pdb
?????文件???????17731??2017-09-10?15:59??DES\Debug\main.obj
?????文件???????33792??2017-09-10?15:59??DES\Debug\vc60.idb
?????文件???????45056??2017-09-10?15:59??DES\Debug\vc60.pdb
?????文件????????4248??2011-10-07?22:29??DES\DES.dsp
?????文件?????????514??2011-10-07?21:39??DES\DES.dsw
?????文件???????50176??2017-09-10?16:00??DES\DES.ncb
?????文件???????48640??2017-09-10?16:00??DES\DES.opt
?????文件????????1264??2017-09-10?15:59??DES\DES.plg
?????目錄???????????0??2017-09-10?15:59??DES\Source\
?????文件?????????202??2012-09-07?11:24??DES\Source\bool.h
?????文件????????8557??2017-09-10?15:59??DES\Source\main.c
?????文件????????4458??2011-10-06?14:02??DES\Source\tables.h