#include?
#include?

void?InitS（unsigned?char?*s）
{
?int?i;
?for（i=0;i<256;i++）
??s[i]=i;
}

void?InitT（unsigned?char?*tchar?*key）
{
?int?i;
?for（i=0;i<256;i++）
??{
???t[i]=key[i%strlen（key）];
??}
}

void?Swap（unsigned?char?*sint?firstint?last）
{
?unsigned?char?temp;
?temp=s[first];
?s[first]=s[last];
?s[last]=temp;
}

void?InitPofS（unsigned?char?*sunsigned?char?*t）
{
?int?i;
?int?j=0;
?for（i=0;i<256;i++）
??{
???j=（j+s[i]+t[i]）%256;
???Swap（sij）;
??}
}


int?encypher（char?*sourcepathchar?*destpathchar?*key）
{
?unsigned?char?s[256]={0};
?unsigned?char?t[256]={0};
?char?buf;
?FILE?*fsource;
?FILE?*fdest;
?int?i=0;
?int?j=0;
?int?k=0;
?int?temp;

?InitS（s）;
?InitT（tkey）;
?InitPofS（st）;
?fsource=fopen（sourcepath“rb“）;
?fdest=fopen（destpath“wb“）;
?buf=fgetc（fsource）;
?while（buf!=EOF）
?{
??i=（i+1）%256;
??j=（j+s[i]）%256;
??Swap（sij）;
??temp=（s[i]+s[j]）%256;
??k=s[temp];
??fputc（k^buffdest）;
??buf=fgetc（fsource）;
?}
??fclose（fdest）;?
??fclose（fsource）;
?
?printf（“\n................................\nok\n“）;
?return?1;
}

int?main（int?argcchar?**argv）
{
????char?sourcepath[100]?destpath[100];
	int?i;
	char?key[256];

	while（1）
	{
		printf（“Please?choose?operation:\n1:?RC4\n2:?Encrypt\n3:?Decrypt\n4:?Exit\n“）;
		printf（“\nchoice:“）;
		scanf（“%d“&i）;
		if（i!=4?&&?i!=1）
		{
			printf（“File?Path:“）;
			scanf（“%s“&sourcepath）;

			printf（“Save?Path:“）;
			scanf（“%s“&destpath）;
			
			printf（“Input?Key:“）;
			scanf（“%s“&key）;
		}
		switch（i）
		{
		case?1:
			printf（“..............................RC4.................................\n“）;
			break;
		case?2:
			encypher（sourcepath?destpath?key）;
			break;
		case?3:
			encypher（sourcepath?destpath?key）;
			break;
		case?4:
		default:
			return;
		}
		printf（“\n“）;
	}

}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----

?????文件??????32768??2008-11-11?15:45??rc4\Debug\rc4.exe

?????文件?????319148??2008-11-11?15:45??rc4\Debug\rc4.ilk

?????文件?????396288??2008-11-11?15:45??rc4\Debug\rc4.pdb

?????文件??????11882??2008-11-11?15:45??rc4\rc4\Debug\BuildLog.htm

?????文件?????????67??2008-11-11?15:45??rc4\rc4\Debug\mt.dep

?????文件????????663??2008-11-11?15:45??rc4\rc4\Debug\rc4.exe.embed.manifest

?????文件????????728??2008-11-11?15:45??rc4\rc4\Debug\rc4.exe.embed.manifest.res

?????文件????????621??2008-11-11?15:45??rc4\rc4\Debug\rc4.exe.intermediate.manifest

?????文件??????13273??2008-11-11?15:45??rc4\rc4\Debug\rc4.obj

?????文件??????27648??2008-11-11?15:45??rc4\rc4\Debug\vc90.idb

?????文件??????53248??2008-11-11?15:45??rc4\rc4\Debug\vc90.pdb

?????文件???????1890??2008-11-10?19:20??rc4\rc4\rc4.c

?????文件???????3905??2008-11-10?14:11??rc4\rc4\rc4.vcproj

?????文件???????1427??2008-11-11?15:53??rc4\rc4\rc4.vcproj.CHINA-3B0AF26FA.Administrator.user

?????文件???????1427??2008-11-19?13:31??rc4\rc4\rc4.vcproj.CHINA-4820F37DB.Administrator.user

?????文件?????330752??2008-11-19?13:31??rc4\rc4.ncb

?????文件????????875??2008-11-10?14:10??rc4\rc4.sln

????..A..H.??????8704??2008-11-19?13:31??rc4\rc4.suo

?????目錄??????????0??2008-11-11?15:45??rc4\rc4\Debug

?????目錄??????????0??2008-11-11?15:45??rc4\Debug

?????目錄??????????0??2008-11-19?13:26??rc4\rc4

?????目錄??????????0??2008-11-19?13:00??rc4

-----------?---------??----------?-----??----

??????????????1205314????????????????????22