#include?“StdAfx.h“
#include?“rc4.h“

rc4::rc4（unsigned?char?*key_data_ptrint?nLen）
{
	prepare_key（key_data_ptrnLen）;
}

void?rc4::prepare_key（unsigned?char?*key_data_ptr?int?key_data_len）
{
	unsigned?char?index1;
	unsigned?char?index2;
	unsigned?char*?state;
	short?counter;
	
	state?=?&key.state[0];
	
	for（counter?=?0;?counter?		state[counter]?=?（unsigned?char）counter;
	
	key.x?=?0;
	key.y?=?0;
	index1?=?0;
	index2?=?0;
	
	for（counter?=?0;?counter?	{
		index2?=?（key_data_ptr[index1]?+?state[counter]?+?index2）?%?256;
		swap_byte（&state[counter]?&state[index2]）;
		index1?=?（index1?+?1）?%?key_data_len;
	}
}

void?rc4::swap_byte（unsigned?char?*a?unsigned?char?*b）
{
	unsigned?char?x;
	x=*a;*a=*b;*b=x;
}

void?rc4::rc4_encode（unsigned?char?*buffer_ptr?int?buffer_len）
{
	unsigned?char?x;
	unsigned?char?y;
	unsigned?char*?state;
	unsigned?char?xorIndex;
	short?counter;
	
	x?=?key.x;
	y?=?key.y;
	state?=?&key.state[0];
	
	for（counter?=?0;?counter?	{
		x?=?（x?+?1）?%?256;
		y?=?（state[x]?+?y）?%?256;
		swap_byte（&state[x]?&state[y]）;
		xorIndex?=?（state[x]?+?state[y]）?%?256;
		buffer_ptr[counter]?^=?state[xorIndex];
	}
	key.x?=?x;
	key.y?=?y;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1280??2006-09-14?11:41??RC4_CPP\RC4_CPP\rc4.cpp

?????文件????????528??2006-09-14?11:41??RC4_CPP\RC4_CPP\rc4.h

?????文件???????2044??2006-09-13?16:46??RC4_CPP\RC4_CPP\RC4_CPP.cpp

?????文件???????4295??2006-09-13?17:54??RC4_CPP\RC4_CPP\RC4_CPP.dsp

?????文件???????1335??2006-09-13?16:46??RC4_CPP\RC4_CPP\RC4_CPP.h

?????文件???????5021??2006-09-13?17:46??RC4_CPP\RC4_CPP\RC4_CPP.rc

?????文件???????4336??2006-09-14?17:39??RC4_CPP\RC4_CPP\RC4_CPPDlg.cpp

?????文件???????1430??2006-09-13?17:13??RC4_CPP\RC4_CPP\RC4_CPPDlg.h

?????文件???????3597??2006-09-13?16:46??RC4_CPP\RC4_CPP\ReadMe.txt

?????文件???????1078??2006-09-13?16:46??RC4_CPP\RC4_CPP\res\RC4_CPP.ico

?????文件????????399??2006-09-13?16:46??RC4_CPP\RC4_CPP\res\RC4_CPP.rc2

?????文件????????823??2006-09-13?17:44??RC4_CPP\RC4_CPP\resource.h

?????文件????????209??2006-09-13?16:46??RC4_CPP\RC4_CPP\StdAfx.cpp

?????文件???????1024??2006-09-13?17:53??RC4_CPP\RC4_CPP\StdAfx.h

?????文件???10144768??2010-09-26?11:29??RC4_CPP\RC4_CPP\RC4_CPP.ncb

?????文件???????2560??2010-09-26?11:29??RC4_CPP\RC4_CPP\RC4_CPP.suo

?????目錄??????????0??2006-09-13?16:46??RC4_CPP\RC4_CPP\res

?????目錄??????????0??2006-09-14?17:39??RC4_CPP\RC4_CPP

?????目錄??????????0??2010-09-26?11:28??RC4_CPP

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

?????????????10174727????????????????????19