Password Protect >>> Xor Encryption.


		<script 
		language="javascript"
		type="text/javascript">

		/* Visit http://www.yaldex.com/ 
		for full source code

		and get more free JavaScript, CSS and DHTML scripts! */

		<!-- Begin

		var 
		allowedChars =
		" 
		!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~??┌?└┘├┤€┴?▀?????▒▓⌠■∙√≈?™?⌡???? 
		???¤?¦§?©?«╜®?°±???µ╤·???»????????????????????????????????????????????????????????????????????";

		function 
		CharToDec(Character)
		{

		var 
		pos = 
		allowedChars.indexOf(Character.charAt(0));

		if(pos
		==
		-1)
		{

		window.status
		+= 
		Character;

		pos 
		=
		0;

		}

		return 
		pos;

		}

		function 
		DecToBin(Decimal)
		{

		var 
		i =
		0;

		var 
		Bin =
		"";

		while(Decimal
		>
		Math.pow(2, 
		i))
		{

		i++;

		}

		for
		(var 
		i = 
		i; 
		i >=
		0; 
		i--)
		{

		if
		(Decimal
		>=
		Math.pow(2, 
		i))
		{

		Decimal 
		-=
		Math.pow(2, 
		i);

		Bin 
		+=
		"1";

		} 
		else 
		Bin +=
		"0";

		}

		return 
		Bin;

		}

		function 
		ExclusiveOr(input1, 
		input2)
		{

		var 
		output =
		"";

		while(input1.length
		< 
		input2.length)
		{

		input1 
		=
		"0"
		+ 
		input1;

		}

		while(input1.length
		> 
		input2.length)
		{

		input2 
		=
		"0"
		+ 
		input2;

		}

		if
		(input1.length
		== 
		input2.length)
		{

		for
		(var 
		i=0; 
		i<input1.length; 
		i++)
		{

		output 
		+=
		(input1.charAt(i)
		!= 
		input2.charAt(i))
		?
		"1"
		:
		"0";

		}

		} 
		else
		alert("XOR 
		Operation Error.");

		return 
		output;

		}

		function 
		BinToDec(Binary)
		{

		var 
		Dec =
		0;

		for(var 
		i=0; 
		i<=Binary.length; 
		i++)
		{

		Dec 
		+=
		Math.pow(2,i)
		* 
		Binary.charAt((Binary.length
		-
		1)
		- 
		i);

		}

		return 
		Dec;

		}

		function 
		DecToChar(Decimal)
		{

		if
		(Decimal
		> 
		allowedChars.length)
		{

		Decimal 
		=
		0;

		}

		var 
		pos = 
		allowedChars.charAt(Decimal);

		return 
		pos;

		}

		function 
		BlockEncrypt(input1, 
		input2)
		{

		var 
		output =
		"";

		if
		(input1.length
		== 
		input2.length)
		{

		for
		(var 
		i =
		0; 
		i < 
		input1.length; 
		i++)
		{

		output 
		+= 
		DecToChar(BinToDec(ExclusiveOr(DecToBin(CharToDec(input1.charAt(i))), 
		DecToBin(CharToDec(input2.charAt(i))))));

		   
		}

		} 
		else
		alert("Block 
		Encryption Error.");

		return 
		output;

		}

		

		/*   Function:  Encrypts data.

		   Parameters:  2 parameters:  (text string, key)

		      Returns:  Encrypted string

		

		Decrypt the string by running function twice.

		*/

		function 
		EncryptString(plainText, 
		key)
		{

		var 
		cipherText =
		"";

		var 
		textBlock, 
		keyBlock =
		"";

		var 
		keyRotationPos =
		0;

		var 
		beforePos, 
		afterPos =
		0;

		var 
		blockSize =
		48;

		var 
		key = 
		hashKey(key);

		while(afterPos
		< 
		plainText.length)
		{

		beforePos 
		=
		0;

		afterPos 
		= 
		blockSize;

		if(afterPos
		< 
		plainText.length)
		{

		afterPos 
		= 
		plainText.length;

		}

		textBlock 
		= 
		plainText.substring(beforePos, 
		afterPos);

		keyBlock 
		= 
		key.substring(keyRotationPos, 
		key.length);

		while(keyBlock.length
		< 
		textBlock.length)
		{

		keyBlock 
		+= 
		key;

		}

		keyBlock 
		= 
		keyBlock.substring(0, 
		textBlock.length);

		keyRotationPos 
		= 
		keyBlock.length
		% 
		key.length;

		cipherText 
		+= 
		BlockEncrypt(textBlock, 
		keyBlock);

		beforePos 
		= 
		afterPos;

		afterPos 
		+= 
		blockSize;

		}

		return 
		cipherText;

		}

		function 
		hashKey(key)
		{

		var
		hash
		=
		"";

		for
		(var 
		i =
		0; 
		i < 
		key.length; 
		i++)
		{

		hash
		+= 
		DecToChar((CharToDec(key.charAt(i))
		+ 
		i)
		% 
		allowedChars.length);

		}

		return
		hash;

		}

		//  End -->

		</script>

		<center>

		<form
		name=box>

		<table
		cellpadding=0
		cellspacing=0
		border=0>

		<tr>

		<td 
		colspan=3>

		<textarea
		wrap=soft
		cols=40
		rows=5
		wrap=virtual
		name=ipt></textarea>

		</td>

		</tr>

		<tr 
		height=50>

		<td 
		align=center>

		<input
		type=button
		onclick="document.box.ipt.value=EncryptString(document.box.ipt.value,document.box.pwd.value);"
		value="Encrypt 
		/ Decrypt"><br>

		... using password:  
		<input 
		type=text
		name=pwd
		value="password">

		</td>

		</tr>

		</table>

		</form>

		</center>