Simple Encrypt-Decrypt Algorithm

simpleED.js

var key = 'heuehueheubrbrbrprasswithlasers333';

/*
* Simple Encrypt-Decrypt Algorithm
* mode = 1 or -1 
* 1 -> Encrypt mode
* -1 -> Decrypt mode
*/

function simpleED( str, mode ){
	var j = 0, temp, parsed = '';
	for( var i = 0, count = str.length; i < count; i++ ){
		j++;
		temp = str[i].charCodeAt(0) + ( mode * key[j].charCodeAt(0) );

		if( key.length-1 === j ){ j = 1; }
		if( temp > 255 ){ temp -= 256 }
		
		parsed += String.fromCharCode(temp)	
	}

	return parsed;
}

// ...

simpleED('brazilianday', 1) // returns ÇçÆâÞÑÑÆãÆÓÛ;
simpleED('ÇçÆâÞÑÑÆãÆÓÛ', -1)// returns brazilian