README.md

Blowfish Algorithm

$key = 'MySecureKey'; $string = 'user_id|||EMAIL|||ETC';

function Encrypt($string, $key) {
	$dirty = array("+", "/", "=");
	$clean = array("_PLUS_", "_SLASH_", "_EQUALS_");
	$result = '';
	for($i=0; $i<strlen($string); $i++) {
		$char = substr($string, $i, 1);
		$keychar = substr($key, ($i % strlen($key))-1, 1);
		$char = chr(ord($char)+ord($keychar));
		$result.=$char;
	}		
	$encrypted_string = base64_encode($result);			
	$encrypted_string = str_replace($dirty, $clean, $encrypted_string);
	return urlencode($encrypted_string);
}

function Decrypt($string, $key) {
	$dirty = array("+", "/", "=");
	$clean = array("_PLUS_", "_SLASH_", "_EQUALS_");
	$result = '';
	$string = urldecode($string);
	$string = str_replace($clean, $dirty, $string);	
	$string = base64_decode($string);		
	for($i=0; $i<strlen($string); $i++) {
		$char = substr($string, $i, 1);
		$keychar = substr($key, ($i % strlen($key))-1, 1);
		$char = chr(ord($char)-ord($keychar));
		$result.=$char;
	}		
	return $result;
}