File: encrypt.lib.php

<?php

	function kPHPCrypt($strDataIn) {
		return StrRevCrypt(ROT13Crypt($strDataIn));
	}

	function ROT13Crypt($strDataIn) {
		
		//ABCDEFGHIJKLM
		//NOPQRSTUVWXYZ

		$newString = "";
		
		for ($i = 0; $i < strlen($strDataIn); $i++) {

			$temp = substr($strDataIn, $i, 1);
			$asc = ord($temp);

			$newChar = $temp;

			if (($asc >= 65) && ($asc <= 90)) {
				if ($asc <= 65 + 12) $newChar = chr($asc + 13);
				if ($asc >= 65 + 13) $newChar = chr($asc - 13);
			}
			
			if (($asc >= 97) && ($asc <= 122)) {
				if ($asc <= 97 + 12) $newChar = chr($asc + 13);
				if ($asc >= 97 + 13) $newChar = chr($asc - 13);
			}

			$newString = $newString . $newChar;			
			
		}

		return $newString;

	}


	function StrRevCrypt($strDataIn) {

		$newString = "";
		
		for ($i = strlen($strDataIn) - 1; $i >= 0; $i--) {
			$temp = substr($strDataIn, $i, 1);
			$newString = $newString . $temp;
		}

		return $newString;

	}

?>