/crypt.php

<?php
function hexit ($str) {
	return bin2hex($str);
}
function binit ($str){
	return pack("H*",$str);
	
}
/*
Hex to bin - bin to hex conversion example
===========================================
*/

#echo hexit('brown fox'); echo '</br> binit: '; echo binit('62726f776e20666f78'); echo '</br>';

#==========================================

function mysql_aes_encrypt($val,$ky) 
{ 
    $key="2c3fec85b5f6b0a1cd5a1010c67eb772"; 
    for($a=0;$a<strlen($ky);$a++) 
      $key[$a%16]=chr(ord($key[$a%16]) ^ ord($ky[$a])); 
    $mode=MCRYPT_MODE_ECB; 
    $enc=MCRYPT_RIJNDAEL_128; 
    $val=str_pad($val, (16*(floor(strlen($val) / 16)+(strlen($val) % 16==0?2:1))), chr(16-(strlen($val) % 16))); 
    $result = mcrypt_encrypt($enc, $key, $val, $mode, mcrypt_create_iv( mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM)); 
	return hexit($result);
} 


function mysql_aes_decrypt($val,$ky) 
{ 	
	$value = binit($val);
    $key="2c3fec85b5f6b0a1cd5a1010c67eb772"; 
    for($a=0;$a<strlen($ky);$a++) 
      $key[$a%16]=chr(ord($key[$a%16]) ^ ord($ky[$a])); 
    $mode = MCRYPT_MODE_ECB; 
    $enc = MCRYPT_RIJNDAEL_128; 
    $dec = @mcrypt_decrypt($enc, $key, $value, $mode, @mcrypt_create_iv( @mcrypt_get_iv_size($enc, $mode), MCRYPT_DEV_URANDOM ) ); 
    return rtrim($dec,(( ord(substr($dec,strlen($dec)-1,1))>=0 and ord(substr($dec, strlen($dec)-1,1))<=16)? chr(ord( substr($dec,strlen($dec)-1,1))):null)); 
} 
$key = $_POST['key'];
$crypt = $_POST['tocrypt'];


$encrypted =  mysql_aes_encrypt ($crypt,$key);

echo $encrypted; 

if($_POST['todecrypt']!==''){
	$decrypt = $_POST['todecrypt']; $decrypted = 'x-.-x'.mysql_aes_decrypt($decrypt,$key);
	 echo $decrypted; }
else {echo 'x-.-xDecrypted text will appear here.';}

?>