<?php
$sx_key = "95719d373a36051b273f39f2a1c4cedbd0cfeee354ece178ecf731a9771fe1fe";
$sx_iv = "b47c0457b2973ca931559e6fcf0cca66";

$msg = "Now is the time for all good men to come to the aide of their country";

//	ENCRYPT
$ss = f_encrypt($msg, $sx_key, $sx_iv);
echo "c_msg::".$ss."\n";

//	DECRYPT
$s = f_decrypt($ss, $sx_key, $sx_iv);
echo "msg::".$s."\n";


function f_encrypt($msg, $sx_key, $sx_iv)
{
	$cipher="AES-256-CBC";
	
	$key = Hex2String($sx_key);
	$iv = Hex2String($sx_iv);
	
	$ciphertext_raw = openssl_encrypt($msg, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
	
	return String2Hex($ciphertext_raw);
}


function f_decrypt($msg, $sx_key, $sx_iv)
{
	$cipher="AES-256-CBC";
	
	$key = Hex2String($sx_key);
	$iv = Hex2String($sx_iv);
	
	$ciphertext_raw = Hex2String($msg);		//	hex2bin
	//echo $ciphertext_raw."\n";
	
	$original_plaintext = openssl_decrypt($ciphertext_raw, $cipher, $key, $options=OPENSSL_RAW_DATA, $iv);
	
	return $original_plaintext;
}

//	http://www.jonasjohn.de/snippets/php/hex-string.htm
function String2Hex($string){
    $hex='';
    for ($i=0; $i < strlen($string); $i++){
        $hex .= dechex(ord($string[$i]));
    }
    return $hex;
}
function Hex2String($hex){
    $string='';
    for ($i=0; $i < strlen($hex)-1; $i+=2){
        $string .= chr(hexdec($hex[$i].$hex[$i+1]));
    }
    return $string;
}
?>

function String2Hex($string){
    $hex='';
    for ($i=0; $i < strlen($string); $i++){
        $hex .= zeropad(dechex(ord($string[$i])), 2);
    }
    return $hex;
}

function zeropad($num, $lim)
{
   return (strlen($num) >= $lim) ? $num : zeropad("0" .$num, $lim);
}