AES Encrypt/Decrypt

[backer]

Hi, I'm not a PHP developer and has some problems with a script that I'm trying to do with AES.

Have taking lines from different places and came up with this (look on code).

 

The problem when decrypt back I get some strange characters in the end that looks like this; ����

...please help this noob 

 

<?php

$text = "The quick brown fox jumped over the lazy dog";
$key = "12345678901234561234567890123456";
$iv = "1234567890123456";
echo "Orginal values";
echo "</br>Text: " . $text;
echo "</br>Key: " . $key;
echo "</br>IV: " . $iv;

echo "</br></br>";
$feedback = encrypt($text, $key, $iv);
echo "</br></br>";
$feedback = decrypt($feedback["result"], $feedback["key"], $feedback["iv"]);
echo "</br></br>";

// Values from another system (not php)
// String is the same; The quick brown fox jumped over the lazy dog.
$text = "4d3b2ca3ee35b3e58270c4270b909384d57670ba7e3e57d0798e4c5a15267bc3d4547154c4f4abaf1c325e89f34e7100";
$key = "3132333435363738393031323334353631323334353637383930313233343536";
$iv = "3a16ff9192289f9546afb2aebb8d122a";
echo "Other Sevice values";
$feedback = decrypt($text, $key, $iv);





function encrypt($text,$key,$iv)
{
	$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
	$iv_size = mcrypt_enc_get_iv_size($cipher);
	$key256 = $key;//'12345678901234561234567890123456';
	$iv = $iv;//'1234567890123456'; // 16bits

	// This is the plain-text to be encrypted:
	$cleartext = $text;

	// Let's do 256-bit encryption here:
	if (mcrypt_generic_init($cipher, $key256, $iv) != -1)
	{
		// PHP pads with NULL bytes if $cleartext is not a multiple of the block size..
		$cipherText = mcrypt_generic($cipher,$cleartext );
		mcrypt_generic_deinit($cipher);

		// Display the result in hex;
		echo "</br>Encrypt; " . $cleartext;
		echo "</br>   Encrypted (hex): ".bin2hex($cipherText);
		echo "</br>   Key (hex): ".bin2hex($key256);
		echo "</br>   IV (hex): ".bin2hex($iv);

		/*
		 * 	Example result
		 * Encrypt; The quick brown fox jumped over the lazy dog
		 * Encrypted (hex): 2fddc3abec692e1572d9b7d629172a05caf230bc7c8fd2d26ccfd65f9c54526984f7cb1c4326ef058cd7bee3967299e3
		 * Key (hex): 3132333435363738393031323334353631323334353637383930313233343536
		 * IV (hex): 31323334353637383930313233343536
		 */
		return array("result"=>bin2hex($cipherText), "key"=>bin2hex($key256), "iv"=>bin2hex($iv));
	}
}

function decrypt($encyption, $key, $iv)
{
	$cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
	$iv_size = mcrypt_enc_get_iv_size($cipher);

	$key256 = hex2bin($key);
	$iv = hex2bin($iv);
	$cleartext = hex2bin($encyption);

	// Let's do 256-bit decryption here:
	if (mcrypt_generic_init($cipher, $key256, $iv) != -1)
	{
		// PHP pads with NULL bytes if $cleartext is not a multiple of the block size..
		$cipherText = mdecrypt_generic($cipher,$cleartext );
		mcrypt_generic_deinit($cipher);

		// Display the result
		echo "</br>Decrypt; " . $cleartext;
		echo "</br>   result: ".$cipherText;
		echo "</br>   Key: ".($key256);
		echo "</br>   IV: ".($iv);

		/*
		 * 	Example result
		 * Decrypt; The quick brown fox jumped over the lazy dog����
		 * Decrypt (string): 2fddc3abec692e1572d9b7d629172a05caf230bc7c8fd2d26ccfd65f9c54526984f7cb1c4326ef058cd7bee3967299e3
		 * Key (string): 12345678901234561234567890123456
		 * IV (string): 1234567890123456
		 */
	}
}

function hex2bin($h)
{
	if (!is_string($h)) return null;
	$r='';
	for ($a=0; $a<strlen($h); $a+=2) { $r.=chr(hexdec($h{$a}.$h{($a+1)})); }
	return $r;
}
  
?>

[backer]

Anyone, help!! 

[haku]

Check the data before it's encrypted (echo it to the screen), to confirm where the problem is. Usually those marks are due to charsetproblems.

[backer]

Possible to force strings or php page to be utf-8 somehow?

[Mchl]

Yes. Make sure your html page is declared as utf-8. Save your PHP source as UTF-8 without BOM. Use mbstring functions for operations on UTF-8 strings.

[backer]

Really need some help here, =(

 

tried putting this at top

<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />

 

page sez it's utf-8, but when I'm trying this out it still says that my text is ASCII.

$text =  utf8_encode("The quick brown fox jumped over the lazy dog");

echo "type; ".mb_detect_encoding($text);

[backer]

Found the problem, the string convertion problem, ASCII characters didn't cut of \0 characters. Do a trim on it.