Convert C# code to PHP

Question

private static readonly byte[] IV = new byte[8] { 240, 3, 45, 29, 0, 76, 173, 59 };

public  string Decrypt(string encryptedData,string key)
{
    encryptedData = HttpUtility.UrlDecode(encryptedData);
    byte[] buf = Convert.FromBase64String(encryptedData);
    TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
    MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
    des.Key = MD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key));
    des.IV = IV;
    return Encoding.ASCII.GetString(
        des.CreateDecryptor().TransformFinalBlock(
            buf,
            0,
            buf.Length
            )
        );
    }
}

Is there any way to convert above .Net code to PHP so that i can decrypt data in PHP that's sent from .Net code?

This SO post may help: [tripledes encryption not yielding same results in PHP and C#](http://stackoverflow.com/questions/2467419/tripledes-encryption-not-yielding-same-results-in-php-and-c) — micahwittman, Jun 24 '10 at 21:14
I'm voting to close this question as off-topic because its asking for a translation — BradleyDotNET, Dec 01 '16 at 22:40

score 1 · Answer 1 · answered Jun 24 '10 at 21:14

1

You'll find all functionality you need for this within the PHP mcrypt extension. Look here for the full function list and here for an example on how to use it.

answered Jun 24 '10 at 21:14

svens

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f13o · Accepted Answer · 2010-06-26T11:45:14.200

I am no encryption expert, but this should be working example...

# original C# code

#  private static readonly byte[] IV = new byte[8] { 240, 3, 45, 29, 0, 76, 173, 59 };  
#        public  string Decrypt(string encryptedData,string key)
#        {
#                encryptedData = HttpUtility.UrlDecode(encryptedData);
#                byte[] buf = Convert.FromBase64String(encryptedData);
#                TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
#                MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
#                des.Key = MD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key));
#                des.IV = IV;
#                return Encoding.ASCII.GetString(
#                    des.CreateDecryptor().TransformFinalBlock(
#                    buf,
#                    0,
#                    buf.Length
#                    )
#                    );

#        }

#    }

// packs array into bytestring
function pack_array($a) {
    $out = null;
    foreach ($a as $i) { $out .= chr(ord(substr($i,0,1))); }
    var_dump(($out));
    return $out;
}

class Sample {
    public static $IV = array( 240, 3, 45, 29, 0, 76, 173, 59 );
    public static $key = 's3cr3tk3yl0ng1n4ph';

    // 3des encryption
    public static function Encrypt($data) {
        $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');

        $ks = mcrypt_enc_get_key_size($td);

        // create key
        $key = substr(md5(self::$key), 0, $ks);
        // pack IV
        $IVPacked = pack_array(self::$IV);
        mcrypt_generic_init($td, $key, $IVPacked);
        $encryptedData = mcrypt_generic($td, $data);
        mcrypt_generic_deinit($td);

        $encryptedData = base64_encode($encryptedData);
        $encryptedData = urlencode($encryptedData);
        return $encryptedData;
    }


        // 3des decryption
    public static function Decrypt($encryptedData, $key) {
        $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');

        $encryptedData = urldecode($encryptedData);
        $encryptedData = base64_decode($encryptedData);

        $key = substr(md5($key), 0, mcrypt_enc_get_key_size($td));
        $IVPacked = pack_array(self::$IV);
        mcrypt_generic_init($td, $key, $IVPacked);
        $decryptedData =  mdecrypt_generic($td, $encryptedData);
        mcrypt_generic_deinit($td);

        return $decryptedData;
    }
}

// __main__
$data = "methodname=GetClientшђшђ";   

var_dump($data);
//var_dump(unpack_str($data, strlen($data)));
$encryptedData = Sample::Encrypt($data);

//var_dump(bin2hex(Sample::$IV));
var_dump (bin2hex($encryptedData));

$decryptedData = Sample::Decrypt($encryptedData, Sample::$key);
var_dump($decryptedData);
echo "\n";

I tried using your function. When i try to run it gives me following warning and do nothing. I do not have experience with mcrypt. Warning: mcrypt_generic_init() expects parameter 3 to be string, array given in C:\xampplite\htdocs\dotnet.php on line 10 Warning: mdecrypt_generic() [function.mdecrypt-generic]: Operation disallowed prior to mcrypt_generic_init(). in C:\xampplite\htdocs\dotnet.php on line 11 I want to decrtpy following from .Net: $encryptedData ="7RuuCInGDUcdsEKsMimFYk8aqq3pd9tK" $key = "FakeKey" $iv = new byte[8] { 240, 3, 45, 29, 0, 76, 173, 59 } — Johal, Jun 25 '10 at 13:54
class Sample { private static $IV = array( 240, 3, 45, 29, 0, 76, 173, 59 ); public function Decrypt($encryptedData, $key) { $IV = self::$IV; $iv_string = ""; foreach(array_values($IV) as $chr) { $iv_string .= chr($chr); } $encryptedData = urldecode($encryptedData); $buf = base64_decode($encryptedData); $key = md5($key); $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, ''); mcrypt_generic_init($td, $key, $iv_string); return mdecrypt_generic($td, $encryptedData); } } This doesnt give required result. — Johal, Jun 25 '10 at 16:14

Convert C# code to PHP

2 Answers2