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# — micahwittman
– micahwittman, Commented Jun 24, 2010 at 21:14
I'm voting to close this question as off-topic because its asking for a translation — BradleyDotNET
– BradleyDotNET, Commented Dec 1, 2016 at 22:40

f13o · Accepted Answer · 2010-06-26 11:45:14Z

1

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";

edited Jun 26, 2010 at 11:45

answered Jun 24, 2010 at 21:45

f13o

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3 Comments

Johal Over a year ago

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 Over a year ago

<pre> 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); } } </pre> This doesnt give required result.

f13o Over a year ago

Does this help you? Accept if answer is ok.

Community · Accepted Answer · 2023-11-17 20:38:18Z

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.

edited Nov 17, 2023 at 20:38

CommunityBot

11 silver badge

answered Jun 24, 2010 at 21:14

svens

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