What is the equivalent of this encryption and decryption code in Scala?

Question

$KEY = "Your KEY";
$IV = "Your IV";

function addpadding($string, $blocksize = 32)
{
    $len = strlen($string);
    $pad = $blocksize - ($len % $blocksize);
    $string .= str_repeat(chr($pad), $pad);
    return $string;
}

function strippadding($string)
{
    $slast = ord(substr($string, -1));
    $slastc = chr($slast);
    $pcheck = substr($string, -$slast);
    if(preg_match("/$slastc{".$slast."}/", $string)){
        $string = substr($string, 0, strlen($string)-$slast);
        return $string;
    } else {
        return false;
    }
}

function encrypt($string = "")
{
    global $KEY,$IV;
    $key = base64_decode($KEY);
    $iv = base64_decode($IV);
    return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key,  addpadding($string), MCRYPT_MODE_CBC, $iv));
}

function decrypt($string = "")
{
    global $KEY,$IV;
    $key = base64_decode($KEY);
    $iv = base64_decode($IV);
    $string = base64_decode($string);
    return strippadding(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $string, MCRYPT_MODE_CBC, $iv));
}

EDIT

I'm looking for the exact implementation not just references to libraries so I posted the answer by myself. I'm coding in Scala but at first I asked for Java to increase the chance of getting an answer as quickly as possible, so the implementation is in Scala language.

There is no equivalent, because Sun JCE doesn't provide Rijndael-256. — Artjom B., Apr 17 '15 at 08:38
So how could I use their API? they can't change their implementation and they wrote they application with .NET and just have documentation for .NET and PHP! — Amir Karimi, Apr 17 '15 at 08:39
Implementation in [this question](http://stackoverflow.com/questions/15804895/rijndael-256-encryption-java-and-net-do-not-match) seems to be close to what you need. Uses the BouncyCastle Rijndael engine. — Robby Cornelissen, Apr 17 '15 at 08:42
possible duplicate of [How to encrypt or decrypt with Rijndael and a block-size of 256 bits?](http://stackoverflow.com/questions/8083144/how-to-encrypt-or-decrypt-with-rijndael-and-a-block-size-of-256-bits) — Artjom B., Apr 17 '15 at 08:44
Please don't close this question as it contains the direct answer which helps developers to get the implementation as fast as possible. — Amir Karimi, Apr 17 '15 at 14:05

score 1 · Answer 1 · answered Apr 17 '15 at 13:59

Thanks to the comments, here is the Scala implementation which works exactly the same as the above PHP code:

import org.apache.commons.codec.binary.Base64
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher
import org.bouncycastle.crypto.modes.CBCBlockCipher
import org.bouncycastle.crypto.engines.RijndaelEngine
import org.bouncycastle.crypto.paddings.PKCS7Padding
import org.bouncycastle.crypto.params._

class EncryptionUtil(keyBase64: String, ivBase64: String) {
  private val keyBytes = Base64.decodeBase64(keyBase64)
  private val ivBytes = Base64.decodeBase64(ivBase64)

  def encrypt(message: String): String = {
    val cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new RijndaelEngine(256)), new PKCS7Padding());
    val keySize = keyBytes.length;
    val ivAndKey = new ParametersWithIV(new KeyParameter(keyBytes, 0, keySize), ivBytes, 0, keySize);
    cipher.init(true, ivAndKey);
    val messageBytes = message.getBytes("UTF-8")
    val encrypted  = new Array[Byte](cipher.getOutputSize(messageBytes.length));
    val oLen = cipher.processBytes(messageBytes, 0, messageBytes.length, encrypted, 0);
    cipher.doFinal(encrypted, oLen);
    Base64.encodeBase64String(encrypted)
  }

  def decrypt(inputBase64: String): String = {
    val cipher = new PaddedBufferedBlockCipher(new CBCBlockCipher(new RijndaelEngine(256)), new PKCS7Padding());
    val keySize = keyBytes.length;
    val ivAndKey = new ParametersWithIV(new KeyParameter(keyBytes, 0, keySize), ivBytes, 0, keySize);
    cipher.init(false, ivAndKey);
    val messageBytes = Base64.decodeBase64(inputBase64)
    val decrypted  = new Array[Byte](cipher.getOutputSize(messageBytes.length));
    val oLen = cipher.processBytes(messageBytes, 0, messageBytes.length, decrypted, 0);
    cipher.doFinal(decrypted, oLen);

    val zeroTerminationIndex = decrypted.indexOf(0)
    new String(decrypted, 0, zeroTerminationIndex, "UTF-8")
  }
}

object EncryptionUtil {
  def apply(keyBase64: String, ivBase64: String) = new EncryptionUtil(keyBase64, ivBase64)
}

It uses bouncycastle which can be added to build.sbt:

libraryDependencies += "org.bouncycastle" % "bcprov-jdk15on" % "1.52"

What is the equivalent of this encryption and decryption code in Scala?

1 Answers1