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I'm trying to encrypt a string in Java on Android, and then decrypt it using PHP and/or node.js I've tried http://www.androidsnippets.com/encrypt-decrypt-between-android-and-php , but only the first half the returned hex string works. I want the encryption type of be AES with a 128 bit key (higher if possible). The encryption key will also need to be configurable, so my issue might be related to how I padded the strings. Java String.format("%1$-" + n + "s", s) PHP $key = str_pad($key,16); Full Java Code: package com.giggsey.test; import java.security.NoSuchAlgorithmException; import javax.crypto.Cipher; import javax.crypto.NoSuchPaddingException; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import android.util.Log; public class SimpleCrypto { private String iv = "fedcba9876543210";//Dummy iv (CHANGE IT!) private IvParameterSpec ivspec; private SecretKeySpec keyspec; private Cipher cipher; private String SecretKey = "0123456789abcdef";//Dummy secretKey (CHANGE IT!) public void doKey(String key) { ivspec = new IvParameterSpec(iv.getBytes()); key = padRight(key,16); Log.d("hi",key); keyspec = new SecretKeySpec(key.getBytes(), "AES"); try { cipher = Cipher.getInstance("AES/CBC/NoPadding"); } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block

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