title: javax.crypto.IllegalBlockSizeException: last block incomplete in decryption exception
body: <p>I am trying to decrypt a string in android. I keep getting the following exception:</p>
  
  <pre><code>08-21 03:56:56.700: W/System.err(4208): javax.crypto.IllegalBlockSizeException: last block incomplete in decryption
  08-21 03:56:56.700: W/System.err(4208):     at com.android.org.bouncycastle.jce.provider.JCEBlockCipher.engineDoFinal(JCEBlockCipher.java:697)
  08-21 03:56:56.700: W/System.err(4208):     at javax.crypto.Cipher.doFinal(Cipher.java:1106)
  08-21 03:56:56.700: W/System.err(4208):     at com.dharani.android.legalplex.BusinessLayer.BLCommonOperations.decrypt(BLCommonOperations.java:284)
  08-21 03:56:56.700: W/System.err(4208):     at com.dharani.android.legalplex.BusinessLayer.BLCommonOperations.decryptAndgetFailCountFromPreferences(BLCommonOperations.java:144)
  08-21 03:56:56.700: W/System.err(4208):     at com.dharani.android.legalplex.PresentationLayer.TransparentActivity.onCreate(TransparentActivity.java:112)
  08-21 03:56:56.700: W/System.err(4208):     at android.app.Activity.performCreate(Activity.java:4465)
  08-21 03:56:56.700: W/System.err(4208):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052)
  08-21 03:56:56.700: W/System.err(4208):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932)
  08-21 03:56:56.700: W/System.err(4208):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993)
  08-21 03:56:56.700: W/System.err(4208):     at android.app.ActivityThread.access$600(ActivityThread.java:127)
  08-21 03:56:56.700: W/System.err(4208):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159)
  08-21 03:56:56.700: W/System.err(4208):     at android.os.Handler.dispatchMessage(Handler.java:99)
  08-21 03:56:56.700: W/System.err(4208):     at android.os.Looper.loop(Looper.java:137)
  08-21 03:56:56.700: W/System.err(4208):     at android.app.ActivityThread.main(ActivityThread.java:4507)
  08-21 03:56:56.700: W/System.err(4208):     at java.lang.reflect.Method.invokeNative(Native Method)
  08-21 03:56:56.700: W/System.err(4208):     at java.lang.reflect.Method.invoke(Method.java:511)
  08-21 03:56:56.700: W/System.err(4208):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
  08-21 03:56:56.700: W/System.err(4208):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
  08-21 03:56:56.700: W/System.err(4208):     at dalvik.system.NativeStart.main(Native Method)
  </code></pre>
  
  <p>The encrypt and decrypt methods are:</p>
  
  <pre><code>public  String encrypt(String message) throws Exception
  {
      String salt = SharedVariables.globalContext.getString(R.string.EncryptionKey);
      SecretKeySpec key = new SecretKeySpec(salt.getBytes(), "AES");
      Cipher c = Cipher.getInstance("AES");
      c.init(Cipher.ENCRYPT_MODE, key);
      byte[] encVal = c.doFinal(message.getBytes());
      String encrypted=Base64.encodeToString(encVal, Base64.DEFAULT);
      return encrypted;
  }
  
  public  String decrypt(String message) throws Exception
  {
      String salt = SharedVariables.globalContext.getString(R.string.EncryptionKey);
      Cipher c = Cipher.getInstance("AES");
      SecretKeySpec key = new SecretKeySpec(salt.getBytes(), "AES");
      c.init(Cipher.DECRYPT_MODE, key);
      byte[] decordedValue = Base64.decode(message.getBytes(), Base64.DEFAULT);
      byte[] decValue = c.doFinal(decordedValue);
      String decryptedValue = new String(decValue);
      return decryptedValue;
  }
  </code></pre>