title: Cipher functions:EVP_DecryptFinal_ex:DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH
body: <p>Im trying to implement AES in an Android application. The server is a PHP server.</p>
  
  <p>This is the AES code :</p>
  
  <pre><code>public class AES{
  
  private String SecretKey = "89432hjfsd891787";
  private String iv = "fedcba9876543210";
  private IvParameterSpec ivspec;
  private SecretKeySpec keyspec;
  private Cipher cipher;
  
  public AES()
  {
      ivspec = new IvParameterSpec(iv.getBytes());
      keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
      try {
          cipher = Cipher.getInstance("AES/CBC/NoPadding");
      } catch (NoSuchAlgorithmException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      } catch (NoSuchPaddingException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
      }
  }
  
  public byte[] encrypt(String text) throws Exception
  {
      if(text == null || text.length() == 0)
          throw new Exception("Empty string");
  
      byte[] encrypted = null;
  
      try {
          cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
  
          encrypted = cipher.doFinal(padString(text).getBytes());
      } catch (Exception e)
      {
          throw new Exception("[encrypt] " + e.getMessage());
      }
  
      return encrypted;
  }
  
  public byte[] decrypt(String code) throws Exception
  {
      if(code == null || code.length() == 0)
          throw new Exception("Empty string");
  
      byte[] decrypted = null;
  
      try {
          cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
  
          decrypted = cipher.doFinal(hexToBytes(code));
      } catch (Exception e)
      {
          throw new Exception("[decrypt] " + e.getMessage());
      }
      return decrypted;
  }
  
  
  
  public static String bytesToHex(byte[] data)
  {
      if (data==null)
      {
          return null;
      }
      int len = data.length;
      String str = "";
      for (int i=0; i&lt;len; i++) {
          if ((data[i]&amp;0xFF)&lt;16)
              str = str + "0" + java.lang.Integer.toHexString(data[i]&amp;0xFF);
          else
              str = str + java.lang.Integer.toHexString(data[i]&amp;0xFF);
      }
      return str;
  }
  
  
  public static byte[] hexToBytes(String str) {
      if (str==null) {
          return null;
      } else if (str.length() &lt; 2) {
          return null;
      } else {
          int len = str.length() / 2;
          byte[] buffer = new byte[len];
          for (int i=0; i&lt;len; i++) {
              buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
          }
          return buffer;
      }
  }
  
  private static String padString(String source)
  {
      char paddingChar = ' ';
      int size = 16;
      int x = source.length() % size;
      int padLength = size - x;
      for (int i = 0; i &lt; padLength; i++) {
          source += paddingChar;
      }
      return source;
  }
  }
  </code></pre>
  
  <p>I get an error while decrypting the incoming string : Cipher functions:EVP_DecryptFinal_ex:DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH</p>
  
  <p>How do i go about this?</p>