title: Unable to encrypt special characters: not multiple of block length
body: <p>I have an encryption/decryption algorithm and I'm trying to encrypt some special characters to send to the server from android, but it is throwing an exception:</p>
  
  <blockquote>
    <p>java.lang.Exception: [encrypt] error:0607F08A:digital envelope routines:EVP_EncryptFinal_ex:data not multiple of block length</p>
  </blockquote>
  
  <p>Normal Latin characters are encrypted/decrypted fine, but special characters aren't. </p>
  
  <p>Here is my code:</p>
  
  <pre><code>public class MCrypt {
  
      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 MCrypt()
      {
          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" + Integer.toHexString(data[i]&amp;0xFF);
              else
                  str = str + 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 = 32;
          int x = source.length() % size;
          int padLength = size - x;
  
          for (int i = 0; i &lt; padLength; i++)
          {
              source += paddingChar;
          }
  
          return source;
      }
  }
  </code></pre>
  
  <p>Does anyone know what the problem here is? </p>
  
  <p>Thanks! </p>