AESEncryptorEngine and Unicode characters

Hello

I use the AESEncryptorEngine and the AESDecryptorEngine to encrypt and decrypt the normal text strings that were entered by the user into an ActiveAutoTextEditField. The problem is: users who come in non English characters such as Japanese or Chinese may encrypt their messages, but after decryption the characters appear as garbage or they are sometimes a few points mark as '? It seems that line breaks back correctly.

My encryption and decryption methods work well for America Latin characters but not if it is complicated. Maybe someone knows what I'm missing here?

It's the method of encryption:

  public static String encrypt(String keyString, String plainText) {
    String encryptedText = null;

    byte[] keyData = keyString.getBytes();

    try {
      AESKey key = new AESKey( keyData );

      // Now, we want to encrypt the data.
      // First, create the encryptor engine that we use for the actual
      // encrypting of the data.
      AESEncryptorEngine engine = new AESEncryptorEngine( key );

      PKCS5FormatterEngine formatterEngine = new PKCS5FormatterEngine(engine);
      // Use the byte array output stream to catch the encrypted information.
      ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

      BlockEncryptor encryptor = new BlockEncryptor(formatterEngine, outputStream);

      // Encrypt the actual data.
      encryptor.write(plainText.getBytes());

      // Close the stream.
      encryptor.close();

      byte[] encryptedData = outputStream.toByteArray();

      encryptedText = new String(encryptedData);
    } catch (Exception e) {
      System.err.println(e.toString());
    }

    return encryptedText;
  }

It's the decryption method:

  public static String decrypt(String keyString, String encryptedText) {
    String plainText = null;

    byte[] keyData = keyString.getBytes();

    try {
      //remove prefix which indicates this is encrypted text
      encryptedText = encryptedText.substring(ENCRYPTION_PREFIX.length());

      AESKey key = new AESKey( keyData );

      // Now, create the decryptor engine.
      AESDecryptorEngine engine = new AESDecryptorEngine( key );

      // Create the unformatter engine that will remove any of the padding bytes.
      PKCS5UnformatterEngine unformatterEngine = new PKCS5UnformatterEngine(engine);

      // Set up an input stream to hand the encrypted data into the block decryptor.
      ByteArrayInputStream inputStream = new ByteArrayInputStream(encryptedText.getBytes());

      // Create the block decryptor passing in the unformatter engine and the encrypted data.
      BlockDecryptor decryptor = new BlockDecryptor(unformatterEngine, inputStream);

      byte[] temp = new byte[ 100 ];
      DataBuffer buffer = new DataBuffer();

      for( ;; ) {
          int bytesRead = decryptor.read( temp );
          buffer.write( temp, 0, bytesRead );

          if( bytesRead < 100 ) {
              // We ran out of data.
              break;
          }
      }

      inputStream.close();

      plainText = new String(buffer.getArray());

    } catch (Exception e) {
      System.err.println(e.toString());
    }

    return plainText;
  }

PS: I know that for loop in the decryption method is not really nice, but it was the only one that worked for me.

When you do your conversion rate of string/byte, specify an encoding...

plainText.getBytes("UTF-16");

raw text = new String (buffer.getArray (), "UTF-16");

Tags: BlackBerry Developers

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