public static String encrypt(String key, String plain) {
  Security.insertProviderAt(new org.bouncycastle.jce.provider.BouncyCastleProvider(), 3);
  byte[] plainText = plain.getBytes();
  String cipher = null;
 
  try {
    SecretKeySpec blowfishKey = new SecretKeySpec(key.getBytes(), "Blowfish");
    Cipher blowfishCipher = Cipher.getInstance("Blowfish", "BC");
    blowfishCipher.init(Cipher.ENCRYPT_MODE, (Key)blowfishKey);
    byte[] cipherText = blowfishCipher.doFinal(plainText);
    cipher = convertBinary2Hexadecimal(cipherText);
  } catch (Exception e) {
    e.printStackTrace();
  }
  return cipher;
}

String HEX_STRING  = "0123456789ABCDEF";
 
public static byte[] convertHexadecimal2Binary(byte[] hex) {
  int block = 0;
  byte[] data = new byte[hex.length / 2];
  int index = 0;
  boolean next = false;
 
  for (int i=0; i<hex.length; i++) {
    block <<= 4;
    int pos = HEX_STRING.indexOf(Character.toUpperCase((char) hex[i]));
    if (pos > -1) block += pos;
 
    if (next) {
      data[index] = (byte)(block & 0xff );
      index++;
      next = false;
    } else next = true;
  }
 
  return data;
}

String HEX_STRING  = "0123456789ABCDEF";
 
private static String convertBinary2Hexadecimal(byte[] binary) {
  byte[] data = new byte[binary.length * 2];
  StringBuffer buf = new StringBuffer();
  boolean second = false;
  int block = 0;
 
  for (int i=0; i<binary.length; i++) {
    block = binary[i] & 0xFF;
    buf.append(HEX_STRING.charAt(block >> 4));
    buf.append(HEX_STRING.charAt(binary[i] & 0x0F));
  }
 
  return buf.toString();
}