import  java.security.MessageDigest;
 import  java.security.NoSuchAlgorithmException;

 public   class  Crypto {

   public   static   void  main(String args[])
     throws  NoSuchAlgorithmException {
    String input = "test string";
    String output = MD5(input);
    System.out.println(input);
    System.out.println(output);
  }

   /**
    * Turns array of bytes into string representing each byte as
    * unsigned hex number.
    *
    * @param hash   Array of bytes to convert to hex-string
    * @return       Generated hex string
    */
   private   static  String ByteToHexString( byte  hash[]) {
    StringBuffer buf =  new  StringBuffer(hash.length *  2 );
     int  i;
     for  (i =  0 ; i < hash.length; i++) {
       if  ((hash[i] & 0xff) < 0x10)
      buf.append("0");
      buf.append( Long .toString(hash[i] & 0xff,  16 ));
    }
     return  buf.toString();
  }

   private   static  String digest(String input, String algorithm)  throws  NoSuchAlgorithmException {
    // Calculate Hash from input
    MessageDigest md = MessageDigest.getInstance(algorithm);
    // Convert byte array hash to string
     return  ByteToHexString(md.digest(input.getBytes()));
  }

  /**
    * Calculate RSA/MD5 hash from input string and return result as string
    *
    * @param  input  String to calculate hash
    * @return        Generated MD5 string
    */
   public   static  String MD5(String input)  throws  NoSuchAlgorithmException {
     return  digest(input, "MD5");
  }
}