/* 
	Masher.java

	Author:		Jon	Voiculescu
	Description:	
*/

//package Intro;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.security.*;
import sun.misc.*;

public class Masher extends Applet 
{
// variables and constants
	    byte[] buffer = new byte[8192];
		String input = new String();
		//MessageDigest md;
		String msgDigest = new String();





// BEGIN GENERATED CODE
	// member declarations
	java.awt.TextArea inputTextArea = new java.awt.TextArea();
// END GENERATED CODE
	
	boolean isStandalone = false;

	public Masher() 
	{
	
	}

	// Retrieve the value of an applet parameter
	public String getParameter(String key, String def) 
	{
		return isStandalone ? System.getProperty(key, def) :
			(getParameter(key) != null ? getParameter(key) : def);
	}

	// Get info on the applet parameters
	public String[][] getParameterInfo() 
	{
		return null;
	}

	// Get applet information
	public String getAppletInfo() 
	{
		return "Applet Information";
	}

	// Initialize the applet
	public void init() 
	{
		try {
			initComponents();

   		

		}
		catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void initComponents() throws Exception
	{
// BEGIN GENERATED CODE
		// the following code sets the frame's initial state
		inputTextArea.setText("Input your text here (You may copy and paste also)");
		inputTextArea.setLocation(new java.awt.Point(20, 20));
		inputTextArea.setVisible(true);
		inputTextArea.setSize(new java.awt.Dimension(360, 300));

		setLocation(new java.awt.Point(0, 0));
		setLayout(null);
		setSize(new java.awt.Dimension(400, 300));
		add(inputTextArea);

		inputTextArea.addTextListener(new java.awt.event.TextListener() {
			public void textValueChanged(java.awt.event.TextEvent e) {
				inputTextAreaTextValueChanged(e);
			}
		});
// END GENERATED CODE
	}
	
//-----------------------------------------------Original code from J.Knudsen ------------------
//                                                    Java Criptography
//----------------------------------------------------------------------------------------------
    // Calculate the digest for the given file.
    //FileInputStream in = new FileInputStream(args[0]);
    //byte[] buffer = new byte[8192];
    //int length;
    //while ((length = in.read(buffer)) != -1)
      //md.update(buffer, 0, length);
    //byte[] raw = md.digest();

    // Print out the digest in base64.
    //BASE64Encoder encoder = new BASE64Encoder();
    //String base64 = encoder.encode(raw);
    //System.out.println(base64);
//------------------------------------------------------------------------------------------------

	public void paint(Graphics g)
	{
	msgDigest = digest();
	

	g.drawString("Message Digest: "+msgDigest,10,360);
	//System.out.println(test);
	}//end paint

    public void inputTextAreaTextValueChanged(java.awt.event.TextEvent e)
    {
    	repaint();
    }
    
	String digest()
	{
	String base64 = new String();
	try{
	// Obtain a message digest object.
	MessageDigest md = MessageDigest.getInstance("MD5"); 
	
	input = inputTextArea.getText();
	int length = input.length();
	for (int i = 0; i<length+1; i = i+8192)
		{
		int upperLimit = i+8191;
		
		if (upperLimit>length) upperLimit = length; 
		String chunk = input.substring(i,upperLimit);
		buffer = chunk.getBytes();
		md.update(buffer);
		}//end for i
    byte[] raw = md.digest();

    // Compute the digest in base64.
    BASE64Encoder encoder = new BASE64Encoder();
    base64 = encoder.encode(raw);

		}
		catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
	return base64;
	}//end digest

	// Main entry point when running standalone
	public static void main(String[] args) 
	{
		Masher applet = new Masher();
		applet.isStandalone = true;
		Frame frame = new Frame();
		frame.setTitle("Applet Frame");
		frame.add( applet, BorderLayout.CENTER );
		applet.init();
		applet.start();
		frame.setSize( 400, 320 );
		Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
		frame.setLocation( (d.width - frame.getSize().width) / 2,
			(d.height - frame.getSize().height) / 2);
		frame.setVisible( true );
	}

}