/*
 * CryptoKeyStore.java
 *
 *
 *
 ====================================================
 Professional Data Security (PDS)

 http://crypto.brettlee.com
 ====================================================

 Copyright (c) 2009-2011, Brett Lee
 All rights reserved.

 Portions Copyright (C) 1995-2008, Sun Microsystems, Inc.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

   * Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
   * Neither the name of the ORGANIZATION nor the names of its contributors
     may be used to endorse or promote products derived from this software
     without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.

 =============================================================================
*/



package com.brettlee.crypto;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.util.Enumeration;
import javax.swing.JFrame;
import javax.swing.JOptionPane;


class CryptoKeyStore {


	String newline = System.getProperty("line.separator");


	static KeyStore loadKeyStore(

				String ksFileName,
				char[] ksPass

		 	) throws	KeyStoreException, 
					IOException, 
					NoSuchAlgorithmException, 
					CertificateException  {


	//	System.out.println("Beginning CryptoKeyStore.loadKeyStore...");


		// Get extension of KeyStore (JKS, JCEKS)
		int dotPos = ksFileName.lastIndexOf(".");
		String extension = ksFileName.substring(dotPos + 1);
	//	System.out.println("KeyStore extension is: " + extension);


		// Creating empty KeyStore 
		final KeyStore ks = KeyStore.getInstance( extension );
	//	System.out.println("KeyStore has been set to type: " + ks.getType());


		// Read KeyStore from storage into new KeyStore
	//	System.out.println("KeyStore is: " + ksFileName);
	//	System.out.println("Loading KeyStore from storage ...");




		File ksFileIn = new File( ksFileName );

		if ( ksFileIn.exists() ) {

	//		System.out.println("File exists...");

			// don't buffer KeyStore; it's tiny anyway
			final FileInputStream input = new FileInputStream( ksFileIn );

			try {
				ks.load( input, ksPass );
			} finally {
				input.close();
			}

		} else {
			// notify if failure
			System.out.println("Error: KeyStore was not found!");
			JFrame frame = new JFrame();
			JOptionPane.showMessageDialog(
				frame,
				"Application error:: KeyStore was not found.",
				"KeyStore not found",
				JOptionPane.WARNING_MESSAGE);

			return null;
		}

		return ks;
	}




	// should be boolean return
	static boolean saveKeyStore (

					final KeyStore  keyStore,
					final char[]    ksPass,
					String		ksFileName


		 ) throws	KeyStoreException, 
				IOException, 
				NoSuchAlgorithmException, 
				CertificateException  {




		File ksFile = new File( ksFileName );

		final FileOutputStream out = new FileOutputStream(ksFile);

		boolean returnVal = true;

		try {
			keyStore.store( out, ksPass );

		} catch ( Exception e ) {
			System.out.println("Error writing KeyStore: " + e );
			returnVal = false;

		} finally {

			// Scrub the passwords
	//		System.out.println("Scrubbing passwords in CryptoKeyStore.saveKeyStore()...");
	//		for ( int i=0; i < ksPass.length; i++ ) { ksPass[i] = '0'; }
			out.close();
		}

		return returnVal;
	}





	// should be boolean return
	boolean createKeyStore (
				String ksType, 		// [0]: Type of KeyStore "Instance" (JKS, JCEKS) "ksType"
				char[] ksPass,		// [1]: Passphrase of KeyStore "ksPass"
				String ksFileName	// [2]: Filename of KeyStore "ksFile"

			) throws Exception {


		// Begin
	//	System.out.println(newline + "Beginning CryptoKeyStore.createKeyStore...");


		// Generate KeyStore
	//	System.out.println("Creating new KeyStore ...");
		KeyStore ks = KeyStore.getInstance( ksType );
		ks.load( (InputStream) null, ksPass);


		// Write KeyStore to disk
	//	System.out.println("Writing KeyStore to disk...");
		boolean returnVal = saveKeyStore( ks, ksPass, ksFileName );

		// Scrub the passwords
	//	System.out.println("Scrubbing passwords in CryptoKeyStore.createKeyStore()...");
	//	for ( int i=0; i < ksPass.length; i++ ) { ksPass[i] = '0'; }

		return returnVal;

	}






	String[][] getKeyStore (
					String keyStoreName,
					char[] ksPass

		 ) throws	KeyStoreException, 
				IOException, 
				NoSuchAlgorithmException, 
				CertificateException  {



	//	System.out.println("Starting CryptoKeyStore().getKeyStore() with: " + keyStoreName);

	//	System.out.println("KeyStore Name : " + keyStoreName);
	//	System.out.println("KeyStore Pass : " + ksPass);

	//	System.out.println("Loading KeyStore: " + keyStoreName);
		KeyStore ks = loadKeyStore ( keyStoreName, ksPass );

	//	System.out.println("KeyStore Type: " + ks.getType() );

		int keyCount = ks.size();
	//	System.out.println("Keys in KeyStore: " + keyCount);

	//	System.out.println("Getting Key Aliases and Creation Dates...");
		Enumeration<String> ksEnum = ks.aliases();
		String[][] ksElements = new String[keyCount][2];

		for (int count=0; ksEnum.hasMoreElements(); ++count ) {

			ksElements[count][1] = (String)ksEnum.nextElement();
			ksElements[count][0] = (String)ks.getCreationDate(ksElements[count][1]).toString();

	//		System.out.print("Created: " + ksElements[count][0] + "\t\t");
	//		System.out.println("Alias: " + ksElements[count][1]);
		}



		//
		// Want to sort the elements by date.  How 'bout an ArrayList ?
		//
	//	System.out.println("Sorting...");
	//	Arrays.sort(ksElements);
	//	System.out.println("Displaying again...");

	//	for (int count=0; count < ksElements.length; ++count ) {
	//		ksElements[count][0] = (String)ks.getCreationDate(ksElements[count][1]).toString();
	//		System.out.print("Alias: " + ksElements[count][1] + "\t\t" );
	//		System.out.println("Created: " +  ksElements[count][0]);
	//	}

		return ksElements;
	}
}