/TestLadder/src/main/java/com/ickik/ladder/utils/TestLadderEncoding.java

package com.ickik.ladder.utils;



import java.security.InvalidAlgorithmParameterException;

import java.security.InvalidKeyException;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;



import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.spec.IvParameterSpec;

import javax.crypto.spec.SecretKeySpec;



import com.ickik.ladder.exception.LadderException;



/**

 * Abstract class that contains encryption and decryption common methods.

 * @author Patrick Allgeyer (patrick.allgeyer@alcatel-lucent.com)

 * @version 0.1.000, 08/03/2010

 */

public final class TestLadderEncoding {



	private static final String ALGORITHM = "Blowfish";

	private static final String TRANSFORMATION = "Blowfish/CBC/PKCS5Padding";

	private static final byte[] iv = { (byte) 0xc9, (byte) 0x36, (byte) 0x78, (byte) 0x99,

			  (byte) 0x52, (byte) 0x3e, (byte) 0xea, (byte) 0xf2 };

	

	

	/**

	 * Encrypts the password given by argument with the login as key. This

	 * method is only used to encrypt the password for the .properties files

	 * stored in local.

	 * <br>The algorithm chooses is blowfish.

	 * @param login the login of the user used as key.

	 * @param password the password associates to the login.

	 * @return the password encrypted with blowfish algorithm.

	 * @throws LadderException this exception is thrown when an error occurs

	 * during the execution of this method. The problem could be that the

	 * algorithm was not found or the password or/and the key is/are null.

	 */

	public static final String encryptionPassword(String login, String password) throws LadderException {

		IvParameterSpec salt = new IvParameterSpec(iv);

		SecretKey skeySpec = new SecretKeySpec(login.getBytes(), ALGORITHM);

		try {

			Cipher c = Cipher.getInstance(TRANSFORMATION);

			c.init(Cipher.ENCRYPT_MODE, skeySpec, salt);

			byte[] buffer = c.doFinal(password.getBytes());

			return new String(buffer);

		} catch (NoSuchAlgorithmException e) {

			throw new LadderException("");

		} catch (NoSuchPaddingException e) {

			throw new LadderException("");

		} catch (InvalidKeyException e) {

			throw new LadderException("");

		} catch (InvalidAlgorithmParameterException e) {

			throw new LadderException("");

		} catch (IllegalBlockSizeException e) {

			throw new LadderException("");

		} catch (BadPaddingException e) {

			throw new LadderException("");

		}

	}



	/**

	 * Decrypts the password given by argument with the login as key. This

	 * method is only used to decrypt the password for the .properties files

	 * stored in local.

	 * <br>The algorithm chooses is blowfish.

	 * @param login the login of the user used as key.

	 * @param password the password associates to the login.

	 * @return the password decrypted with blowfish algorithm.

	 * @throws LadderException this exception is thrown when an error occurs

	 * during the execution of this method. The problem could be that the

	 * algorithm was not found or the password or/and the key is/are null.

	 */

	public static final String decryptionPassword(String login, String password) throws LadderException {

		IvParameterSpec salt = new IvParameterSpec(iv);

		SecretKey skeySpec = new SecretKeySpec(login.getBytes(), ALGORITHM);

		try {

			Cipher c = Cipher.getInstance(TRANSFORMATION);

			c.init(Cipher.DECRYPT_MODE, skeySpec, salt);

			byte[] buffer = c.doFinal(password.getBytes());

			return new String(buffer);

		} catch (NoSuchAlgorithmException e) {

			throw new LadderException("decryption.algorithm.invalid");

		} catch (NoSuchPaddingException e) {

			throw new LadderException("decryption.padding.invalid");

		} catch (InvalidKeyException e) {

			throw new LadderException("decryption.key.invalid");

		} catch (InvalidAlgorithmParameterException e) {

			throw new LadderException("decryption.algorithm.parameter.invalid");

		} catch (IllegalBlockSizeException e) {

			throw new LadderException("decryption.blocksize.illegal");

		} catch (BadPaddingException e) {

			e.printStackTrace();

			//throw new LadderException("decryption.padding.bad");

		}

		return password;

	}

	

	/**

	 * Encrypts the password with MD5 algorithm. This method is used

	 * the encrypt password to insert or check the users in database.

	 * @param password the password to encrypt with MD5 algorithm.

	 * @return the encrypted password under String format.

	 * @throws LadderException

	 */

	public static String encryptionPassword(String password) throws LadderException {

		byte[] uniqueKey = password.getBytes();

		StringBuilder hashString = new StringBuilder();

		try {

			byte[] hash = MessageDigest.getInstance("MD5").digest(uniqueKey);

			int len = hash.length;

			for (int i = 0; i < len; i++) {

				String hex = Integer.toHexString(hash[i]);

				if (hex.length() == 1) {

					hashString.append('0'); 

					hashString.append(hex.charAt(hex.length() - 1));

				} else {

					hashString.append(hex.substring(hex.length() - 2));

				}

			}

		} catch (NoSuchAlgorithmException e) {

			throw new LadderException("", e);

		}

		return hashString.toString();

	}



}