/* ==================================================================   
 * Created [2009-4-27 下午11:32:55] by Jon.King 
 * ==================================================================  
 * TSS 
 * ================================================================== 
 * mailTo:jinpujun@hotmail.com
 * Copyright (c) Jon.King, 2009-2012 
 * ================================================================== 
 */

package com.jinhe.tss.core.util;

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.SecretKeySpec;

import com.jinhe.tss.core.exception.BusinessException;
import com.thoughtworks.xstream.core.util.Base64Encoder;

/**
 * 信息加/解密工具类 
 * 
 * @author Jon.King 2008-8-18
 */
public class InfoEncoder {

    private static String ALGORITHM = "Blowfish";

    private Cipher getCipher(int Cipher_MODE) {
        SecretKey deskey = new SecretKeySpec("jinhe-tss".getBytes(), ALGORITHM);
        try {
            Cipher cipher = Cipher.getInstance(ALGORITHM);
            cipher.init(Cipher_MODE, deskey);
            return cipher;
        } catch (NoSuchAlgorithmException e) {
            throw new BusinessException("没有此加/解密算法，加密器初始化失败", e);
        } catch (NoSuchPaddingException e) {
            throw new BusinessException("加/解密器初始化失败", e);
        } catch (InvalidKeyException e) {
            throw new BusinessException("非法的加/解密密匙，加密失败", e);
        }
    }

    /**
     * 将字符串加密
     * 
     * @param datasource
     *            要加密的数据
     * @return 返回加密后的 byte 数组
     * @throws Exception
     */
    public String createEncryptor(String datasource) {
        byte[] encryptorData;
        try {
            encryptorData = getCipher(Cipher.ENCRYPT_MODE).doFinal(datasource.getBytes());
        } catch (BadPaddingException ex) {
            throw new BusinessException("非法的加密数据，加密失败:" + datasource, ex);
        } catch (IllegalBlockSizeException ex) {
            throw new BusinessException("加密字符串字节数不对，加密失败:" + datasource, ex);
        }

        return new Base64Encoder().encode(encryptorData).replaceAll("\\s", "");
    }

    /**
     * <p>
     * 将字符串解密
     * </p>
     * 
     * @param datasource
     *            要解密的数据
     * @return 返回加密后的 byte[]
     */
    public String createDecryptor(String datasource) {
        byte[] decryptorData = new Base64Encoder().decode(datasource);

        byte[] createDecryptor;
        try {
            createDecryptor = getCipher(Cipher.DECRYPT_MODE).doFinal(decryptorData);
        } catch (BadPaddingException ex) {
            throw new BusinessException("非法的解密数据，解密失败:" + datasource, ex);
        } catch (IllegalBlockSizeException ex) {
            throw new BusinessException("解密字符串字节数不对，解密失败:" + datasource, ex);
        }
        return new String(createDecryptor);
    }

    
    private static final String MESSAGE_DIGEST_TYPE = "MD5";

    /**
     * 加密：MD5
     * 
     * @param str
     * @return
     */
    public static String string2MD5(String str) {
        try {
            MessageDigest alga = MessageDigest.getInstance(MESSAGE_DIGEST_TYPE);
            alga.update(str.getBytes());
            byte[] digesta = alga.digest();
            return byte2hex(digesta);
        } catch (NoSuchAlgorithmException ex) {
            return str;
        }
    }

    /**
     * 二行制转字符串
     * 
     * @param b
     * @return
     */
    private static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            stmp = (Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1)
                hs = hs + "0" + stmp;
            else
                hs = hs + stmp;
        }
        return hs.toUpperCase();
    }
}