package com.test;
 
import it.sauronsoftware.base64.Base64;
 
import java.security.Key;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;
 
import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
 
public class Main
{
  public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";
  /**
   * DES算法，加密
   *
   * @param data 待加密字符串
   * @param key 加密私钥，长度不能够小于8位
   * @return 加密后的字节数组，一般结合Base64编码使用
   * @throws CryptException 异常
   */
  public static String encode(String key,String data) throws Exception
  {
    return encode(key, data.getBytes());
  }
  /**
   * DES算法，加密
   *
   * @param data 待加密字符串
   * @param key 加密私钥，长度不能够小于8位
   * @return 加密后的字节数组，一般结合Base64编码使用
   * @throws CryptException 异常
   */
  public static String encode(String key,byte[] data) throws Exception
  {
    try
    {
	  	DESKeySpec dks = new DESKeySpec(key.getBytes());
 
	  	SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
      //key的长度不能够小于8位字节
      Key secretKey = keyFactory.generateSecret(dks);
      Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
      IvParameterSpec iv = new IvParameterSpec(key.getBytes());
      AlgorithmParameterSpec paramSpec = iv;
      cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
 
      byte[] bytes = cipher.doFinal(data);
 
 
//      return byte2hex(bytes);
      return new String(Base64.encode(bytes));
    } catch (Exception e)
    {
      throw new Exception(e);
    }
  }
 
  /**
   * DES算法，解密
   *
   * @param data 待解密字符串
   * @param key 解密私钥，长度不能够小于8位
   * @return 解密后的字节数组
   * @throws Exception 异常
   */
  public static byte[] decode(String key,byte[] data) throws Exception
  {
    try
    {
    	SecureRandom sr = new SecureRandom();
	  	DESKeySpec dks = new DESKeySpec(key.getBytes());
	  	SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
      //key的长度不能够小于8位字节
      Key secretKey = keyFactory.generateSecret(dks);
      Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
      IvParameterSpec iv = new IvParameterSpec(key.getBytes());
      AlgorithmParameterSpec paramSpec = iv;
      cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec);
      return cipher.doFinal(data);
    } catch (Exception e)
    {
      throw new Exception(e);
    }
  }
 
  /**
   * 获取编码后的值
   * @param key
   * @param data
   * @return
   * @throws Exception
   */
  public static String decodeValue(String key,String data) 
  {
  	byte[] datas;
  	String value = null;
		try {
 
	  		datas = decode(key, Base64.decode(data.getBytes()));
 
			value = new String(datas);
		} catch (Exception e) {
			value = "";
		}
  	return value;
  }
 
  public static void main(String[] args) throws Exception
  {
  	System.out.println("明：abcd ；密：" + Main.encode("asdfwef5","abcd"));
  }
}