package fr.zng.xxzx.common.util;
import java.security.SecureRandom;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.SecretKeyFactory;
import javax.crypto.SecretKey;
import javax.crypto.Cipher;
/**
 DES加密介绍
      DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用相同密钥的算法。DES加密算法出自IBM的研究，
 后来被美国政府正式采用，之后开始广泛流传，但是近些年使用越来越少，因为DES使用56位密钥，以现代计算能力，
 24小时内即可被破解。虽然如此，在某些简单应用中，我们还是可以使用DES加密算法，本文简单讲解DES的JAVA实现
 。
 注意：DES加密和解密过程中，密钥长度都必须是8的倍数
 */
public class DesUtil {
    public DesUtil() {
    }
    //测试
    public static void main(String args[]) {
        //待加密内容
     String str = "1554107377000000";
     //密码，长度要是8的倍数
     String password = "2019000000000001";
     
     String result2 = encryptDES(str,password);
     System.out.println("加密后："+result2);
     
     String result3 = decryptDES(password, result2);
     System.out.println("解密后：："+result3);
 }
    /**
     * 加密
     * @param datasource byte[]
     * @param password String
     * @return byte[]
     */
    public static  byte[] encrypt(byte[] datasource, String password) {            
        try{
        SecureRandom random = new SecureRandom();
        DESKeySpec desKey = new DESKeySpec(password.getBytes());
        //创建一个密匙工厂，然后用它把DESKeySpec转换成
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey securekey = keyFactory.generateSecret(desKey);
        //Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance("DES");
        //用密匙初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
        //现在，获取数据并加密
        //正式执行加密操作
        return cipher.doFinal(datasource);
        }catch(Throwable e){
                e.printStackTrace();
        }
        return null;
}
    /**
     * 解密
     * @param src byte[]
     * @param password String
     * @return byte[]
     * @throws Exception
     */
    public static byte[] decrypt(byte[] src, String password) throws Exception {
            // DES算法要求有一个可信任的随机数源
            SecureRandom random = new SecureRandom();
            // 创建一个DESKeySpec对象
            DESKeySpec desKey = new DESKeySpec(password.getBytes());
            // 创建一个密匙工厂
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            // 将DESKeySpec对象转换成SecretKey对象
            SecretKey securekey = keyFactory.generateSecret(desKey);
            // Cipher对象实际完成解密操作
            Cipher cipher = Cipher.getInstance("DES");
            // 用密匙初始化Cipher对象
            cipher.init(Cipher.DECRYPT_MODE, securekey, random);
            // 真正开始解密操作
            return cipher.doFinal(src);
        }
    

	// 瀵瑰簲妗岄潰杞欢鐨刣es鍑芥暟
	public static String encryptDES(String datasource, String password) {
		byte[] datasource1 = DesToolUtil.hexString2Byteslong(datasource);
		byte[] password1 = DesToolUtil.hexString2Byteslong(password);
		try {
			SecureRandom random = new SecureRandom();

			DESKeySpec desKey = new DESKeySpec(password1);

			// 鍒涘缓锟??锟斤拷瀵嗗寵宸ュ巶锛岀劧鍚庣敤瀹冩妸DESKeySpec杞崲锟??
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			SecretKey securekey = keyFactory.generateSecret(desKey);
			// Cipher瀵硅薄瀹為檯瀹屾垚鍔犲瘑鎿嶄綔
			Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
			// Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
			// 鐢ㄥ瘑鍖欏垵濮嬪寲Cipher瀵硅薄
			cipher.init(Cipher.ENCRYPT_MODE, securekey);
			// 鐜板湪锛岃幏鍙栨暟鎹苟鍔犲瘑
			// 姝ｅ紡鎵ц鍔犲瘑鎿嶄綔
			return DesToolUtil.bytes2HexString(cipher.doFinal(datasource1));
		} catch (Throwable e) {
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 瑙ｅ瘑
	 * 
	 * @param src1
	 *            鏁版嵁
	 * @param password1
	 *            瀵嗛挜
	 * @return 鍘熸枃
	 */
	public static String decryptDES(String password1, String src1) {
		byte[] src = DesToolUtil.hexString2Byteslong(src1);
		byte[] password = DesToolUtil.hexString2Byteslong(password1);
		try {
			// DES绠楁硶瑕佹眰鏈変竴涓彲淇′换鐨勯殢鏈烘暟锟??
			SecureRandom random = new SecureRandom();
			// 鍒涘缓锟??锟斤拷DESKeySpec瀵硅薄
			DESKeySpec desKey = new DESKeySpec(password);
			// 鍒涘缓锟??锟斤拷瀵嗗寵宸ュ巶
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			// 灏咲ESKeySpec瀵硅薄杞崲鎴怱ecretKey瀵硅薄
			SecretKey securekey = keyFactory.generateSecret(desKey);
			// Cipher瀵硅薄瀹為檯瀹屾垚瑙ｅ瘑鎿嶄綔
			Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
			// Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
			// 鐢ㄥ瘑鍖欏垵濮嬪寲Cipher瀵硅薄
			cipher.init(Cipher.DECRYPT_MODE, securekey, random);
			// 鐪熸锟??锟斤拷瑙ｅ瘑鎿嶄綔
			return DesToolUtil.bytes2HexString(cipher.doFinal(src));
		} catch (Throwable e) {
			e.printStackTrace();
		}
		return null;
	}
}