package demoSys;

import java.security.SecureRandom;
import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class Test {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String input = "123456";
		String deskey = "QDHPJKOS";
		String encode = encrypt(input, deskey);
		System.out.println("DES加密结果：" + encode);
		String decode = decrypt(encode, deskey);
		System.out.println("DES解密结果：" + decode);
	}

	public static String encrypt(String souce, String key) {
		try {
			// DES算法要求有一个可信任的随机数源
			SecureRandom sr = new SecureRandom();
			// 从原始密匙数据创建DESKeySpec对象
			DESKeySpec dks = new DESKeySpec(key.getBytes("UTF-8"));
			// 创建一个密匙工厂，然后用它把DESKeySpec转换成 一个SecretKey对象
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			SecretKey secretkey = keyFactory.generateSecret(dks);
			// 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, secretkey, sr);
			// 获取数据并加密
			byte encryptedData[] = cipher.doFinal(souce.getBytes("UTF-8"));
			// JDK1.8及以上可直接使用Base64，JDK1.7及以下可以使用BASE64Encoder
			// Android平台可以使用android.util.Base64
			return new String(Base64.getEncoder().encode(encryptedData));
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			return souce;
		}

	}

	public static String decrypt(String souce, String key) {
		try {
			// DES算法要求有一个可信任的随机数源
			SecureRandom sr = new SecureRandom();
			// 从原始密匙数据创建DESKeySpec对象
			DESKeySpec dks = new DESKeySpec(key.getBytes());
			// 创建一个密匙工厂，然后用它把DESKeySpec转换成 一个SecretKey对象
			SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
			SecretKey secretkey = keyFactory.generateSecret(dks);
			// 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.DECRYPT_MODE, secretkey, sr);
			// 将加密报文用BASE64算法转化为字节数组
			byte[] encryptedData = Base64.getDecoder().decode(souce);
			// 用DES算法解密报文
			byte decryptedData[] = cipher.doFinal(encryptedData);
			return new String(decryptedData, "UTF-8");
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			return souce;
		}

	}

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace demo
{
    class Program
    {
        static void Main(string[] args)
        {
            string message = "123456";//要加密的字符串
            string key = "QDHPJKOS";  //算法密钥
            string encode = encrypt(message, key);
            Console.Write("DES加密结果：" + encode);
            string decode = decrypt(encode, key);
            Console.Write("\r\nDES解密结果：" + decode);
            Console.Read();
        }
        /// DES算法，加密
        /// param message  待加密字符串
        /// param key      解密私钥
        /// return         加密后的Base64编码字符串
        public static string encrypt(string message, string key)
        {
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(message);
                des.Key = UTF8Encoding.UTF8.GetBytes(key);
                des.IV = UTF8Encoding.UTF8.GetBytes(key);
                des.Mode = System.Security.Cryptography.CipherMode.ECB;
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Convert.ToBase64String(ms.ToArray());
                ms.Close();
                return str;
            }
        }
        /// DES算法，解密
        /// param message  待解密字符串
        /// param key      解密私钥
        /// return         解密后的字符串
        public static string decrypt(string message, string key)
        {
            byte[] inputByteArray = Convert.FromBase64String(message);
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                des.Key = UTF8Encoding.UTF8.GetBytes(key);
                des.IV = UTF8Encoding.UTF8.GetBytes(key);
                des.Mode = System.Security.Cryptography.CipherMode.ECB;
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            }
        }
    }
}