using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Management;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace Uninpho.Tools
{
    public class sqClass
    {
        /// <summary>
        /// DES数据加密
        /// </summary>
        /// <param name="targetValue">目标值</param>
        /// <param name="key">密钥</param>
        /// <returns>加密值</returns>
        public static string Encrypt(string targetValue, string key)
        {
            //实例化加密类对象
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            //定义字节数组用来存放密钥 GetBytes方法用于将字符串中所有字节编码为一个字节序列
            byte[] arr_key = Encoding.UTF8.GetBytes(key.Substring(0, 8));
            //!!!DES加密key位数只能是64位，即8字节
            //注意这里用的编码用当前默认编码方式，不确定就用Default
            byte[] arr_str = Encoding.UTF8.GetBytes(targetValue);//定义字节数组存放要加密的字符串
            MemoryStream ms = new MemoryStream();//实例化内存流对象
            //创建加密流对象，参数 内存流/初始化向量IV/加密流模式
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(arr_key, arr_key), CryptoStreamMode.Write);
            //需加密字节数组/offset/length，此方法将length个字节从 arr_str 复制到当前流。0是偏移量offset，即从指定index开始复制。
            cs.Write(arr_str, 0, arr_str.Length);
            cs.Close();
            string str_des = Convert.ToBase64String(ms.ToArray());
            return str_des;
        }
        /// <summary>
        /// DES数据解密
        /// </summary>
        /// <param name="targetValue"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string Decrypt(string targetValue, string key)
        {
            //定义字节数组用来存放密钥 GetBytes方法用于将字符串中所有字节编码为一个字节序列
            byte[] arr_key = Encoding.UTF8.GetBytes(key.Substring(0, 8));
            MemoryStream ms = new MemoryStream();
            //注意这里仍要将密文作为base64字符串处理获得数组，否则报错
            byte[] arr_des = Convert.FromBase64String(targetValue);
            //解密方法定义加密对象
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(arr_key, arr_key), CryptoStreamMode.Write);
            cs.Write(arr_des, 0, arr_des.Length);
            cs.FlushFinalBlock();
            cs.Close();
            return Encoding.UTF8.GetString(ms.ToArray());
        }

        /// <summary>
        /// 获取CPU序列号
        /// </summary>
        /// <returns></returns>
        public static string GetCpuID()
        {
            try
            {
                //获取CPU序列号代码 
                string cpuInfo = "";//cpu序列号 
                ManagementClass mc = new ManagementClass("Win32_Processor");
                ManagementObjectCollection moc = mc.GetInstances();
                foreach (ManagementObject mo in moc)
                {
                    cpuInfo = mo.Properties["ProcessorId"].Value.ToString();
                }
                moc = null;
                mc = null;
                return cpuInfo;
            }
            catch
            {
                return "unknow";
            }
            finally
            {
            }

        }
    }
}