vStationURM/Tools/UploadClient/Cryptography.cs

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

namespace UploadClient
{
    public class Cryptography
    {
        #region 可逆加密
        /// <summary>
        /// 加密——秘钥必须8位
        /// </summary>
        /// <param name="data"></param>
        /// <param name="KEYStr"></param>
        /// <param name="IVStr"></param>
        /// <returns></returns>
        public static string Encode(string data, string KEYStr = "qnet9ew!", string IVStr = "56431212")
        {
            byte[] byKey = Encoding.ASCII.GetBytes(KEYStr);
            byte[] byIV = Encoding.ASCII.GetBytes(IVStr);

            using (DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider())
            {
                int i = cryptoProvider.KeySize;
                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write))
                    {
                        using (StreamWriter sw = new StreamWriter(cst))
                        {
                            sw.Write(data);
                            sw.Flush();
                            cst.FlushFinalBlock();
                            sw.Flush();
                            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 解密——秘钥必须8位
        /// </summary>
        /// <param name="data"></param>
        /// <param name="KEYStr"></param>
        /// <param name="IVStr"></param>
        /// <returns></returns>
        public static string Decode(string data, string KEYStr = "qnet9ew!", string IVStr = "56431212")
        {
            byte[] byKey = Encoding.ASCII.GetBytes(KEYStr);
            byte[] byIV = Encoding.ASCII.GetBytes(IVStr);

            byte[] byEnc;
            try
            {
                byEnc = Convert.FromBase64String(data);
            }
            catch
            {
                return null;
            }

            using (DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider())
            {
                using (MemoryStream ms = new MemoryStream(byEnc))
                {
                    using (CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read))
                    {
                        using (StreamReader sr = new StreamReader(cst))
                        {
                            return sr.ReadToEnd();
                        }
                    }
                }
            }
        }
        #endregion
    }
}