[Utility.sln]根据MSDN上的DESCryptoServiceProvider 类 尝试写的对称密钥加密原代码[可应用于安全级别不高的数据连接和密码保护]

自己份源程序.^^

using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Security.Cryptography;
using System.IO;

namespace Utility
{
    /**//// <summary>
    /// The DSAPI wrapper
    /// 安全加密算法用于日后扩展
    /// To be released as part of the Microsoft Configuration Building Block
    /// </summary>
    public class DataProtector 
    {
        //private SymmetricAlgorithm mCSP;
        /**//// <summary>
        /// 创建一个对称加密算法的基类
        /// </summary>
        private System.Security.Cryptography.SymmetricAlgorithm mCSP;
        /**//// <summary>
        /// keyOne
        /// </summary>
        private string _KeyGen ="qA3cLz8Y9Xw=";
        /**//// <summary>
        /// keyTwo
        /// </summary>
        private string _IVGen ="uHnaoO/MEDw=";

        /**//// <summary>
        /// 生成要用于此算法的随机初始化向量,返回string
        /// </summary>
        /// <returns></returns>
        public string GenerateKeyGen()
        {
            mCSP = SetEnc();

            mCSP.GenerateKey();

            return Convert.ToBase64String(mCSP.Key);
        }

        /**//// <summary>
        /// 生成用于此算法的随机 Key,返回string
        /// </summary>
        /// <returns></returns>
        public string GenerateIVGen()
        {
            mCSP.GenerateIV();

            return Convert.ToBase64String(mCSP.IV);
        }


        /**//// <summary>
        /// 加密算法选择,本程序默认选择DESCryptoServiceProvider进行加密
        /// </summary>
        /// <returns></returns>
        private SymmetricAlgorithm SetEnc()
        {
            return new DESCryptoServiceProvider();
            //            return new DESCryptoServiceProvider();
            //            return new TripleDESCryptoServiceProvider();
        }


        /**//// <summary>
        /// 加密(通过本类的_KeyGen,_IVGen进行对称密钥)
        /// </summary>
        /// <param name="Value"></param>
        /// <returns></returns>
        public string EncryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            mCSP.Key=Convert.FromBase64String(this._KeyGen);
            mCSP.IV=Convert.FromBase64String(this._IVGen);
            ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);

            //ct=mCSP.CreateEncryptor();
            byt = Encoding.UTF8.GetBytes(Value);

            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();
    
            cs.Close();

            return Convert.ToBase64String(ms.ToArray());
        }

        /**//// <summary>
        /// 解密
        /// </summary>
        /// <param name="Value"></param>
        /// <returns></returns>
        public string DecryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            mCSP.Key=Convert.FromBase64String(this._KeyGen);
            mCSP.IV=Convert.FromBase64String(this._IVGen);
            ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);

            byt = Convert.FromBase64String(Value);

            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();

            cs.Close();

            return Encoding.UTF8.GetString(ms.ToArray());
        }
    }
}