ASP.NET----编解码的静态类实现数据的加密

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

namespace Core.Common.Tool
{
    /// <summary>
    /// 用于编解码的静态类
    /// </summary>
    public static class Code
    {
        #region 变量定义

        /// <summary>
        /// 对称算法基类
        /// </summary>
        private static SymmetricAlgorithm mobjCryptoService;
        /// <summary>
        /// 编码字符串
        /// </summary>
        private static string Key;

        #endregion

        #region 构造函数

        /// <summary>    
        /// 对称加密类的构造函数    
        /// </summary>    
        static Code()
        {
            mobjCryptoService = new RijndaelManaged();
            Key = "Guz(%&hj7x89H$yuCORE56FtmaT8&fvHCFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
        }

        #endregion

        #region 方法

        #region 对称加密

        /// <summary>    
        /// 获得密钥    
        /// </summary>    
        /// <returns>密钥</returns>    
        private static byte[] GetLegalKey()
        {
            string sTemp = Key;
            mobjCryptoService.GenerateKey();
            byte[] bytTemp = mobjCryptoService.Key;
            int KeyLength = bytTemp.Length;
            if (sTemp.Length > KeyLength)
                sTemp = sTemp.Substring(0, KeyLength);
            else if (sTemp.Length < KeyLength)
                sTemp = sTemp.PadRight(KeyLength, ' ');
            return ASCIIEncoding.ASCII.GetBytes(sTemp);
        }

        /// <summary>    
        /// 获得初始向量IV    
        /// </summary>    
        /// <returns>初试向量IV</returns>    
        private static byte[] GetLegalIV()
        {
            string sTemp = "E4ghj*Ghg7!rNIfb&95CORE6GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
            mobjCryptoService.GenerateIV();
            byte[] bytTemp = mobjCryptoService.IV;
            int IVLength = bytTemp.Length;
            if (sTemp.Length > IVLength)
                sTemp = sTemp.Substring(0, IVLength);
            else if (sTemp.Length < IVLength)
                sTemp = sTemp.PadRight(IVLength, ' ');
            return ASCIIEncoding.ASCII.GetBytes(sTemp);
        }

        /// <summary>    
        /// 加密方法    
        /// </summary>    
        /// <param name="Source">待加密的串</param>    
        /// <returns>经过加密的串</returns>    
        public static string EncryptCode(string Source)
        {
            byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
            MemoryStream ms = new MemoryStream();
            mobjCryptoService.Key = GetLegalKey();
            mobjCryptoService.IV = GetLegalIV();
            ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
            cs.Write(bytIn, 0, bytIn.Length);
            cs.FlushFinalBlock();
            ms.Close();
            byte[] bytOut = ms.ToArray();
            return Convert.ToBase64String(bytOut);
        }

        /// <summary>    
        /// 解密方法    
        /// </summary>    
        /// <param name="Source">待解密的串</param>    
        /// <returns>经过解密的串</returns>    
        public static string DecryptCode(string Source)
        {
            byte[] bytIn = Convert.FromBase64String(Source);
            MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
            mobjCryptoService.Key = GetLegalKey();
            mobjCryptoService.IV = GetLegalIV();
            ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
            StreamReader sr = new StreamReader(cs);
            return sr.ReadToEnd();
        }

        #endregion

        #region 简单字符串加密

        /// <summary>
        /// 倒序加1加密
        /// </summary>
        /// <param name="rs">明文</param>
        /// <returns>密文</returns>
        public static string EncryptStringSimple(string rs) 
        {
            byte[] by = new byte[rs.Length];
            for (int i = 0; i < rs.Length; i++)
            {
                by[i] = (byte)((byte)rs[i] + 1);
            }
            rs = "";
            for (int i = by.Length - 1; i >= 0; i--)
            {
                rs += ((char)by[i]).ToString();
            }
            return rs;
        }

        /// <summary>
        /// 顺序减1解码 
        /// </summary>
        /// <param name="rs">密文</param>
        /// <returns>明文</returns>
        public static string DecryptStringSimple(string rs)
        {
            byte[] by = new byte[rs.Length];
            for (int i = 0; i <= rs.Length - 1; i++)
            {
                by[i] = (byte)((byte)rs[i] - 1);
            }
            rs = "";
            for (int i = by.Length - 1; i >= 0; i--)
            {
                rs += ((char)by[i]).ToString();
            }
            return rs;
        }

        #endregion

        #endregion
    }
}