各种加密方法集锦：

using System;using System.Security.Cryptography;using System.Text;using System.IO;using System.Configuration;namespace Blog.Common{    /// 
    /// 通用加密/解密类。    /// 
    public class Encrypt    {        #region ====对称加密(向量)=====        //SymmetricAlgorithm 所有对称算法的实现都必须从中继承的抽象基类        private SymmetricAlgorithm mobjCryptoService;        private string key;        public Encrypt()        {            mobjCryptoService = new RijndaelManaged();            key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";//自定义的密串        }        /// 
        /// 获得密钥        /// 
        /// 
     
      密钥
             private byte[] GetLegalKey()        {            string sTemp = key;            mobjCryptoService.GenerateKey();// 当在派生类中重写时，生成用于该算法的随机密钥            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);        }        /// 
        /// 获得初始向量IV        /// 
        /// 
     
      初试向量IV
             private byte[] GetLegalIV()        {            string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";            mobjCryptoService.GenerateIV();            byte[] bytTemp = mobjCryptoService.IV;// 获取或设置对称算法的初始化向量            int IVLength = bytTemp.Length;//获得一个 32 位整数，表示 System.Array 的所有维数中元素的总数            if (sTemp.Length > IVLength)                sTemp = sTemp.Substring(0, IVLength);            else if (sTemp.Length < IVLength)                sTemp = sTemp.PadRight(IVLength, ' ');            return ASCIIEncoding.ASCII.GetBytes(sTemp);        }        /// 
        /// 加密方法(请先实例化Encrypt类)        /// 
        /// 待加密的串        /// 
     
      经过加密的串
             public string EncrypStrByIV(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);        }        /// 
        /// 解密方法(请先实例化Encrypt类)        /// 
        /// 待解密的串        /// 
     
      经过解密的串
             public string DecrypStrByIV(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 ========DES加密========        /// 
        /// DES加密        /// 
        /// 待加密的字符串        /// 
     
      加密后的字符串
             public static string DESEncrypt(string Text)        {            return DESEncrypt(Text, "loveyajuan");        }        /// 
         /// DES加密数据         /// 
         /// 待加密的字符串         /// 加密密钥         /// 
     
      加密后的字符串
              public static string DESEncrypt(string Text, string sKey)        {            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            byte[] inputByteArray;            inputByteArray = Encoding.Default.GetBytes(Text);            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));            System.IO.MemoryStream ms = new System.IO.MemoryStream();            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);            cs.Write(inputByteArray, 0, inputByteArray.Length);            cs.FlushFinalBlock();            StringBuilder ret = new StringBuilder();            foreach (byte b in ms.ToArray())            {                ret.AppendFormat("{0:X2}", b);            }            return ret.ToString();        }        #endregion        #region ========DES解密========        /// 
        /// DES解密        /// 
        /// 待解密的字符串        /// 
     
      解密后的明文
             public static string DESDecrypt(string Text)        {            return DESDecrypt(Text, "loveyajuan");        }        /// 
         /// DES解密数据         /// 
         /// 待解密的字符串         /// 解密密钥         /// 
     
      解密后的明文
              public static string DESDecrypt(string Text, string sKey)        {            DESCryptoServiceProvider des = new DESCryptoServiceProvider();            int len;            len = Text.Length / 2;            byte[] inputByteArray = new byte[len];            int x, i;            for (x = 0; x < len; x++)            {                i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);                inputByteArray[x] = (byte)i;            }            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));            System.IO.MemoryStream ms = new System.IO.MemoryStream();            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);            cs.Write(inputByteArray, 0, inputByteArray.Length);            cs.FlushFinalBlock();            return Encoding.Default.GetString(ms.ToArray());        }        #endregion        #region ========MD5加密========        /// 
        /// MD5加密        /// 
        ///         /// 
             public static string MD5Encrypt(string paramstr)        {            string privateKey = "loveyajuan";            string tempStr = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(privateKey, "MD5");            return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(paramstr + tempStr, "MD5").ToLower();        }        #endregion        #region ====倒序加1加密解密====        /// 
        /// 倒序加1加密        /// 
        ///         /// 
             public static string EncryptOrderStr(string rs) //倒序加1加密         {            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;        }        /// 
        /// 顺序减1解码         /// 
        ///         /// 
             public static string DecryptOrderStr(string rs) //顺序减1解码         {            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        #region =====Escape加密解密====        /*statement：处理全角字符还是有问题的*/        /// 
        /// Escape加密        /// 
        ///         /// 
             public static string Escape(string str)        {            if (str == null)            {                return String.Empty;            }            StringBuilder sb = new StringBuilder();            int len = str.Length;            for (int i = 0; i < len; i++)            {                char c = str[i];                if (Char.IsLetterOrDigit(c) || c == '-' || c == '_' || c == '/' || c == '\\' || c == '.')                {                    sb.Append(c);                }                else                {                    sb.Append(Uri.HexEscape(c));                }            }            return sb.ToString();        }        /// 
        /// UnEscape解密        /// 
        ///         /// 
             public static string UnEscape(string str)        {            if (str == null)            {                return String.Empty;            }            StringBuilder sb = new StringBuilder();            int len = str.Length;            int i = 0;            while (i != len)            {                if (Uri.IsHexEncoding(str, i))                {                    sb.Append(Uri.HexUnescape(str, ref i));                }                else                {                    sb.Append(str[i++]);                }            }            return sb.ToString();        }        #endregion        #region ======Base64编解码=====        /// 
        /// Base64编码        /// 
        /// 编码类型        /// 待编码的字符串        /// 
             public static string Base64Encode(string code_type, string code)        {            string encode = "";            byte[] bytes = Encoding.GetEncoding(code_type).GetBytes(code);            try            {                encode = Convert.ToBase64String(bytes);            }            catch            {                encode = code;            }            return encode;        }        /// 
        /// Base64解码        /// 
        /// 编码类型        /// 带解码的字符串        /// 
             public static string Base64Decode(string code_type, string code)        {            string decode = "";            byte[] bytes = Convert.FromBase64String(code);            try            {                decode = Encoding.GetEncoding(code_type).GetString(bytes);            }            catch            {                decode = code;            }            return decode;        }        #endregion    }}