加密的操作类，包含判断是否加密

自己参照网上的加密解密，添加了一个判断是否加密函数

EDS操作：

using System;using System.Security.Cryptography;  using System.Text;namespace RuRo.Common.DEncrypt{/// <summary>/// DES加密/解密类。    /// Copyright (C) Maticsoft/// </summary>public class DESEncrypt{public DESEncrypt(){}#region ========加密========          /// <summary>        /// 加密        /// </summary>        /// <param name="Text"></param>        /// <returns></returns>public static string Encrypt(string Text) {            return Encrypt(Text, "RUROFREE");}/// <summary> /// 加密数据 /// </summary> /// <param name="Text"></param> /// <param name="sKey"></param> /// <returns></returns> public static string Encrypt(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 ========解密========             /// <summary>        /// 解密        /// </summary>        /// <param name="Text"></param>        /// <returns></returns>public static string Decrypt(string Text) {            return Decrypt(Text, "RUROFREE");}/// <summary> /// 解密数据 /// </summary> /// <param name="Text"></param> /// <param name="sKey"></param> /// <returns></returns> public static string Decrypt(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()); }        /// <summary>        /// 判断字符串是否加密过        /// </summary>        /// <param name="Text">要判断的字符</param>        /// <param name="sKey">加密编码</param>        /// <returns></returns>        public static string IsDesDecrypt(string Text, string sKey)         {            try            {               string streds= Decrypt(Text,sKey);               return streds;            }            catch             {                return "TMD";            }        } #endregion }}

base64操作：

using System;using System.Security.Cryptography;  using System.Text;namespace RuRo.Common.DEncrypt{public class DEncrypt{/// <summary>/// 构造方法/// </summary>public DEncrypt()  {  } #region 使用 缺省密钥字符串 加密/解密string/// <summary>/// 使用缺省密钥字符串加密string/// </summary>/// <param name="original">明文</param>/// <returns>密文</returns>public static string Encrypt(string original){return Encrypt(original,"MATICSOFT");}/// <summary>/// 使用缺省密钥字符串解密string/// </summary>/// <param name="original">密文</param>/// <returns>明文</returns>public static string Decrypt(string original){return Decrypt(original,"MATICSOFT",System.Text.Encoding.Default);}#endregion#region 使用 给定密钥字符串 加密/解密string/// <summary>/// 使用给定密钥字符串加密string/// </summary>/// <param name="original">原始文字</param>/// <param name="key">密钥</param>/// <param name="encoding">字符编码方案</param>/// <returns>密文</returns>public static string Encrypt(string original, string key)  {  byte[] buff = System.Text.Encoding.Default.GetBytes(original);  byte[] kb = System.Text.Encoding.Default.GetBytes(key);return Convert.ToBase64String(Encrypt(buff,kb));      }/// <summary>/// 使用给定密钥字符串解密string/// </summary>/// <param name="original">密文</param>/// <param name="key">密钥</param>/// <returns>明文</returns>public static string Decrypt(string original, string key){return Decrypt(original,key,System.Text.Encoding.Default);}/// <summary>/// 使用给定密钥字符串解密string,返回指定编码方式明文/// </summary>/// <param name="encrypted">密文</param>/// <param name="key">密钥</param>/// <param name="encoding">字符编码方案</param>/// <returns>明文</returns>public static string Decrypt(string encrypted, string key,Encoding encoding)  {       byte[] buff = Convert.FromBase64String(encrypted);  byte[] kb = System.Text.Encoding.Default.GetBytes(key);return encoding.GetString(Decrypt(buff,kb));      }  #endregion#region 使用 缺省密钥字符串 加密/解密/byte[]/// <summary>/// 使用缺省密钥字符串解密byte[]/// </summary>/// <param name="encrypted">密文</param>/// <param name="key">密钥</param>/// <returns>明文</returns>public static byte[] Decrypt(byte[] encrypted)  {  byte[] key = System.Text.Encoding.Default.GetBytes("MATICSOFT"); return Decrypt(encrypted,key);     }/// <summary>/// 使用缺省密钥字符串加密/// </summary>/// <param name="original">原始数据</param>/// <param name="key">密钥</param>/// <returns>密文</returns>public static byte[] Encrypt(byte[] original)  {  byte[] key = System.Text.Encoding.Default.GetBytes("MATICSOFT"); return Encrypt(original,key);     }  #endregion#region  使用 给定密钥 加密/解密/byte[]/// <summary>/// 生成MD5摘要/// </summary>/// <param name="original">数据源</param>/// <returns>摘要</returns>public static byte[] MakeMD5(byte[] original){MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();   byte[] keyhash = hashmd5.ComputeHash(original);       hashmd5 = null;  return keyhash;}/// <summary>/// 使用给定密钥加密/// </summary>/// <param name="original">明文</param>/// <param name="key">密钥</param>/// <returns>密文</returns>public static byte[] Encrypt(byte[] original, byte[] key)  {  TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();       des.Key =  MakeMD5(key);des.Mode = CipherMode.ECB;       return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length);     }  /// <summary>/// 使用给定密钥解密数据/// </summary>/// <param name="encrypted">密文</param>/// <param name="key">密钥</param>/// <returns>明文</returns>public static byte[] Decrypt(byte[] encrypted, byte[] key)  {  TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();  des.Key =  MakeMD5(key);    des.Mode = CipherMode.ECB;  return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length);}    #endregion        /// <summary>        /// 是否通过Base64加密验证        /// </summary>        /// <param name="input"></param>        /// <returns></returns>        public static bool IsBase64Formatted(string input)        {            try            {                Convert.FromBase64String(input);                return true;            }            catch            {                return false;            }        }}}

本人菜鸟，只是以一种简单的方式去判断是否存在这个文件，仅添加一个方法