Des与3Des加密解密

    /// <summary>/// Des和3Des算法/// </summary>public class Des{/// <summary>/// Des加密/// </summary>/// <param name="pToEncrypt">明文</param>/// <param name="sKey">密钥</param>/// <returns></returns>public static string DESEnCode(string pToEncrypt, string sKey){pToEncrypt = HttpContext.Current.Server.UrlEncode(pToEncrypt);DESCryptoServiceProvider des = new DESCryptoServiceProvider();byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(pToEncrypt);des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);MemoryStream ms = new 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);}ret.ToString();return ret.ToString();}/// <summary>/// 3Des加密(密钥不能每8位重复，例如：123456781234567812345678，如果这样则算法退化为Des，C#会检测，不能使用)/// </summary>/// <param name="a_strString">明文</param>/// <param name="a_strKey">密钥</param>/// <returns></returns>public string Decrypt3DES(string a_strString, string a_strKey){TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();DES.Key = ASCIIEncoding.ASCII.GetBytes(a_strKey);DES.Mode = CipherMode.ECB;DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;ICryptoTransform DESDecrypt = DES.CreateEncryptor();string result = "";try{byte[] Buffer = Convert.FromBase64String(a_strString);result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));}catch (Exception e){}return result;}/// <summary>/// Des解密/// </summary>/// <param name="encryptedString">密文</param>/// <param name="key">密钥</param>/// <returns></returns>public string Decrypt(string encryptedString, string key){byte[] btKey = Encoding.UTF8.GetBytes(key);DESCryptoServiceProvider des = new DESCryptoServiceProvider();des.Key = ASCIIEncoding.ASCII.GetBytes(key);des.Mode = CipherMode.ECB;des.Padding = System.Security.Cryptography.PaddingMode.PKCS7;using (MemoryStream ms = new MemoryStream()){byte[] inData = Convert.FromBase64String(encryptedString);try{using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)){cs.Write(inData, 0, inData.Length);cs.FlushFinalBlock();}return Encoding.UTF8.GetString(ms.ToArray());}catch{return encryptedString;}}}/// <summary>/// 3Des解密(密钥不能每8位重复，例如：123456781234567812345678，如果这样则算法退化为Des，C#会检测，不能使用)/// </summary>/// <param name="a_strString">密文</param>/// <param name="a_strKey">密钥</param>/// <returns></returns>public string Decrypt3DES(string a_strString, string a_strKey){TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();DES.Key = ASCIIEncoding.ASCII.GetBytes(a_strKey);DES.Mode = CipherMode.ECB;DES.Padding = System.Security.Cryptography.PaddingMode.PKCS7;ICryptoTransform DESDecrypt = DES.CreateDecryptor();string result = "";try{byte[] Buffer = Convert.FromBase64String(a_strString);result = ASCIIEncoding.ASCII.GetString(DESDecrypt.TransformFinalBlock(Buffer, 0, Buffer.Length));}catch (Exception e){}return result;}}