using System; using System.Collections.Generic; using System.Text; using System.Security.Cryptography; using System.IO; namespace ConsoleApplication1 {     /// <summary>     /// 加解密类     /// </summary>     public class EncryptHelper     {                 //构造一个对称算法         private SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider();         #region 加密解密函数         /// <summary>         /// 字符串的加密         /// </summary>         /// <param name="Value">要加密的字符串</param>         /// <param name="sKey">密钥，必须32位</param>         /// <param name="sIV">向量，必须是12个字符</param>         /// <returns>加密后的字符串</returns>         public string EncryptString(string Value, string sKey,string sIV)         {             try             {                 ICryptoTransform ct;                 MemoryStream ms;                 CryptoStream cs;                 byte[] byt;                 mCSP.Key = Convert.FromBase64String(sKey);                 mCSP.IV = Convert.FromBase64String(sIV);                 //指定加密的运算模式                 mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;                 //获取或设置加密算法的填充模式                 mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;                 ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);//创建加密对象                 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());             }             catch (Exception ex)             {                 //MessageBox.Show(ex.Message, "出现异常", MessageBoxButtons.OK, MessageBoxIcon.Warning);                 return ("Error in Encrypting " + ex.Message);             }         }         /// <summary>         /// 解密字符串         /// </summary>         /// <param name="Value">加密后的字符串</param>         /// <param name="sKey">密钥，必须32位</param>         /// <param name="sIV">向量，必须是12个字符</param>         /// <returns>解密后的字符串</returns>         public string DecryptString(string Value, string sKey, string sIV)         {             try             {                 ICryptoTransform ct;//加密转换运算                 MemoryStream ms;//内存流                 CryptoStream cs;//数据流连接到数据加密转换的流                 byte[] byt;                 //将3DES的密钥转换成byte                 mCSP.Key = Convert.FromBase64String(sKey);                 //将3DES的向量转换成byte                 mCSP.IV = Convert.FromBase64String(sIV);                 mCSP.Mode = System.Security.Cryptography.CipherMode.ECB;                 mCSP.Padding = System.Security.Cryptography.PaddingMode.PKCS7;                 ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);//创建对称解密对象                 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());             }             catch (Exception ex)             {                 //MessageBox.Show(ex.Message, "出现异常", MessageBoxButtons.OK, MessageBoxIcon.Warning);                 return ("Error in Decrypting " + ex.Message);             }         }         #endregion     } }

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication1 {     class Program     {         static void Main(string[] args)         {             EncryptHelper helper = new EncryptHelper();             //加密             string oldValue = "13800138000";             //加密后结果             //密钥,必须32位             string sKey = "qJzGEh6hESZDVJeCnFPGuxzaiB7NLQM5";             //向量，必须是12个字符             string sIV = "andyliu1234=";             //print             string newValue =  helper.EncryptString(oldValue,sKey,sIV);             Console.WriteLine("加密后:"+ newValue);             //解密             string desValue = helper.DecryptString(newValue,sKey,sIV);             //             Console.WriteLine("解密后:"+ desValue);             Console.ReadLine();         }     } }