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ASP.NET(C#)常用加密类调用的讲解

翻译|使用教程|编辑：杨鹏连|2021-06-09 11:39:30.603|阅读 280 次

概述：说到软件安全保护，数据加密技术是网络中最基本的安全技术，小编为大家介绍了常用数据加密和解密方法汇总，以及给出相关实现代码。

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以TripleDES为例，结合dotnet分析加密解密的各个步骤

六、非对称加密之RSA加密和解密的讲解 

      RSA公钥加密算法是1977年由Ron Rivest、Adi Shamirh和LenAdleman在（美国麻省理工学院）开发的。RSA取名来自开发他们三者的名字。RSA是目前最有影响力的公钥加密算法，它能够抵抗到目前为止已知的所有密码攻击，已被ISO推荐为公钥数据加密标准。RSA算法基于一个十分简单的数论事实：将两个大素数相乘十分容易，但那时想要对其乘积进行因式分解却极其困难，因此可以将乘积公开作为加密密钥。RSA算法是第一个能同时用于加密和数字签名的算法，也易于理解和操作。

  RSA是被研究得最广泛的公钥算法，从提出到现在已近二十年，经历了各种攻击的考验，逐渐为人们接受，普遍认为是目前最优秀的公钥方案之一。RSA的安全性依赖于大数的因子分解，但并没有从理论上证明破译RSA的难度与大数分解难度等价。即RSA的重大缺陷是无法从理论上把握它的保密性能如何，而且密码学界多数人士倾向于因子分解不是NPC问题。

  RSA的缺点主要有：

A)产生密钥很麻烦，受到素数产生技术的限制，因而难以做到一次一密。
B)分组长度太大，为保证安全性，n 至少也要 600bits以上，使运算代价很高，尤其是速度较慢，较对称密码算法慢几个数量级；且随着大数分解技术的发展，这个长度还在增加，不利于数据格式的标准化。目前，SET(Secure Electronic Transaction)协议中要求CA采用2048bits长的密钥，其他实体使用1024比特的密钥。C)RSA密钥长度随着保密级别提高，增加很快。下表列出了对同一安全级别所对应的密钥长度。

 这种算法1978年就出现了，它是第一个既能用于数据加密也能用于数字签名的算法。它易于理解和操作，也很流行。算法的名字以发明者的名字命名：Ron Rivest, AdiShamir 和Leonard Adleman。早在1973年，英国国家通信总局的数学家Clifford Cocks就发现了类似的算法。但是他的发现被列为绝密，直到1998年才公诸于世。

  RSA算法是一种非对称密码算法，所谓非对称，就是指该算法需要一对密钥，使用其中一个加密，则需要用另一个才能解密。

  RSA的算法涉及三个参数，n、e1、e2。

  其中，n是两个大质数p、q的积，n的二进制表示时所占用的位数，就是所谓的密钥长度。

  e1和e2是一对相关的值，e1可以任意取，但要求e1与(p-1)*(q-1)互质；再选择e2，要求(e2*e1)mod((p-1)*(q-1))=1。

  (n及e1),(n及e2)就是密钥对。

  RSA加解密的算法完全相同,设A为明文，B为密文，则：A=B^e1 mod n；B=A^e2 mod n；

  e1和e2可以互换使用，即：
  A=B^e2 mod n；B=A^e1 mod n;

C#代码实现

需引用using System.Security.Cryptography;

/// <summary>
        /// RSA加密
        /// </summary>
        /// <param name="publickey"></param>
        /// <param name="content"></param>
        /// <returns></returns>
        public static string RSAEncrypt(string publickey, string content)
        {
            publickey = @"<RSAKeyValue><Modulus>5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            rsa.FromXmlString(publickey);
            cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);
        </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> Convert.ToBase64String(cipherbytes);
    }

    </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
    <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> RSA解密
    </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
    <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="privatekey"&gt;&lt;/param&gt;</span>
    <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="content"&gt;&lt;/param&gt;</span>
    <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;&lt;/returns&gt;</span>
    <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> RSADecrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> privatekey, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> content)
    {
        privatekey </span>= <span style="line-height:1.5;color:rgb(128,0,0);">@"</span><span style="line-height:1.5;color:rgb(128,0,0);">&lt;RSAKeyValue&gt;&lt;Modulus&gt;5m9m14XH3oqLJ8bNGw9e4rGpXpcktv9MSkHSVFVMjHbfv+SJ5v0ubqQxa5YjLN4vc49z7SVju8s0X4gZ6AzZTn06jzWOgyPRV54Q4I0DCYadWW4Ze3e+BOtwgVU1Og3qHKn8vygoj40J6U85Z/PTJu3hN1m75Zr195ju7g9v4Hk=&lt;/Modulus&gt;&lt;Exponent&gt;AQAB&lt;/Exponent&gt;&lt;P&gt;/hf2dnK7rNfl3lbqghWcpFdu778hUpIEBixCDL5WiBtpkZdpSw90aERmHJYaW2RGvGRi6zSftLh00KHsPcNUMw==&lt;/P&gt;&lt;Q&gt;6Cn/jOLrPapDTEp1Fkq+uz++1Do0eeX7HYqi9rY29CqShzCeI7LEYOoSwYuAJ3xA/DuCdQENPSoJ9KFbO4Wsow==&lt;/Q&gt;&lt;DP&gt;ga1rHIJro8e/yhxjrKYo/nqc5ICQGhrpMNlPkD9n3CjZVPOISkWF7FzUHEzDANeJfkZhcZa21z24aG3rKo5Qnw==&lt;/DP&gt;&lt;DQ&gt;MNGsCB8rYlMsRZ2ek2pyQwO7h/sZT8y5ilO9wu08Dwnot/7UMiOEQfDWstY3w5XQQHnvC9WFyCfP4h4QBissyw==&lt;/DQ&gt;&lt;InverseQ&gt;EG02S7SADhH1EVT9DD0Z62Y0uY7gIYvxX/uq+IzKSCwB8M2G7Qv9xgZQaQlLpCaeKbux3Y59hHM+KpamGL19Kg==&lt;/InverseQ&gt;&lt;D&gt;vmaYHEbPAgOJvaEXQl+t8DQKFT1fudEysTy31LTyXjGu6XiltXXHUuZaa2IPyHgBz0Nd7znwsW/S44iql0Fen1kzKioEL3svANui63O3o5xdDeExVM6zOf1wUUh/oldovPweChyoAdMtUzgvCbJk1sYDJf++Nr0FeNW1RB1XG30=&lt;/D&gt;&lt;/RSAKeyValue&gt;</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">;
        RSACryptoServiceProvider rsa </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> RSACryptoServiceProvider();
        </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span><span style="line-height:1.5;">[] cipherbytes;
        rsa.FromXmlString(privatekey);
        cipherbytes </span>= rsa.Decrypt(Convert.FromBase64String(content), <span style="line-height:1.5;color:rgb(0,0,255);">false</span><span style="line-height:1.5;">);

        </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> Encoding.UTF8.GetString(cipherbytes);
    }<br></span></pre>

七、ASP.NET(C#)常用加密类调用的讲解

1、C#常用加密解密类库代码如下： 
/// <summary>
      /// MD5 加密静态方法
      /// </summary>
      /// <param name="EncryptString">待加密的密文</param>
      /// <returns>returns</returns>
      public static string MD5Encrypt(string EncryptString)
      {
          if (string.IsNullOrEmpty(EncryptString)) { throw (new Exception("密文不得为空")); }
          MD5 m_ClassMD5 = new MD5CryptoServiceProvider();
          string m_strEncrypt = "";
          try
          {
              m_strEncrypt = BitConverter.ToString(m_ClassMD5.ComputeHash(Encoding.Default.GetBytes(EncryptString))).Replace("-", "");
          }
         catch (ArgumentException ex) { throw ex; }
         catch (CryptographicException ex) { throw ex; }
         catch (Exception ex) { throw ex; }
          finally { m_ClassMD5.Clear(); }
          return m_strEncrypt;
      }
  </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> DES 加密(数据加密标准，速度较快，适用于加密大量数据的场合)
  </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待加密的密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptKey"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">加密的密钥</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">returns</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/returns&gt;</span>
  <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> DESEncrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> EncryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> EncryptKey)
  {
      </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(EncryptString)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密文不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(EncryptKey)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (EncryptKey.Length != <span style="line-height:1.5;color:rgb(128,0,128);">8</span>) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥必须为8位</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btIV = { <span style="line-height:1.5;color:rgb(128,0,128);">0x12</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x34</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x56</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x78</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x90</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xAB</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xCD</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xEF</span><span style="line-height:1.5;"> };
      </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strEncrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     DESCryptoServiceProvider m_DESProvider </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> DESCryptoServiceProvider();
      </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
      {
          </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btEncryptString =<span style="line-height:1.5;"> Encoding.Default.GetBytes(EncryptString);
          MemoryStream m_stream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> MemoryStream();
          CryptoStream m_cstream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> CryptoStream(m_stream, m_DESProvider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);
          m_cstream.Write(m_btEncryptString, </span><span style="line-height:1.5;color:rgb(128,0,128);">0</span><span style="line-height:1.5;">, m_btEncryptString.Length);
          m_cstream.FlushFinalBlock();
          m_strEncrypt </span>=<span style="line-height:1.5;"> Convert.ToBase64String(m_stream.ToArray());
          m_stream.Close(); m_stream.Dispose();
          m_cstream.Close(); m_cstream.Dispose();
      }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (IOException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (CryptographicException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (ArgumentException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">finally</span><span style="line-height:1.5;"> { m_DESProvider.Clear(); }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strEncrypt;
  }

  </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> DES 解密(数据加密标准，速度较快，适用于加密大量数据的场合)
  </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待解密的密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptKey"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">解密的密钥</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
  <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">returns</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/returns&gt;</span>
  <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> DESDecrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> DecryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> DecryptKey)
  {
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(DecryptString)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密文不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(DecryptKey)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (DecryptKey.Length != <span style="line-height:1.5;color:rgb(128,0,128);">8</span>) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥必须为8位</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
      </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btIV = { <span style="line-height:1.5;color:rgb(128,0,128);">0x12</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x34</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x56</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x78</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x90</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xAB</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xCD</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xEF</span><span style="line-height:1.5;"> };
     </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strDecrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     DESCryptoServiceProvider m_DESProvider </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> DESCryptoServiceProvider();
     </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
    {
         </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btDecryptString =<span style="line-height:1.5;"> Convert.FromBase64String(DecryptString);
         MemoryStream m_stream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> MemoryStream();
         CryptoStream m_cstream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> CryptoStream(m_stream, m_DESProvider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);
         m_cstream.Write(m_btDecryptString, </span><span style="line-height:1.5;color:rgb(128,0,128);">0</span><span style="line-height:1.5;">, m_btDecryptString.Length);
         m_cstream.FlushFinalBlock();
         m_strDecrypt </span>=<span style="line-height:1.5;"> Encoding.Default.GetString(m_stream.ToArray());
         m_stream.Close(); m_stream.Dispose();
         m_cstream.Close(); m_cstream.Dispose();
     }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (IOException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (CryptographicException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (ArgumentException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">finally</span><span style="line-height:1.5;"> { m_DESProvider.Clear(); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strDecrypt;
 }
 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> RC2 加密(用变长密钥对大量数据进行加密)
 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待加密密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptKey"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">加密密钥</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">returns</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/returns&gt;</span>
 <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> RC2Encrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> EncryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> EncryptKey)
 {
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(EncryptString)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密文不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(EncryptKey)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (EncryptKey.Length &lt; <span style="line-height:1.5;color:rgb(128,0,128);">5</span> || EncryptKey.Length &gt; <span style="line-height:1.5;color:rgb(128,0,128);">16</span>) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥必须为5-16位</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strEncrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btIV = { <span style="line-height:1.5;color:rgb(128,0,128);">0x12</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x34</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x56</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x78</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x90</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xAB</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xCD</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xEF</span><span style="line-height:1.5;"> };
     RC2CryptoServiceProvider m_RC2Provider </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> RC2CryptoServiceProvider();
     </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
    {
         </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btEncryptString =<span style="line-height:1.5;"> Encoding.Default.GetBytes(EncryptString);
         MemoryStream m_stream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> MemoryStream();
         CryptoStream m_cstream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> CryptoStream(m_stream, m_RC2Provider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);
         m_cstream.Write(m_btEncryptString, </span><span style="line-height:1.5;color:rgb(128,0,128);">0</span><span style="line-height:1.5;">, m_btEncryptString.Length);
         m_cstream.FlushFinalBlock();
         m_strEncrypt </span>=<span style="line-height:1.5;"> Convert.ToBase64String(m_stream.ToArray());
         m_stream.Close(); m_stream.Dispose();
        m_cstream.Close(); m_cstream.Dispose();
     }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (IOException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (CryptographicException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (ArgumentException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">finally</span><span style="line-height:1.5;"> { m_RC2Provider.Clear(); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strEncrypt;
 }

 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> RC2 解密(用变长密钥对大量数据进行加密)
 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待解密密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptKey"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">解密密钥</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">returns</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/returns&gt;</span>
 <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> RC2Decrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> DecryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> DecryptKey)
 {
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(DecryptString)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密文不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(DecryptKey)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
    </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (DecryptKey.Length &lt; <span style="line-height:1.5;color:rgb(128,0,128);">5</span> || DecryptKey.Length &gt; <span style="line-height:1.5;color:rgb(128,0,128);">16</span>) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥必须为5-16位</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btIV = { <span style="line-height:1.5;color:rgb(128,0,128);">0x12</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x34</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x56</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x78</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0x90</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xAB</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xCD</span>, <span style="line-height:1.5;color:rgb(128,0,128);">0xEF</span><span style="line-height:1.5;"> };
     </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strDecrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     RC2CryptoServiceProvider m_RC2Provider </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> RC2CryptoServiceProvider();
    </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
    {
        </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btDecryptString =<span style="line-height:1.5;"> Convert.FromBase64String(DecryptString);
         MemoryStream m_stream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> MemoryStream();
         CryptoStream m_cstream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> CryptoStream(m_stream, m_RC2Provider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);
         m_cstream.Write(m_btDecryptString, </span><span style="line-height:1.5;color:rgb(128,0,128);">0</span><span style="line-height:1.5;">, m_btDecryptString.Length);
         m_cstream.FlushFinalBlock();
         m_strDecrypt </span>=<span style="line-height:1.5;"> Encoding.Default.GetString(m_stream.ToArray());
         m_stream.Close(); m_stream.Dispose();
         m_cstream.Close(); m_cstream.Dispose();
     }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (IOException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
    </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (CryptographicException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (ArgumentException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
    </span><span style="line-height:1.5;color:rgb(0,0,255);">finally</span><span style="line-height:1.5;"> { m_RC2Provider.Clear(); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strDecrypt;
 }

 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> 3DES 加密(基于DES，对一块数据用三个不同的密钥进行三次加密，强度更高)
 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待加密密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptKey1"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">密钥一</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptKey2"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">密钥二</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
<span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptKey3"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">密钥三</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">returns</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/returns&gt;</span>
 <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> DES3Encrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> EncryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span> EncryptKey1, <span style="line-height:1.5;color:rgb(0,0,255);">string</span> EncryptKey2, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> EncryptKey3)
 {
     </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strEncrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
     {
         m_strEncrypt </span>=<span style="line-height:1.5;"> DESEncrypt(EncryptString, EncryptKey3);
         m_strEncrypt </span>=<span style="line-height:1.5;"> DESEncrypt(m_strEncrypt, EncryptKey2);
        m_strEncrypt </span>=<span style="line-height:1.5;"> DESEncrypt(m_strEncrypt, EncryptKey1);
     }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strEncrypt;
 }

 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> 3DES 解密(基于DES，对一块数据用三个不同的密钥进行三次加密，强度更高)
 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待解密密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptKey1"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">密钥一</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptKey2"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">密钥二</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptKey3"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">密钥三</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">returns</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/returns&gt;</span>
 <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> DES3Decrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> DecryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span> DecryptKey1, <span style="line-height:1.5;color:rgb(0,0,255);">string</span> DecryptKey2, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> DecryptKey3)
 {
     </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strDecrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
     {
        m_strDecrypt </span>=<span style="line-height:1.5;"> DESDecrypt(DecryptString, DecryptKey1);
         m_strDecrypt </span>=<span style="line-height:1.5;"> DESDecrypt(m_strDecrypt, DecryptKey2);
         m_strDecrypt </span>=<span style="line-height:1.5;"> DESDecrypt(m_strDecrypt, DecryptKey3);
     }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strDecrypt;
 }

 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> AES 加密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待加密密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="EncryptKey"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">加密密钥</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
<span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;&lt;/returns&gt;</span>
<span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> AESEncrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> EncryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> EncryptKey)
 {
    </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(EncryptString)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密文不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(EncryptKey)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strEncrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btIV = Convert.FromBase64String(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">Rkb4jvUy/ye7Cd7k89QQgQ==</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">);
     Rijndael m_AESProvider </span>=<span style="line-height:1.5;"> Rijndael.Create();
     </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
     {
         </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btEncryptString =<span style="line-height:1.5;"> Encoding.Default.GetBytes(EncryptString);
         MemoryStream m_stream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> MemoryStream();
         CryptoStream m_csstream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> CryptoStream(m_stream, m_AESProvider.CreateEncryptor(Encoding.Default.GetBytes(EncryptKey), m_btIV), CryptoStreamMode.Write);
         m_csstream.Write(m_btEncryptString, </span><span style="line-height:1.5;color:rgb(128,0,128);">0</span><span style="line-height:1.5;">, m_btEncryptString.Length); m_csstream.FlushFinalBlock();
         m_strEncrypt </span>=<span style="line-height:1.5;"> Convert.ToBase64String(m_stream.ToArray());
         m_stream.Close(); m_stream.Dispose();
         m_csstream.Close(); m_csstream.Dispose();
     }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (IOException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (CryptographicException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (ArgumentException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">finally</span><span style="line-height:1.5;"> { m_AESProvider.Clear(); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strEncrypt;
 }

 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span><span style="line-height:1.5;color:rgb(0,128,0);"> AES 解密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
 </span><span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;/summary&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptString"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">待解密密文</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;param name="DecryptKey"&gt;</span><span style="line-height:1.5;color:rgb(0,128,0);">解密密钥</span><span style="line-height:1.5;color:rgb(128,128,128);">&lt;/param&gt;</span>
 <span style="line-height:1.5;color:rgb(128,128,128);">///</span> <span style="line-height:1.5;color:rgb(128,128,128);">&lt;returns&gt;&lt;/returns&gt;</span>
 <span style="line-height:1.5;color:rgb(0,0,255);">public</span> <span style="line-height:1.5;color:rgb(0,0,255);">static</span> <span style="line-height:1.5;color:rgb(0,0,255);">string</span> AESDecrypt(<span style="line-height:1.5;color:rgb(0,0,255);">string</span> DecryptString, <span style="line-height:1.5;color:rgb(0,0,255);">string</span><span style="line-height:1.5;"> DecryptKey)
 {
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(DecryptString)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密文不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">if</span> (<span style="line-height:1.5;color:rgb(0,0,255);">string</span>.IsNullOrEmpty(DecryptKey)) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span> (<span style="line-height:1.5;color:rgb(0,0,255);">new</span> Exception(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">密钥不得为空</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">)); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">string</span> m_strDecrypt = <span style="line-height:1.5;color:rgb(128,0,0);">""</span><span style="line-height:1.5;">;
     </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btIV = Convert.FromBase64String(<span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;color:rgb(128,0,0);">Rkb4jvUy/ye7Cd7k89QQgQ==</span><span style="line-height:1.5;color:rgb(128,0,0);">"</span><span style="line-height:1.5;">);
     Rijndael m_AESProvider </span>=<span style="line-height:1.5;"> Rijndael.Create();
     </span><span style="line-height:1.5;color:rgb(0,0,255);">try</span><span style="line-height:1.5;">
     {
         </span><span style="line-height:1.5;color:rgb(0,0,255);">byte</span>[] m_btDecryptString =<span style="line-height:1.5;"> Convert.FromBase64String(DecryptString);
         MemoryStream m_stream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> MemoryStream();
         CryptoStream m_csstream </span>= <span style="line-height:1.5;color:rgb(0,0,255);">new</span><span style="line-height:1.5;"> CryptoStream(m_stream, m_AESProvider.CreateDecryptor(Encoding.Default.GetBytes(DecryptKey), m_btIV), CryptoStreamMode.Write);
         m_csstream.Write(m_btDecryptString, </span><span style="line-height:1.5;color:rgb(128,0,128);">0</span><span style="line-height:1.5;">, m_btDecryptString.Length); m_csstream.FlushFinalBlock();
         m_strDecrypt </span>=<span style="line-height:1.5;"> Encoding.Default.GetString(m_stream.ToArray());
         m_stream.Close(); m_stream.Dispose();
         m_csstream.Close(); m_csstream.Dispose();
     }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (IOException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (CryptographicException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (ArgumentException ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">catch</span> (Exception ex) { <span style="line-height:1.5;color:rgb(0,0,255);">throw</span><span style="line-height:1.5;"> ex; }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">finally</span><span style="line-height:1.5;"> { m_AESProvider.Clear(); }
     </span><span style="line-height:1.5;color:rgb(0,0,255);">return</span><span style="line-height:1.5;"> m_strDecrypt;
 }</span></pre>
2、数据加密和解密简单代码调用如下： 

Response.Write("<br>-----------MD5加密---------------<br>");        

Response.Write(SDKSecurity.MD5Encrypt("仰天一笑"));
Response.Write("<br>-----------DES加密---------------<br>");        

Response.Write(SDKSecurity.DESEncrypt("仰天一笑", "anson-xu"));        

Response.Write("<br>-----------DES解密---------------<br>");        

Response.Write(SDKSecurity.DESDecrypt("l06JvJ45r/lb9iKzSXl47Q==", "anson-xu"));
Response.Write("<br>-----------AES加密---------------<br>");    

Response.Write(SDKSecurity.AESEncrypt("仰天一笑", "ansonxuyu"));        

Response.Write("<br>-----------AES解密---------------<br>");        

Response.Write(SDKSecurity.AESDecrypt("avwKL+MO8+zoLHvzk0+TBA==", "ansonxuyu"));

3、数据加密和解密调用后运行效果图如下： 

★VMProtect

网络评价：加密的安全级别非常高，破解难度很大，但是加密数据多，需要注意系统的性能。

【下载试用】
 【在线购买】

★Themida

网络评价：用好其虚拟机保护功能，将关键敏感代码用虚拟机保护起来，能很好提高强度。

【下载试用】
 【在线购买】
★WinLicense

网络评价：WinLicense主要比Themida多了一个协议，可以设定使用时间，运行次数等功能，两者核心保护是一样的。

【下载试用】
 【在线购买】

慧都科技响应“全面加强知识产权保护，推动构建新发展格局”号召，加密解密产品为您的应用程序保驾护航！在线购买享受限时特惠，Go！>>


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