C# 实现3Des加密 解密

3Des对每个数据块进行了三次的DES加密算法，是DES的一个更安全的变形。比起最初的DES，3DES更为安全。

都是感觉一目了然的摘过来。

下面是加密解密的源码。ECB模式的。

 public class _3DESEncrypt
     {

         public static string Encrypt3DES(string a_strString, string a_strKey)
         {
             TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
             DES.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(a_strKey, "md5").Substring(, ));
             DES.Mode = CipherMode.ECB;
             ICryptoTransform DESEncrypt = DES.CreateEncryptor();
             byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(a_strString);
             return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, , Buffer.Length));
         }

         public static string Decrypt3DES(string a_strString, string a_strKey)
         {
             TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider();
             DES.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(a_strKey, "md5").Substring(, ));
             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, , Buffer.Length));

                 //MemoryStream msDecrypt = new MemoryStream(Buffer);
                 //CryptoStream csDecrypt = new CryptoStream(msDecrypt,
                 //       DES.CreateDecryptor(DES.Key, DES.IV),
                 //       CryptoStreamMode.Read);

                 //// Create buffer to hold the decrypted data.
                 //byte[] fromEncrypt = new byte[Buffer.Length];

                 //// Read the decrypted data out of the crypto stream
                 //// and place it into the temporary buffer.
                 //csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
                 //result = System.Text.Encoding.Default.GetString(fromEncrypt);
             }
             catch (Exception e)
             {
             }
             return result;

         }
     }

里面加解密都是在DES的基础上实现、区别在于3Des的Key值是24位、DES而是8位。
DES的加密解密源码：http://www.cnblogs.com/tainshi/p/3501258.html

对于3DES算法的CBC模式、我是新人存在迷惑、解密出来的数据有乱码现象。大大们有这方面有关的文章、推荐给我喽。