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(0, 24));
            DES.Mode = CipherMode.ECB;
            ICryptoTransform DESEncrypt = DES.CreateEncryptor();
            byte[] Buffer = ASCIIEncoding.ASCII.GetBytes(a_strString);
            return Convert.ToBase64String(DESEncrypt.TransformFinalBlock(Buffer, 0, 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(0, 24));
            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));

                //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。