200分相送，那位大侠可以帮我写出这个函数的逆过程

[芹菜大哥]

要求下面这个过程的相反函数，即输入一个结果（如：celerySingleLicense）就能得到下面这个函数的输入
using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
private string DecryptLicenseData(string input)
{
byte[] encryptionKeyBytes = new byte[] { 0x39, 0x48, 0x42, 50, 0x38, 0x31, 70, 0x36 }
DESCryptoServiceProvider provider1 = new DESCryptoServiceProvider();
ICryptoTransform transform1 = provider1.CreateDecryptor(encryptionKeyBytes, encryptionKeyBytes); //创建解密对象
MemoryStream stream1 = new MemoryStream();
CryptoStream stream2 = new CryptoStream(stream1, transform1, CryptoStreamMode.Write); //将数据流链接到加密转换流
byte[] buffer1 = new byte[input.Length]; //输入字符转换为byte数组
try
{
buffer1 = Convert.FromBase64CharArray(input.ToCharArray(), 0, input.Length);
}
catch (Exception)
{
return "Error. Input Data is not base64 encoded.";
}
long num1 = 0;
long num2 = input.Length;
try
{
while (num2 >= num1)
{
stream2.Write(buffer1, 0, buffer1.Length);
num1 = stream1.Length + Convert.ToUInt32((int) ((buffer1.Length / provider1.BlockSize) * provider1.BlockSize));
}
string text1 = new ASCIIEncoding().GetString(stream1.GetBuffer(), 0, (int) stream1.Length);
string text2 = text1.Substring(0, 5);
int num3 = Convert.ToInt32(text2);
return text1.Substring(5, num3);
}
catch (Exception)
{
return "";
}
}

[Darren_chen]

什么阿
看不懂

[ggygd]

up

[yuesongboy]

mark

[Yuna_2z]

MARK

[jinsinuo88]

加密方法
///input 为 加密内容
///encryptionKeyBytes 为 加密KEy

public string Encrypt()
{
string strResult = "";
string input = "zhaoyingqi";
input = String.Format("{0,5:00000}"+input, input.Length);
byte[] encryptionKeyBytes = new byte[] { 0x39, 0x48, 0x42, 50, 0x38, 0x31, 70, 0x36 };
byte[] rbData = Encoding.Default.GetBytes(input);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
ICryptoTransform desEncrypt = des.CreateEncryptor(encryptionKeyBytes,encryptionKeyBytes);
MemoryStream mStream = new MemoryStream(rbData);
CryptoStream cs = new CryptoStream(mStream, desEncrypt, CryptoStreamMode.Read);
MemoryStream mOut = new MemoryStream();
int bytesRead;
byte[] output = new byte[1024];
do
{
bytesRead = cs.Read(output,0,1024);
if (bytesRead != 0)
mOut.Write(output,0,bytesRead);
} while (bytesRead > 0);
if (mOut.Length == 0)
strResult = "";
else
strResult = Convert.ToBase64String(mOut.GetBuffer(), 0, (int)mOut.Length);
return strResult;
}

[芹菜大哥]

谢谢梁亿提供和大家的支持，现在结贴