请大家翻译一下这段代码的意思，菜鸟看不懂！
amespace Sky.Decrypt{
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security.Cryptography;
using System.Text;
public class Decryption
{
private string temporaryFileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "license.dat");
public string DecryptFile(string path, string key)
{
string str = "";
if (!File.Exists(path))
{
throw new Exception("File is not exist.");
}
byte[] rgbIV = new byte[] { 0x12, 0x34, 0x56, 120, 0x90, 0xab, 0xcd, 0xef };
byte[] bytes = Encoding.UTF8.GetBytes(key);
FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read);
long length = stream.Length;
DES des = new DESCryptoServiceProvider();
CryptoStream stream2 = new CryptoStream(stream, des.CreateDecryptor(bytes, rgbIV), CryptoStreamMode.Read);
StreamReader reader = new StreamReader(stream2);
try
{
str = reader.ReadToEnd();
}
finally
{
stream.Close();
}
return str;
}
public string DecryptString(string data, string key)
{
string str = "";
if ((data == null) || (data == ""))
{
throw new Exception("Data is empty.");
}
byte[] rgbIV = new byte[] { 0x12, 0x34, 0x56, 120, 0x90, 0xab, 0xcd, 0xef };
byte[] bytes = Encoding.UTF8.GetBytes(key);
MemoryStream stream = new MemoryStream();
DES des = new DESCryptoServiceProvider();
CryptoStream stream2 = new CryptoStream(stream, des.CreateDecryptor(bytes, rgbIV), CryptoStreamMode.Write);
try
{
byte[] buffer = Convert.FromBase64String(data);
stream2.Write(buffer, 0, buffer.Length);
stream2.FlushFinalBlock();
str = Encoding.UTF8.GetString(stream.ToArray());
}
finally
{
stream2.Close();
stream.Close();
}
return str;
}
private string DeserializeFile(string path)
{
string str = "";
if (!File.Exists(path))
{
throw new Exception("File is not exist.");
}
IFormatter formatter = new BinaryFormatter();
FileStream serializationStream = new FileStream(path, FileMode.Open, FileAccess.Read);
try
{
str = (string) formatter.Deserialize(serializationStream);
}
finally
{
serializationStream.Close();
}
return str;
}
public string GetString(string path)
{
return this.DeserializeFile(path);
}
}
}
--------------------编程问答-------------------- 分别是解密文件、解密字符串、反序列化文件等函数
你只管调用这些函数就行了，函数体内部的你不用了解
--------------------编程问答-------------------- 那解密密码是什么呢？能知道解密的密码吗？
--------------------编程问答-------------------- 加密用的是什么密码，解密就用什么密码
解密的前提必须知道加密密码，才能解密，跟函数体代码无关 --------------------编程问答-------------------- 现在不知道加密的密码，所以从这段代码中能看出加密的密码吗？
--------------------编程问答-------------------- 能看出来。。。还需要加密吗？
--------------------编程问答--------------------
看不出来 --------------------编程问答-------------------- --------------------编程问答-------------------- --------------------编程问答-------------------- --------------------编程问答-------------------- --------------------编程问答--------------------
能看出来。。。还需要加密吗？
--------------------编程问答--------------------
建议，单步调试，结合 msdn 看补充：.NET技术 , C#
