تحلیل کد

[Reza,M]

با سلام
از دوستان کسی میتونه منو در تحلیل این کد کمک کنه

using System.Security.Cryptography;


namespace WindowsFormsApplication9
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

}

const int keySize = 1024;
string publicAndPrivateKey;
string publicKey;



private void button1_Click(object sender, EventArgs e)
{
Form1.GenerateKeys(keySize, out publicKey, out publicAndPrivateKey);
string text = txt_clear.Text;

string encrypted = Form1.EncryptText(text, keySize, publicKey);
string decrypted = Form1.DecryptText(encrypted, keySize, publicAndPrivateKey);
txt_cipher.Text = encrypted;
}


private void button2_Click(object sender, EventArgs e)
{
Form1.GenerateKeys(keySize, out publicKey, out publicAndPrivateKey);
string text = txt_clear.Text;
// string text = "reza";
string encrypted = Form1.EncryptText(text, keySize, publicKey);
string decrypted = Form1.DecryptText(encrypted, keySize, publicAndPrivateKey);
txt_plain.Text = decrypted;
}



private static bool _optimalAsymmetricEncryptionPadding = false;

public static void GenerateKeys(int keySize, out string publicKey, out string publicAndPrivateKey)
{
using (var provider = new RSACryptoServiceProvider(keySize))
{
publicKey = provider.ToXmlString(false);
publicAndPrivateKey = provider.ToXmlString(true);
}
}

public static string EncryptText(string text, int keySize, string publicKeyXml)
{
var encrypted = Encrypt(Encoding.UTF8.GetBytes(text), keySize, publicKeyXml);
return Convert.ToBase64String(encrypted);
}

public static byte[] Encrypt(byte[] data, int keySize, string publicKeyXml)
{
if (data == null || data.Length == 0) throw new ArgumentException("Data are empty", "data");
int maxLength = GetMaxDataLength(keySize);
if (data.Length > maxLength) throw new ArgumentException(String.Format("Maximum data length is {0}", maxLength), "data");
if (!IsKeySizeValid(keySize)) throw new ArgumentException("Key size is not valid", "keySize");
if (String.IsNullOrEmpty(publicKeyXml)) throw new ArgumentException("Key is null or empty", "publicKeyXml");

using (var provider = new RSACryptoServiceProvider(keySize))
{
provider.FromXmlString(publicKeyXml);
return provider.Encrypt(data, _optimalAsymmetricEncryptionPadding);
}
}

public static string DecryptText(string text, int keySize, string publicAndPrivateKeyXml)
{
var decrypted = Decrypt(Convert.FromBase64String(text), keySize, publicAndPrivateKeyXml);
return Encoding.UTF8.GetString(decrypted);
}

public static byte[] Decrypt(byte[] data, int keySize, string publicAndPrivateKeyXml)
{
if (data == null || data.Length == 0) throw new ArgumentException("Data are empty", "data");
if (!IsKeySizeValid(keySize)) throw new ArgumentException("Key size is not valid", "keySize");
if (String.IsNullOrEmpty(publicAndPrivateKeyXml)) throw new ArgumentException("Key is null or empty", "publicAndPrivateKeyXml");

using (var provider = new RSACryptoServiceProvider(keySize))
{
provider.FromXmlString(publicAndPrivateKeyXml);
return provider.Decrypt(data, _optimalAsymmetricEncryptionPadding);
}
}

public static int GetMaxDataLength(int keySize)
{
if (_optimalAsymmetricEncryptionPadding)
{
return ((keySize - 384) / 8) + 7;
}
return ((keySize - 384) / 8) + 37;
}

public static bool IsKeySizeValid(int keySize)
{
return keySize >= 384 &&
keySize <= 16384 &&
keySize % 8 == 0;
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void button3_Click(object sender, EventArgs e)
{
Application.Exit();
}




}
}

[محمد رضا فاتحی]

دقیقا چی رو می خوای؟؟؟؟
یه کلاس از نوع فرمه که توابع مربوط به رمزنگاری(رشته و فایل) داخلش اومده حالا دقیقا منظورت از تحلیل چیه من نمی دونم:افسرده::افسرده::افسرده:

[Reza,M]

مثلا کار این قسمت چیه

public static int GetMaxDataLength(int keySize) {
if (_optimalAsymmetricEncryptionPadding)
{
return ((keySize - 384) / 8) + 7;
}
return ((keySize - 384) / 8) + 37;
}



و یا

public static bool IsKeySizeValid(int keySize) {
return keySize >= 384 &&
keySize <= 16384 &&
keySize % 8 == 0;
}

[khokhan]

مثلا کار این قسمت چیه

public static int GetMaxDataLength(int keySize) {
if (_optimalAsymmetricEncryptionPadding)
{
return ((keySize - 384) / 8) + 7;
}
return ((keySize - 384) / 8) + 37;
}



و یا

public static bool IsKeySizeValid(int keySize) {
return keySize >= 384 &&
keySize <= 16384 &&
keySize % 8 == 0;
}




می خوای keygen بسازی؟؟؟؟؟؟؟؟:لبخند:

[Reza,M]

می خوای keygen بسازی؟؟؟؟؟؟؟؟:لبخند:

نه بابا keygen چیه؟؟!:لبخند: