// RSA private key'lerin dosyaya yazilmasi
public void SavePrivateKey(string dirName, byte[] passphrase)
{
RSAParametersSerializable rsaPrivateKeyInfoSerializable = new RSAParametersSerializable(rsaPrivateKeyInfo);
rsaPrivateKeyInfoSerializable.Encrypt(passphrase);
Directory.CreateDirectory(FileDirectory.Create(dirName) + "Keys\\");
Serialization.WriteToBinaryFile(FileDirectory.Create(dirName) + "Keys\\" + ID, rsaPrivateKeyInfoSerializable, false);
}
// RSA private key'lerin dosyadan okunmasi
public RSAParameters GetPrivateKey(string dirName, Form form)
{
RSAParametersSerializable rsaPrivateKeyInfoSerializable = null;
DirectoryInfo dirInfo = new DirectoryInfo(FileDirectory.Create(dirName) + "Keys\\");
FileInfo[] files = dirInfo.GetFiles();
foreach (FileInfo file in files)
{
if (file.Name.Equals(ID))
{
rsaPrivateKeyInfoSerializable = Serialization.ReadFromBinaryFile <RSAParametersSerializable>(FileDirectory.Create(dirName) + "Keys\\" + ID);
}
}
Form8Passphrase formPassphrase = new Form8Passphrase(Name);
bool invalidPass = true;
int tryCount = 1;
while (invalidPass && tryCount <= 3)
{
formPassphrase.labelTry.Visible = (tryCount == 2 || tryCount == 3) ? true : false;
formPassphrase.labelTry.Text = "Yanlış parola. Deneme: " + tryCount + " / 3.";
formPassphrase.ShowDialog(form);
byte[] passphrase = null;
if (formPassphrase.DialogResult == DialogResult.OK)
{
passphrase = Encoding.ASCII.GetBytes(formPassphrase.textBoxPassphrase.Text);
byte[] hashedInputPassphrase = SHA256Salted.GenerateSaltedHash(passphrase, salt);
if (SHA256Salted.CompareByteArrays(hashedInputPassphrase, hashedPassphrase))
{
rsaPrivateKeyInfoSerializable.Decrypt(passphrase);
invalidPass = false;
}
else
{
invalidPass = true;
tryCount++;
}
}
else
{
break;
}
}
if (tryCount > 3)
{
return(new RSAParameters());
}
return(rsaPrivateKeyInfoSerializable.RSAParameters);
}