//找到隐藏文件，改回后缀，解密，恢复为隐藏的已解密的txt文件/
public static FileStream DecryptionFile(string filePath, string encryptKey)
{
FileStream fs = null;
string sourcefileName = filePath;
if (!File.Exists(sourcefileName))
{
return(fs);
}
string destfileName = System.IO.Path.ChangeExtension(sourcefileName, ".txt");
File.Move(sourcefileName, destfileName);
File.SetAttributes(destfileName, FileAttributes.Normal);
FileEncrypt.DecryptFile(destfileName, encryptKey, (int max, int value) => { });
fs = new FileStream(destfileName, FileMode.Open);
fs = new FileStream(sourcefileName, FileMode.Open);
return(fs);
}
private void _decrypt_file()
{
//未实例化密钥管理类
if (_key_manager == null)
{
return;
}
try
{
if (File.Exists(_output_path + ".decrypting"))
{
File.Delete(_output_path + ".decrypting"); //删除已有的冲突文件
}
//重命名
if (_output_path.EndsWith(".bcsd"))
{
//xxxxx.bcsd -> xxxxx.decrypting
_output_path = _output_path.Substring(0, _output_path.Length - 5);
File.Move(_output_path + ".bcsd", _output_path + ".decrypting");
}
else
{
File.Move(_output_path, _output_path + ".decrypting"); //xxxxx.xx -> xxxxx.xx.decrypting
}
var fs = new FileStream(_output_path + ".decrypting", FileMode.Open, FileAccess.Read, FileShare.None);
var identifier = fs.ReadByte(); //读取文件首字节判断加密类型
fs.Close();
if (identifier == FileEncrypt.FLG_DYNAMIC_KEY && _key_manager.HasRsaKey)
{
try
{
//解密文件并删除加密文件
FileEncrypt.DecryptFile(_output_path + ".decrypting", _output_path, _key_manager.RSAPrivateKey);
File.Delete(_output_path + ".decrypting");
}
catch
{
//出错后取消解密，将文件重新命名
File.Move(_output_path + ".decrypting", _output_path);
}
}
else if (identifier == FileEncrypt.FLG_STATIC_KEY && _key_manager.HasAesKey)
{
try
{
FileEncrypt.DecryptFile(_output_path + ".decrypting", _output_path, _key_manager.AESKey, _key_manager.AESIV);
File.Delete(_output_path + ".decrypting");
}
catch
{
File.Move(_output_path + ".decrypting", _output_path);
}
}
else
{
//加密类型不匹配，重新命名
File.Move(_output_path + ".decrypting", _output_path);
}
}
catch (Exception ex)
{
Tracer.GlobalTracer.TraceError(ex);
}
}
private void btnDecrypt_Click(object sender, EventArgs e)
{
#region 验证
if (txtPwd.Text == "")
{
MessageBox.Show("密码不能为空", "提示");
return;
}
#endregion
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
Thread thread = new Thread(new ParameterizedThreadStart(delegate(object obj)
{
try
{
InvokeDelegate invokeDelegate = delegate()
{
pbFile.Value = 0;
lblProgressFile.Text = "0%";
pbDir.Visible = false;
lblProgressDir.Visible = false;
pbFile.Visible = false;
lblProgressFile.Visible = false;
lblShowPath.Text = "解密文件：" + openFileDialog1.FileName;
lblShowPath.Visible = true;
DisableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
DateTime t1 = DateTime.Now;
FileEncrypt.DecryptFile(openFileDialog1.FileName, txtPwd.Text, RefreshFileProgress);
DateTime t2 = DateTime.Now;
string t = t2.Subtract(t1).TotalSeconds.ToString("0.00");
if (MessageBox.Show("解密成功，耗时" + t + "秒", "提示") == DialogResult.OK)
{
invokeDelegate = delegate()
{
EnableBtns();
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
catch (Exception ex)
{
if (MessageBox.Show("解密失败：" + ex.Message, "提示") == DialogResult.OK)
{
InvokeDelegate invokeDelegate = delegate()
{
EnableBtns();
tryCount++;
if (tryCount == maxTryCount)
{
this.Close();
}
};
InvokeUtil.Invoke(this, invokeDelegate);
}
}
}));
thread.Start();
}
}