97 lines
3.3 KiB
C#
97 lines
3.3 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.ComponentModel;
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using System.Security.Cryptography;
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using System.Linq;
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using System.Text;
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namespace RDP_Portal {
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/**
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* By ChipForster
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* https://www.remkoweijnen.nl/blog/2007/10/18/how-rdp-passwords-are-encrypted/
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*/
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class Mstscpw {
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private const int CRYPTPROTECT_UI_FORBIDDEN = 0x1;
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// Wrapper for the NULL handle or pointer.
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static private IntPtr NullPtr = ((IntPtr)((int)(0)));
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// Wrapper for DPAPI CryptProtectData function.
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[DllImport( "crypt32.dll", SetLastError = true,
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CharSet = System.Runtime.InteropServices.CharSet.Auto )]
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private static extern bool CryptProtectData(
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ref DATA_BLOB pPlainText,
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[MarshalAs(UnmanagedType.LPWStr)] string szDescription,
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IntPtr pEntroy,
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IntPtr pReserved,
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IntPtr pPrompt,
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int dwFlags,
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ref DATA_BLOB pCipherText);
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// BLOB structure used to pass data to DPAPI functions.
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[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
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internal struct DATA_BLOB {
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public int cbData;
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public IntPtr pbData;
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}
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private static void InitBLOB(byte[] data, ref DATA_BLOB blob) {
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blob.pbData = Marshal.AllocHGlobal(data.Length);
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if (blob.pbData == IntPtr.Zero)
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throw new Exception( "Unable to allocate buffer for BLOB data." );
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blob.cbData = data.Length;
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Marshal.Copy(data, 0, blob.pbData, data.Length);
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}
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public string encryptpw(string pw) {
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byte[] pwba = Encoding.Unicode.GetBytes(pw);
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DATA_BLOB dataIn = new DATA_BLOB();
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DATA_BLOB dataOut = new DATA_BLOB();
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StringBuilder epwsb = new StringBuilder();
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try {
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try {
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InitBLOB(pwba, ref dataIn);
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} catch (Exception ex) {
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throw new Exception( "Cannot initialize dataIn BLOB.", ex );
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}
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bool success = CryptProtectData(
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ref dataIn,
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"psw",
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NullPtr,
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NullPtr,
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NullPtr,
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CRYPTPROTECT_UI_FORBIDDEN,
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ref dataOut );
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if (!success) {
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int errCode = Marshal.GetLastWin32Error();
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throw new Exception( "CryptProtectData failed.", new Win32Exception(errCode) );
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}
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byte[] epwba = new byte[dataOut.cbData];
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Marshal.Copy(dataOut.pbData, epwba, 0, dataOut.cbData);
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// Convert hex data to hex characters (suitable for a string)
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for (int i = 0; i < dataOut.cbData; i++) {
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epwsb.Append(Convert.ToString(epwba[i], 16).PadLeft(2, '0').ToUpper());
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}
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} catch (Exception ex) {
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throw new Exception( "unable to encrypt data.", ex );
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} finally {
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if (dataIn.pbData != IntPtr.Zero)
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Marshal.FreeHGlobal(dataIn.pbData);
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if (dataOut.pbData != IntPtr.Zero)
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Marshal.FreeHGlobal(dataOut.pbData);
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}
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return epwsb.ToString();
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}
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}
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}
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