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Ever needed to reinstall your PC and could not recover your product key from that 'safe storage' you were supposed to use? It is no secret that if your system is still running you can recover the key from the system registry where it is encoded in a REG_BINARY value.

You can download a free utility that recovers the XP product key (and the MS Office product key if its installed):

You can even recover it online here:

but if you're paranoid, maybe these applications are actually stealing your product key, so you want to do this yourself with your own code, right?  The only bit of code I could find that can recover product keys is here:

which provides a working Delphi source-code listing. I only required to find the XP product key, so after hacking the code, I produced a working C# version (works with .NET 1.1 and 2.0) shown below. I allowed place-holders for other product keys but the code may have to be further modified to work correctly.

 

Windows XP KeyFinder Listing
using System;
using System.Collections;
using Microsoft.Win32;

namespace MSKeyFinder
{
  public class KeyDecoder
  {
    public enum Key { XP, Office10, Office11 };
    public static byte[] GetRegistryDigitalProductId(Key key)
    {
      byte[] digitalProductId = null;
      RegistryKey registry = null;
      switch(key)
      {
        // Open the XP subkey readonly.
        case Key.XP:
          registry = 
            Registry.LocalMachine.
              OpenSubKey(
                @"SOFTWARE\Microsoft\Windows NT\CurrentVersion",
                  false);
          break;
        // Open the Office 10 subkey readonly.
        case Key.Office10:
          // TODO: Open the registry key.
          break;
        // Open the Office 11 subkey readonly.
        case Key.Office11:
          // TODO: Open the registry key.
          break;
      }
      if(registry != null)
      {
        // TODO: For other products, key name maybe different.
        digitalProductId = registry.GetValue("DigitalProductId")
          as byte[];
        registry.Close();
      }
      return digitalProductId;
    }
    public static string DecodeProductKey(byte[] digitalProductId)
    {
      // Offset of first byte of encoded product key in 
      //  'DigitalProductIdxxx" REG_BINARY value. Offset = 34H.
      const int keyStartIndex = 52;
      // Offset of last byte of encoded product key in 
      //  'DigitalProductIdxxx" REG_BINARY value. Offset = 43H.
      const int keyEndIndex = keyStartIndex + 15;
      // Possible alpha-numeric characters in product key.
      char[] digits = new char[]
      {
        'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'M', 'P', 'Q', 'R', 
        'T', 'V', 'W', 'X', 'Y', '2', '3', '4', '6', '7', '8', '9',
      };
      // Length of decoded product key
      const int decodeLength = 29;
      // Length of decoded product key in byte-form.
      // Each byte represents 2 chars.
      const int decodeStringLength = 15;
      // Array of containing the decoded product key.
      char[] decodedChars = new char[decodeLength];
      // Extract byte 52 to 67 inclusive.
      ArrayList hexPid = new ArrayList();
      for (int i = keyStartIndex; i <= keyEndIndex; i++)
      {
        hexPid.Add(digitalProductId[i]);
      }
      for (int i = decodeLength - 1; i >= 0; i--)
      {
        // Every sixth char is a separator.
        if ((i + 1) % 6 == 0)
        {
          decodedChars[i] = '-';
        }
        else
        {
          // Do the actual decoding.
          int digitMapIndex = 0;
          for (int j = decodeStringLength - 1; j >= 0; j--)
          {
            int byteValue = (digitMapIndex << 8) | (byte)hexPid[j];
            hexPid[j] = (byte)(byteValue / 24);
            digitMapIndex = byteValue % 24;
            decodedChars[i] = digits[digitMapIndex];
          }
        }
      }
      return new string(decodedChars);
    }
  }
}

Once you realize how the product keys are encoded, a search through the registry for the values starting with DigitalProductId indicates that many more product keys may be encoded this way.

PLEASE NOTE: All code listed here is provided as-is, with no guarantees what so ever. Use of this code does not require a license and no copyright on the code exists or is implied. You are free to use the code as you see fit, for any commercial or non-commercial use.

Posted on Sunday, April 23, 2006 9:37 AM .NET Adventures | Back to top


Comments on this post: Recover your XP product key from the registry using C#

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Left by Anonymous on May 19, 2006 6:20 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
how do I call the function to get the final String to be showed at a txt box ?

Left by Mike Cobain on Oct 28, 2006 11:18 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Any ideas on reversing the process? I have a bunch of machines at work that I need to rekey Office for (the same decode algorithm works for Office keys)
Left by slide on Nov 02, 2006 1:16 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
I guess you could hack the registry directly but considering the dire warnings MS gives about this, I would suggest using some VB scripts that change the product key using WMI. Check out the following link:

http://support.microsoft.com/kb/328874

It should be possible to also do this using C# by utilizing the classes of the System.Management namespace. Check on Google for the key-words C# and WMI...
Left by Willem on Nov 06, 2006 1:23 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Wow, Very impressive... i had to add a Main method (obviously) but it definitely worked,

Thank you sir!
Left by Derek Flournoy on Apr 20, 2007 7:56 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
for those of you who have not figured out how to actually make this work....

byte[] results =KeyDecoder.GetRegistryDigitalProductId(KeyDecoder.Key.XP);

textBox1.Text = KeyDecoder.DecodeProductKey(results);


Left by sysguru on Aug 06, 2007 6:14 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Does not work with 64-bit editions of Windows due to Registry reflection/mirroring
Left by Socrates on Aug 09, 2007 2:22 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Did not work for me.
I have an older version of XP Home, it came with only SP1.

Worked on Vista though
Left by CU-420 on Aug 13, 2007 7:44 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
I can use it to "偷" ProductKey
Left by Thanks on Nov 09, 2007 5:51 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
I have used this software on OEM and retail versions of Windows Pro x64 (not Itanium) and it works fine. Socrates may have tried it on an Itanium OS or a mass produced OEM version like Dell would distribute. Anyway it works fine.
Left by Paul on Nov 23, 2007 3:44 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
use WinGuggle

You can use this application to get your Windows Vista Product key easily.

It Provides Complete Way to Brand your PC/Laptop:
like add information to Windows experience index page, system properties page and owners information info. WOW! Great Tool…

Download Here: WinGuggle
http://unlockforus.blogspot.com/2008/01/winguggle-get-your-windows-vista.html

Left by Goody on Feb 01, 2008 11:04 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Download Here:
Left by Goody on Feb 01, 2008 11:06 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
So how about a method to encode a human readable product key into a digitalproductID?
Left by Big Mike on Mar 14, 2008 12:19 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
This code is great and you've been kind enough to put it online for all to see! However (if you're in the USA), you have not specified a copyright for it, so as a result you have automatic rights and no one else is allowed to use it without your permission. If you read the codinghorror blog post here http://www.codinghorror.com/blog/archives/000833.html you can see what problems this can cause.

It would be great if you could specify a copyright so the many who have received some benefit from it can use it. Even though I've seen it reposted on many other sites by now, I'm pretty sure yours is the original. Based on your comments above, it seems like Public Domain might be the best license for your intentions, but take a look at that Coding Horror post and maybe something else will jump out at you.
Left by brian on Jul 10, 2008 10:13 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Excellent code works great but have experienced problems with Dell PC's. Got this from a technet post:

---------------------------------------
What Dell does is:
Create an install with a single KEY that is preactivated. The Key is provided in the winnt.sif file in the sysprep directory so the end user is not even prompted for it.

The end user never sees a prompt to enter a CD Key. Nor does the user need to activate.

The Dell XP CD's have the following characteristics:
1. No CD Key is needed to install
2. They do a BIOS Check so that they can only be installed on a DELL Computer.
3. If you reinstall from the CD, you will need to activate. If you try, it will fail and prompt you to re-enter a valid Key. Simply enter the Key from the COA sticker and you can activate.

The implications are profound. This means that as long as you do not reinstall windows on your original Dell hardware, your OEM key will activate on any new motherboard you might install.

---------------------------------------

Therefore all the keys are the same and will not match the sticker on the Dell case. Shame, would have been nice to use this to audit all PC's.
Left by stuart on Oct 01, 2008 10:00 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
counter strike source
Left by devin on Jan 10, 2009 4:45 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Perfect! Exactly what I needed in order to keep from borking my licensing. Next time I'll track better what keys I applied to what machine.
Left by Duke on Mar 14, 2009 5:38 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
need my register key for driver detective
Left by elias on May 02, 2009 1:21 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
I need a code to encrypt 25-digit-character to byte[] format before decrypting the byte[] into string.
Left by Naresh on Nov 21, 2009 5:40 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Works in Windows 7 also
Left by Richard on Dec 29, 2009 10:42 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
At times I have a need to recover a COA Product Key from a Hard Drive that will not boot...and the COA sticker is either gone or unreadable-as in those stuck on the bottom surface of a laptop and worn beyond recognition. Usually necessary to have the customer purchase a new copy of XP for no real reason. I have been unable to find a method to do this and am looking to see if anyone here knows.
Thanks
Left by Bob on Jan 12, 2010 5:47 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
There is this Winkeyfinder also http://www.winkeyfinder.com/
Left by Muhammad on Feb 22, 2010 3:00 AM

# re: Recover your XP product key from the registry using C#
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you are great!!! :-D thanks
Left by evilripper on Mar 04, 2010 5:44 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
I reversed the algorithm to encode the DPID.

http://pastebin.com/0nrhNH7K
Left by MrGneissGuy on Mar 10, 2010 3:23 AM

# re: Recover your XP product key from the registry using C#

# re: Recover your XP product key from the registry using C#

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Wholesale cheap Microsoft Windows 7 office 2010 office 2007 product CD key

Wholesale cheap Microsoft Windows 7 office 2010 office 2007 product CD key
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# Wholesale cheap Microsoft Windows 7 office 2010 office 2007 product CD key
Requesting Gravatar...
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# a good website selling windows, office
Requesting Gravatar...
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The key only works with the final retail versions of Windows 7 and office The page URL is: http://www.onlinekey.org

According to users who have bought works perfectly , and the complete Windows passes validation Windows Genuine Advantage.
Left by tjacky on Jul 25, 2010 9:46 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
very good explain, I can know all the mean.
Left by ac adapter on Aug 02, 2010 5:09 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Today surfing the web I found a site selling original windows 7 key www.windows7serial.net
at $ 9.99 , the price is very economical . It also has other licenses also very economical.

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According to users who have bought works perfectly , and the complete Windows passes validation Windows Genuine Advantage.
Left by windows 7 serial only 9.99usd on Aug 14, 2010 2:21 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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Left by salekey on Aug 14, 2010 9:03 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
There’s also a software that does this at http://www.windows-key-finder.com/ The advantage is that it can even find out your Windows system CD Key when your Windows can't startup.Also, This software will find many other keys like office XP, office 2007 and more .
You can have a try.
Hope this can help you!
Best wishes!
Left by Greg Parks on Aug 22, 2010 4:19 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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# re: Recover your XP product key from the registry using C#
Requesting Gravatar...

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# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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Left by beck on Nov 17, 2010 2:45 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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Left by dan on Nov 30, 2010 7:45 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
thank you for sharing with us
Left by Dell OptiPlex SX260 CD-RW/DVD Co on Dec 01, 2010 7:48 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
I usually use this product key finder program - http://www.top-password.com/product-key-finder.html
It works well on my computer.
Left by Mark on Dec 07, 2010 2:05 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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Left by Sandy on Jan 02, 2011 4:04 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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The key only works with the final retail versions of Windows 7 and office The page URL is: www.windowsmart.net
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# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
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Left by tiffany jewelry co on Jan 14, 2011 4:01 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
All these tinny details are made with lot of background knowledge. I like it a lot.
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# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
Thanks for your useful tip!
Left by Recover Product Key on Jun 28, 2011 10:14 AM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
{
// Do the actual decoding.
int digitMapIndex = 0;
for (int j = decodeStringLength - 1; j >= 0; j--)
{
int byteValue = (digitMapIndex << 8) | (byte)hexPid[j];
hexPid[j] = (byte)(byteValue / 24);
digitMapIndex = byteValue % 24;
}
decodedChars[i] = digits[digitMapIndex];

}
Left by Tomasz Karlinski on Jul 09, 2011 8:31 AM

# re: Recover your XP product key from the registry using vb .net
Requesting Gravatar...
here is vb .net version. I compiled it and it works - produces some key (for office 2007) but I had no chance to test if it actually works:

Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

Dim reg1 As Microsoft.Win32.RegistryKey

reg1 = Microsoft.Win32.Registry.LocalMachine.OpenSubKey("SOFTWARE\Microsoft\Office\12.0\Registration\{91120000-0031-0000-0000-0000000FF1CE}", False)

Dim digitalProductId As Byte()
digitalProductId = reg1.GetValue("DigitalProductId")

Dim res As String = decode(digitalProductId)
Clipboard.SetDataObject(res)
MsgBox(res)
End Sub

Function decode(ByRef digitalProductId() As Byte) As String
Dim keyStartIndex As Integer = 52
Dim keyEndIndex As Integer = keyStartIndex + 15


Dim digits() As Char = {"B", "C", "D", "F", "G", "H", "J", "K", "M", "P", "Q", "R", _
"T", "V", "W", "X", "Y", "2", "3", "4", "6", "7", "8", "9"}

' Length of decoded product key
Dim decodeLength As Integer = 29

' Length of decoded product key in byte-form.
' Each byte represents 2 chars.
Dim decodeStringLength As Integer = 15
' Array of containing the decoded product key.
Dim decodedChars(decodeLength) As Char
' Extract byte 52 to 67 inclusive.
Dim HEXPID As New ArrayList

For i As Integer = keyStartIndex To keyEndIndex
HEXPID.Add(digitalProductId(i))
Next

For i As Integer = decodeLength - 1 To 0 Step -1

' Every sixth char is a separator.
If ((i + 1) Mod 6 = 0) Then
decodedChars(i) = "-"
Else

' Do the actual decoding.
Dim digitMapIndex As Integer = 0
For j As Integer = decodeStringLength - 1 To 0 Step -1
Dim byteValue As Integer = (digitMapIndex << 8) Or HEXPID(j)
HEXPID(j) = byteValue \ 24

digitMapIndex = byteValue Mod 24

decodedChars(i) = digits(digitMapIndex)

Next
End If

Next
Return New String(decodedChars)
End Function
End Class



Left by Franjo on Aug 14, 2011 9:42 PM

# re: Recover your XP product key from the registry using C#
Requesting Gravatar...
How interesting it is to see a post of 2006 can still get replies in 2011. Now I want to extend it to 2012 , LOL
Anyway ,excellent post which is surely to help me in the future.
Left by DHgate on Aug 09, 2012 4:11 AM

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