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Posted 21 Aug 2006


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Extract Window Product Key - With an API !

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3.07/5 (8 votes)
21 Aug 2006
Get a window's product key!


Hi. This article shows a very usuful function!! This function gets a window's product key using the Windows API that can used with any window and can be used with any tool and language, VB, C++, VS6, VS 7, 8, and so on.

The code

BSTR GetProductKey()
 Window Product Key Extract

 CString strResult;        //Return a Window Product Key
 HKEY hRegistryKey;        //Registry Handler 
 BYTE   *DigitalProductID; //Digital Product Key Value 
 DWORD DataLength;         //Digital Product Key Length 

 BYTE ProductKeyExtract [15]; //Extract Key 

char sCDKey  [256];   //Temp, adding a Window Product Key
 long ByteCounter;    //Counter
 long ByteConvert;    //Convert

 int  nCur;      //XOR calculate 

 char *KeyChars[] = {

 // HKLM\\SOFTWARE\\MICROSOFT\\Windows NT\\CurrentVersion 열기  
    &hRegistryKey) == ERROR_SUCCESS)
  DataLength = 164; 

  //Allocate Memory
  DigitalProductID = (BYTE *)malloc(DataLength);    

  //Memory Initializationd
  memset(DigitalProductID, 0, DataLength); 

 //Digital Product Key Open

  if(RegQueryValueEx(hRegistryKey, "DigitalProductId", 
   NULL, NULL, DigitalProductID, &DataLength) == ERROR_SUCCESS)
   //reading a value start position 52, by 66
   for(ByteCounter=52; ByteCounter<=66; ByteCounter++)
    ProductKeyExtract[ByteCounter - 52] = 

   //Last Indexer
   ProductKeyExtract[sizeof(ProductKeyExtract)] = NULL;

 //Start Converting job, Next Step 

 memset(sCDKey, 0, sizeof(sCDKey)); 

 for(ByteCounter=24; ByteCounter>=0; ByteCounter--)
  nCur = 0; 

  for(ByteConvert=14; ByteConvert>=0; ByteConvert--)

   nCur = (nCur * 256) ^ ProductKeyExtract[ByteConvert];  //XOR계산 
   ProductKeyExtract[ByteConvert] = nCur / 24;
   nCur = nCur % 24;
  strcat(sCDKey, KeyChars[nCur]);

  //Insert "-" 

  if(!(ByteCounter % 5) && (ByteCounter))
   strcat(sCDKey, "-"); 

 //Insert Product Key into Return value 

 strResult.Format("%s", sCDKey); 

 //Close Registry

 //Release Memory
 if(DigitalProductID) free(DigitalProductID); 

 return strResult.AllocSysString();

If you have any questions, mail them to me!


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Written By
United States United States
Yeah, I'm programmer in SEOUL, Korea.

Comments and Discussions

Questionwin10 Pin
yht790590731-Jul-18 21:37
Memberyht790590731-Jul-18 21:37 
QuestionCouple serious bugs in this Pin
pickaname26-Nov-13 11:20
Memberpickaname26-Nov-13 11:20 
AnswerRe: Couple serious bugs in this Pin
handsomeme8-Apr-14 2:01
Memberhandsomeme8-Apr-14 2:01 
GeneralWork version is here [modified] Pin
dima_kdl30-Jan-09 7:03
Memberdima_kdl30-Jan-09 7:03 
GeneralRe: Work version is here Pin
tttony0725-Aug-09 17:36
Membertttony0725-Aug-09 17:36 
AnswerRe: Work version is here Pin
danielsage6-Feb-11 11:07
Memberdanielsage6-Feb-11 11:07 
GeneralRe: Work version is here Pin
tttony076-Feb-11 14:46
Membertttony076-Feb-11 14:46 
GeneralC# & VB.NET Code Pin
crouchie044-Apr-07 5:46
Membercrouchie044-Apr-07 5:46 
GeneralNice code Pin
Douglas R. Keesler6-Jan-07 20:15
MemberDouglas R. Keesler6-Jan-07 20:15 
GeneralSmall bug Pin
mcanti6-Jan-07 3:42
Membermcanti6-Jan-07 3:42 
GeneralRe: Small bug Pin
sstraw17-Oct-07 12:21
Membersstraw17-Oct-07 12:21 
GeneralWindows Vista Pin
Gabriel Topala16-Sep-06 17:14
MemberGabriel Topala16-Sep-06 17:14 
GeneralRe: Windows Vista Pin
handsomeme17-Sep-06 16:59
Memberhandsomeme17-Sep-06 16:59 
GeneralRe: Windows Vista Pin
tzukuei18-Oct-06 0:49
Membertzukuei18-Oct-06 0:49 
GeneralRe: Windows Vista Pin
Gabriel Topala18-Oct-06 1:35
MemberGabriel Topala18-Oct-06 1:35 
GeneralRe: Windows Vista Pin
tzukuei18-Oct-06 17:10
Membertzukuei18-Oct-06 17:10 
GeneralRe: Windows Vista Pin
Gabriel Topala18-Oct-06 18:00
MemberGabriel Topala18-Oct-06 18:00 
GeneralRe: Windows Vista [modified] Pin
tzukuei19-Oct-06 16:33
Membertzukuei19-Oct-06 16:33 
GeneralRe: Windows Vista Pin
awjapp21-Apr-07 7:34
Memberawjapp21-Apr-07 7:34 
GeneralSolo Pin
hvw22-Aug-06 19:13
Memberhvw22-Aug-06 19:13 
GeneralWow Good C# I like C# and used this! Pin
handsomeme22-Aug-06 14:38
Memberhandsomeme22-Aug-06 14:38 
Generalin c# Pin
solo22-Aug-06 6:17
Membersolo22-Aug-06 6:17 
GeneralRe: in c#, not work! Pin
W4Rl0CK477-Nov-09 1:56
MemberW4Rl0CK477-Nov-09 1:56 

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