Windows Product Key还原 CDKey

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion 的"digitalProductId" 作为输入 

void DecodeProductKey(unsigned char * digitalProductId, int dsize)

{

    // 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.

    const char *digits="BCDFGHJKMPQRTVWXY2346789";

    // 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.

    unsigned char * decodedChars = new unsigned char[decodeLength+1];

    

    // Extract byte 52 to 67 inclusive.

    unsigned char * hexPid = new unsigned char[15];

    int n=0;

    int i;

    for (i = keyStartIndex; i <= keyEndIndex; i++)

    {

        hexPid[n]=(digitalProductId[i]);

        n++;

    }

    for (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) | (unsigned char)hexPid[j];

                hexPid[j] = (unsigned char)(byteValue / 24);

                digitMapIndex = byteValue % 24;

                decodedChars[i] = digits[digitMapIndex];

            }

            

        }

    }

    //让字符串正常结束

    decodedChars[decodeLength]=NULL;

    printf("Window 密钥:%s/n",decodedChars);

    delete hexPid;

    delete decodedChars;

}