[C++, C#, VB.NET, PowerShell] Read MSDM license information from BIOS ACPI tables

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Did i get the .net coders started in the right direction?

 

nope i didnt have a windows 8 pc till now and as far as i know it just dumped the table and nothing more

 

Tested

This one works - just corrected some small typos - have tested on W8:

C#:

Code:

 

        [DllImport("kernel32")]
        public static extern uint EnumSystemFirmwareTables(uint FirmwareTableProviderSignature, IntPtr pFirmwareTableBuffer, uint BufferSize);
        [DllImport("kernel32")]
        private static extern uint GetSystemFirmwareTable(uint FirmwareTableProviderSignature, uint FirmwareTableID, IntPtr pFirmwareTableBuffer, uint BufferSize);        /// <summary>
        /// Get the OEM:DM Product Key from the System Firmware MSDM Table
        /// </summary>
        /// <returns>List of all discovered Product Keys</returns>
        public static List<string> GetKeysFromMSDMWindows(ref byte[] buffer)
        {
            List<string> detectedKeys = new List<string>();
            // Read System Firmware
            uint firmwareTableProviderSignature = 0x41435049; // 'ACPI' in Hexadecimal
            uint bufferSize = EnumSystemFirmwareTables(firmwareTableProviderSignature, IntPtr.Zero, 0);
            IntPtr pFirmwareTableBuffer = Marshal.AllocHGlobal((int)bufferSize);
            buffer = new byte[bufferSize];
            EnumSystemFirmwareTables(firmwareTableProviderSignature, pFirmwareTableBuffer, bufferSize);
            Marshal.Copy(pFirmwareTableBuffer, buffer, 0, buffer.Length);
            Marshal.FreeHGlobal(pFirmwareTableBuffer);
            // Check for MSDM Table
            if (Encoding.ASCII.GetString(buffer).Contains("MSDM"))
            {
                // Get MSDM Table
                uint firmwareTableID = 0x4d44534d; // Reversed 'MSDM' in Hexadecimal
                bufferSize = GetSystemFirmwareTable(firmwareTableProviderSignature, firmwareTableID, IntPtr.Zero, 0);
                buffer = new byte[bufferSize];
                pFirmwareTableBuffer = Marshal.AllocHGlobal((int)bufferSize);
                GetSystemFirmwareTable(firmwareTableProviderSignature, firmwareTableID, pFirmwareTableBuffer, bufferSize);
                Marshal.Copy(pFirmwareTableBuffer, buffer, 0, buffer.Length);
                Marshal.FreeHGlobal(pFirmwareTableBuffer);
                // Get OEM:DM Key
                Encoding encoding = Encoding.GetEncoding(0x4e4);
                detectedKeys.Add(encoding.GetString(buffer, 56, 29));
            }
            return detectedKeys;
        }
        public static void ShowMe()
        {
            byte[] buffer = null;
            if (GetKeysFromMSDMWindows(ref buffer) != null)
            {
                Encoding encoding = Encoding.GetEncoding(0x4e4);
                string signature = encoding.GetString(buffer, 0x0, 0x4);
                int length = BitConverter.ToInt32(buffer, 0x4);
                byte revision = (byte)buffer.GetValue(0x8);
                byte checksum = (Byte)buffer.GetValue(0x9);
                string oemid = encoding.GetString(buffer, 0xa, 0x6);
                string oemtableid = encoding.GetString(buffer, 0x10, 0x8);
                int oemrev = BitConverter.ToInt32(buffer, 0x18);
                string creatorid = encoding.GetString(buffer, 0x1c, 0x4);
                int creatorrev = BitConverter.ToInt32(buffer, 0x20);
                int sls_version = BitConverter.ToInt32(buffer, 0x24);
                int sls_reserved = BitConverter.ToInt32(buffer, 0x28);
                int sls_datatype = BitConverter.ToInt32(buffer, 0x2C);
                int sls_datareserved = BitConverter.ToInt32(buffer, 0x30);
                int sls_datalength = BitConverter.ToInt32(buffer, 0x34);
                string sls_data = encoding.GetString(buffer, 0x38, sls_datalength);
                string result = "Signature         : " + signature +
                    "\nLength            : " + length +
                    "\nRevison           : " + revision.ToString("X") +
                    "\nChecksum          : " + checksum.ToString("X") +
                    "\nOEM ID            : " + oemid +
                    "\nOEM Table ID      : " + oemtableid +
                    "\nOEM Revision      : " + oemrev +
                    "\nCreator ID        : " + creatorid +
                    "\nCreator Revision  : " + creatorrev +
                    "\nSLS Version       : " + sls_version +
                    "\nSLS Reserved      : " + sls_reserved +
                    "\nSLS Datatype      : " + sls_datatype +
                    "\nSLS Data Reserved : " + sls_datareserved +
                    "\nSLS Data Length   : " + sls_datalength +
                    "\nKey               : " + sls_data;
                Console.WriteLine(result);
            }
            else
            {
                Console.WriteLine("MSDM Table Not Found!");
            }
            Console.ReadKey();
        }