/// <summary>
/// Gets the decoded Windows product key based on the Windows edition.
/// </summary>
/// <param name="windowsEdition">The Windows edition currently being run.</param>
/// <returns>A string containing the Windows product key.</returns>
public static string GetProductKey(WindowsEditions windowsEdition)
{
byte[] digitalProductId = null;
string results = string.Empty;
try
{
digitalProductId = KeyFinder.GetRegistryDigitalProductId(windowsEdition);
}
catch (Exception ex)
{
results = ex.Message;
}
if (digitalProductId != null)
{
results = KeyFinder.DecodeProductKey(digitalProductId);
}
else
{
results = "Product key could not be retrieved.";
}
return results;
}
/// <summary>
/// Gets the Windows product key from the registry in encoded form.
/// </summary>
/// <param name="windowsEdition">The Windows edition of the system being used.</param>
/// <returns>A byte array containing the value of the encrypted Windows product key.</returns>
private static byte[] GetRegistryDigitalProductId(WindowsEditions windowsEdition)
{
byte[] digitalProductId = null;
string digitalProductIdKeyName = GetDigitalProductIdKeyNameForWindowsEdition(windowsEdition);
RegistryKey registry = Registry.LocalMachine.OpenSubKey(regKeyPath, false);
{
digitalProductId = registry.GetValue(digitalProductIdKeyName) as byte[];
}
registry.Close();
if (digitalProductId == null)
{
uint type;
int bufferSize = 2048;
digitalProductId = new byte[2048];
if (RegOpenKeyEx(hiveKeyLocalMachine, regKeyPath, 0, keyQueryValue | keyWow6464Key, out regKeyHandle) == success)
{
RegQueryValueEx(regKeyHandle, digitalProductIdKeyName, 0, out type, digitalProductId, ref bufferSize);
}
if (RegOpenKeyEx(hiveKeyLocalMachine, regKeyPath, 0, keyQueryValue | keyWow6432Key, out regKeyHandle) == success)
{
RegQueryValueEx(regKeyHandle, digitalProductIdKeyName, 0, out type, digitalProductId, ref bufferSize);
}
}
return digitalProductId;
}
/// <summary>
/// Gets the correct Product ID Key Name in the registry for the specified Windows edition.
/// </summary>
/// <param name="edition">The Windows edition of the system currently in use.</param>
/// <returns>A string containing the correct Digital Product ID Key name.</returns>
private static string GetDigitalProductIdKeyNameForWindowsEdition(WindowsEditions edition)
{
switch (edition)
{
case WindowsEditions.Windows7Professional:
return "DigitalProductId4";
default:
return "DigitalProductId";
}
}
