private NCryptStorageProvider(string name)
{
var result = NCrypt.NCryptOpenStorageProvider(out _handle, name, 0u);
if (result != SECURITY_STATUS.ERROR_SUCCESS)
{
throw new Win32Exception(unchecked ((int)result), "Failed to open the CNG storage provider.");
}
}
public static void WriteStringUni(NCryptHandleBase handle, string propertyName, string value)
{
var ptr = Marshal.StringToHGlobalUni(value);
try
{
if (NCrypt.NCryptSetProperty(handle, propertyName, ptr, (uint)value.Length * 2, 0u) != SECURITY_STATUS.ERROR_SUCCESS)
{
throw new InvalidOperationException("Unable to set property.");
}
}
finally
{
Marshal.FreeHGlobal(ptr);
}
}
public static void WriteInt32(NCryptHandleBase handle, string propertyName, int value)
{
var size = Marshal.SizeOf(typeof(int));
var ptr = Marshal.AllocHGlobal(size);
Marshal.WriteInt32(ptr, value);
try
{
if (NCrypt.NCryptSetProperty(handle, propertyName, ptr, (uint)size, 0u) != SECURITY_STATUS.ERROR_SUCCESS)
{
throw new InvalidOperationException("Unable to set property.");
}
}
finally
{
Marshal.FreeHGlobal(ptr);
}
}
public static T Read <T>(NCryptHandleBase handle, string propertyName, Func <IntPtr, T> convert)
{
var buffer = IntPtr.Zero;
uint size;
if (NCrypt.NCryptGetProperty(handle, propertyName, buffer, 0, out size, 0u) != SECURITY_STATUS.ERROR_SUCCESS)
{
throw new InvalidOperationException("Unable to query property.");
}
buffer = Marshal.AllocHGlobal((int)size);
try
{
if (NCrypt.NCryptGetProperty(handle, propertyName, buffer, size, out size, 0u) != SECURITY_STATUS.ERROR_SUCCESS)
{
throw new InvalidOperationException("Unable to query property.");
}
return(convert(buffer));
}
finally
{
Marshal.FreeHGlobal(buffer);
}
}