public unsafe static int EC_POINT_point2oct(EC_GROUP group, EC_POINT point, EC_POINT_CONVERSION form, Span <byte> output)
{
var size = EC_POINT_point2oct(group, point, form, null, IntPtr.Zero, IntPtr.Zero);
if (size.ToInt32() > output.Length)
{
throw new ArgumentOutOfRangeException(nameof(output));
}
ThrowOnError(size);
fixed(void *outputPtr = &output.DangerousGetPinnableReference())
{
size = EC_POINT_point2oct(group, point, form, outputPtr, (IntPtr)output.Length, IntPtr.Zero);
ThrowOnError(size);
return(size.ToInt32());
}
}
private static extern unsafe IntPtr EC_POINT_point2oct(EC_GROUP group, EC_POINT p, EC_POINT_CONVERSION form, void *buf, IntPtr len, IntPtr ctx);