public override ECLookupTable CreateCacheSafeLookupTable(ECPoint[] points, int off, int len)
        {
            uint[] table = new uint[len * SECP256R1_FE_INTS * 2];
            {
                int pos = 0;
                for (int i = 0; i < len; ++i)
                {
                    ECPoint p = points[off + i];
                    Nat256.Copy(((SecP256R1FieldElement)p.RawXCoord).x, 0, table, pos); pos += SECP256R1_FE_INTS;
                    Nat256.Copy(((SecP256R1FieldElement)p.RawYCoord).x, 0, table, pos); pos += SECP256R1_FE_INTS;
                }
            }

            return(new SecP256R1LookupTable(this, table, len));
        }