t.l0 + t.l1*2^51 + t.l2*2^102 + t.l3*2^153 + t.l4*2^204 // // Between operations, all limbs are expected to be lower than 2^52. l0 uint64 l1 uint64 l2 uint64 l3 uint64 l4 uint64 } const maskLow51Bits uint64 = (1 << 51) - 1 var feZero = &Element{0, 0, 0, 0, 0} // Zero sets v = 0, and returns v. func (v *Element) Zero() *Element { *v = *feZero return v } var feOne = &Element{1, 0, 0, 0, 0} // One sets v = 1, and returns v. func (v *Element) One() *Element { *v = *feOne return v } // reduce reduces v...