dy² + 1 vv := new(field.Element).Multiply(y2, d) vv = vv.Add(vv, feOne) // x = +√(u/v) xx, wasSquare := new(field.Element).SqrtRatio(u, vv) if wasSquare == 0 { return nil, errors.New("edwards25519: invalid point encoding") } // Select the negative square root if the sign bit is set. xxNeg := new(field.Element).Negate(xx) xx = xx.Select(xxNeg, xx, int(x[31]>>7)) v.x.Set(xx) v.y.Set(y) v.z.One() v.t.Multiply(xx, y) // xy = T / Z return v, nil } func copyFieldElement(buf *[32]byte, v *field.Element)...

dy² + 1 vv := new(field.Element).Multiply(y2, d) vv = vv.Add(vv, feOne) // x = +√(u/v) xx, wasSquare := new(field.Element).SqrtRatio(u, vv) if wasSquare == 0 { return nil, errors.New("edwards25519: invalid point encoding") } // Select the negative square root if the sign bit is set. xxNeg := new(field.Element).Negate(xx) xx = xx.Select(xxNeg, xx, int(x[31]>>7)) v.x.Set(xx) v.y.Set(y) v.z.One() v.t.Multiply(xx, y) // xy = T / Z return v, nil } func copyFieldElement(buf *[32]byte, v *field.Element)...