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NewIdentityPoint() func checkOnCurve(t *testing.T, points ...*Point) { t.Helper() for i, p := range points { var XX, YY, ZZ, ZZZZ field.Element XX.Square(&p.x) YY.Square(&p.y) ZZ.Square(&p.z) ZZZZ.Square(&ZZ) // -x² + y² = 1 + dx²y² // -(X/Z)² + (Y/Z)² = 1 + d(X/Z)²(Y/Z)² // (-X² + Y²)/Z² = 1 + (dX²Y²)/Z⁴ // (-X² + Y²)*Z² = Z⁴ + dX²Y² var lhs, rhs field.Element lhs.Subtract(&YY, &XX).Multiply(&lhs, &ZZ) rhs.Multiply(d, &XX).Multiply(&rhs, &YY).Add(&rhs, &ZZZZ) if lhs.Equal(&rhs) != 1 { t.Errorf("X, Y, and Z do...