mirror of https://github.com/gtank/ristretto255
internal/ed25519: add tests for multi-model point types.
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@ -107,6 +107,14 @@ func (v *ProjP3) FromP1xP1(p *ProjP1xP1) *ProjP3 {
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return v
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}
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func (v *ProjP3) FromP2(p *ProjP2) *ProjP3 {
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v.X.Mul(&p.X, &p.Z)
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v.Y.Mul(&p.Y, &p.Z)
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v.Z.Square(&p.Z)
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v.T.Mul(&p.X, &p.Y)
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return v
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}
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func (v *ProjCached) FromP3(p *ProjP3) *ProjCached {
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v.YplusX.Add(&p.Y, &p.X)
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v.YminusX.Sub(&p.Y, &p.X)
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@ -232,6 +240,26 @@ func (v *ProjP1xP1) Double(p *ProjP2) *ProjP1xP1 {
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return v
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}
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func (v *ProjP3) Neg(p *ProjP3) *ProjP3 {
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v.X.Neg(&p.X)
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v.Y.Set(&p.Y)
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v.Z.Set(&p.Z)
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v.T.Neg(&p.T)
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return v
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}
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// by @ebfull
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// https://github.com/dalek-cryptography/curve25519-dalek/pull/226/files
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func (v *ProjP3) Equal(u *ProjP3) int {
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var t1, t2, t3, t4 radix51.FieldElement
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t1.Mul(&v.X, &u.Z)
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t2.Mul(&u.X, &v.Z)
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t3.Mul(&v.Y, &u.Z)
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t4.Mul(&u.Y, &v.Z)
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return t1.Equal(&t2) & t3.Equal(&t4)
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}
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// From EFD https://hyperelliptic.org/EFD/g1p/auto-twisted-extended-1.html
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// An elliptic curve in twisted Edwards form has parameters a, d and coordinates
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// x, y satisfying the following equations:
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@ -36,3 +36,49 @@ func TestAddSubNegOnBasePoint(t *testing.T) {
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t.Error("B + (-B) != 0")
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}
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}
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func TestAddSubNegOnBasePoint2(t *testing.T) {
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var B, Bneg ProjP3
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var tmpP2 ProjP2
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var tmpP1xP1 ProjP1xP1
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var tmpCached ProjCached
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B = ProjP3{
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X: radix51.FieldElement([5]uint64{426475514619346, 2063872706840040, 14628272888959, 107677749330612, 288339085807592}),
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Y: radix51.FieldElement([5]uint64{1934594822876571, 2049809580636559, 1991994783322914, 1758681962032007, 380046701118659}),
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Z: radix51.FieldElement([5]uint64{1, 0, 0, 0, 0}),
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T: radix51.FieldElement([5]uint64{410445769351754, 2235400917701188, 1495825632738689, 1351628537510093, 430502003771208}),
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}
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Bneg.Neg(&B)
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var checkLhs, checkRhs, zero ProjP3
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zero.Zero()
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tmpCached.FromP3(&B)
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tmpP1xP1.Add(&B, &tmpCached)
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checkLhs.FromP1xP1(&tmpP1xP1)
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tmpP2.FromP3(&B)
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tmpP1xP1.Double(&tmpP2)
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checkRhs.FromP1xP1(&tmpP1xP1)
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if checkLhs.Equal(&checkRhs) != 1 {
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t.Error("B + B != [2]B")
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}
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tmpCached.FromP3(&B)
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tmpP1xP1.Sub(&B, &tmpCached)
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checkLhs.FromP1xP1(&tmpP1xP1)
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tmpCached.FromP3(&Bneg)
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tmpP1xP1.Add(&B, &tmpCached)
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checkRhs.FromP1xP1(&tmpP1xP1)
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if checkLhs.Equal(&checkRhs) != 1 {
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t.Error("B - B != B + (-B)")
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}
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if zero.Equal(&checkLhs) != 1 {
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t.Error("B - B != 0")
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}
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if zero.Equal(&checkRhs) != 1 {
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t.Error("B + (-B) != 0")
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}
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}
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