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internal/ed25519: add addition for Edwards points

This commit is contained in:
Henry de Valence 2019-05-07 22:55:29 -07:00
parent 596a79126e
commit bdc420be66
1 changed files with 20 additions and 0 deletions
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20
internal/edwards25519/edwards25519.go
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@ -138,6 +138,24 @@ func (v *AffineCached) FromP3(p *ProjP3) *AffineCached {
// (Re)addition and subtraction.
func (v *ProjP3) Add(p, q *ProjP3) *ProjP3 {
result := ProjP1xP1{}
qCached := ProjCached{}
qCached.FromP3(q)
result.Add(p, &qCached)
v.FromP1xP1(&result)
return v
}
func (v *ProjP3) Sub(p, q *ProjP3) *ProjP3 {
result := ProjP1xP1{}
qCached := ProjCached{}
qCached.FromP3(q)
result.Sub(p, &qCached)
v.FromP1xP1(&result)
return v
}
func (v *ProjP1xP1) Add(p *ProjP3, q *ProjCached) *ProjP1xP1 {
var YplusX, YminusX, PP, MM, TT2d, ZZ2 radix51.FieldElement
@ -236,6 +254,8 @@ func (v *ProjP1xP1) Double(p *ProjP2) *ProjP1xP1 {
return v
}
// Negation.
func (v *ProjP3) Neg(p *ProjP3) *ProjP3 {
v.X.Neg(&p.X)
v.Y.Set(&p.Y)