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internal/group: rename to internal/edwards25519

This commit is contained in:
Filippo Valsorda 2019-04-19 12:22:32 -04:00 committed by George Tankersley
parent 7f2b08f212
commit 88aa823cd0
2 changed files with 9 additions and 9 deletions
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4
internal/group/ge.go → internal/edwards25519/edwards25519.go
View File

@ -3,13 +3,13 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package group implements group logic for the twisted Edwards curve
// Package edwards25519 implements group logic for the twisted Edwards curve
//
// -x^2 + y^2 = 1 + -(121665/121666)*x^2*y^2
//
// This is better known as the Edwards curve equivalent to curve25519, and is
// the curve used by the Ed25519 signature scheme.
package group
package edwards25519
import (
"math/big"

14
ristretto255.go
View File

@ -8,7 +8,7 @@
package ristretto255
import (
"github.com/gtank/ristretto255/internal/group"
"github.com/gtank/ristretto255/internal/edwards25519"
"github.com/gtank/ristretto255/internal/radix51"
)
@ -27,7 +27,7 @@ var (
// Element is an element of the ristretto255 prime-order group.
type Element struct {
r group.ExtendedGroupElement
r edwards25519.ExtendedGroupElement
}
// Equal returns 1 if e is equivalent to ee, and 0 otherwise.
@ -57,18 +57,18 @@ func (e *Element) FromUniformBytes(b []byte) {
f := &radix51.FieldElement{}
f.FromBytes(b[:32])
p1 := &group.ExtendedGroupElement{}
p1 := &edwards25519.ExtendedGroupElement{}
mapToPoint(p1, f)
f.FromBytes(b[32:])
p2 := &group.ExtendedGroupElement{}
p2 := &edwards25519.ExtendedGroupElement{}
mapToPoint(p2, f)
e.r.Add(p1, p2)
}
// mapToPoint implements MAP from Section 3.2.4 of draft-hdevalence-cfrg-ristretto-00.
func mapToPoint(out *group.ExtendedGroupElement, t *radix51.FieldElement) {
func mapToPoint(out *edwards25519.ExtendedGroupElement, t *radix51.FieldElement) {
// r = SQRT_M1 * t^2
r := &radix51.FieldElement{}
r.Mul(sqrtM1, r.Square(t))
@ -83,9 +83,9 @@ func mapToPoint(out *group.ExtendedGroupElement, t *radix51.FieldElement) {
// v = (c - r*D) * (r + D)
rPlusD := &radix51.FieldElement{}
rPlusD.Add(r, group.D)
rPlusD.Add(r, edwards25519.D)
v := &radix51.FieldElement{}
v.Mul(v.Sub(c, v.Mul(r, group.D)), rPlusD)
v.Mul(v.Sub(c, v.Mul(r, edwards25519.D)), rPlusD)
// (was_square, s) = SQRT_RATIO_M1(u, v)
s := &radix51.FieldElement{}