/
curve.go
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/
curve.go
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// Copyright 2020 Consensys Software Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Code generated by consensys/gnark-crypto DO NOT EDIT
package twistededwards
import (
"math/big"
"sync"
"github.com/consensys/gnark-crypto/ecc/bn254/fr"
)
// CurveParams curve parameters: ax^2 + y^2 = 1 + d*x^2*y^2
type CurveParams struct {
A, D fr.Element
Cofactor fr.Element
Order big.Int
Base PointAffine
}
// GetEdwardsCurve returns the twisted Edwards curve on bn254/Fr
func GetEdwardsCurve() CurveParams {
initOnce.Do(initCurveParams)
// copy to keep Order private
var res CurveParams
res.A.Set(&curveParams.A)
res.D.Set(&curveParams.D)
res.Cofactor.Set(&curveParams.Cofactor)
res.Order.Set(&curveParams.Order)
res.Base.Set(&curveParams.Base)
return res
}
var (
initOnce sync.Once
curveParams CurveParams
)
func initCurveParams() {
curveParams.A.SetString("-1")
curveParams.D.SetString("12181644023421730124874158521699555681764249180949974110617291017600649128846")
curveParams.Cofactor.SetString("8")
curveParams.Order.SetString("2736030358979909402780800718157159386076813972158567259200215660948447373041", 10)
curveParams.Base.X.SetString("9671717474070082183213120605117400219616337014328744928644933853176787189663")
curveParams.Base.Y.SetString("16950150798460657717958625567821834550301663161624707787222815936182638968203")
}
// mulByA multiplies fr.Element by curveParams.A
func mulByA(x *fr.Element) {
x.Neg(x)
}