neoneo-go/pkg/crypto/elliptic/curves.go

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package elliptic
/*
This file was originally made by vsergeev.
Modifications have been made under the MIT license.
License: MIT
*/
import (
"math/big"
)
var curve Curve
type curveType string
const (
// Secp256r1 curve type
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Secp256r1 curveType = "Secp256r1"
// Secp256k1 curve type
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Secp256k1 curveType = "Secp256k1"
)
// SetCurveSecp256r1 Will set the curve parameters to match Secp256r1
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func (ChosenCurve *Curve) SetCurveSecp256r1() {
ChosenCurve.P, _ = new(big.Int).SetString("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF", 16) //Q
ChosenCurve.A, _ = new(big.Int).SetString("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC", 16)
ChosenCurve.B, _ = new(big.Int).SetString("5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B", 16)
ChosenCurve.G.X, _ = new(big.Int).SetString("6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296", 16)
ChosenCurve.G.Y, _ = new(big.Int).SetString("4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5", 16)
ChosenCurve.N, _ = new(big.Int).SetString("FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551", 16)
ChosenCurve.H, _ = new(big.Int).SetString("01", 16)
ChosenCurve.Name = "Secp256r1"
}
// SetCurveSecp256k1 Will set the curve parameters to match Secp256k1
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func (ChosenCurve *Curve) SetCurveSecp256k1() {
ChosenCurve.P, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16)
ChosenCurve.A, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000000", 16)
ChosenCurve.B, _ = new(big.Int).SetString("0000000000000000000000000000000000000000000000000000000000000007", 16)
ChosenCurve.G.X, _ = new(big.Int).SetString("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16)
ChosenCurve.G.Y, _ = new(big.Int).SetString("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", 16)
ChosenCurve.N, _ = new(big.Int).SetString("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16)
ChosenCurve.H, _ = new(big.Int).SetString("01", 16)
ChosenCurve.Name = "Secp256k1"
}
//NewEllipticCurve will instantiate a new EllipticCurve
//Defaults to secp256r1
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func NewEllipticCurve(ct curveType) Curve {
var curve Curve
switch ct {
case Secp256k1:
curve.SetCurveSecp256k1()
case Secp256r1:
curve.SetCurveSecp256r1()
default:
curve.SetCurveSecp256r1()
}
return curve
}