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			108 lines
		
	
	
		
			3.3 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
			
		
		
	
	
			108 lines
		
	
	
		
			3.3 KiB
		
	
	
	
		
			Go
		
	
	
	
	
	
//
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// Copyright Coinbase, Inc. All Rights Reserved.
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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package v1
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import (
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	"crypto/elliptic"
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	"math/big"
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	"sync"
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	"source.quilibrium.com/quilibrium/monorepo/nekryptology/internal"
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	"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves/native"
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	"source.quilibrium.com/quilibrium/monorepo/nekryptology/pkg/core/curves/native/bls12381"
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)
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var bls12381g1Initonce sync.Once
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var bls12381g1 Bls12381G1Curve
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type Bls12381G1Curve struct {
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	*elliptic.CurveParams
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}
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func bls12381g1InitAll() {
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	bls12381g1.CurveParams = new(elliptic.CurveParams)
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	bls12381g1.P, _ = new(big.Int).SetString("1a0111ea397fe69a4b1ba7b6434bacd764774b84f38512bf6730d2a0f6b0f6241eabfffeb153ffffb9feffffffffaaab", 16)
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	bls12381g1.N = bls12381.Bls12381FqNew().Params.BiModulus
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	bls12381g1.B, _ = new(big.Int).SetString("0bbc3efc5008a26a0e1c8c3fad0059c051ac582950405194dd595f13570725ce8c22631a7918fd8ebaac93d50ce72271", 16)
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	bls12381g1.Gx, _ = new(big.Int).SetString("120177419e0bfb75edce6ecc21dbf440f0ae6acdf3d0e747154f95c7143ba1c17817fc679976fff55cb38790fd530c16", 16)
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	bls12381g1.Gy, _ = new(big.Int).SetString("0bbc3efc5008a26a0e1c8c3fad0059c051ac582950405194dd595f13570725ce8c22631a7918fd8ebaac93d50ce72271", 16)
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	bls12381g1.BitSize = 381
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	bls12381g1.Name = "Bls12381G1"
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}
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func Bls12381G1() *Bls12381G1Curve {
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	bls12381g1Initonce.Do(bls12381g1InitAll)
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	return &bls12381g1
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}
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func (curve *Bls12381G1Curve) Params() *elliptic.CurveParams {
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	return curve.CurveParams
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}
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func (curve *Bls12381G1Curve) IsOnCurve(x, y *big.Int) bool {
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	_, err := new(bls12381.G1).SetBigInt(x, y)
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	return err == nil
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}
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func (curve *Bls12381G1Curve) Add(x1, y1, x2, y2 *big.Int) (*big.Int, *big.Int) {
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	p1, err1 := new(bls12381.G1).SetBigInt(x1, y1)
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	p2, err2 := new(bls12381.G1).SetBigInt(x2, y2)
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	if err1 != nil || err2 != nil {
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		return nil, nil
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	}
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	return p1.Add(p1, p2).BigInt()
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}
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func (curve *Bls12381G1Curve) Double(x1, y1 *big.Int) (*big.Int, *big.Int) {
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	p, err := new(bls12381.G1).SetBigInt(x1, y1)
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	if err != nil {
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		return nil, nil
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	}
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	return p.Double(p).BigInt()
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}
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func (curve *Bls12381G1Curve) ScalarMult(Bx, By *big.Int, k []byte) (*big.Int, *big.Int) {
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	p, err := new(bls12381.G1).SetBigInt(Bx, By)
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	if err != nil {
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		return nil, nil
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	}
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	var bb [native.FieldBytes]byte
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	copy(bb[:], k)
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	s, err := bls12381.Bls12381FqNew().SetBytes(&bb)
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	if err != nil {
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		return nil, nil
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	}
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	return p.Mul(p, s).BigInt()
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}
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func (curve *Bls12381G1Curve) ScalarBaseMult(k []byte) (*big.Int, *big.Int) {
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	p := new(bls12381.G1).Generator()
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	var bb [native.FieldBytes]byte
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	copy(bb[:], internal.ReverseScalarBytes(k))
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	s, err := bls12381.Bls12381FqNew().SetBytes(&bb)
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	if err != nil {
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		return nil, nil
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	}
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	return p.Mul(p, s).BigInt()
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}
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// Hash an arbitrary byte sequence to a G1 point according to the hash-to-curve standard
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func (curve *Bls12381G1Curve) Hash(msg []byte) (*big.Int, *big.Int) {
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	return new(bls12381.G1).Hash(native.EllipticPointHasherSha256(), msg, []byte("BLS12381G1_XMD:SHA-256_SSWU_RO_")).BigInt()
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}
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// CompressedBytesFromBigInts takes x and y coordinates and converts them to the BLS compressed point form
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func (curve *Bls12381G1Curve) CompressedBytesFromBigInts(x, y *big.Int) ([]byte, error) {
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	p, err := new(bls12381.G1).SetBigInt(x, y)
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	if err != nil {
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		return nil, err
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	}
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	out := p.ToCompressed()
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	return out[:], nil
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}
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