github.com/smalaichami/go-bowhead@v0.0.0-20180311002552-16302db95eaa/crypto/bn256/bn256_amd64.go (about)

     1  // Copyright 2018 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // +build amd64,!appengine,!gccgo
    18  
    19  // Package bn256 implements the Optimal Ate pairing over a 256-bit Barreto-Naehrig curve.
    20  package bn256
    21  
    22  import (
    23  	"math/big"
    24  
    25  	"github.com/smalaichami/go-bowhead/crypto/bn256/cloudflare"
    26  )
    27  
    28  // G1 is an abstract cyclic group. The zero value is suitable for use as the
    29  // output of an operation, but cannot be used as an input.
    30  type G1 struct {
    31  	bn256.G1
    32  }
    33  
    34  // Add sets e to a+b and then returns e.
    35  func (e *G1) Add(a, b *G1) *G1 {
    36  	e.G1.Add(&a.G1, &b.G1)
    37  	return e
    38  }
    39  
    40  // ScalarMult sets e to a*k and then returns e.
    41  func (e *G1) ScalarMult(a *G1, k *big.Int) *G1 {
    42  	e.G1.ScalarMult(&a.G1, k)
    43  	return e
    44  }
    45  
    46  // G2 is an abstract cyclic group. The zero value is suitable for use as the
    47  // output of an operation, but cannot be used as an input.
    48  type G2 struct {
    49  	bn256.G2
    50  }
    51  
    52  // PairingCheck calculates the Optimal Ate pairing for a set of points.
    53  func PairingCheck(a []*G1, b []*G2) bool {
    54  	as := make([]*bn256.G1, len(a))
    55  	for i, p := range a {
    56  		as[i] = &p.G1
    57  	}
    58  	bs := make([]*bn256.G2, len(b))
    59  	for i, p := range b {
    60  		bs[i] = &p.G2
    61  	}
    62  	return bn256.PairingCheck(as, bs)
    63  }