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-rw-r--r--crypto/bn256/bn256_other.go63
1 files changed, 63 insertions, 0 deletions
diff --git a/crypto/bn256/bn256_other.go b/crypto/bn256/bn256_other.go
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+++ b/crypto/bn256/bn256_other.go
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+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// +build !amd64 appengine gccgo
+
+// Package bn256 implements the Optimal Ate pairing over a 256-bit Barreto-Naehrig curve.
+package bn256
+
+import (
+ "math/big"
+
+ "github.com/ethereum/go-ethereum/crypto/bn256/google"
+)
+
+// G1 is an abstract cyclic group. The zero value is suitable for use as the
+// output of an operation, but cannot be used as an input.
+type G1 struct {
+ bn256.G1
+}
+
+// Add sets e to a+b and then returns e.
+func (e *G1) Add(a, b *G1) *G1 {
+ e.G1.Add(&a.G1, &b.G1)
+ return e
+}
+
+// ScalarMult sets e to a*k and then returns e.
+func (e *G1) ScalarMult(a *G1, k *big.Int) *G1 {
+ e.G1.ScalarMult(&a.G1, k)
+ return e
+}
+
+// G2 is an abstract cyclic group. The zero value is suitable for use as the
+// output of an operation, but cannot be used as an input.
+type G2 struct {
+ bn256.G2
+}
+
+// PairingCheck calculates the Optimal Ate pairing for a set of points.
+func PairingCheck(a []*G1, b []*G2) bool {
+ as := make([]*bn256.G1, len(a))
+ for i, p := range a {
+ as[i] = &p.G1
+ }
+ bs := make([]*bn256.G2, len(b))
+ for i, p := range b {
+ bs[i] = &p.G2
+ }
+ return bn256.PairingCheck(as, bs)
+}