crypto/bn256: full switchover to cloudflare's code (#16301)

* crypto/bn256: full switchover to cloudflare's code

* crypto/bn256: only use cloudflare for optimized architectures

* crypto/bn256: upstream fallback for non-optimized code

* .travis, build: drop support for Go 1.8 (need type aliases)

* crypto/bn256/cloudflare: enable curve mul lattice optimization

1 files changed, 0 insertions, 63 deletions

diff --git a/crypto/bn256/bn256_other.go b/crypto/bn256/bn256_other.go
deleted file mode 100644
index 81977a0a8..000000000
--- a/crypto/bn256/bn256_other.go
+++ /dev/null
@@ -1,63 +0,0 @@
-// 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)
-}