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/usr/share/gocode/src/golang.org/x/crypto/sha3/xor.go is in golang-golang-x-crypto-dev 1:0.0~git20170407.0.55a552f+REALLY.0.0~git20161012.0.5f31782-1.

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build !amd64,!386,!ppc64le appengine

package sha3

var (
	xorIn            = xorInGeneric
	copyOut          = copyOutGeneric
	xorInUnaligned   = xorInGeneric
	copyOutUnaligned = copyOutGeneric
)

const xorImplementationUnaligned = "generic"