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/usr/share/gocode/src/golang.org/x/crypto/blake2b/blake2b_ref.go is in golang-golang-x-crypto-dev 1:0.0~git20170629.0.5ef0053-2.

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// Copyright 2016 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 appengine gccgo

package blake2b

func hashBlocks(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
	hashBlocksGeneric(h, c, flag, blocks)
}