use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/aead/chacha20/chacha/chacha_ref.go

@@ -0,0 +1,33 @@
+// Copyright (c) 2016 Andreas Auernhammer. All rights reserved.
+// Use of this source code is governed by a license that can be
+// found in the LICENSE file.
+
+// +build !amd64,!386 gccgo appengine nacl
+
+package chacha
+
+import "encoding/binary"
+
+func init() {
+	useSSE2 = false
+	useSSSE3 = false
+	useAVX = false
+	useAVX2 = false
+}
+
+func initialize(state *[64]byte, key []byte, nonce *[16]byte) {
+	binary.LittleEndian.PutUint32(state[0:], sigma[0])
+	binary.LittleEndian.PutUint32(state[4:], sigma[1])
+	binary.LittleEndian.PutUint32(state[8:], sigma[2])
+	binary.LittleEndian.PutUint32(state[12:], sigma[3])
+	copy(state[16:], key[:])
+	copy(state[48:], nonce[:])
+}
+
+func xorKeyStream(dst, src []byte, block, state *[64]byte, rounds int) int {
+	return xorKeyStreamGeneric(dst, src, block, state, rounds)
+}
+
+func hChaCha20(out *[32]byte, nonce *[16]byte, key *[32]byte) {
+	hChaCha20Generic(out, nonce, key)
+}