You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: scrypt.go
    path of file: ./repos/sealer/vendor/golang.org/x/crypto/scrypt
    
    the code of the file until where you have to start completion: // Copyright 2012 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.

// Package scrypt implements the scrypt key derivation function as defined in
// Colin Percival's paper "Stronger Key Derivation via Sequential Memory-Hard
// Functions" (https://www.tarsnap.com/scrypt/scrypt.pdf).
package scrypt // imp
    
func salsaXOR(tmp *[16]uint32, in, out []uint32) {
	w0 := tmp[0] ^ in[0]
	w1 := tmp[1] ^ in[1]
	w2 := tmp[2] ^ in[2]
	w3 := tmp[3] ^ in[3]
	w4 := tmp[4] ^ in[4]
	w5 := tmp[5] ^ in[5]
	w6 := tmp[6] ^ in[6]
	w7 := tmp[7] ^ in[7]
	w8 := tmp[8] ^ in[8]
	w9 := tmp[9] ^ in[9]
	w10 := tmp[10] ^ in[10]
	w11 := tmp[11] ^ in[11]
	w12 := tmp[12] ^ in[12]
	w13 := tmp[13] ^ in[13]
	w14 := tmp[14] ^ in[14]
	w15 := tmp[15] ^ in[15]

	x0, x1, x2, x3, x4, x5, x6, x7, x8 := w0, w1, w2, w3, w4, w5, w6, w7, w8
	x9, x10, x11, x12, x13, x14, x15 := w9, w10, w11, w12, w13, w14, w15

	for i := 0; i < 8; i += 2 {
		x4 ^= bits.RotateLeft32(x0+x12, 7)
		x8 ^= bits.RotateLeft32(x4+x0, 9)
		x12 ^= bits.RotateLeft32(x8+x4, 13)
		x0 ^= bits.RotateLeft32(x12+x8, 18)

		x9 ^= bits.RotateLeft32(x5+x1, 7)
		x13 ^= bits.RotateLeft32(x9+x5, 9)
		x1 ^= bits.RotateLeft32(x13+x9, 13)
		x5 ^= bits.RotateLeft32(x1+x13, 18)

		x14 ^= bits.RotateLeft32(x10+x6, 7)
		x2 ^= bits.RotateLeft32(x14+x10, 9)
		x6 ^= bits.RotateLeft32(x2+x14, 13)
		x10 ^= bits.RotateLeft32(x6+x2, 18)

		x3 ^= bits.RotateLeft32(x15+x11, 7)
		x7 ^= bits.RotateLeft32(x3+x15, 9)
		x11 ^= bits.RotateLeft32(x7+x3, 13)
		x15 ^= bits.RotateLeft32(x11+x7, 18)

		x1 ^= bits.RotateLeft32(x0+x3, 7)
		x2 ^= bits.RotateLeft32(x1+x0, 9)
		x3 ^= bits.RotateLeft32(x2+x1, 13)
		x0 ^= bits.RotateLeft32(x3+x2, 18)

		x6 ^= bits.RotateLeft32(x5+x4, 7)
		x7 ^= bits.RotateLeft32(x6+x5, 9)
		x4 ^= bits.RotateLeft32(x7+x6, 13)
		x5 ^= bits.RotateLeft32(x4+x7, 18)

		x11 ^= bits.RotateLeft32(x10+x9, 7)
		x8 ^= bits.RotateLeft32(x11+x10, 9)
		x9 ^= bits.RotateLeft32(x8+x11, 13)
		x10 ^= bits.RotateLeft32(x9+x8, 18)

		x12 ^= bits.RotateLeft32(x15+x14, 7)
		x13 ^= bits.RotateLeft32(x12+x15, 9)
		x14 ^= bits.RotateLeft32(x13+x12, 13)
		x15 ^= bits.RotateLeft32(x14+x13, 18)
	}
	x0 += w0
	x1 += w1
	x2 += w2
	x3 += w3
	x4 += w4
	x5 += w5
	x6 += w6
	x7 += w7
	x8 += w8
	x9 += w9
	x10 += w10
	x11 += w11
	x12 += w12
	x13 += w13
	x14 += w14
	x15 += w15

	out[0], tmp[0] = x0, x0
	out[1], tmp[1] = x1, x1
	out[2], tmp[2] = x2, x2
	out[3], tmp[3] = x3, x3
	out[4], tmp[4] = x4, x4
	out[5], tmp[5] = x5, x5
	out[6], tmp[6] = x6, x6
	out[7], tmp[7] = x7, x7
	out[8], tmp[8] = x8, x8
	out[9], tmp[9] = x9, x9
	out[10], tmp[10] = x10, x10
	out[11], tmp[11] = x11, x11
	out[12], tmp[12] = x12, x12
	out[13], tmp[13] = x13, x13
	out[14], tmp[14] = x14, x14
	out[15], tmp[15] = x15, x15
}