1// Copyright 2015 The Go Authors. All rights reserved.
 2// Use of this source code is governed by a BSD-style
 3// license that can be found in the LICENSE file.
 4
 5//go:build (amd64 || 386 || ppc64le) && !appengine
 6// +build amd64 386 ppc64le
 7// +build !appengine
 8
 9package sha3
10
11import "unsafe"
12
13// A storageBuf is an aligned array of maxRate bytes.
14type storageBuf [maxRate / 8]uint64
15
16func (b *storageBuf) asBytes() *[maxRate]byte {
17	return (*[maxRate]byte)(unsafe.Pointer(b))
18}
19
20// xorInuses unaligned reads and writes to update d.a to contain d.a
21// XOR buf.
22func xorIn(d *State, buf []byte) {
23	n := len(buf)
24	bw := (*[maxRate / 8]uint64)(unsafe.Pointer(&buf[0]))[: n/8 : n/8]
25	if n >= 72 {
26		d.a[0] ^= bw[0]
27		d.a[1] ^= bw[1]
28		d.a[2] ^= bw[2]
29		d.a[3] ^= bw[3]
30		d.a[4] ^= bw[4]
31		d.a[5] ^= bw[5]
32		d.a[6] ^= bw[6]
33		d.a[7] ^= bw[7]
34		d.a[8] ^= bw[8]
35	}
36	if n >= 104 {
37		d.a[9] ^= bw[9]
38		d.a[10] ^= bw[10]
39		d.a[11] ^= bw[11]
40		d.a[12] ^= bw[12]
41	}
42	if n >= 136 {
43		d.a[13] ^= bw[13]
44		d.a[14] ^= bw[14]
45		d.a[15] ^= bw[15]
46		d.a[16] ^= bw[16]
47	}
48	if n >= 144 {
49		d.a[17] ^= bw[17]
50	}
51	if n >= 168 {
52		d.a[18] ^= bw[18]
53		d.a[19] ^= bw[19]
54		d.a[20] ^= bw[20]
55	}
56}
57
58func copyOut(d *State, buf []byte) {
59	ab := (*[maxRate]uint8)(unsafe.Pointer(&d.a[0]))
60	copy(buf, ab[:])
61}