vendor/golang.org/x/crypto/sha3/xor_unaligned.go

   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 // +build amd64 386 ppc64le
   6 // +build !appengine
   7
   8 package sha3
   9
  10 import "unsafe"
  11
  12 func xorInUnaligned(d *state, buf []byte) {
  13         bw := (*[maxRate / 8]uint64)(unsafe.Pointer(&buf[0]))
  14         n := len(buf)
  15         if n >= 72 {
  16                 d.a[0] ^= bw[0]
  17                 d.a[1] ^= bw[1]
  18                 d.a[2] ^= bw[2]
  19                 d.a[3] ^= bw[3]
  20                 d.a[4] ^= bw[4]
  21                 d.a[5] ^= bw[5]
  22                 d.a[6] ^= bw[6]
  23                 d.a[7] ^= bw[7]
  24                 d.a[8] ^= bw[8]
  25         }
  26         if n >= 104 {
  27                 d.a[9] ^= bw[9]
  28                 d.a[10] ^= bw[10]
  29                 d.a[11] ^= bw[11]
  30                 d.a[12] ^= bw[12]
  31         }
  32         if n >= 136 {
  33                 d.a[13] ^= bw[13]
  34                 d.a[14] ^= bw[14]
  35                 d.a[15] ^= bw[15]
  36                 d.a[16] ^= bw[16]
  37         }
  38         if n >= 144 {
  39                 d.a[17] ^= bw[17]
  40         }
  41         if n >= 168 {
  42                 d.a[18] ^= bw[18]
  43                 d.a[19] ^= bw[19]
  44                 d.a[20] ^= bw[20]
  45         }
  46 }
  47
  48 func copyOutUnaligned(d *state, buf []byte) {
  49         ab := (*[maxRate]uint8)(unsafe.Pointer(&d.a[0]))
  50         copy(buf, ab[:])
  51 }
  52
  53 var (
  54         xorIn   = xorInUnaligned
  55         copyOut = copyOutUnaligned
  56 )
  57
  58 const xorImplementationUnaligned = "unaligned"