github.com/klaytn/klaytn@v1.12.1/crypto/sha3/xor_unaligned.go (about)

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