github.com/turingchain2020/turingchain@v1.1.21/common/crypto/sha3/xor_unaligned.go (about)

     1  // Copyright Turing Corp. 2018 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  // Copyright 2015 The Go Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  // +build amd64 386 ppc64le
    10  // +build !appengine
    11  
    12  package sha3
    13  
    14  import "unsafe"
    15  
    16  func xorInUnaligned(d *state, buf []byte) {
    17  	bw := (*[maxRate / 8]uint64)(unsafe.Pointer(&buf[0]))
    18  	n := len(buf)
    19  	if n >= 72 {
    20  		d.a[0] ^= bw[0]
    21  		d.a[1] ^= bw[1]
    22  		d.a[2] ^= bw[2]
    23  		d.a[3] ^= bw[3]
    24  		d.a[4] ^= bw[4]
    25  		d.a[5] ^= bw[5]
    26  		d.a[6] ^= bw[6]
    27  		d.a[7] ^= bw[7]
    28  		d.a[8] ^= bw[8]
    29  	}
    30  	if n >= 104 {
    31  		d.a[9] ^= bw[9]
    32  		d.a[10] ^= bw[10]
    33  		d.a[11] ^= bw[11]
    34  		d.a[12] ^= bw[12]
    35  	}
    36  	if n >= 136 {
    37  		d.a[13] ^= bw[13]
    38  		d.a[14] ^= bw[14]
    39  		d.a[15] ^= bw[15]
    40  		d.a[16] ^= bw[16]
    41  	}
    42  	if n >= 144 {
    43  		d.a[17] ^= bw[17]
    44  	}
    45  	if n >= 168 {
    46  		d.a[18] ^= bw[18]
    47  		d.a[19] ^= bw[19]
    48  		d.a[20] ^= bw[20]
    49  	}
    50  }
    51  
    52  func copyOutUnaligned(d *state, buf []byte) {
    53  	ab := (*[maxRate]uint8)(unsafe.Pointer(&d.a[0]))
    54  	copy(buf, ab[:])
    55  }
    56  
    57  var (
    58  	xorIn   = xorInUnaligned
    59  	copyOut = copyOutUnaligned
    60  )
    61  
    62  //const xorImplementationUnaligned = "unaligned"