github.com/cloudflare/circl@v1.5.0/internal/sha3/xor_generic.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 || appengine) && (!386 || appengine) && (!ppc64le || appengine)
     6  // +build !amd64 appengine
     7  // +build !386 appengine
     8  // +build !ppc64le appengine
     9  
    10  package sha3
    11  
    12  import "encoding/binary"
    13  
    14  // xorIn xors the bytes in buf into the state; it
    15  // makes no non-portable assumptions about memory layout
    16  // or alignment.
    17  func xorIn(d *State, buf []byte) {
    18  	n := len(buf) / 8
    19  
    20  	for i := 0; i < n; i++ {
    21  		a := binary.LittleEndian.Uint64(buf)
    22  		d.a[i] ^= a
    23  		buf = buf[8:]
    24  	}
    25  }
    26  
    27  // copyOut copies ulint64s to a byte buffer.
    28  func copyOut(d *State, b []byte) {
    29  	for i := 0; len(b) >= 8; i++ {
    30  		binary.LittleEndian.PutUint64(b, d.a[i])
    31  		b = b[8:]
    32  	}
    33  }