Adding dep files and dependencies.
This commit is contained in:
Renan DelValle
parent
45f9efa578
commit
b341c0a0e4
539 changed files with 313111 additions and 0 deletions
264
vendor/golang.org/x/crypto/internal/chacha20/chacha_generic.go
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264
vendor/golang.org/x/crypto/internal/chacha20/chacha_generic.go
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package ChaCha20 implements the core ChaCha20 function as specified
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// in https://tools.ietf.org/html/rfc7539#section-2.3.
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package chacha20
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import (
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"crypto/cipher"
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"encoding/binary"
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"golang.org/x/crypto/internal/subtle"
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)
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// assert that *Cipher implements cipher.Stream
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var _ cipher.Stream = (*Cipher)(nil)
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// Cipher is a stateful instance of ChaCha20 using a particular key
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// and nonce. A *Cipher implements the cipher.Stream interface.
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type Cipher struct {
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key [8]uint32
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counter uint32 // incremented after each block
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nonce [3]uint32
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buf [bufSize]byte // buffer for unused keystream bytes
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len int // number of unused keystream bytes at end of buf
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}
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// New creates a new ChaCha20 stream cipher with the given key and nonce.
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// The initial counter value is set to 0.
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func New(key [8]uint32, nonce [3]uint32) *Cipher {
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return &Cipher{key: key, nonce: nonce}
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}
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// ChaCha20 constants spelling "expand 32-byte k"
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const (
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j0 uint32 = 0x61707865
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j1 uint32 = 0x3320646e
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j2 uint32 = 0x79622d32
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j3 uint32 = 0x6b206574
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)
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func quarterRound(a, b, c, d uint32) (uint32, uint32, uint32, uint32) {
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a += b
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d ^= a
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d = (d << 16) | (d >> 16)
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c += d
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b ^= c
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b = (b << 12) | (b >> 20)
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a += b
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d ^= a
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d = (d << 8) | (d >> 24)
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c += d
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b ^= c
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b = (b << 7) | (b >> 25)
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return a, b, c, d
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}
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// XORKeyStream XORs each byte in the given slice with a byte from the
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// cipher's key stream. Dst and src must overlap entirely or not at all.
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//
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// If len(dst) < len(src), XORKeyStream will panic. It is acceptable
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// to pass a dst bigger than src, and in that case, XORKeyStream will
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// only update dst[:len(src)] and will not touch the rest of dst.
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//
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// Multiple calls to XORKeyStream behave as if the concatenation of
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// the src buffers was passed in a single run. That is, Cipher
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// maintains state and does not reset at each XORKeyStream call.
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func (s *Cipher) XORKeyStream(dst, src []byte) {
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if len(dst) < len(src) {
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panic("chacha20: output smaller than input")
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}
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if subtle.InexactOverlap(dst[:len(src)], src) {
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panic("chacha20: invalid buffer overlap")
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}
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// xor src with buffered keystream first
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if s.len != 0 {
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buf := s.buf[len(s.buf)-s.len:]
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if len(src) < len(buf) {
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buf = buf[:len(src)]
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}
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td, ts := dst[:len(buf)], src[:len(buf)] // BCE hint
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for i, b := range buf {
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td[i] = ts[i] ^ b
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}
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s.len -= len(buf)
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if s.len != 0 {
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return
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}
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s.buf = [len(s.buf)]byte{} // zero the empty buffer
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src = src[len(buf):]
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dst = dst[len(buf):]
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}
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if len(src) == 0 {
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return
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}
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if haveAsm {
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if uint64(len(src))+uint64(s.counter)*64 > (1<<38)-64 {
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panic("chacha20: counter overflow")
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}
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s.xorKeyStreamAsm(dst, src)
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return
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}
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// set up a 64-byte buffer to pad out the final block if needed
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// (hoisted out of the main loop to avoid spills)
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rem := len(src) % 64 // length of final block
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fin := len(src) - rem // index of final block
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if rem > 0 {
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copy(s.buf[len(s.buf)-64:], src[fin:])
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}
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// pre-calculate most of the first round
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s1, s5, s9, s13 := quarterRound(j1, s.key[1], s.key[5], s.nonce[0])
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s2, s6, s10, s14 := quarterRound(j2, s.key[2], s.key[6], s.nonce[1])
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s3, s7, s11, s15 := quarterRound(j3, s.key[3], s.key[7], s.nonce[2])
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n := len(src)
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src, dst = src[:n:n], dst[:n:n] // BCE hint
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for i := 0; i < n; i += 64 {
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// calculate the remainder of the first round
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s0, s4, s8, s12 := quarterRound(j0, s.key[0], s.key[4], s.counter)
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// execute the second round
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x0, x5, x10, x15 := quarterRound(s0, s5, s10, s15)
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x1, x6, x11, x12 := quarterRound(s1, s6, s11, s12)
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x2, x7, x8, x13 := quarterRound(s2, s7, s8, s13)
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x3, x4, x9, x14 := quarterRound(s3, s4, s9, s14)
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// execute the remaining 18 rounds
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for i := 0; i < 9; i++ {
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x0, x4, x8, x12 = quarterRound(x0, x4, x8, x12)
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x1, x5, x9, x13 = quarterRound(x1, x5, x9, x13)
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x2, x6, x10, x14 = quarterRound(x2, x6, x10, x14)
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x3, x7, x11, x15 = quarterRound(x3, x7, x11, x15)
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x0, x5, x10, x15 = quarterRound(x0, x5, x10, x15)
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x1, x6, x11, x12 = quarterRound(x1, x6, x11, x12)
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x2, x7, x8, x13 = quarterRound(x2, x7, x8, x13)
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x3, x4, x9, x14 = quarterRound(x3, x4, x9, x14)
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}
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x0 += j0
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x1 += j1
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x2 += j2
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x3 += j3
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x4 += s.key[0]
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x5 += s.key[1]
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x6 += s.key[2]
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x7 += s.key[3]
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x8 += s.key[4]
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x9 += s.key[5]
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x10 += s.key[6]
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x11 += s.key[7]
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x12 += s.counter
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x13 += s.nonce[0]
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x14 += s.nonce[1]
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x15 += s.nonce[2]
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// increment the counter
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s.counter += 1
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if s.counter == 0 {
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panic("chacha20: counter overflow")
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}
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// pad to 64 bytes if needed
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in, out := src[i:], dst[i:]
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if i == fin {
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// src[fin:] has already been copied into s.buf before
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// the main loop
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in, out = s.buf[len(s.buf)-64:], s.buf[len(s.buf)-64:]
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}
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in, out = in[:64], out[:64] // BCE hint
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// XOR the key stream with the source and write out the result
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xor(out[0:], in[0:], x0)
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xor(out[4:], in[4:], x1)
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xor(out[8:], in[8:], x2)
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xor(out[12:], in[12:], x3)
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xor(out[16:], in[16:], x4)
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xor(out[20:], in[20:], x5)
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xor(out[24:], in[24:], x6)
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xor(out[28:], in[28:], x7)
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xor(out[32:], in[32:], x8)
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xor(out[36:], in[36:], x9)
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xor(out[40:], in[40:], x10)
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xor(out[44:], in[44:], x11)
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xor(out[48:], in[48:], x12)
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xor(out[52:], in[52:], x13)
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xor(out[56:], in[56:], x14)
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xor(out[60:], in[60:], x15)
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}
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// copy any trailing bytes out of the buffer and into dst
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if rem != 0 {
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s.len = 64 - rem
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copy(dst[fin:], s.buf[len(s.buf)-64:])
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}
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}
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// Advance discards bytes in the key stream until the next 64 byte block
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// boundary is reached and updates the counter accordingly. If the key
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// stream is already at a block boundary no bytes will be discarded and
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// the counter will be unchanged.
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func (s *Cipher) Advance() {
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s.len -= s.len % 64
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if s.len == 0 {
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s.buf = [len(s.buf)]byte{}
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}
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}
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// XORKeyStream crypts bytes from in to out using the given key and counters.
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// In and out must overlap entirely or not at all. Counter contains the raw
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// ChaCha20 counter bytes (i.e. block counter followed by nonce).
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func XORKeyStream(out, in []byte, counter *[16]byte, key *[32]byte) {
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s := Cipher{
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key: [8]uint32{
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binary.LittleEndian.Uint32(key[0:4]),
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binary.LittleEndian.Uint32(key[4:8]),
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binary.LittleEndian.Uint32(key[8:12]),
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binary.LittleEndian.Uint32(key[12:16]),
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binary.LittleEndian.Uint32(key[16:20]),
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binary.LittleEndian.Uint32(key[20:24]),
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binary.LittleEndian.Uint32(key[24:28]),
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binary.LittleEndian.Uint32(key[28:32]),
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},
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nonce: [3]uint32{
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binary.LittleEndian.Uint32(counter[4:8]),
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binary.LittleEndian.Uint32(counter[8:12]),
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binary.LittleEndian.Uint32(counter[12:16]),
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},
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counter: binary.LittleEndian.Uint32(counter[0:4]),
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}
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s.XORKeyStream(out, in)
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}
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// HChaCha20 uses the ChaCha20 core to generate a derived key from a key and a
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// nonce. It should only be used as part of the XChaCha20 construction.
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func HChaCha20(key *[8]uint32, nonce *[4]uint32) [8]uint32 {
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x0, x1, x2, x3 := j0, j1, j2, j3
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x4, x5, x6, x7 := key[0], key[1], key[2], key[3]
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x8, x9, x10, x11 := key[4], key[5], key[6], key[7]
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x12, x13, x14, x15 := nonce[0], nonce[1], nonce[2], nonce[3]
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for i := 0; i < 10; i++ {
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x0, x4, x8, x12 = quarterRound(x0, x4, x8, x12)
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x1, x5, x9, x13 = quarterRound(x1, x5, x9, x13)
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x2, x6, x10, x14 = quarterRound(x2, x6, x10, x14)
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x3, x7, x11, x15 = quarterRound(x3, x7, x11, x15)
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x0, x5, x10, x15 = quarterRound(x0, x5, x10, x15)
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x1, x6, x11, x12 = quarterRound(x1, x6, x11, x12)
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x2, x7, x8, x13 = quarterRound(x2, x7, x8, x13)
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x3, x4, x9, x14 = quarterRound(x3, x4, x9, x14)
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}
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var out [8]uint32
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out[0], out[1], out[2], out[3] = x0, x1, x2, x3
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out[4], out[5], out[6], out[7] = x12, x13, x14, x15
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return out
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}
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16
vendor/golang.org/x/crypto/internal/chacha20/chacha_noasm.go
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16
vendor/golang.org/x/crypto/internal/chacha20/chacha_noasm.go
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !s390x gccgo appengine
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package chacha20
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const (
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bufSize = 64
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haveAsm = false
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)
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func (*Cipher) xorKeyStreamAsm(dst, src []byte) {
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panic("not implemented")
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}
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30
vendor/golang.org/x/crypto/internal/chacha20/chacha_s390x.go
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30
vendor/golang.org/x/crypto/internal/chacha20/chacha_s390x.go
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build s390x,!gccgo,!appengine
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package chacha20
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var haveAsm = hasVectorFacility()
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const bufSize = 256
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// hasVectorFacility reports whether the machine supports the vector
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// facility (vx).
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// Implementation in asm_s390x.s.
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func hasVectorFacility() bool
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// xorKeyStreamVX is an assembly implementation of XORKeyStream. It must only
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// be called when the vector facility is available.
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// Implementation in asm_s390x.s.
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//go:noescape
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func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32, buf *[256]byte, len *int)
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func (c *Cipher) xorKeyStreamAsm(dst, src []byte) {
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xorKeyStreamVX(dst, src, &c.key, &c.nonce, &c.counter, &c.buf, &c.len)
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}
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// EXRL targets, DO NOT CALL!
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func mvcSrcToBuf()
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func mvcBufToDst()
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283
vendor/golang.org/x/crypto/internal/chacha20/chacha_s390x.s
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283
vendor/golang.org/x/crypto/internal/chacha20/chacha_s390x.s
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build s390x,!gccgo,!appengine
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#include "go_asm.h"
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#include "textflag.h"
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// This is an implementation of the ChaCha20 encryption algorithm as
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// specified in RFC 7539. It uses vector instructions to compute
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// 4 keystream blocks in parallel (256 bytes) which are then XORed
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// with the bytes in the input slice.
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GLOBL ·constants<>(SB), RODATA|NOPTR, $32
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// BSWAP: swap bytes in each 4-byte element
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DATA ·constants<>+0x00(SB)/4, $0x03020100
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DATA ·constants<>+0x04(SB)/4, $0x07060504
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DATA ·constants<>+0x08(SB)/4, $0x0b0a0908
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DATA ·constants<>+0x0c(SB)/4, $0x0f0e0d0c
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// J0: [j0, j1, j2, j3]
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DATA ·constants<>+0x10(SB)/4, $0x61707865
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DATA ·constants<>+0x14(SB)/4, $0x3320646e
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DATA ·constants<>+0x18(SB)/4, $0x79622d32
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DATA ·constants<>+0x1c(SB)/4, $0x6b206574
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// EXRL targets:
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TEXT ·mvcSrcToBuf(SB), NOFRAME|NOSPLIT, $0
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MVC $1, (R1), (R8)
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RET
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TEXT ·mvcBufToDst(SB), NOFRAME|NOSPLIT, $0
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MVC $1, (R8), (R9)
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RET
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#define BSWAP V5
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#define J0 V6
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#define KEY0 V7
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#define KEY1 V8
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#define NONCE V9
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#define CTR V10
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#define M0 V11
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#define M1 V12
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#define M2 V13
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#define M3 V14
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#define INC V15
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#define X0 V16
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#define X1 V17
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#define X2 V18
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#define X3 V19
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#define X4 V20
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#define X5 V21
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#define X6 V22
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#define X7 V23
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#define X8 V24
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#define X9 V25
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#define X10 V26
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#define X11 V27
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#define X12 V28
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#define X13 V29
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#define X14 V30
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#define X15 V31
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#define NUM_ROUNDS 20
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#define ROUND4(a0, a1, a2, a3, b0, b1, b2, b3, c0, c1, c2, c3, d0, d1, d2, d3) \
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VAF a1, a0, a0 \
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VAF b1, b0, b0 \
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VAF c1, c0, c0 \
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VAF d1, d0, d0 \
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VX a0, a2, a2 \
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VX b0, b2, b2 \
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VX c0, c2, c2 \
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VX d0, d2, d2 \
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VERLLF $16, a2, a2 \
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VERLLF $16, b2, b2 \
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VERLLF $16, c2, c2 \
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VERLLF $16, d2, d2 \
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VAF a2, a3, a3 \
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VAF b2, b3, b3 \
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VAF c2, c3, c3 \
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VAF d2, d3, d3 \
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VX a3, a1, a1 \
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VX b3, b1, b1 \
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VX c3, c1, c1 \
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VX d3, d1, d1 \
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VERLLF $12, a1, a1 \
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VERLLF $12, b1, b1 \
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VERLLF $12, c1, c1 \
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VERLLF $12, d1, d1 \
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VAF a1, a0, a0 \
|
||||
VAF b1, b0, b0 \
|
||||
VAF c1, c0, c0 \
|
||||
VAF d1, d0, d0 \
|
||||
VX a0, a2, a2 \
|
||||
VX b0, b2, b2 \
|
||||
VX c0, c2, c2 \
|
||||
VX d0, d2, d2 \
|
||||
VERLLF $8, a2, a2 \
|
||||
VERLLF $8, b2, b2 \
|
||||
VERLLF $8, c2, c2 \
|
||||
VERLLF $8, d2, d2 \
|
||||
VAF a2, a3, a3 \
|
||||
VAF b2, b3, b3 \
|
||||
VAF c2, c3, c3 \
|
||||
VAF d2, d3, d3 \
|
||||
VX a3, a1, a1 \
|
||||
VX b3, b1, b1 \
|
||||
VX c3, c1, c1 \
|
||||
VX d3, d1, d1 \
|
||||
VERLLF $7, a1, a1 \
|
||||
VERLLF $7, b1, b1 \
|
||||
VERLLF $7, c1, c1 \
|
||||
VERLLF $7, d1, d1
|
||||
|
||||
#define PERMUTE(mask, v0, v1, v2, v3) \
|
||||
VPERM v0, v0, mask, v0 \
|
||||
VPERM v1, v1, mask, v1 \
|
||||
VPERM v2, v2, mask, v2 \
|
||||
VPERM v3, v3, mask, v3
|
||||
|
||||
#define ADDV(x, v0, v1, v2, v3) \
|
||||
VAF x, v0, v0 \
|
||||
VAF x, v1, v1 \
|
||||
VAF x, v2, v2 \
|
||||
VAF x, v3, v3
|
||||
|
||||
#define XORV(off, dst, src, v0, v1, v2, v3) \
|
||||
VLM off(src), M0, M3 \
|
||||
PERMUTE(BSWAP, v0, v1, v2, v3) \
|
||||
VX v0, M0, M0 \
|
||||
VX v1, M1, M1 \
|
||||
VX v2, M2, M2 \
|
||||
VX v3, M3, M3 \
|
||||
VSTM M0, M3, off(dst)
|
||||
|
||||
#define SHUFFLE(a, b, c, d, t, u, v, w) \
|
||||
VMRHF a, c, t \ // t = {a[0], c[0], a[1], c[1]}
|
||||
VMRHF b, d, u \ // u = {b[0], d[0], b[1], d[1]}
|
||||
VMRLF a, c, v \ // v = {a[2], c[2], a[3], c[3]}
|
||||
VMRLF b, d, w \ // w = {b[2], d[2], b[3], d[3]}
|
||||
VMRHF t, u, a \ // a = {a[0], b[0], c[0], d[0]}
|
||||
VMRLF t, u, b \ // b = {a[1], b[1], c[1], d[1]}
|
||||
VMRHF v, w, c \ // c = {a[2], b[2], c[2], d[2]}
|
||||
VMRLF v, w, d // d = {a[3], b[3], c[3], d[3]}
|
||||
|
||||
// func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32, buf *[256]byte, len *int)
|
||||
TEXT ·xorKeyStreamVX(SB), NOSPLIT, $0
|
||||
MOVD $·constants<>(SB), R1
|
||||
MOVD dst+0(FP), R2 // R2=&dst[0]
|
||||
LMG src+24(FP), R3, R4 // R3=&src[0] R4=len(src)
|
||||
MOVD key+48(FP), R5 // R5=key
|
||||
MOVD nonce+56(FP), R6 // R6=nonce
|
||||
MOVD counter+64(FP), R7 // R7=counter
|
||||
MOVD buf+72(FP), R8 // R8=buf
|
||||
MOVD len+80(FP), R9 // R9=len
|
||||
|
||||
// load BSWAP and J0
|
||||
VLM (R1), BSWAP, J0
|
||||
|
||||
// set up tail buffer
|
||||
ADD $-1, R4, R12
|
||||
MOVBZ R12, R12
|
||||
CMPUBEQ R12, $255, aligned
|
||||
MOVD R4, R1
|
||||
AND $~255, R1
|
||||
MOVD $(R3)(R1*1), R1
|
||||
EXRL $·mvcSrcToBuf(SB), R12
|
||||
MOVD $255, R0
|
||||
SUB R12, R0
|
||||
MOVD R0, (R9) // update len
|
||||
|
||||
aligned:
|
||||
// setup
|
||||
MOVD $95, R0
|
||||
VLM (R5), KEY0, KEY1
|
||||
VLL R0, (R6), NONCE
|
||||
VZERO M0
|
||||
VLEIB $7, $32, M0
|
||||
VSRLB M0, NONCE, NONCE
|
||||
|
||||
// initialize counter values
|
||||
VLREPF (R7), CTR
|
||||
VZERO INC
|
||||
VLEIF $1, $1, INC
|
||||
VLEIF $2, $2, INC
|
||||
VLEIF $3, $3, INC
|
||||
VAF INC, CTR, CTR
|
||||
VREPIF $4, INC
|
||||
|
||||
chacha:
|
||||
VREPF $0, J0, X0
|
||||
VREPF $1, J0, X1
|
||||
VREPF $2, J0, X2
|
||||
VREPF $3, J0, X3
|
||||
VREPF $0, KEY0, X4
|
||||
VREPF $1, KEY0, X5
|
||||
VREPF $2, KEY0, X6
|
||||
VREPF $3, KEY0, X7
|
||||
VREPF $0, KEY1, X8
|
||||
VREPF $1, KEY1, X9
|
||||
VREPF $2, KEY1, X10
|
||||
VREPF $3, KEY1, X11
|
||||
VLR CTR, X12
|
||||
VREPF $1, NONCE, X13
|
||||
VREPF $2, NONCE, X14
|
||||
VREPF $3, NONCE, X15
|
||||
|
||||
MOVD $(NUM_ROUNDS/2), R1
|
||||
|
||||
loop:
|
||||
ROUND4(X0, X4, X12, X8, X1, X5, X13, X9, X2, X6, X14, X10, X3, X7, X15, X11)
|
||||
ROUND4(X0, X5, X15, X10, X1, X6, X12, X11, X2, X7, X13, X8, X3, X4, X14, X9)
|
||||
|
||||
ADD $-1, R1
|
||||
BNE loop
|
||||
|
||||
// decrement length
|
||||
ADD $-256, R4
|
||||
BLT tail
|
||||
|
||||
continue:
|
||||
// rearrange vectors
|
||||
SHUFFLE(X0, X1, X2, X3, M0, M1, M2, M3)
|
||||
ADDV(J0, X0, X1, X2, X3)
|
||||
SHUFFLE(X4, X5, X6, X7, M0, M1, M2, M3)
|
||||
ADDV(KEY0, X4, X5, X6, X7)
|
||||
SHUFFLE(X8, X9, X10, X11, M0, M1, M2, M3)
|
||||
ADDV(KEY1, X8, X9, X10, X11)
|
||||
VAF CTR, X12, X12
|
||||
SHUFFLE(X12, X13, X14, X15, M0, M1, M2, M3)
|
||||
ADDV(NONCE, X12, X13, X14, X15)
|
||||
|
||||
// increment counters
|
||||
VAF INC, CTR, CTR
|
||||
|
||||
// xor keystream with plaintext
|
||||
XORV(0*64, R2, R3, X0, X4, X8, X12)
|
||||
XORV(1*64, R2, R3, X1, X5, X9, X13)
|
||||
XORV(2*64, R2, R3, X2, X6, X10, X14)
|
||||
XORV(3*64, R2, R3, X3, X7, X11, X15)
|
||||
|
||||
// increment pointers
|
||||
MOVD $256(R2), R2
|
||||
MOVD $256(R3), R3
|
||||
|
||||
CMPBNE R4, $0, chacha
|
||||
CMPUBEQ R12, $255, return
|
||||
EXRL $·mvcBufToDst(SB), R12 // len was updated during setup
|
||||
|
||||
return:
|
||||
VSTEF $0, CTR, (R7)
|
||||
RET
|
||||
|
||||
tail:
|
||||
MOVD R2, R9
|
||||
MOVD R8, R2
|
||||
MOVD R8, R3
|
||||
MOVD $0, R4
|
||||
JMP continue
|
||||
|
||||
// func hasVectorFacility() bool
|
||||
TEXT ·hasVectorFacility(SB), NOSPLIT, $24-1
|
||||
MOVD $x-24(SP), R1
|
||||
XC $24, 0(R1), 0(R1) // clear the storage
|
||||
MOVD $2, R0 // R0 is the number of double words stored -1
|
||||
WORD $0xB2B01000 // STFLE 0(R1)
|
||||
XOR R0, R0 // reset the value of R0
|
||||
MOVBZ z-8(SP), R1
|
||||
AND $0x40, R1
|
||||
BEQ novector
|
||||
|
||||
vectorinstalled:
|
||||
// check if the vector instruction has been enabled
|
||||
VLEIB $0, $0xF, V16
|
||||
VLGVB $0, V16, R1
|
||||
CMPBNE R1, $0xF, novector
|
||||
MOVB $1, ret+0(FP) // have vx
|
||||
RET
|
||||
|
||||
novector:
|
||||
MOVB $0, ret+0(FP) // no vx
|
||||
RET
|
||||
43
vendor/golang.org/x/crypto/internal/chacha20/xor.go
generated
vendored
Normal file
43
vendor/golang.org/x/crypto/internal/chacha20/xor.go
generated
vendored
Normal file
|
|
@ -0,0 +1,43 @@
|
|||
// Copyright 2018 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found src the LICENSE file.
|
||||
|
||||
package chacha20
|
||||
|
||||
import (
|
||||
"runtime"
|
||||
)
|
||||
|
||||
// Platforms that have fast unaligned 32-bit little endian accesses.
|
||||
const unaligned = runtime.GOARCH == "386" ||
|
||||
runtime.GOARCH == "amd64" ||
|
||||
runtime.GOARCH == "arm64" ||
|
||||
runtime.GOARCH == "ppc64le" ||
|
||||
runtime.GOARCH == "s390x"
|
||||
|
||||
// xor reads a little endian uint32 from src, XORs it with u and
|
||||
// places the result in little endian byte order in dst.
|
||||
func xor(dst, src []byte, u uint32) {
|
||||
_, _ = src[3], dst[3] // eliminate bounds checks
|
||||
if unaligned {
|
||||
// The compiler should optimize this code into
|
||||
// 32-bit unaligned little endian loads and stores.
|
||||
// TODO: delete once the compiler does a reliably
|
||||
// good job with the generic code below.
|
||||
// See issue #25111 for more details.
|
||||
v := uint32(src[0])
|
||||
v |= uint32(src[1]) << 8
|
||||
v |= uint32(src[2]) << 16
|
||||
v |= uint32(src[3]) << 24
|
||||
v ^= u
|
||||
dst[0] = byte(v)
|
||||
dst[1] = byte(v >> 8)
|
||||
dst[2] = byte(v >> 16)
|
||||
dst[3] = byte(v >> 24)
|
||||
} else {
|
||||
dst[0] = src[0] ^ byte(u)
|
||||
dst[1] = src[1] ^ byte(u>>8)
|
||||
dst[2] = src[2] ^ byte(u>>16)
|
||||
dst[3] = src[3] ^ byte(u>>24)
|
||||
}
|
||||
}
|
||||
Reference in a new issue