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- /* Copyright (c) 2016, Google Inc.
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
-
- package main
-
- import (
- "flag"
- "fmt"
- "os"
- "os/exec"
- "path/filepath"
- "strings"
- "syscall"
- )
-
- var (
- boringsslDir = flag.String("boringssl", ".", "The path to the BoringSSL checkout.")
- opensslDir = flag.String("openssl", filepath.Join("..", "openssl"), "The path to the OpenSSL checkout.")
- )
-
- func mapName(path string) string {
- path = strings.Replace(path, filepath.FromSlash("/fipsmodule/"), string(filepath.Separator), 1)
- switch filepath.ToSlash(path) {
- case "crypto/cipher_extra/asm/aes128gcmsiv-x86_64.pl", "crypto/cipher_extra/asm/chacha20_poly1305_x86_64.pl", "crypto/rand/asm/rdrand-x86_64.pl":
- return ""
- case "crypto/ec/asm/p256-x86_64-asm.pl":
- return filepath.FromSlash("crypto/ec/asm/ecp_nistz256-x86_64.pl")
- }
- return path
- }
-
- func diff(from, to string) error {
- cmd := exec.Command("diff", "-u", "--", from, to)
- cmd.Stdout = os.Stdout
- cmd.Stderr = os.Stderr
- err := cmd.Run()
- // diff returns exit code 1 if the files differ but it was otherwise
- // successful.
- if exitError, ok := err.(*exec.ExitError); ok && exitError.Sys().(syscall.WaitStatus).ExitStatus() == 1 {
- return nil
- }
- return err
- }
-
- func main() {
- flag.Usage = func() {
- fmt.Fprintf(os.Stderr, "Usage: diff_asm [flag...] [filter...]\n")
- fmt.Fprintf(os.Stderr, "Filter arguments limit to assembly files which match arguments.\n")
- fmt.Fprintf(os.Stderr, "If not using a filter, piping to `diffstat` may be useful.\n\n")
- flag.PrintDefaults()
- }
- flag.Parse()
-
- // Find all the assembly files.
- var files []string
- err := filepath.Walk(*boringsslDir, func(path string, info os.FileInfo, err error) error {
- if err != nil {
- return nil
- }
-
- path, err = filepath.Rel(*boringsslDir, path)
- if err != nil {
- return err
- }
-
- dir := filepath.Base(filepath.Dir(path))
- if !info.IsDir() && (dir == "asm" || dir == "perlasm") && strings.HasSuffix(filepath.Base(path), ".pl") {
- files = append(files, path)
- }
-
- return nil
- })
- if err != nil {
- fmt.Fprintf(os.Stderr, "Error finding assembly: %s\n", err)
- os.Exit(1)
- }
-
- for _, file := range files {
- opensslFile := mapName(file)
- if len(opensslFile) == 0 {
- continue
- }
-
- if flag.NArg() > 0 {
- var found bool
- for _, arg := range flag.Args() {
- if strings.Contains(file, arg) {
- found = true
- break
- }
- }
- if !found {
- continue
- }
- }
-
- if err := diff(filepath.Join(*opensslDir, opensslFile), filepath.Join(*boringsslDir, file)); err != nil {
- fmt.Fprintf(os.Stderr, "Error comparing %s: %s\n", file, err)
- os.Exit(1)
- }
- }
- }
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