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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)
pathSlash := filepath.ToSlash(path)
if strings.HasPrefix(pathSlash, "crypto/test/") {
return ""
}
switch pathSlash {
case "crypto/aes/asm/vpaes-armv7.pl",
"crypto/cipher_extra/asm/aes128gcmsiv-x86_64.pl",
"crypto/cipher_extra/asm/chacha20_poly1305_x86_64.pl",
"crypto/ec/asm/p256_beeu-x86_64-asm.pl",
"crypto/modes/asm/ghash-neon-armv8.pl",
"crypto/modes/asm/ghash-ssse3-x86.pl",
"crypto/modes/asm/ghash-ssse3-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)
}
}
}