1 /* Copyright (c) 2016, Google Inc. 2 * 3 * Permission to use, copy, modify, and/or distribute this software for any 4 * purpose with or without fee is hereby granted, provided that the above 5 * copyright notice and this permission notice appear in all copies. 6 * 7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ 14 15 package main 16 17 import ( 18 "flag" 19 "fmt" 20 "os" 21 "os/exec" 22 "path/filepath" 23 "strings" 24 "syscall" 25 ) 26 27 var ( 28 boringsslDir = flag.String("boringssl", ".", "The path to the BoringSSL checkout.") 29 opensslDir = flag.String("openssl", filepath.Join("..", "openssl"), "The path to the OpenSSL checkout.") 30 ) 31 32 func mapName(path string) string { 33 path = strings.Replace(path, filepath.FromSlash("/fipsmodule/"), string(filepath.Separator), 1) 34 switch filepath.ToSlash(path) { 35 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": 36 return "" 37 case "crypto/ec/asm/p256-x86_64-asm.pl": 38 return filepath.FromSlash("crypto/ec/asm/ecp_nistz256-x86_64.pl") 39 } 40 return path 41 } 42 43 func diff(from, to string) error { 44 cmd := exec.Command("diff", "-u", "--", from, to) 45 cmd.Stdout = os.Stdout 46 cmd.Stderr = os.Stderr 47 err := cmd.Run() 48 // diff returns exit code 1 if the files differ but it was otherwise 49 // successful. 50 if exitError, ok := err.(*exec.ExitError); ok && exitError.Sys().(syscall.WaitStatus).ExitStatus() == 1 { 51 return nil 52 } 53 return err 54 } 55 56 func main() { 57 flag.Usage = func() { 58 fmt.Fprintf(os.Stderr, "Usage: diff_asm [flag...] [filter...]\n") 59 fmt.Fprintf(os.Stderr, "Filter arguments limit to assembly files which match arguments.\n") 60 fmt.Fprintf(os.Stderr, "If not using a filter, piping to `diffstat` may be useful.\n\n") 61 flag.PrintDefaults() 62 } 63 flag.Parse() 64 65 // Find all the assembly files. 66 var files []string 67 err := filepath.Walk(*boringsslDir, func(path string, info os.FileInfo, err error) error { 68 if err != nil { 69 return nil 70 } 71 72 path, err = filepath.Rel(*boringsslDir, path) 73 if err != nil { 74 return err 75 } 76 77 dir := filepath.Base(filepath.Dir(path)) 78 if !info.IsDir() && (dir == "asm" || dir == "perlasm") && strings.HasSuffix(filepath.Base(path), ".pl") { 79 files = append(files, path) 80 } 81 82 return nil 83 }) 84 if err != nil { 85 fmt.Fprintf(os.Stderr, "Error finding assembly: %s\n", err) 86 os.Exit(1) 87 } 88 89 for _, file := range files { 90 opensslFile := mapName(file) 91 if len(opensslFile) == 0 { 92 continue 93 } 94 95 if flag.NArg() > 0 { 96 var found bool 97 for _, arg := range flag.Args() { 98 if strings.Contains(file, arg) { 99 found = true 100 break 101 } 102 } 103 if !found { 104 continue 105 } 106 } 107 108 if err := diff(filepath.Join(*opensslDir, opensslFile), filepath.Join(*boringsslDir, file)); err != nil { 109 fmt.Fprintf(os.Stderr, "Error comparing %s: %s\n", file, err) 110 os.Exit(1) 111 } 112 } 113 } 114
