1 /* Compute MD5, SHA1, SHA224, SHA256, SHA384 or SHA512 checksum of files or strings
2 Copyright (C) 1995-2008 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>. */
22 #include <sys/types.h>
32 #if HASH_ALGO_SHA256 || HASH_ALGO_SHA224
35 #if HASH_ALGO_SHA512 || HASH_ALGO_SHA384
41 /* The official name of this program (e.g., no `g' prefix). */
43 # define PROGRAM_NAME "md5sum"
44 # define DIGEST_TYPE_STRING "MD5"
45 # define DIGEST_STREAM md5_stream
46 # define DIGEST_BITS 128
47 # define DIGEST_REFERENCE "RFC 1321"
48 # define DIGEST_ALIGN 4
50 # define PROGRAM_NAME "sha1sum"
51 # define DIGEST_TYPE_STRING "SHA1"
52 # define DIGEST_STREAM sha1_stream
53 # define DIGEST_BITS 160
54 # define DIGEST_REFERENCE "FIPS-180-1"
55 # define DIGEST_ALIGN 4
56 #elif HASH_ALGO_SHA256
57 # define PROGRAM_NAME "sha256sum"
58 # define DIGEST_TYPE_STRING "SHA256"
59 # define DIGEST_STREAM sha256_stream
60 # define DIGEST_BITS 256
61 # define DIGEST_REFERENCE "FIPS-180-2"
62 # define DIGEST_ALIGN 4
63 #elif HASH_ALGO_SHA224
64 # define PROGRAM_NAME "sha224sum"
65 # define DIGEST_TYPE_STRING "SHA224"
66 # define DIGEST_STREAM sha224_stream
67 # define DIGEST_BITS 224
68 # define DIGEST_REFERENCE "RFC 3874"
69 # define DIGEST_ALIGN 4
70 #elif HASH_ALGO_SHA512
71 # define PROGRAM_NAME "sha512sum"
72 # define DIGEST_TYPE_STRING "SHA512"
73 # define DIGEST_STREAM sha512_stream
74 # define DIGEST_BITS 512
75 # define DIGEST_REFERENCE "FIPS-180-2"
76 # define DIGEST_ALIGN 8
77 #elif HASH_ALGO_SHA384
78 # define PROGRAM_NAME "sha384sum"
79 # define DIGEST_TYPE_STRING "SHA384"
80 # define DIGEST_STREAM sha384_stream
81 # define DIGEST_BITS 384
82 # define DIGEST_REFERENCE "FIPS-180-2"
83 # define DIGEST_ALIGN 8
85 # error "Can't decide which hash algorithm to compile."
88 #define DIGEST_HEX_BYTES (DIGEST_BITS / 4)
89 #define DIGEST_BIN_BYTES (DIGEST_BITS / 8)
91 #define AUTHORS "Ulrich Drepper", "Scott Miller", "David Madore"
93 /* The minimum length of a valid digest line. This length does
94 not include any newline character at the end of a line. */
95 #define MIN_DIGEST_LINE_LENGTH \
96 (DIGEST_HEX_BYTES /* length of hexadecimal message digest */ \
97 + 2 /* blank and binary indicator */ \
98 + 1 /* minimum filename length */ )
100 /* True if any of the files read were the standard input. */
101 static bool have_read_stdin;
103 /* The minimum length of a valid checksum line for the selected algorithm. */
104 static size_t min_digest_line_length;
106 /* Set to the length of a digest hex string for the selected algorithm. */
107 static size_t digest_hex_bytes;
109 /* With --check, don't generate any output.
110 The exit code indicates success or failure. */
111 static bool status_only = false;
113 /* With --check, print a message to standard error warning about each
114 improperly formatted checksum line. */
115 static bool warn = false;
117 /* The name this program was run with. */
120 /* For long options that have no equivalent short option, use a
121 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
124 STATUS_OPTION = CHAR_MAX + 1
127 static const struct option long_options[] =
129 { "binary", no_argument, NULL, 'b' },
130 { "check", no_argument, NULL, 'c' },
131 { "status", no_argument, NULL, STATUS_OPTION },
132 { "text", no_argument, NULL, 't' },
133 { "warn", no_argument, NULL, 'w' },
134 { GETOPT_HELP_OPTION_DECL },
135 { GETOPT_VERSION_OPTION_DECL },
142 if (status != EXIT_SUCCESS)
143 fprintf (stderr, _("Try `%s --help' for more information.\n"),
148 Usage: %s [OPTION] [FILE]...\n\
149 Print or check %s (%d-bit) checksums.\n\
150 With no FILE, or when FILE is -, read standard input.\n\
158 -b, --binary read in binary mode (default unless reading tty stdin)\n\
162 -b, --binary read in binary mode\n\
165 -c, --check read %s sums from the FILEs and check them\n"),
169 -t, --text read in text mode (default if reading tty stdin)\n\
173 -t, --text read in text mode (default)\n\
177 The following two options are useful only when verifying checksums:\n\
178 --status don't output anything, status code shows success\n\
179 -w, --warn warn about improperly formatted checksum lines\n\
182 fputs (HELP_OPTION_DESCRIPTION, stdout);
183 fputs (VERSION_OPTION_DESCRIPTION, stdout);
186 The sums are computed as described in %s. When checking, the input\n\
187 should be a former output of this program. The default mode is to print\n\
188 a line with checksum, a character indicating type (`*' for binary, ` ' for\n\
189 text), and name for each FILE.\n"),
191 emit_bug_reporting_address ();
197 #define ISWHITE(c) ((c) == ' ' || (c) == '\t')
199 /* Split the checksum string S (of length S_LEN) from a BSD 'md5' or
200 'sha1' command into two parts: a hexadecimal digest, and the file
201 name. S is modified. Return true if successful. */
204 bsd_split_3 (char *s, size_t s_len, unsigned char **hex_digest, char **file_name)
213 /* Find end of filename. The BSD 'md5' and 'sha1' commands do not escape
214 filenames, so search backwards for the last ')'. */
216 while (i && s[i] != ')')
224 while (ISWHITE (s[i]))
232 while (ISWHITE (s[i]))
235 *hex_digest = (unsigned char *) &s[i];
239 /* Split the string S (of length S_LEN) into three parts:
240 a hexadecimal digest, binary flag, and the file name.
241 S is modified. Return true if successful. */
244 split_3 (char *s, size_t s_len,
245 unsigned char **hex_digest, int *binary, char **file_name)
248 bool escaped_filename = false;
249 size_t algo_name_len;
252 while (ISWHITE (s[i]))
255 /* Check for BSD-style checksum line. */
256 algo_name_len = strlen (DIGEST_TYPE_STRING);
257 if (strncmp (s + i, DIGEST_TYPE_STRING, algo_name_len) == 0)
259 if (strncmp (s + i + algo_name_len, " (", 2) == 0)
262 return bsd_split_3 (s + i + algo_name_len + 2,
263 s_len - (i + algo_name_len + 2),
264 hex_digest, file_name);
268 /* Ignore this line if it is too short.
269 Each line must have at least `min_digest_line_length - 1' (or one more, if
270 the first is a backslash) more characters to contain correct message digest
272 if (s_len - i < min_digest_line_length + (s[i] == '\\'))
278 escaped_filename = true;
280 *hex_digest = (unsigned char *) &s[i];
282 /* The first field has to be the n-character hexadecimal
283 representation of the message digest. If it is not followed
284 immediately by a white space it's an error. */
285 i += digest_hex_bytes;
291 if (s[i] != ' ' && s[i] != '*')
293 *binary = (s[i++] == '*');
295 /* All characters between the type indicator and end of line are
296 significant -- that includes leading and trailing white space. */
299 if (escaped_filename)
301 /* Translate each `\n' string in the file name to a NEWLINE,
302 and each `\\' string to a backslash. */
313 /* A valid line does not end with a backslash. */
326 /* Only `\' or `n' may follow a backslash. */
332 /* The file name may not contain a NUL. */
346 /* Return true if S is a NUL-terminated string of DIGEST_HEX_BYTES hex digits.
347 Otherwise, return false. */
349 hex_digits (unsigned char const *s)
352 for (i = 0; i < digest_hex_bytes; i++)
361 /* An interface to the function, DIGEST_STREAM.
362 Operate on FILENAME (it may be "-").
364 *BINARY indicates whether the file is binary. BINARY < 0 means it
365 depends on whether binary mode makes any difference and the file is
366 a terminal; in that case, clear *BINARY if the file was treated as
367 text because it was a terminal.
369 Put the checksum in *BIN_RESULT, which must be properly aligned.
370 Return true if successful. */
373 digest_file (const char *filename, int *binary, unsigned char *bin_result)
377 bool is_stdin = STREQ (filename, "-");
381 have_read_stdin = true;
383 if (O_BINARY && *binary)
386 *binary = ! isatty (STDIN_FILENO);
388 freopen (NULL, "rb", stdin);
393 fp = fopen (filename, (O_BINARY && *binary ? "rb" : "r"));
396 error (0, errno, "%s", filename);
401 err = DIGEST_STREAM (fp, bin_result);
404 error (0, errno, "%s", filename);
410 if (!is_stdin && fclose (fp) != 0)
412 error (0, errno, "%s", filename);
420 digest_check (const char *checkfile_name)
422 FILE *checkfile_stream;
423 uintmax_t n_properly_formatted_lines = 0;
424 uintmax_t n_mismatched_checksums = 0;
425 uintmax_t n_open_or_read_failures = 0;
426 unsigned char bin_buffer_unaligned[DIGEST_BIN_BYTES + DIGEST_ALIGN];
427 /* Make sure bin_buffer is properly aligned. */
428 unsigned char *bin_buffer = ptr_align (bin_buffer_unaligned, DIGEST_ALIGN);
429 uintmax_t line_number;
431 size_t line_chars_allocated;
432 bool is_stdin = STREQ (checkfile_name, "-");
436 have_read_stdin = true;
437 checkfile_name = _("standard input");
438 checkfile_stream = stdin;
442 checkfile_stream = fopen (checkfile_name, "r");
443 if (checkfile_stream == NULL)
445 error (0, errno, "%s", checkfile_name);
452 line_chars_allocated = 0;
455 char *filename IF_LINT (= NULL);
457 unsigned char *hex_digest IF_LINT (= NULL);
461 if (line_number == 0)
462 error (EXIT_FAILURE, 0, _("%s: too many checksum lines"),
465 line_length = getline (&line, &line_chars_allocated, checkfile_stream);
466 if (line_length <= 0)
469 /* Ignore comment lines, which begin with a '#' character. */
473 /* Remove any trailing newline. */
474 if (line[line_length - 1] == '\n')
475 line[--line_length] = '\0';
477 if (! (split_3 (line, line_length, &hex_digest, &binary, &filename)
478 && ! (is_stdin && STREQ (filename, "-"))
479 && hex_digits (hex_digest)))
485 ": improperly formatted %s checksum line"),
486 checkfile_name, line_number,
492 static const char bin2hex[] = { '0', '1', '2', '3',
495 'c', 'd', 'e', 'f' };
498 ++n_properly_formatted_lines;
500 ok = digest_file (filename, &binary, bin_buffer);
504 ++n_open_or_read_failures;
507 printf (_("%s: FAILED open or read\n"), filename);
513 size_t digest_bin_bytes = digest_hex_bytes / 2;
515 /* Compare generated binary number with text representation
516 in check file. Ignore case of hex digits. */
517 for (cnt = 0; cnt < digest_bin_bytes; ++cnt)
519 if (tolower (hex_digest[2 * cnt])
520 != bin2hex[bin_buffer[cnt] >> 4]
521 || (tolower (hex_digest[2 * cnt + 1])
522 != (bin2hex[bin_buffer[cnt] & 0xf])))
525 if (cnt != digest_bin_bytes)
526 ++n_mismatched_checksums;
530 printf ("%s: %s\n", filename,
531 (cnt != digest_bin_bytes ? _("FAILED") : _("OK")));
537 while (!feof (checkfile_stream) && !ferror (checkfile_stream));
541 if (ferror (checkfile_stream))
543 error (0, 0, _("%s: read error"), checkfile_name);
547 if (!is_stdin && fclose (checkfile_stream) != 0)
549 error (0, errno, "%s", checkfile_name);
553 if (n_properly_formatted_lines == 0)
555 /* Warn if no tests are found. */
556 error (0, 0, _("%s: no properly formatted %s checksum lines found"),
557 checkfile_name, DIGEST_TYPE_STRING);
563 if (n_open_or_read_failures != 0)
565 ngettext ("WARNING: %" PRIuMAX " of %" PRIuMAX
566 " listed file could not be read",
567 "WARNING: %" PRIuMAX " of %" PRIuMAX
568 " listed files could not be read",
569 select_plural (n_properly_formatted_lines)),
570 n_open_or_read_failures, n_properly_formatted_lines);
572 if (n_mismatched_checksums != 0)
574 uintmax_t n_computed_checksums =
575 (n_properly_formatted_lines - n_open_or_read_failures);
577 ngettext ("WARNING: %" PRIuMAX " of %" PRIuMAX
578 " computed checksum did NOT match",
579 "WARNING: %" PRIuMAX " of %" PRIuMAX
580 " computed checksums did NOT match",
581 select_plural (n_computed_checksums)),
582 n_mismatched_checksums, n_computed_checksums);
587 return (n_properly_formatted_lines != 0
588 && n_mismatched_checksums == 0
589 && n_open_or_read_failures == 0);
593 main (int argc, char **argv)
595 unsigned char bin_buffer_unaligned[DIGEST_BIN_BYTES + DIGEST_ALIGN];
596 /* Make sure bin_buffer is properly aligned. */
597 unsigned char *bin_buffer = ptr_align (bin_buffer_unaligned, DIGEST_ALIGN);
598 bool do_check = false;
603 /* Setting values of global variables. */
604 initialize_main (&argc, &argv);
605 program_name = argv[0];
606 setlocale (LC_ALL, "");
607 bindtextdomain (PACKAGE, LOCALEDIR);
608 textdomain (PACKAGE);
610 atexit (close_stdout);
612 while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL)) != -1)
632 case_GETOPT_HELP_CHAR;
633 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
635 usage (EXIT_FAILURE);
638 min_digest_line_length = MIN_DIGEST_LINE_LENGTH;
639 digest_hex_bytes = DIGEST_HEX_BYTES;
641 if (0 <= binary && do_check)
643 error (0, 0, _("the --binary and --text options are meaningless when "
644 "verifying checksums"));
645 usage (EXIT_FAILURE);
648 if (status_only & !do_check)
651 _("the --status option is meaningful only when verifying checksums"));
652 usage (EXIT_FAILURE);
655 if (warn & !do_check)
658 _("the --warn option is meaningful only when verifying checksums"));
659 usage (EXIT_FAILURE);
662 if (!O_BINARY && binary < 0)
668 for (; optind < argc; ++optind)
670 char *file = argv[optind];
673 ok &= digest_check (file);
676 int file_is_binary = binary;
678 if (! digest_file (file, &file_is_binary, bin_buffer))
684 /* Output a leading backslash if the file name contains
685 a newline or backslash. */
686 if (strchr (file, '\n') || strchr (file, '\\'))
689 for (i = 0; i < (digest_hex_bytes / 2); ++i)
690 printf ("%02x", bin_buffer[i]);
698 /* Translate each NEWLINE byte to the string, "\\n",
699 and each backslash to "\\\\". */
700 for (i = 0; i < strlen (file); ++i)
705 fputs ("\\n", stdout);
709 fputs ("\\\\", stdout);
722 if (have_read_stdin && fclose (stdin) == EOF)
723 error (EXIT_FAILURE, errno, _("standard input"));
725 exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);