1 /* Compute MD5 or SHA1 checksum of files or strings
2 Copyright (C) 1995-2001 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 2, or (at your option)
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, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>. */
24 #include <sys/types.h>
35 /* The official name of this program (e.g., no `g' prefix). */
36 #define PROGRAM_NAME (algorithm == ALG_MD5 ? "md5sum" : "shasum")
38 #define AUTHORS N_ ("Ulrich Drepper and Scott Miller")
40 /* Most systems do not distinguish between external and internal
41 text representations. */
42 /* FIXME: This begs for an autoconf test. */
44 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
45 # define TEXT1TO1 "rb"
49 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
50 # define TEXT1TO1 "rb", "ctx=stm"
51 # define TEXTCNVT "r", "ctx=stm"
53 # if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
54 # define OPENOPTS(BINARY) "r"
56 /* The following line is intended to evoke an error.
57 Using #error is not portable enough. */
58 "Cannot determine system type."
64 #define DIGEST_TYPE_STRING(Alg) ((Alg) == ALG_MD5 ? "MD5" : "SHA1")
65 #define DIGEST_STREAM(Alg) ((Alg) == ALG_MD5 ? md5_stream : sha_stream)
67 #define DIGEST_BITS(Alg) ((Alg) == ALG_MD5 ? 128 : 160)
68 #define DIGEST_HEX_BYTES(Alg) (DIGEST_BITS (Alg) / 4)
69 #define DIGEST_BIN_BYTES(Alg) (DIGEST_BITS (Alg) / 8)
71 #define MAX_DIGEST_BIN_BYTES MAX (DIGEST_BIN_BYTES (ALG_MD5), \
72 DIGEST_BIN_BYTES (ALG_SHA1))
74 /* The minimum length of a valid digest line. This length does
75 not include any newline character at the end of a line. */
76 #define MIN_DIGEST_LINE_LENGTH(Alg) \
77 (DIGEST_HEX_BYTES (Alg) /* length of hexadecimal message digest */ \
78 + 2 /* blank and binary indicator */ \
79 + 1 /* minimum filename length */ )
81 /* Nonzero if any of the files read were the standard input. */
82 static int have_read_stdin;
84 /* The minimum length of a valid checksum line for the selected algorithm. */
85 static int min_digest_line_length;
87 /* Set to the length of a digest hex string for the selected algorithm. */
88 static size_t digest_hex_bytes;
90 /* With --check, don't generate any output.
91 The exit code indicates success or failure. */
92 static int status_only = 0;
94 /* With --check, print a message to standard error warning about each
95 improperly formatted checksum line. */
98 /* Declared and set via one of the wrapper .c files. */
99 /* int algorithm = ALG_UNSPECIFIED; */
101 /* The name this program was run with. */
104 static const struct option long_options[] =
106 { "binary", no_argument, 0, 'b' },
107 { "check", no_argument, 0, 'c' },
108 { "status", no_argument, 0, 2 },
109 { "string", required_argument, 0, 1 },
110 { "text", no_argument, 0, 't' },
111 { "warn", no_argument, 0, 'w' },
112 { GETOPT_HELP_OPTION_DECL },
113 { GETOPT_VERSION_OPTION_DECL },
121 fprintf (stderr, _("Try `%s --help' for more information.\n"),
126 Usage: %s [OPTION] [FILE]...\n\
127 or: %s [OPTION] --check [FILE]\n\
128 Print or check %s (%d-bit) checksums.\n\
129 With no FILE, or when FILE is -, read standard input.\n\
131 program_name, program_name,
132 DIGEST_TYPE_STRING (algorithm),
133 DIGEST_BITS (algorithm));
136 -b, --binary read files in binary mode (default on DOS/Windows)\n\
137 -c, --check check %s sums against given list\n\
138 -t, --text read files in text mode (default)\n\
141 DIGEST_TYPE_STRING (algorithm));
143 The following two options are useful only when verifying checksums:\n\
144 --status don't output anything, status code shows success\n\
145 -w, --warn warn about improperly formated checksum lines\n\
148 fputs (HELP_OPTION_DESCRIPTION, stdout);
149 fputs (VERSION_OPTION_DESCRIPTION, stdout);
154 The sums are computed as described in %s. When checking, the input\n\
155 should be a former output of this program. The default mode is to print\n\
156 a line with checksum, a character indicating type (`*' for binary, ` ' for\n\
157 text), and name for each FILE.\n"),
158 (algorithm == ALG_MD5 ? "RFC 1321" : "FIPS-180-1"));
159 puts (_("\nReport bugs to <bug-textutils@gnu.org>."));
162 exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
166 split_3 (char *s, size_t s_len, unsigned char **u, int *binary, char **w)
169 int escaped_filename = 0;
171 #define ISWHITE(c) ((c) == ' ' || (c) == '\t')
174 while (ISWHITE (s[i]))
177 /* The line must have at least `min_digest_line_length - 1' (or one more, if
178 the first is a backslash) more characters to contain correct message digest
179 information. Ignore this line if it is too short. */
180 if (!(s_len - i >= min_digest_line_length
181 || (s[i] == '\\' && s_len - i >= 1 + min_digest_line_length)))
187 escaped_filename = 1;
189 *u = (unsigned char *) &s[i];
191 /* The first field has to be the n-character hexadecimal
192 representation of the message digest. If it is not followed
193 immediately by a white space it's an error. */
194 i += digest_hex_bytes;
200 if (s[i] != ' ' && s[i] != '*')
202 *binary = (s[i++] == '*');
204 /* All characters between the type indicator and end of line are
205 significant -- that includes leading and trailing white space. */
208 if (escaped_filename)
210 /* Translate each `\n' string in the file name to a NEWLINE,
211 and each `\\' string to a backslash. */
222 /* A valid line does not end with a backslash. */
235 /* Only `\' or `n' may follow a backslash. */
241 /* The file name may not contain a NUL. */
256 hex_digits (unsigned char const *s)
267 /* An interface to the function, DIGEST_STREAM, (either md5_stream or sha_stream).
268 Operate on FILENAME (it may be "-") and put the result in *BIN_RESULT.
269 Return non-zero upon failure, zero to indicate success. */
272 digest_file (const char *filename, int binary, unsigned char *bin_result,
273 int (*digest_stream)(FILE *, void *))
278 if (STREQ (filename, "-"))
283 /* If we need binary reads from a pipe or redirected stdin, we need
284 to switch it to BINARY mode here, since stdin is already open. */
286 SET_BINARY (fileno (stdin));
291 /* OPENOPTS is a macro. It varies with the system.
292 Some systems distinguish between internal and
293 external text representations. */
295 fp = fopen (filename, OPENOPTS (binary));
298 error (0, errno, "%s", filename);
303 err = (*digest_stream) (fp, bin_result);
306 error (0, errno, "%s", filename);
312 if (fp != stdin && fclose (fp) == EOF)
314 error (0, errno, "%s", filename);
322 digest_check (const char *checkfile_name, int (*digest_stream)(FILE *, void *))
324 FILE *checkfile_stream;
325 int n_properly_formated_lines = 0;
326 int n_mismatched_checksums = 0;
327 int n_open_or_read_failures = 0;
328 unsigned char bin_buffer[MAX_DIGEST_BIN_BYTES];
331 size_t line_chars_allocated;
333 if (STREQ (checkfile_name, "-"))
336 checkfile_name = _("standard input");
337 checkfile_stream = stdin;
341 checkfile_stream = fopen (checkfile_name, "r");
342 if (checkfile_stream == NULL)
344 error (0, errno, "%s", checkfile_name);
349 SET_MODE (fileno (checkfile_stream), O_TEXT);
352 line_chars_allocated = 0;
357 unsigned char *hex_digest;
363 line_length = getline (&line, &line_chars_allocated, checkfile_stream);
364 if (line_length <= 0)
367 /* Ignore comment lines, which begin with a '#' character. */
371 /* Remove any trailing newline. */
372 if (line[line_length - 1] == '\n')
373 line[--line_length] = '\0';
375 err = split_3 (line, line_length, &hex_digest, &binary, &filename);
376 if (err || !hex_digits (hex_digest))
381 _("%s: %lu: improperly formatted %s checksum line"),
382 checkfile_name, (unsigned long) line_number,
383 DIGEST_TYPE_STRING (algorithm));
388 static const char bin2hex[] = { '0', '1', '2', '3',
391 'c', 'd', 'e', 'f' };
394 ++n_properly_formated_lines;
396 fail = digest_file (filename, binary, bin_buffer, digest_stream);
400 ++n_open_or_read_failures;
403 printf (_("%s: FAILED open or read\n"), filename);
409 size_t digest_bin_bytes = digest_hex_bytes / 2;
411 /* Compare generated binary number with text representation
412 in check file. Ignore case of hex digits. */
413 for (cnt = 0; cnt < digest_bin_bytes; ++cnt)
415 if (TOLOWER (hex_digest[2 * cnt]) != bin2hex[bin_buffer[cnt] >> 4]
416 || (TOLOWER (hex_digest[2 * cnt + 1])
417 != (bin2hex[bin_buffer[cnt] & 0xf])))
420 if (cnt != digest_bin_bytes)
421 ++n_mismatched_checksums;
425 printf ("%s: %s\n", filename,
426 (cnt != digest_bin_bytes ? _("FAILED") : _("OK")));
432 while (!feof (checkfile_stream) && !ferror (checkfile_stream));
437 if (ferror (checkfile_stream))
439 error (0, 0, _("%s: read error"), checkfile_name);
443 if (checkfile_stream != stdin && fclose (checkfile_stream) == EOF)
445 error (0, errno, "%s", checkfile_name);
449 if (n_properly_formated_lines == 0)
451 /* Warn if no tests are found. */
452 error (0, 0, _("%s: no properly formatted %s checksum lines found"),
453 checkfile_name, DIGEST_TYPE_STRING (algorithm));
459 int n_computed_checkums = (n_properly_formated_lines
460 - n_open_or_read_failures);
462 if (n_open_or_read_failures > 0)
465 _("WARNING: %d of %d listed %s could not be read"),
466 n_open_or_read_failures, n_properly_formated_lines,
467 (n_properly_formated_lines == 1
468 ? _("file") : _("files")));
471 if (n_mismatched_checksums > 0)
474 _("WARNING: %d of %d computed %s did NOT match"),
475 n_mismatched_checksums, n_computed_checkums,
476 (n_computed_checkums == 1
477 ? _("checksum") : _("checksums")));
482 return ((n_properly_formated_lines > 0 && n_mismatched_checksums == 0
483 && n_open_or_read_failures == 0) ? 0 : 1);
487 main (int argc, char **argv)
489 unsigned char bin_buffer[MAX_DIGEST_BIN_BYTES];
492 char **string = NULL;
493 size_t n_strings = 0;
495 int file_type_specified = 0;
498 /* Binary is default on MSDOS, so the actual file contents
499 are used in computation. */
502 /* Text is default of the Plumb/Lankester format. */
506 /* Setting values of global variables. */
507 program_name = argv[0];
508 setlocale (LC_ALL, "");
509 bindtextdomain (PACKAGE, LOCALEDIR);
510 textdomain (PACKAGE);
512 atexit (close_stdout);
514 while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL)) != -1)
517 case 0: /* long option */
519 case 1: /* --string */
522 string = (char **) xmalloc ((argc - 1) * sizeof (char *));
526 string[n_strings++] = optarg;
530 file_type_specified = 1;
541 file_type_specified = 1;
548 case_GETOPT_HELP_CHAR;
549 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
551 usage (EXIT_FAILURE);
554 min_digest_line_length = MIN_DIGEST_LINE_LENGTH (algorithm);
555 digest_hex_bytes = DIGEST_HEX_BYTES (algorithm);
557 if (file_type_specified && do_check)
559 error (0, 0, _("the --binary and --text options are meaningless when \
560 verifying checksums"));
561 usage (EXIT_FAILURE);
564 if (n_strings > 0 && do_check)
567 _("the --string and --check options are mutually exclusive"));
568 usage (EXIT_FAILURE);
571 if (status_only && !do_check)
574 _("the --status option is meaningful only when verifying checksums"));
575 usage (EXIT_FAILURE);
578 if (warn && !do_check)
581 _("the --warn option is meaningful only when verifying checksums"));
582 usage (EXIT_FAILURE);
591 error (0, 0, _("no files may be specified when using --string"));
592 usage (EXIT_FAILURE);
594 for (i = 0; i < n_strings; ++i)
597 if (algorithm == ALG_MD5)
598 md5_buffer (string[i], strlen (string[i]), bin_buffer);
600 sha_buffer (string[i], strlen (string[i]), bin_buffer);
602 for (cnt = 0; cnt < (digest_hex_bytes / 2); ++cnt)
603 printf ("%02x", bin_buffer[cnt]);
605 printf (" \"%s\"\n", string[i]);
610 if (optind + 1 < argc)
613 _("only one argument may be specified when using --check"));
614 usage (EXIT_FAILURE);
617 err = digest_check ((optind == argc) ? "-" : argv[optind],
618 DIGEST_STREAM (algorithm));
625 for (; optind < argc; ++optind)
628 char *file = argv[optind];
630 fail = digest_file (file, binary, bin_buffer,
631 DIGEST_STREAM (algorithm));
637 /* Output a leading backslash if the file name contains
638 a newline or backslash. */
639 if (strchr (file, '\n') || strchr (file, '\\'))
642 for (i = 0; i < (digest_hex_bytes / 2); ++i)
643 printf ("%02x", bin_buffer[i]);
651 /* Translate each NEWLINE byte to the string, "\\n",
652 and each backslash to "\\\\". */
653 for (i = 0; i < strlen (file); ++i)
658 fputs ("\\n", stdout);
662 fputs ("\\\\", stdout);
675 if (have_read_stdin && fclose (stdin) == EOF)
676 error (EXIT_FAILURE, errno, _("standard input"));
678 exit (err == 0 ? EXIT_SUCCESS : EXIT_FAILURE);