1 /* Compute MD5 checksum of files or strings according to the definition
2 of MD5 in RFC 1321 from April 1992.
3 Copyright (C) 1995 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
19 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>. */
27 #include <sys/types.h>
29 #include "long-options.h"
36 /* Most systems do not distinguish between external and internal
37 text representations. */
38 #if UNIX || __UNIX__ || unix || __unix__ || _POSIX_VERSION
39 # define OPENOPTS(BINARY) "r"
42 # define TEXT1TO1 "rb"
46 # define TEXT1TO1 "rb", "ctx=stm"
47 # define TEXTCNVT "r", "ctx=stm"
49 /* The following line is intended to evoke an error.
50 Using #error is not portable enough. */
51 "Cannot determine system type."
54 # define OPENOPTS(BINARY) ((BINARY) != 0 ? TEXT1TO1 : TEXTCNVT)
57 #if _LIBC || STDC_HEADERS
58 # define TOLOWER(c) tolower (c)
60 # define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c))
63 /* Nonzero if any of the files read were the standard input. */
64 static int have_read_stdin;
66 /* With --check, don't generate any output.
67 The exit code indicates success or failure. */
68 static int status_only = 0;
70 /* With --check, print a message to standard error warning about each
71 improperly formatted MD5 checksum line. */
74 /* The name this program was run with. */
77 static const struct option long_options[] =
79 { "binary", no_argument, 0, 'b' },
80 { "check", no_argument, 0, 'c' },
81 { "status", no_argument, 0, 2 },
82 { "string", required_argument, 0, 1 },
83 { "text", no_argument, 0, 't' },
84 { "warn", no_argument, 0, 'w' },
94 fprintf (stderr, _("Try `%s --help' for more information.\n"),
98 Usage: %s [OPTION] [FILE]...\n\
99 or: %s [OPTION] --check [FILE]\n\
100 or: %s [OPTION] --string=STRING ...\n\
101 Print or check MD5 checksums.\n\
102 With no FILE, or when FILE is -, read standard input.\n\
104 -b, --binary read files in binary mode\n\
105 -t, --text read files in text mode (default)\n\
106 -c, --check check MD5 sums against given list\n\
108 The following two options are useful only when verifying checksums:\n\
109 --status don't output anything, status code shows success\n\
110 -w, --warn warn about improperly formated MD5 checksum lines\n\
112 --string=STRING compute checksum for STRING\n\
113 --help display this help and exit\n\
114 --version output version information and exit\n\
116 The sums are computed as described in RFC 1321. When checking, the input\n\
117 should be a former output of this program. The default mode is to print\n\
118 a line with checksum, a character indicating type (`*' for binary, ` ' for\n\
119 text), and name for each FILE. The --status and --warn options are\n\
120 meaningful only when verifying checksums.\n"),
121 program_name, program_name, program_name);
126 /* FIXME: this format loses with filenames containing newline. */
129 split_3 (char *s, char **u, int *binary, char **w)
133 #define ISWHITE(c) ((c) == ' ' || (c) == '\t')
136 while (ISWHITE (s[i]))
139 /* The line has to be at least 35 characters long to contain correct
140 message digest information. */
141 if (strlen (&s[i]) >= 35)
145 /* The first field has to be the 32-character hexadecimal
146 representation of the message digest. If it not immediately
147 followed by a white space it's an error. */
154 if (s[i] != ' ' && s[i] != '*')
156 *binary = s[i++] == '*';
158 /* All characters between the type indicator and end of line are
159 significant -- that includes leading and trailing white space. */
162 /* So this line is valid as long as there is at least one character
164 return (**w ? 0 : 1);
169 /* FIXME: use strcspn. */
172 hex_digits (const char *s)
183 /* FIXME: allow newline in filename by encoding it. */
184 /* FIXME: distinguish between file open/read failure and inconsistent
188 md5_file (const char *filename, int binary, unsigned char *md5_result)
193 if (strcmp (filename, "-") == 0)
200 /* OPENOPTS is a macro. It varies with the system.
201 Some systems distinguish between internal and
202 external text representations. */
204 fp = fopen (filename, OPENOPTS (binary));
207 error (0, errno, "%s", filename);
212 err = md5_stream (fp, md5_result);
215 error (0, errno, "%s", filename);
221 if (fp != stdin && fclose (fp) == EOF)
223 error (0, errno, "%s", filename);
231 md5_check (const char *checkfile_name, int binary)
233 FILE *checkfile_stream;
235 int n_tests_failed = 0;
236 unsigned char md5buffer[16];
239 size_t line_chars_allocated;
241 if (strcmp (checkfile_name, "-") == 0)
244 checkfile_name = _("standard input");
245 checkfile_stream = stdin;
249 checkfile_stream = fopen (checkfile_name, "r");
250 if (checkfile_stream == NULL)
252 error (0, errno, "%s", checkfile_name);
259 line_chars_allocated = 0;
270 line_length = getline (&line, &line_chars_allocated, checkfile_stream);
271 if (line_length <= 0)
274 /* Ignore comment lines, which begin with a '#' character. */
278 /* Remove any trailing newline. */
279 if (line[line_length - 1] == '\n')
280 line[--line_length] = '\0';
282 err = split_3 (line, &md5num, &type_flag, &filename);
283 if (err || !hex_digits (md5num))
288 _("%s: %lu: improperly formatted MD5 checksum line"),
289 checkfile_name, (unsigned long) line_number);
294 static const char bin2hex[] = { '0', '1', '2', '3',
297 'c', 'd', 'e', 'f' };
302 fail = md5_file (filename, binary, md5buffer);
307 /* Compare generated binary number with text representation
308 in check file. Ignore case of hex digits. */
309 for (cnt = 0; cnt < 16; ++cnt)
311 if (TOLOWER (md5num[2 * cnt]) != bin2hex[md5buffer[cnt] >> 4]
312 || (TOLOWER (md5num[2 * cnt + 1])
313 != (bin2hex[md5buffer[cnt] & 0xf])))
325 printf ("%s: %s\n", filename, (fail ? _("FAILED") : _("OK")));
330 while (!feof (checkfile_stream) && !ferror (checkfile_stream));
335 if (ferror (checkfile_stream))
337 error (0, 0, "%s: read error", checkfile_name);
341 if (checkfile_stream != stdin && fclose (checkfile_stream) == EOF)
343 error (0, errno, "%s", checkfile_name);
349 /* Warn if no tests are found. */
350 error (0, 0, _("%s: no properly formatted MD5 checksum lines found"),
357 if (n_tests_failed == 0)
360 ? _("the single computed checksum matched\n")
361 : _("all %d computed checksums matched\n"), n_tests);
366 ? _("WARNING: the single computed checksum did NOT match\n")
367 : _("WARNING: %d out of %d computed checksums did NOT match\n"),
368 n_tests_failed, n_tests);
373 return ((n_tests > 0 && n_tests_failed == 0) ? 0 : 1);
377 main (int argc, char **argv)
379 unsigned char md5buffer[16];
383 char **string = NULL;
388 /* Text is default of the Plumb/Lankester format. */
391 /* Setting values of global variables. */
392 program_name = argv[0];
394 parse_long_options (argc, argv, "md5sum", version_string, usage);
396 while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL))
400 case 0: /* long option */
402 case 1: /* --string */
405 string = (char **) xmalloc ((argc - 1) * sizeof (char *));
409 string[n_strings++] = optarg;
430 usage (EXIT_FAILURE);
435 printf ("md5sum - %s\n", version_string);
439 if (n_strings > 0 && do_check)
442 _("the --string and --check options are mutually exclusive"));
443 usage (EXIT_FAILURE);
446 if (status_only && !do_check)
449 _("the --status option is meaningful only when verifying checksums"));
450 usage (EXIT_FAILURE);
453 if (warn && !do_check)
456 _("the --warn option is meaningful only when verifying checksums"));
457 usage (EXIT_FAILURE);
464 error (0, 0, _("no files may be specified when using --string"));
465 usage (EXIT_FAILURE);
467 for (i = 0; i < n_strings; ++i)
470 md5_buffer (string[i], strlen (string[i]), md5buffer);
472 for (cnt = 0; cnt < 16; ++cnt)
473 printf ("%02x", md5buffer[cnt]);
475 printf (" \"%s\"\n", string[i]);
480 if (optind + 1 < argc)
483 _("only one argument may be specified when using --check"));
484 usage (EXIT_FAILURE);
487 err = md5_check ((optind == argc) ? "-" : argv[optind], binary);
494 for (; optind < argc; ++optind)
499 fail = md5_file (argv[optind], binary, md5buffer);
503 for (i = 0; i < 16; ++i)
504 printf ("%02x", md5buffer[i]);
506 printf (" %c%s\n", binary ? '*' : ' ', argv[optind]);
511 if (fclose (stdout) == EOF)
512 error (EXIT_FAILURE, errno, _("write error"));
514 if (have_read_stdin && fclose (stdin) == EOF)
515 error (EXIT_FAILURE, errno, _("standard input"));
517 exit (err == 0 ? EXIT_SUCCESS : EXIT_FAILURE);