276 lines
8.0 KiB
C
276 lines
8.0 KiB
C
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/*
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Calculate or Check MD5 Signature of File or Command Line Argument
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by John Walker
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http://www.fourmilab.ch/
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This program is in the public domain.
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*/
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#define VERSION "2.2 (2008-01-14)"
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#ifdef _WIN32
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#include <fcntl.h>
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#include <io.h>
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#endif
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#include "md5.h"
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#define FALSE 0
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#define TRUE 1
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#define EOS '\0'
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/* Main program */
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int main(argc, argv)
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int argc; char *argv[];
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{
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int i, j, opt, cdata = FALSE, docheck = FALSE, showfile = TRUE, f = 0;
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unsigned int bp;
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char *cp, *clabel, *ifname, *hexfmt = "%02X";
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FILE *in = stdin, *out = stdout;
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unsigned char buffer[16384], signature[16], csig[16];
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struct MD5Context md5c;
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/* Build parameter quality control. Verify machine
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properties were properly set in md5.h and refuse
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to run if they're not correct. */
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#ifdef CHECK_HARDWARE_PROPERTIES
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/* Verify unit32 is, in fact, a 32 bit data type. */
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if (sizeof(uint32) != 4) {
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fprintf(stderr, "** Configuration error. Setting for uint32 in file md5.h\n");
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fprintf(stderr, " is incorrect. This must be a 32 bit data type, but it\n");
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fprintf(stderr, " is configured as a %d bit data type.\n", sizeof(uint32) * 8);
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return 2;
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}
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/* If HIGHFIRST is not defined, verify that this machine is,
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in fact, a little-endian architecture. */
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#ifndef HIGHFIRST
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{ uint32 t = 0x12345678;
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if (*((char *) &t) != 0x78) {
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fprintf(stderr, "** Configuration error. Setting for HIGHFIRST in file md5.h\n");
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fprintf(stderr, " is incorrect. This symbol has not been defined, yet this\n");
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fprintf(stderr, " machine is a big-endian (most significant byte first in\n");
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fprintf(stderr, " memory) architecture. Please modify md5.h so HIGHFIRST is\n");
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fprintf(stderr, " defined when building for this machine.\n");
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return 2;
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}
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}
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#endif
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#endif
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/* Process command line options. */
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for (i = 1; i < argc; i++) {
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cp = argv[i];
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if (*cp == '-') {
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if (strlen(cp) == 1) {
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i++;
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break; /* - -- Mark end of options; balance are files */
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}
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opt = *(++cp);
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if (islower(opt)) {
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opt = toupper(opt);
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}
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switch (opt) {
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case 'C': /* -Csignature -- Check signature, set return code */
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docheck = TRUE;
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if (strlen(cp + 1) != 32) {
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docheck = FALSE;
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}
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memset(csig, 0, 16);
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clabel = cp + 1;
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for (j = 0; j < 16; j++) {
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if (isxdigit((int) clabel[0]) && isxdigit((int) clabel[1]) &&
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sscanf((cp + 1 + (j * 2)), hexfmt, &bp) == 1) {
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csig[j] = (unsigned char) bp;
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} else {
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docheck = FALSE;
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break;
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}
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clabel += 2;
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}
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if (!docheck) {
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fprintf(stderr, "Error in signature specification. Must be 32 hex digits.\n");
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return 2;
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}
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break;
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case 'D': /* -Dtext -- Compute signature of given text */
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MD5Init(&md5c);
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MD5Update(&md5c, (unsigned char *) (cp + 1), strlen(cp + 1));
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cdata = TRUE;
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f++; /* Mark no infile argument needed */
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break;
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case 'L': /* -L -- Use lower case letters as hex digits */
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hexfmt = "%02x";
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break;
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case 'N': /* -N -- Don't show file name after sum */
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showfile = FALSE;
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break;
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case 'O': /* -Ofname -- Write output to fname (- = stdout) */
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cp++;
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if (strcmp(cp, "-") != 0) {
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if (out != stdout) {
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fprintf(stderr, "Redundant output file specification.\n");
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return 2;
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}
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if ((out = fopen(cp, "w")) == NULL) {
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fprintf(stderr, "Cannot open output file %s\n", cp);
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return 2;
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}
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}
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break;
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case '?': /* -U, -? -H -- Print how to call information. */
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case 'H':
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case 'U':
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printf("\nMD5 -- Calculate MD5 signature of file. Call");
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printf("\n with md5 [ options ] [file ...]");
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printf("\n");
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printf("\n Options:");
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printf("\n -csig Check against sig, set exit status 0 = OK");
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printf("\n -dtext Compute signature of text argument");
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printf("\n -l Use lower case letters for hexadecimal digits");
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printf("\n -n Do not show file name after sum");
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printf("\n -ofname Write output to fname (- = stdout)");
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printf("\n -u Print this message");
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printf("\n -v Print version information");
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printf("\n");
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printf("\nby John Walker -- http://www.fourmilab.ch/");
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printf("\nVersion %s\n", VERSION);
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printf("\nThis program is in the public domain.\n");
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printf("\n");
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#ifdef CHECK_HARDWARE_PROPERTIES
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#ifdef HIGHFIRST
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{ uint32 t = 0x12345678;
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if (*((char *) &t) == 0x78) {
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fprintf(stderr, "** Note. md5 is not optimally configured for use on this\n");
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fprintf(stderr, " machine. This is a little-endian (least significant byte\n");
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fprintf(stderr, " first in memory) architecture, yet md5 has been built with the\n");
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fprintf(stderr, " symbol HIGHFIRST defined in md5.h, which includes code which\n");
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fprintf(stderr, " supports both big- and little-endian machines. Modifying\n");
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fprintf(stderr, " md5.h to undefine HIGHFIRST for this platform will make md5\n");
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fprintf(stderr, " run faster on it.\n");
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}
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}
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#endif
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#endif
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return 0;
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case 'V': /* -V -- Print version number */
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printf("%s\n", VERSION);
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return 0;
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}
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} else {
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break;
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}
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}
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if (cdata && (i < argc)) {
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fprintf(stderr, "Cannot specify both -d option and input file.\n");
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return 2;
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}
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if ((i >= argc) && (f == 0)) {
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f++;
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}
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for (; (f > 0) || (i < argc); i++) {
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if ((!cdata) && (f > 0)) {
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ifname = "-";
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} else {
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ifname = argv[i];
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}
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f = 0;
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if (!cdata) {
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int opened = FALSE;
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/* If the data weren't supplied on the command line with
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the "-d" option, read it now from the input file. */
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if (strcmp(ifname, "-") != 0) {
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if ((in = fopen(ifname, "rb")) == NULL) {
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fprintf(stderr, "Cannot open input file %s\n", ifname);
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return 2;
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}
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opened = TRUE;
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} else {
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in = stdin;
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}
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#ifdef _WIN32
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/** Warning! On systems which distinguish text mode and
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binary I/O (MS-DOS, Macintosh, etc.) the modes in the open
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statement for "in" should have forced the input file into
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binary mode. But what if we're reading from standard
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input? Well, then we need to do a system-specific tweak
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to make sure it's in binary mode. While we're at it,
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let's set the mode to binary regardless of however fopen
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set it.
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The following code, conditional on _WIN32, sets binary
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mode using the method prescribed by Microsoft Visual C 7.0
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("Monkey C"); this may require modification if you're
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using a different compiler or release of Monkey C. If
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you're porting this code to a different system which
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distinguishes text and binary files, you'll need to add
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the equivalent call for that system. */
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_setmode(_fileno(in), _O_BINARY);
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#endif
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MD5Init(&md5c);
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while ((j = (int) fread(buffer, 1, sizeof buffer, in)) > 0) {
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MD5Update(&md5c, buffer, (unsigned) j);
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}
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if (opened) {
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fclose(in);
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}
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}
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MD5Final(signature, &md5c);
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if (docheck) {
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docheck = 0;
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for (j = 0; j < sizeof signature; j++) {
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if (signature[j] != csig[j]) {
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docheck = 1;
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break;
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}
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}
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if (i < (argc - 1)) {
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fprintf(stderr, "Only one file may be tested with the -c option.\n");
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return 2;
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}
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} else {
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for (j = 0; j < sizeof signature; j++) {
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fprintf(out, hexfmt, signature[j]);
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}
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if ((!cdata) && showfile) {
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fprintf(out, " %s", (in == stdin) ? "-" : ifname);
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}
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fprintf(out, "\n");
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}
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}
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return docheck;
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}
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