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/*++
* NAME
* md5 1
* SUMMARY
* compute MD5 signatures
* SYNOPSIS
* \fBmd5\fR \fIfile(s)\fR ...
* DESCRIPTION
* \fBmd5\fR opens the named \fIfile(s)\fR in order (standard
* input by default) and computes the md5 checksum for each file.
*
* The output format is one line per file with the checksum and
* corresponding file name separated by whitespace (no file name
* is emitted when reading from standard input).
*
* This program has a somewhat easier to parse output format
* than the \fBmd5\fR utility found on some UNIX systems.
* AUTHOR(S)
* Wietse Venema
* This program is part of SATAN.
*
* The MD5 implementation used by this program is placed in the
* public domain for free general use by RSA Data Security.
*--*/
#include <stdio.h>
#include "tsk/libtsk.h"
#define MD5_HASH_LENGTH 16
int
main(argc, argv)
int argc;
char **argv;
{
char *myname = argv[0];
char *crunch();
if (argc < 2) {
printf("%s\n", crunch(stdin));
}
else {
while (--argc && *++argv) {
FILE *fp;
if ((fp = fopen(*argv, "r")) == 0) {
fprintf(stderr, "%s: ", myname);
perror(*argv);
return (1);
}
printf("%s %s\n", crunch(fp), *argv);
fclose(fp);
}
}
return (0);
}
char *
crunch(fp)
FILE *fp;
{
TSK_MD5_CTX md;
unsigned char sum[MD5_HASH_LENGTH];
unsigned char buf[BUFSIZ];
static char result[2 * MD5_HASH_LENGTH + 1];
static char hex[] = "0123456789abcdef";
int buflen;
int i;
TSK_MD5_Init(&md);
while ((buflen = fread(buf, 1, BUFSIZ, fp)) > 0)
TSK_MD5_Update(&md, buf, buflen);
TSK_MD5_Final(sum, &md);
for (i = 0; i < MD5_HASH_LENGTH; i++) {
result[2 * i] = hex[(sum[i] >> 4) & 0xf];
result[2 * i + 1] = hex[sum[i] & 0xf];
}
return (result);
}
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