177 lines
3 KiB
C
177 lines
3 KiB
C
/*
|
|
* Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <libgen.h>
|
|
#include <getopt.h> /* for getopt() */
|
|
#include <stdarg.h>
|
|
|
|
#include "buffalo-lib.h"
|
|
|
|
#define ERR(fmt, args...) do { \
|
|
fflush(0); \
|
|
fprintf(stderr, "[%s] *** error: " fmt "\n", \
|
|
progname, ## args ); \
|
|
} while (0)
|
|
|
|
static char *progname;
|
|
static char *ifname;
|
|
static char *ofname;
|
|
static int do_decrypt;
|
|
|
|
void usage(int status)
|
|
{
|
|
FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
|
|
|
|
fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
|
|
fprintf(stream,
|
|
"\n"
|
|
"Options:\n"
|
|
" -d decrypt instead of encrypt\n"
|
|
" -i <file> read input from the file <file>\n"
|
|
" -o <file> write output to the file <file>\n"
|
|
" -h show this screen\n"
|
|
);
|
|
|
|
exit(status);
|
|
}
|
|
|
|
static const unsigned char *crypt_key1 = (unsigned char *)
|
|
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
|
|
static const unsigned char *crypt_key2 = (unsigned char *)
|
|
"XYZ0123hijklmnopqABCDEFGHrstuvabcdefgwxyzIJKLMSTUVW456789NOPQR";
|
|
|
|
static void crypt_header(unsigned char *buf, ssize_t len,
|
|
const unsigned char *key1, const unsigned char *key2)
|
|
{
|
|
ssize_t i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
unsigned int j;
|
|
|
|
for (j = 0; key1[j]; j++)
|
|
if (buf[i] == key1[j]) {
|
|
buf[i] = key2[j];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int crypt_file(void)
|
|
{
|
|
unsigned char *buf = NULL;
|
|
ssize_t src_len;
|
|
int err;
|
|
int ret = -1;
|
|
|
|
src_len = get_file_size(ifname);
|
|
if (src_len < 0) {
|
|
ERR("unable to get size of '%s'", ifname);
|
|
goto out;
|
|
}
|
|
|
|
buf = malloc(src_len);
|
|
if (buf == NULL) {
|
|
ERR("no memory for the buffer");
|
|
goto out;
|
|
}
|
|
|
|
err = read_file_to_buf(ifname, buf, src_len);
|
|
if (err) {
|
|
ERR("unable to read from file '%s'", ifname);
|
|
goto out;
|
|
}
|
|
|
|
if (do_decrypt)
|
|
crypt_header(buf, 512, crypt_key2, crypt_key1);
|
|
else
|
|
crypt_header(buf, 512, crypt_key1, crypt_key2);
|
|
|
|
err = write_buf_to_file(ofname, buf, src_len);
|
|
if (err) {
|
|
ERR("unable to write to file '%s'", ofname);
|
|
goto out;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
free(buf);
|
|
return ret;
|
|
}
|
|
|
|
static int check_params(void)
|
|
{
|
|
int ret = -1;
|
|
|
|
if (ifname == NULL) {
|
|
ERR("no input file specified");
|
|
goto out;
|
|
}
|
|
|
|
if (ofname == NULL) {
|
|
ERR("no output file specified");
|
|
goto out;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int res = EXIT_FAILURE;
|
|
int err;
|
|
|
|
progname = basename(argv[0]);
|
|
|
|
while ( 1 ) {
|
|
int c;
|
|
|
|
c = getopt(argc, argv, "di:o:h");
|
|
if (c == -1)
|
|
break;
|
|
|
|
switch (c) {
|
|
case 'd':
|
|
do_decrypt = 1;
|
|
break;
|
|
case 'i':
|
|
ifname = optarg;
|
|
break;
|
|
case 'o':
|
|
ofname = optarg;
|
|
break;
|
|
case 'h':
|
|
usage(EXIT_SUCCESS);
|
|
break;
|
|
default:
|
|
usage(EXIT_FAILURE);
|
|
break;
|
|
}
|
|
}
|
|
|
|
err = check_params();
|
|
if (err)
|
|
goto out;
|
|
|
|
err = crypt_file();
|
|
if (err)
|
|
goto out;
|
|
|
|
res = EXIT_SUCCESS;
|
|
|
|
out:
|
|
return res;
|
|
}
|