mirror of https://github.com/hak5/openwrt-owl.git
firmware-utils: add a file {en,de}cryption tool, based on the PC1 encryption algrithm
SVN-Revision: 16550owl
Gabor Juhos
parent
f1a87ef24a
commit
c1a4eef483
|
|
@ -49,6 +49,7 @@ define Host/Compile
|
|||
$(call cc,nand_ecc)
|
||||
$(call cc2,mkplanexfw sha1)
|
||||
$(call cc2,mktplinkfw md5)
|
||||
$(call cc,pc1crypt)
|
||||
endef
|
||||
|
||||
define Host/Install
|
||||
|
|
|
|||
|
|
@ -0,0 +1,361 @@
|
|||
/*
|
||||
* Copyright (C) 2009 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.
|
||||
*
|
||||
* This code was based on:
|
||||
* PC1 Cipher Algorithm ( Pukall Cipher 1 )
|
||||
* By Alexander PUKALL 1991
|
||||
* free code no restriction to use
|
||||
* please include the name of the Author in the final software
|
||||
* the Key is 128 bits
|
||||
* http://membres.lycos.fr/pc1/
|
||||
*
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdint.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h> /* for unlink() */
|
||||
#include <libgen.h>
|
||||
#include <getopt.h> /* for getopt() */
|
||||
#include <stdarg.h>
|
||||
#include <errno.h>
|
||||
#include <sys/stat.h>
|
||||
|
||||
struct pc1_ctx {
|
||||
unsigned short ax;
|
||||
unsigned short bx;
|
||||
unsigned short cx;
|
||||
unsigned short dx;
|
||||
unsigned short si;
|
||||
unsigned short tmp;
|
||||
unsigned short x1a2;
|
||||
unsigned short x1a0[8];
|
||||
unsigned short res;
|
||||
unsigned short i;
|
||||
unsigned short inter;
|
||||
unsigned short cfc;
|
||||
unsigned short cfd;
|
||||
unsigned short compte;
|
||||
unsigned char cle[17];
|
||||
short c;
|
||||
};
|
||||
|
||||
static void pc1_finish(struct pc1_ctx *pc1)
|
||||
{
|
||||
/* erase all variables */
|
||||
memset(pc1, 0, sizeof(struct pc1_ctx));
|
||||
}
|
||||
|
||||
static void pc1_code(struct pc1_ctx *pc1)
|
||||
{
|
||||
pc1->dx = pc1->x1a2 + pc1->i;
|
||||
pc1->ax = pc1->x1a0[pc1->i];
|
||||
pc1->cx = 0x015a;
|
||||
pc1->bx = 0x4e35;
|
||||
|
||||
pc1->tmp = pc1->ax;
|
||||
pc1->ax = pc1->si;
|
||||
pc1->si = pc1->tmp;
|
||||
|
||||
pc1->tmp = pc1->ax;
|
||||
pc1->ax = pc1->dx;
|
||||
pc1->dx = pc1->tmp;
|
||||
|
||||
if (pc1->ax != 0) {
|
||||
pc1->ax = pc1->ax * pc1->bx;
|
||||
}
|
||||
|
||||
pc1->tmp = pc1->ax;
|
||||
pc1->ax = pc1->cx;
|
||||
pc1->cx = pc1->tmp;
|
||||
|
||||
if (pc1->ax != 0) {
|
||||
pc1->ax = pc1->ax * pc1->si;
|
||||
pc1->cx = pc1->ax + pc1->cx;
|
||||
}
|
||||
|
||||
pc1->tmp = pc1->ax;
|
||||
pc1->ax = pc1->si;
|
||||
pc1->si = pc1->tmp;
|
||||
pc1->ax = pc1->ax * pc1->bx;
|
||||
pc1->dx = pc1->cx + pc1->dx;
|
||||
|
||||
pc1->ax = pc1->ax + 1;
|
||||
|
||||
pc1->x1a2 = pc1->dx;
|
||||
pc1->x1a0[pc1->i] = pc1->ax;
|
||||
|
||||
pc1->res = pc1->ax ^ pc1->dx;
|
||||
pc1->i = pc1->i + 1;
|
||||
}
|
||||
|
||||
static void pc1_assemble(struct pc1_ctx *pc1)
|
||||
{
|
||||
pc1->x1a0[0] = (pc1->cle[0] * 256) + pc1->cle[1];
|
||||
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->res;
|
||||
|
||||
pc1->x1a0[1] = pc1->x1a0[0] ^ ((pc1->cle[2]*256) + pc1->cle[3]);
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->inter ^ pc1->res;
|
||||
|
||||
pc1->x1a0[2] = pc1->x1a0[1] ^ ((pc1->cle[4]*256) + pc1->cle[5]);
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->inter ^ pc1->res;
|
||||
|
||||
pc1->x1a0[3] = pc1->x1a0[2] ^ ((pc1->cle[6]*256) + pc1->cle[7]);
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->inter ^ pc1->res;
|
||||
|
||||
pc1->x1a0[4] = pc1->x1a0[3] ^ ((pc1->cle[8]*256) + pc1->cle[9]);
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->inter ^ pc1->res;
|
||||
|
||||
pc1->x1a0[5] = pc1->x1a0[4] ^ ((pc1->cle[10]*256) + pc1->cle[11]);
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->inter ^ pc1->res;
|
||||
|
||||
pc1->x1a0[6] = pc1->x1a0[5] ^ ((pc1->cle[12]*256) + pc1->cle[13]);
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->inter ^ pc1->res;
|
||||
|
||||
pc1->x1a0[7] = pc1->x1a0[6] ^ ((pc1->cle[14]*256) + pc1->cle[15]);
|
||||
pc1_code(pc1);
|
||||
pc1->inter = pc1->inter ^ pc1->res;
|
||||
|
||||
pc1->i = 0;
|
||||
}
|
||||
|
||||
static unsigned char pc1_decrypt(struct pc1_ctx *pc1, short c)
|
||||
{
|
||||
pc1_assemble(pc1);
|
||||
pc1->cfc = pc1->inter >> 8;
|
||||
pc1->cfd = pc1->inter & 255; /* cfc^cfd = random byte */
|
||||
|
||||
c = c ^ (pc1->cfc ^ pc1->cfd);
|
||||
for (pc1->compte = 0; pc1->compte <= 15; pc1->compte++) {
|
||||
/* we mix the plaintext byte with the key */
|
||||
pc1->cle[pc1->compte] = pc1->cle[pc1->compte] ^ c;
|
||||
}
|
||||
|
||||
return c;
|
||||
}
|
||||
|
||||
static unsigned char pc1_encrypt(struct pc1_ctx *pc1, short c)
|
||||
{
|
||||
pc1_assemble(pc1);
|
||||
pc1->cfc = pc1->inter >> 8;
|
||||
pc1->cfd = pc1->inter & 255; /* cfc^cfd = random byte */
|
||||
|
||||
for (pc1->compte = 0; pc1->compte <= 15; pc1->compte++) {
|
||||
/* we mix the plaintext byte with the key */
|
||||
pc1->cle[pc1->compte] = pc1->cle[pc1->compte] ^ c;
|
||||
}
|
||||
c = c ^ (pc1->cfc ^ pc1->cfd);
|
||||
|
||||
return c;
|
||||
}
|
||||
|
||||
static void pc1_init(struct pc1_ctx *pc1)
|
||||
{
|
||||
memset(pc1, 0, sizeof(struct pc1_ctx));
|
||||
|
||||
/* ('Remsaalps!123456') is the key used, you can change it */
|
||||
strcpy(pc1->cle, "Remsaalps!123456");
|
||||
}
|
||||
|
||||
static void pc1_decrypt_buf(struct pc1_ctx *pc1, unsigned char *buf,
|
||||
unsigned len)
|
||||
{
|
||||
unsigned i;
|
||||
|
||||
for (i = 0; i < len; i++)
|
||||
buf[i] = pc1_decrypt(pc1, buf[i]);
|
||||
}
|
||||
|
||||
static void pc1_encrypt_buf(struct pc1_ctx *pc1, unsigned char *buf,
|
||||
unsigned len)
|
||||
{
|
||||
unsigned i;
|
||||
|
||||
for (i = 0; i < len; i++)
|
||||
buf[i] = pc1_encrypt(pc1, buf[i]);
|
||||
}
|
||||
|
||||
/*
|
||||
* Globals
|
||||
*/
|
||||
static char *ifname;
|
||||
static char *progname;
|
||||
static char *ofname;
|
||||
static int decrypt;
|
||||
|
||||
/*
|
||||
* Message macros
|
||||
*/
|
||||
#define ERR(fmt, ...) do { \
|
||||
fflush(0); \
|
||||
fprintf(stderr, "[%s] *** error: " fmt "\n", \
|
||||
progname, ## __VA_ARGS__ ); \
|
||||
} while (0)
|
||||
|
||||
#define ERRS(fmt, ...) do { \
|
||||
int save = errno; \
|
||||
fflush(0); \
|
||||
fprintf(stderr, "[%s] *** error: " fmt "\n", \
|
||||
progname, ## __VA_ARGS__, strerror(save)); \
|
||||
} while (0)
|
||||
|
||||
void usage(int status)
|
||||
{
|
||||
FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
|
||||
struct board_info *board;
|
||||
|
||||
fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
|
||||
fprintf(stream,
|
||||
"\n"
|
||||
"Options:\n"
|
||||
" -d decrypt instead of encrypt"
|
||||
" -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);
|
||||
}
|
||||
|
||||
#define BUFSIZE (64 * 1024)
|
||||
|
||||
int main(int argc, char *argv[])
|
||||
{
|
||||
struct pc1_ctx pc1;
|
||||
int res = EXIT_FAILURE;
|
||||
int err;
|
||||
struct stat st;
|
||||
char *buf;
|
||||
unsigned total;
|
||||
|
||||
FILE *outfile, *infile;
|
||||
|
||||
progname = basename(argv[0]);
|
||||
|
||||
while ( 1 ) {
|
||||
int c;
|
||||
|
||||
c = getopt(argc, argv, "di:o:h");
|
||||
if (c == -1)
|
||||
break;
|
||||
|
||||
switch (c) {
|
||||
case 'd':
|
||||
decrypt = 1;
|
||||
break;
|
||||
case 'i':
|
||||
ifname = optarg;
|
||||
break;
|
||||
case 'o':
|
||||
ofname = optarg;
|
||||
break;
|
||||
case 'h':
|
||||
usage(EXIT_SUCCESS);
|
||||
break;
|
||||
default:
|
||||
usage(EXIT_FAILURE);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (ifname == NULL) {
|
||||
ERR("no input file specified");
|
||||
goto err;
|
||||
}
|
||||
|
||||
if (ofname == NULL) {
|
||||
ERR("no output file specified");
|
||||
goto err;
|
||||
}
|
||||
|
||||
err = stat(ifname, &st);
|
||||
if (err){
|
||||
ERRS("stat failed on %s", ifname);
|
||||
goto err;
|
||||
}
|
||||
|
||||
total = st.st_size;
|
||||
buf = malloc(BUFSIZE);
|
||||
if (!buf) {
|
||||
ERR("no memory for buffer\n");
|
||||
goto err;
|
||||
}
|
||||
|
||||
infile = fopen(ifname, "r");
|
||||
if (infile == NULL) {
|
||||
ERRS("could not open \"%s\" for reading", ifname);
|
||||
goto err_free;
|
||||
}
|
||||
|
||||
outfile = fopen(ofname, "w");
|
||||
if (outfile == NULL) {
|
||||
ERRS("could not open \"%s\" for writing", ofname);
|
||||
goto err_close_in;
|
||||
}
|
||||
|
||||
pc1_init(&pc1);
|
||||
while (total > 0) {
|
||||
unsigned datalen;
|
||||
|
||||
if (total > BUFSIZE)
|
||||
datalen = BUFSIZE;
|
||||
else
|
||||
datalen = total;
|
||||
|
||||
errno = 0;
|
||||
fread(buf, datalen, 1, infile);
|
||||
if (errno != 0) {
|
||||
ERRS("unable to read from file %s", ifname);
|
||||
goto err_close_out;
|
||||
}
|
||||
|
||||
if (decrypt)
|
||||
pc1_decrypt_buf(&pc1, buf, datalen);
|
||||
else
|
||||
pc1_encrypt_buf(&pc1, buf, datalen);
|
||||
|
||||
errno = 0;
|
||||
fwrite(buf, datalen, 1, outfile);
|
||||
if (errno) {
|
||||
ERRS("unable to write to file %s", ofname);
|
||||
goto err_close_out;
|
||||
}
|
||||
|
||||
total -= datalen;
|
||||
}
|
||||
pc1_finish(&pc1);
|
||||
|
||||
res = EXIT_SUCCESS;
|
||||
|
||||
out_flush:
|
||||
fflush(outfile);
|
||||
|
||||
err_close_out:
|
||||
fclose(outfile);
|
||||
if (res != EXIT_SUCCESS) {
|
||||
unlink(ofname);
|
||||
}
|
||||
|
||||
err_close_in:
|
||||
fclose(infile);
|
||||
|
||||
err_free:
|
||||
free(buf);
|
||||
|
||||
err:
|
||||
return res;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue