0d7a558f23
Also print an error message if decryption fails. SVN-Revision: 27167
299 lines
5.5 KiB
C
299 lines
5.5 KiB
C
/*
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* Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <libgen.h>
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#include <getopt.h> /* for getopt() */
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#include <stdarg.h>
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#include "buffalo-lib.h"
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#define ERR(fmt, args...) do { \
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt "\n", \
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progname, ## args ); \
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} while (0)
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static char *progname;
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static char *ifname;
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static char *ofname;
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static char *crypt_key = "Buffalo";
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static char *magic = "start";
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static int longstate;
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static unsigned char seed = 'O';
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static char *product;
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static char *version;
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static int do_decrypt;
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void usage(int status)
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{
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FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
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fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
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fprintf(stream,
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"\n"
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"Options:\n"
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" -d decrypt instead of encrypt\n"
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" -i <file> read input from the file <file>\n"
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" -o <file> write output to the file <file>\n"
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" -l use longstate {en,de}cryption method\n"
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" -k <key> use <key> for encryption (default: Buffalo)\n"
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" -m <magic> set magic to <magic>\n"
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" -p <product> set product name to <product>\n"
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" -v <version> set version to <version>\n"
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" -h show this screen\n"
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);
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exit(status);
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}
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static int decrypt_file(void)
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{
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struct enc_param ep;
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ssize_t src_len;
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unsigned char *buf = NULL;
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int err;
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int ret = -1;
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src_len = get_file_size(ifname);
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if (src_len < 0) {
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ERR("unable to get size of '%s'", ifname);
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goto out;
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}
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buf = malloc(src_len);
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if (buf == NULL) {
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ERR("no memory for the buffer");
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goto out;
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}
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err = read_file_to_buf(ifname, buf, src_len);
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if (err) {
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ERR("unable to read from file '%s'", ifname);
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goto out;
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}
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memset(&ep, '\0', sizeof(ep));
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ep.key = (unsigned char *) crypt_key;
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err = decrypt_buf(&ep, buf, src_len);
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if (err) {
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ERR("unable to decrypt '%s'", ifname);
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goto out;
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}
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printf("Magic\t\t: '%s'\n", ep.magic);
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printf("Seed\t\t: 0x%02x\n", ep.seed);
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printf("Product\t\t: '%s'\n", ep.product);
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printf("Version\t\t: '%s'\n", ep.version);
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printf("Data len\t: %u\n", ep.datalen);
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printf("Checksum\t: 0x%08x\n", ep.csum);
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err = write_buf_to_file(ofname, buf, ep.datalen);
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if (err) {
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ERR("unable to write to file '%s'", ofname);
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goto out;
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}
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ret = 0;
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out:
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free(buf);
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return ret;
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}
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static int encrypt_file(void)
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{
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struct enc_param ep;
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ssize_t src_len;
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unsigned char *buf;
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uint32_t hdrlen;
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ssize_t totlen = 0;
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int err;
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int ret = -1;
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src_len = get_file_size(ifname);
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if (src_len < 0) {
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ERR("unable to get size of '%s'", ifname);
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goto out;
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}
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totlen = enc_compute_buf_len(product, version, src_len);
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hdrlen = enc_compute_header_len(product, version);
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buf = malloc(totlen);
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if (buf == NULL) {
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ERR("no memory for the buffer");
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goto out;
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}
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err = read_file_to_buf(ifname, &buf[hdrlen], src_len);
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if (err) {
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ERR("unable to read from file '%s'", ofname);
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goto free_buf;
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}
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memset(&ep, '\0', sizeof(ep));
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ep.key = (unsigned char *) crypt_key;
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ep.seed = seed;
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ep.longstate = longstate;
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ep.csum = buffalo_csum(src_len, &buf[hdrlen], src_len);
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ep.datalen = src_len;
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strcpy((char *) ep.magic, magic);
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strcpy((char *) ep.product, product);
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strcpy((char *) ep.version, version);
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err = encrypt_buf(&ep, buf, &buf[hdrlen]);
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if (err) {
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ERR("invalid input file");
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goto free_buf;
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}
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err = write_buf_to_file(ofname, buf, totlen);
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if (err) {
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ERR("unable to write to file '%s'", ofname);
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goto free_buf;
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}
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ret = 0;
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free_buf:
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free(buf);
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out:
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return ret;
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}
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static int check_params(void)
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{
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int ret = -1;
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if (ifname == NULL) {
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ERR("no input file specified");
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goto out;
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}
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if (ofname == NULL) {
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ERR("no output file specified");
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goto out;
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}
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if (crypt_key == NULL) {
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ERR("no key specified");
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goto out;
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} else if (strlen(crypt_key) > BCRYPT_MAX_KEYLEN) {
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ERR("key '%s' is too long", crypt_key);
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goto out;
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}
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if (strlen(magic) != (ENC_MAGIC_LEN - 1)) {
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ERR("length of magic must be %d", ENC_MAGIC_LEN - 1);
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goto out;
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}
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if (!do_decrypt) {
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if (product == NULL) {
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ERR("no product specified");
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goto out;
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}
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if (version == NULL) {
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ERR("no version specified");
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goto out;
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}
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if (strlen(product) > (ENC_PRODUCT_LEN - 1)) {
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ERR("product name '%s' is too long", product);
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goto out;
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}
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if (strlen(version) > (ENC_VERSION_LEN - 1)) {
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ERR("version '%s' is too long", version);
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goto out;
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}
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}
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ret = 0;
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out:
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return ret;
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}
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int main(int argc, char *argv[])
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{
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int res = EXIT_FAILURE;
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int err;
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progname = basename(argv[0]);
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while ( 1 ) {
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int c;
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c = getopt(argc, argv, "adi:m:o:hp:v:k:r:s:");
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if (c == -1)
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break;
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switch (c) {
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case 'd':
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do_decrypt = 1;
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break;
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case 'i':
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ifname = optarg;
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break;
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case 'l':
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longstate = 1;
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break;
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case 'm':
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magic = optarg;
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break;
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case 'o':
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ofname = optarg;
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break;
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case 'p':
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product = optarg;
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break;
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case 'v':
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version = optarg;
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break;
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case 'k':
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crypt_key = optarg;
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break;
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case 's':
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seed = strtoul(optarg, NULL, 16);
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break;
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case 'h':
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usage(EXIT_SUCCESS);
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break;
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default:
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usage(EXIT_FAILURE);
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break;
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}
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}
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err = check_params();
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if (err)
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goto out;
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if (do_decrypt)
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err = decrypt_file();
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else
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err = encrypt_file();
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if (err)
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goto out;
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res = EXIT_SUCCESS;
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out:
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return res;
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}
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