2 * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published
6 * by the Free Software Foundation.
15 #include <getopt.h> /* for getopt() */
18 #include "buffalo-lib.h"
20 #define ERR(fmt, args...) do { \
22 fprintf(stderr, "[%s] *** error: " fmt "\n", \
23 progname, ## args ); \
26 static char *progname;
29 static char *crypt_key = "Buffalo";
30 static char *magic = "start";
32 static unsigned char seed = 'O';
36 static int do_decrypt;
40 void usage(int status)
42 FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
44 fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
48 " -d decrypt instead of encrypt\n"
49 " -i <file> read input from the file <file>\n"
50 " -o <file> write output to the file <file>\n"
51 " -l use longstate {en,de}cryption method\n"
52 " -k <key> use <key> for encryption (default: Buffalo)\n"
53 " -m <magic> set magic to <magic>\n"
54 " -p <product> set product name to <product>\n"
55 " -v <version> set version to <version>\n"
56 " -h show this screen\n"
57 " -O Offset of encrypted data in file (decryption)\n"
58 " -S Size of unencrypted data in file (encryption)\n"
64 static int decrypt_file(void)
68 unsigned char *buf = NULL;
72 src_len = get_file_size(ifname);
74 ERR("unable to get size of '%s'", ifname);
78 buf = malloc(src_len);
80 ERR("no memory for the buffer");
84 err = read_file_to_buf(ifname, buf, src_len);
86 ERR("unable to read from file '%s'", ifname);
90 memset(&ep, '\0', sizeof(ep));
91 ep.key = (unsigned char *) crypt_key;
92 ep.longstate = longstate;
94 err = decrypt_buf(&ep, buf + offset, src_len - offset);
96 ERR("unable to decrypt '%s'", ifname);
100 printf("Magic\t\t: '%s'\n", ep.magic);
101 printf("Seed\t\t: 0x%02x\n", ep.seed);
102 printf("Product\t\t: '%s'\n", ep.product);
103 printf("Version\t\t: '%s'\n", ep.version);
104 printf("Data len\t: %u\n", ep.datalen);
105 printf("Checksum\t: 0x%08x\n", ep.csum);
107 err = write_buf_to_file(ofname, buf + offset, ep.datalen);
109 ERR("unable to write to file '%s'", ofname);
120 static int encrypt_file(void)
123 ssize_t src_len, tail_dst, tail_len, tail_src;
130 src_len = get_file_size(ifname);
132 ERR("unable to get size of '%s'", ifname);
137 tail_dst = enc_compute_buf_len(product, version, size);
138 tail_len = src_len - size;
139 totlen = tail_dst + tail_len;
141 totlen = enc_compute_buf_len(product, version, src_len);
143 buf = malloc(totlen);
145 ERR("no memory for the buffer");
149 hdrlen = enc_compute_header_len(product, version);
151 err = read_file_to_buf(ifname, &buf[hdrlen], src_len);
153 ERR("unable to read from file '%s'", ofname);
158 tail_src = hdrlen + size;
159 memmove(&buf[tail_dst], &buf[tail_src], tail_len);
160 memset(&buf[tail_src], 0, tail_dst - tail_src);
164 memset(&ep, '\0', sizeof(ep));
165 ep.key = (unsigned char *) crypt_key;
167 ep.longstate = longstate;
168 ep.csum = buffalo_csum(src_len, &buf[hdrlen], src_len);
169 ep.datalen = src_len;
170 strcpy((char *) ep.magic, magic);
171 strcpy((char *) ep.product, product);
172 strcpy((char *) ep.version, version);
174 err = encrypt_buf(&ep, buf, &buf[hdrlen]);
176 ERR("invalid input file");
180 err = write_buf_to_file(ofname, buf, totlen);
182 ERR("unable to write to file '%s'", ofname);
194 static int check_params(void)
198 if (ifname == NULL) {
199 ERR("no input file specified");
203 if (ofname == NULL) {
204 ERR("no output file specified");
208 if (crypt_key == NULL) {
209 ERR("no key specified");
211 } else if (strlen(crypt_key) > BCRYPT_MAX_KEYLEN) {
212 ERR("key '%s' is too long", crypt_key);
216 if (strlen(magic) != (ENC_MAGIC_LEN - 1)) {
217 ERR("length of magic must be %d", ENC_MAGIC_LEN - 1);
222 if (product == NULL) {
223 ERR("no product specified");
227 if (version == NULL) {
228 ERR("no version specified");
232 if (strlen(product) > (ENC_PRODUCT_LEN - 1)) {
233 ERR("product name '%s' is too long", product);
237 if (strlen(version) > (ENC_VERSION_LEN - 1)) {
238 ERR("version '%s' is too long", version);
249 int main(int argc, char *argv[])
251 int res = EXIT_FAILURE;
254 progname = basename(argv[0]);
259 c = getopt(argc, argv, "adi:m:o:hlp:v:k:O:r:s:S:");
289 seed = strtoul(optarg, NULL, 16);
292 offset = strtoul(optarg, NULL, 0);
295 size = strtoul(optarg, NULL, 0);
306 err = check_params();
311 err = decrypt_file();
313 err = encrypt_file();