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-rw-r--r--tools/firmware-utils/src/buffalo-enc.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/tools/firmware-utils/src/buffalo-enc.c b/tools/firmware-utils/src/buffalo-enc.c
new file mode 100644
index 0000000..794659e
--- /dev/null
+++ b/tools/firmware-utils/src/buffalo-enc.c
@@ -0,0 +1,304 @@
+/*
+ * 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 char *crypt_key = "Buffalo";
+static char *magic = "start";
+static int longstate;
+static unsigned char seed = 'O';
+
+static char *product;
+static char *version;
+static int do_decrypt;
+static int offset;
+
+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"
+" -l use longstate {en,de}cryption method\n"
+" -k <key> use <key> for encryption (default: Buffalo)\n"
+" -m <magic> set magic to <magic>\n"
+" -p <product> set product name to <product>\n"
+" -v <version> set version to <version>\n"
+" -h show this screen\n"
+" -O Offset of encrypted data in file (decryption)\n"
+ );
+
+ exit(status);
+}
+
+static int decrypt_file(void)
+{
+ struct enc_param ep;
+ ssize_t src_len;
+ unsigned char *buf = NULL;
+ 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;
+ }
+
+ memset(&ep, '\0', sizeof(ep));
+ ep.key = (unsigned char *) crypt_key;
+ ep.longstate = longstate;
+
+ err = decrypt_buf(&ep, buf + offset, src_len - offset);
+ if (err) {
+ ERR("unable to decrypt '%s'", ifname);
+ goto out;
+ }
+
+ printf("Magic\t\t: '%s'\n", ep.magic);
+ printf("Seed\t\t: 0x%02x\n", ep.seed);
+ printf("Product\t\t: '%s'\n", ep.product);
+ printf("Version\t\t: '%s'\n", ep.version);
+ printf("Data len\t: %u\n", ep.datalen);
+ printf("Checksum\t: 0x%08x\n", ep.csum);
+
+ err = write_buf_to_file(ofname, buf + offset, ep.datalen);
+ if (err) {
+ ERR("unable to write to file '%s'", ofname);
+ goto out;
+ }
+
+ ret = 0;
+
+out:
+ free(buf);
+ return ret;
+}
+
+static int encrypt_file(void)
+{
+ struct enc_param ep;
+ ssize_t src_len;
+ unsigned char *buf;
+ uint32_t hdrlen;
+ ssize_t totlen = 0;
+ 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;
+ }
+
+ totlen = enc_compute_buf_len(product, version, src_len);
+ hdrlen = enc_compute_header_len(product, version);
+
+ buf = malloc(totlen);
+ if (buf == NULL) {
+ ERR("no memory for the buffer");
+ goto out;
+ }
+
+ err = read_file_to_buf(ifname, &buf[hdrlen], src_len);
+ if (err) {
+ ERR("unable to read from file '%s'", ofname);
+ goto free_buf;
+ }
+
+ memset(&ep, '\0', sizeof(ep));
+ ep.key = (unsigned char *) crypt_key;
+ ep.seed = seed;
+ ep.longstate = longstate;
+ ep.csum = buffalo_csum(src_len, &buf[hdrlen], src_len);
+ ep.datalen = src_len;
+ strcpy((char *) ep.magic, magic);
+ strcpy((char *) ep.product, product);
+ strcpy((char *) ep.version, version);
+
+ err = encrypt_buf(&ep, buf, &buf[hdrlen]);
+ if (err) {
+ ERR("invalid input file");
+ goto free_buf;
+ }
+
+ err = write_buf_to_file(ofname, buf, totlen);
+ if (err) {
+ ERR("unable to write to file '%s'", ofname);
+ goto free_buf;
+ }
+
+ ret = 0;
+
+free_buf:
+ free(buf);
+out:
+ 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;
+ }
+
+ if (crypt_key == NULL) {
+ ERR("no key specified");
+ goto out;
+ } else if (strlen(crypt_key) > BCRYPT_MAX_KEYLEN) {
+ ERR("key '%s' is too long", crypt_key);
+ goto out;
+ }
+
+ if (strlen(magic) != (ENC_MAGIC_LEN - 1)) {
+ ERR("length of magic must be %d", ENC_MAGIC_LEN - 1);
+ goto out;
+ }
+
+ if (!do_decrypt) {
+ if (product == NULL) {
+ ERR("no product specified");
+ goto out;
+ }
+
+ if (version == NULL) {
+ ERR("no version specified");
+ goto out;
+ }
+
+ if (strlen(product) > (ENC_PRODUCT_LEN - 1)) {
+ ERR("product name '%s' is too long", product);
+ goto out;
+ }
+
+ if (strlen(version) > (ENC_VERSION_LEN - 1)) {
+ ERR("version '%s' is too long", version);
+ 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, "adi:m:o:hlp:v:k:O:r:s:");
+ if (c == -1)
+ break;
+
+ switch (c) {
+ case 'd':
+ do_decrypt = 1;
+ break;
+ case 'i':
+ ifname = optarg;
+ break;
+ case 'l':
+ longstate = 1;
+ break;
+ case 'm':
+ magic = optarg;
+ break;
+ case 'o':
+ ofname = optarg;
+ break;
+ case 'p':
+ product = optarg;
+ break;
+ case 'v':
+ version = optarg;
+ break;
+ case 'k':
+ crypt_key = optarg;
+ break;
+ case 's':
+ seed = strtoul(optarg, NULL, 16);
+ break;
+ case 'O':
+ offset = strtoul(optarg, NULL, 0);
+ break;
+ case 'h':
+ usage(EXIT_SUCCESS);
+ break;
+ default:
+ usage(EXIT_FAILURE);
+ break;
+ }
+ }
+
+ err = check_params();
+ if (err)
+ goto out;
+
+ if (do_decrypt)
+ err = decrypt_file();
+ else
+ err = encrypt_file();
+
+ if (err)
+ goto out;
+
+ res = EXIT_SUCCESS;
+
+out:
+ return res;
+}