diff options
Diffstat (limited to 'tools/firmware-utils/src/buffalo-enc.c')
| -rw-r--r-- | tools/firmware-utils/src/buffalo-enc.c | 304 |
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; +} |