321 lines
8 KiB
C
321 lines
8 KiB
C
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/*
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* Copyright (C) 2013 Jeff Kent <jeff@jkent.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This tool encrypts and decrypts uImage formatted firmware for Hilink
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* HLK-RM04 wireless modules. It will also truncate a dump of mtd6 and make
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* it an image suitable for flashing via the stock firmware upgrade page.
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*
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* Build instructions:
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* gcc -lcrypto hlkcrypt.c -o hlkcrypt
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <openssl/des.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#define DES_KEY "H@L9K*(3"
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#ifndef min
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#define min(a,b) \
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({ __typeof__ (a) _a = (a); \
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__typeof__ (b) _b = (b); \
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_a < _b ? _a : _b; })
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#endif
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#define IH_MAGIC 0x27051956
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#define IH_NMLEN 32
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typedef struct image_header {
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uint32_t ih_magic; /* Image Header Magic Number */
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uint32_t ih_hcrc; /* Image Header CRC Checksum */
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uint32_t ih_time; /* Image Creation Timestamp */
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uint32_t ih_size; /* Image Data Size */
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uint32_t ih_load; /* Data Load Address */
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uint32_t ih_ep; /* Entry Point Address */
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uint32_t ih_dcrc; /* Image Data CRC Checksum */
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uint8_t ih_os; /* Operating System */
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uint8_t ih_arch; /* CPU architecture */
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uint8_t ih_type; /* Image Type */
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uint8_t ih_comp; /* Compression Type */
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uint8_t ih_name[IH_NMLEN]; /* Image Name */
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} image_header_t;
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static int temp_fd = -1;
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static DES_key_schedule schedule;
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static void show_usage(const char *arg0);
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static void exit_cleanup(void);
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static void copy_file(int src, int dst);
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static void encrypt(void *p, off_t len);
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static void decrypt(void *p, off_t len);
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int main(int argc, char **argv)
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{
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int encrypt_opt = 0;
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int decrypt_opt = 0;
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int input_opt = 0;
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int output_opt = 0;
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char *input_filename = NULL;
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char *output_filename = NULL;
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int input_fd;
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int output_fd;
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off_t file_len;
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char *p;
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char buf[sizeof(image_header_t) + 3];
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image_header_t *header;
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while (1) {
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static struct option long_options[] = {
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{"encrypt", no_argument, 0, 'e'},
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{"decrypt", no_argument, 0, 'd'},
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{"input", required_argument, 0, 'i'},
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{"output", required_argument, 0, 'o'},
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{0, 0, 0, 0 }
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};
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int option_index = 0;
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int c = getopt_long(argc, argv, "dei:o:",
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long_options, &option_index);
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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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decrypt_opt++;
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if (decrypt_opt > 1) {
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fprintf(stderr, "%s: decrypt may only be specified once\n",
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argv[0]);
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show_usage(argv[0]);
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}
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break;
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case 'e':
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encrypt_opt++;
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if (encrypt_opt > 1) {
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fprintf(stderr, "%s: encrypt may only be specified once\n",
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argv[0]);
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show_usage(argv[0]);
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}
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break;
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case 'i':
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input_opt++;
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if (input_opt > 1) {
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fprintf(stderr, "%s: only one input file may be specified\n",
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argv[0]);
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show_usage(argv[0]);
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}
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if (strcmp("-", optarg) != 0) {
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input_filename = optarg;
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}
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break;
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case 'o':
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output_opt++;
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if (output_opt > 1) {
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fprintf(stderr, "%s: only one output file may be specified\n",
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argv[0]);
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show_usage(argv[0]);
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}
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if (strcmp("-", optarg) != 0) {
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output_filename = optarg;
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}
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break;
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case '?':
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exit(-1);
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default:
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abort();
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}
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}
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if (decrypt_opt && encrypt_opt) {
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fprintf(stderr, "%s: decrypt and encrypt may not be used together\n",
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argv[0]);
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show_usage(argv[0]);
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}
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if (!decrypt_opt && !encrypt_opt) {
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fprintf(stderr, "%s: neither decrypt or encrypt were specified\n",
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argv[0]);
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show_usage(argv[0]);
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}
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temp_fd = fileno(tmpfile());
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if (temp_fd < 0) {
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fprintf(stderr, "Can't create temporary file\n");
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exit(EXIT_FAILURE);
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}
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atexit(exit_cleanup);
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DES_set_key_unchecked((const_DES_cblock *)DES_KEY, &schedule);
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if (input_filename) {
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input_fd = open(input_filename, O_RDONLY);
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if (input_fd < 0) {
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fprintf(stderr, "Can't open %s for reading: %s\n", input_filename,
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strerror(errno));
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exit(EXIT_FAILURE);
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}
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copy_file(input_fd, temp_fd);
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close(input_fd);
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}
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else {
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copy_file(STDIN_FILENO, temp_fd);
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}
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file_len = lseek(temp_fd, 0, SEEK_CUR);
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if (file_len < 64) {
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fprintf(stderr, "Not enough data\n");
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exit(EXIT_FAILURE);
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}
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p = mmap(0, file_len, PROT_READ|PROT_WRITE, MAP_SHARED, temp_fd, 0);
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if (p == MAP_FAILED) {
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fprintf(stderr, "mmap failed: %s\n", strerror(errno));
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exit(EXIT_FAILURE);
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}
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if (encrypt_opt) {
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header = (image_header_t *)p;
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off_t len = min(file_len,
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ntohl(header->ih_size) + sizeof(image_header_t));
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if (ntohl(header->ih_magic) != IH_MAGIC) {
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fprintf(stderr, "Header magic incorrect: "
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"expected 0x%08X, got 0x%08X\n",
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IH_MAGIC, ntohl(header->ih_magic));
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munmap(p, file_len);
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exit(EXIT_FAILURE);
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}
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encrypt(p, len);
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munmap(p, file_len);
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if (len != file_len) {
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if (ftruncate(temp_fd, len) < 0) {
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fprintf(stderr, "ftruncate failed: %s\n", strerror(errno));
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exit(EXIT_FAILURE);
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}
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}
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}
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if (decrypt_opt) {
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off_t header_len = min(file_len, sizeof(image_header_t) + 3);
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memcpy(buf, p, header_len);
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decrypt(buf, header_len);
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header = (image_header_t *)buf;
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if (ntohl(header->ih_magic) != IH_MAGIC) {
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fprintf(stderr, "Header magic incorrect: "
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"expected 0x%08X, got 0x%08X\n",
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IH_MAGIC, ntohl(header->ih_magic));
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exit(EXIT_FAILURE);
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}
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decrypt(p, file_len);
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munmap(p, file_len);
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}
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lseek(temp_fd, 0, SEEK_SET);
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if (output_filename) {
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output_fd = creat(output_filename, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
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if (output_fd < 0) {
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fprintf(stderr, "Can't open %s for writing: %s\n",
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output_filename, strerror(errno));
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exit(EXIT_FAILURE);
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}
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copy_file(temp_fd, output_fd);
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close(output_fd);
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}
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else {
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copy_file(temp_fd, STDOUT_FILENO);
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}
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exit(EXIT_SUCCESS);
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return 0;
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}
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static void show_usage(const char *arg0)
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{
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fprintf(stderr, "usage: %s -d|-e [-i FILE] [-o FILE]\n\n", arg0);
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fprintf(stderr, "%-15s %s\n", "-d, --decrypt", "decrypt data");
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fprintf(stderr, "%-15s %s\n", "-e, --encrypt", "encrypt data");
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fprintf(stderr, "%-15s %s\n", "-i, --input", "intput file (defaults to stdin)");
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fprintf(stderr, "%-15s %s\n", "-o, --output", "output file (defaults to stdout)");
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exit(-1);
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}
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static void exit_cleanup(void)
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{
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if (temp_fd >= 0) {
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close(temp_fd);
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}
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}
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static void copy_file(int src, int dst)
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{
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char buf[4096];
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ssize_t size;
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while ((size = read(src, buf, 4096)) > 0) {
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write(dst, buf, size);
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}
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}
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static void encrypt(void *p, off_t len)
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{
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DES_cblock *pblock;
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int num_blocks;
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num_blocks = len / 8;
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pblock = (DES_cblock *) p;
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while (num_blocks--) {
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DES_ecb_encrypt(pblock, pblock, &schedule, DES_ENCRYPT);
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pblock++;
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}
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num_blocks = (len - 3) / 8;
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pblock = (DES_cblock *) (p + 3);
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while (num_blocks--) {
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DES_ecb_encrypt(pblock, pblock, &schedule, DES_ENCRYPT);
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pblock++;
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}
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}
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static void decrypt(void *p, off_t len)
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{
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DES_cblock *pblock;
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int num_blocks;
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num_blocks = (len - 3) / 8;
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pblock = (DES_cblock *) (p + 3);
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while (num_blocks--) {
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DES_ecb_encrypt(pblock, pblock, &schedule, DES_DECRYPT);
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pblock++;
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}
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num_blocks = len / 8;
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pblock = (DES_cblock *) p;
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while (num_blocks--) {
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DES_ecb_encrypt(pblock, pblock, &schedule, DES_DECRYPT);
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pblock++;
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}
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}
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