firmware-utils: add HLK-RM04 tool

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 39238

1 files changed, 320 insertions, 0 deletions

diff --git a/tools/firmware-utils/src/mkhilinkfw.c b/tools/firmware-utils/src/mkhilinkfw.c
new file mode 100644
index 0000000..fe6a200
--- /dev/null
+++ b/tools/firmware-utils/src/mkhilinkfw.c
@@ -0,0 +1,320 @@
+/*
+ * Copyright (C) 2013 Jeff Kent <jeff@jkent.net>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This tool encrypts and decrypts uImage formatted firmware for Hilink
+ * HLK-RM04 wireless modules.  It will also truncate a dump of mtd6 and make
+ * it an image suitable for flashing via the stock firmware upgrade page.
+ *
+ * Build instructions: 
+ *   gcc -lcrypto hlkcrypt.c -o hlkcrypt
+ */
+ 
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <openssl/des.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+ 
+#define DES_KEY "H@L9K*(3"
+ 
+#ifndef min
+#define min(a,b) \
+   ({ __typeof__ (a) _a = (a); \
+       __typeof__ (b) _b = (b); \
+     _a < _b ? _a : _b; })
+#endif
+ 
+#define IH_MAGIC    0x27051956
+#define IH_NMLEN    32
+typedef struct image_header {
+    uint32_t    ih_magic;   /* Image Header Magic Number    */
+    uint32_t    ih_hcrc;    /* Image Header CRC Checksum    */
+    uint32_t    ih_time;    /* Image Creation Timestamp */
+    uint32_t    ih_size;    /* Image Data Size      */
+    uint32_t    ih_load;    /* Data  Load  Address      */
+    uint32_t    ih_ep;      /* Entry Point Address      */
+    uint32_t    ih_dcrc;    /* Image Data CRC Checksum  */
+    uint8_t     ih_os;      /* Operating System     */
+    uint8_t     ih_arch;    /* CPU architecture     */
+    uint8_t     ih_type;    /* Image Type           */
+    uint8_t     ih_comp;    /* Compression Type     */
+    uint8_t     ih_name[IH_NMLEN];  /* Image Name       */
+} image_header_t;
+ 
+static int temp_fd = -1;
+static DES_key_schedule schedule;
+ 
+static void show_usage(const char *arg0);
+static void exit_cleanup(void);
+static void copy_file(int src, int dst);
+static void encrypt(void *p, off_t len);
+static void decrypt(void *p, off_t len);
+ 
+ 
+int main(int argc, char **argv)
+{
+	int encrypt_opt = 0;
+	int decrypt_opt = 0;
+	int input_opt = 0;
+	int output_opt = 0;
+	char *input_filename = NULL;
+	char *output_filename = NULL;
+ 
+	int input_fd;
+	int output_fd;
+	off_t file_len;
+	char *p;
+	char buf[sizeof(image_header_t) + 3];
+	image_header_t *header;
+ 
+	while (1) {
+		static struct option long_options[] = {
+			{"encrypt", no_argument,       0, 'e'},
+			{"decrypt", no_argument,       0, 'd'},
+			{"input",   required_argument, 0, 'i'},
+			{"output",  required_argument, 0, 'o'},
+			{0,         0,                 0, 0  }
+		};
+		int option_index = 0;
+		int c = getopt_long(argc, argv, "dei:o:",
+		                long_options, &option_index);
+		if (c == -1)
+			break;
+ 
+		switch (c) {
+		case 'd':
+			decrypt_opt++;
+			if (decrypt_opt > 1) {
+				fprintf(stderr, "%s: decrypt may only be specified once\n",
+				        argv[0]);
+				show_usage(argv[0]);
+			}
+			break;
+ 
+		case 'e':
+			encrypt_opt++;
+			if (encrypt_opt > 1) {
+				fprintf(stderr, "%s: encrypt may only be specified once\n",
+				        argv[0]);
+				show_usage(argv[0]);
+			}
+			break;
+ 
+		case 'i':
+			input_opt++;
+			if (input_opt > 1) {
+				fprintf(stderr, "%s: only one input file may be specified\n",
+				        argv[0]);
+				show_usage(argv[0]);
+			}
+			if (strcmp("-", optarg) != 0) {
+				input_filename = optarg;
+			}
+			break;
+ 
+		case 'o':
+			output_opt++;
+			if (output_opt > 1) {
+				fprintf(stderr, "%s: only one output file may be specified\n",
+				        argv[0]);
+				show_usage(argv[0]);
+			}
+			if (strcmp("-", optarg) != 0) {
+				output_filename = optarg;
+			}
+			break;
+ 
+		case '?':
+			exit(-1);
+ 
+		default:
+			abort();
+		}
+	}
+ 
+	if (decrypt_opt && encrypt_opt) {
+		fprintf(stderr, "%s: decrypt and encrypt may not be used together\n",
+		        argv[0]);
+		show_usage(argv[0]);
+	}
+ 
+	if (!decrypt_opt && !encrypt_opt) {
+		fprintf(stderr, "%s: neither decrypt or encrypt were specified\n",
+		        argv[0]);
+		show_usage(argv[0]);
+	}
+ 
+	temp_fd = fileno(tmpfile());
+	if (temp_fd < 0) {
+		fprintf(stderr, "Can't create temporary file\n");
+		exit(EXIT_FAILURE);
+	}
+ 
+	atexit(exit_cleanup);
+	DES_set_key_unchecked((const_DES_cblock *)DES_KEY, &schedule);
+ 
+	if (input_filename) {
+		input_fd = open(input_filename, O_RDONLY);
+		if (input_fd < 0) {
+			fprintf(stderr, "Can't open %s for reading: %s\n", input_filename,
+			        strerror(errno));
+			exit(EXIT_FAILURE);
+		}
+		copy_file(input_fd, temp_fd);
+		close(input_fd);
+	}
+	else {
+		copy_file(STDIN_FILENO, temp_fd);
+	}
+ 
+	file_len = lseek(temp_fd, 0, SEEK_CUR);
+	if (file_len < 64) {
+		fprintf(stderr, "Not enough data\n");
+		exit(EXIT_FAILURE);
+	}
+ 
+	p = mmap(0, file_len, PROT_READ|PROT_WRITE, MAP_SHARED, temp_fd, 0);
+	if (p == MAP_FAILED) {
+		fprintf(stderr, "mmap failed: %s\n", strerror(errno));
+		exit(EXIT_FAILURE);
+	}	
+ 
+	if (encrypt_opt) {
+		header = (image_header_t *)p;
+		off_t len = min(file_len,
+		                ntohl(header->ih_size) + sizeof(image_header_t));
+		if (ntohl(header->ih_magic) != IH_MAGIC) {
+			fprintf(stderr, "Header magic incorrect: "
+			        "expected 0x%08X, got 0x%08X\n",
+			        IH_MAGIC, ntohl(header->ih_magic));
+			munmap(p, file_len);
+			exit(EXIT_FAILURE);
+		}
+		encrypt(p, len);
+		munmap(p, file_len);
+		if (len != file_len) {
+			if (ftruncate(temp_fd, len) < 0) {
+				fprintf(stderr, "ftruncate failed: %s\n", strerror(errno));
+				exit(EXIT_FAILURE);
+			}
+		}		
+	}
+ 
+	if (decrypt_opt) {
+		off_t header_len = min(file_len, sizeof(image_header_t) + 3);
+		memcpy(buf, p, header_len);
+		decrypt(buf, header_len);
+		header = (image_header_t *)buf;
+		if (ntohl(header->ih_magic) != IH_MAGIC) {
+			fprintf(stderr, "Header magic incorrect: "
+			        "expected 0x%08X, got 0x%08X\n",
+			        IH_MAGIC, ntohl(header->ih_magic));
+			exit(EXIT_FAILURE);
+		}
+		decrypt(p, file_len);
+		munmap(p, file_len);
+	}
+ 
+	lseek(temp_fd, 0, SEEK_SET);
+	if (output_filename) {
+		output_fd = creat(output_filename, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+		if (output_fd < 0) {
+			fprintf(stderr, "Can't open %s for writing: %s\n",
+			        output_filename, strerror(errno));
+			exit(EXIT_FAILURE);
+		}
+		copy_file(temp_fd, output_fd);
+		close(output_fd);
+	}
+	else {
+		copy_file(temp_fd, STDOUT_FILENO);
+	}
+ 
+	exit(EXIT_SUCCESS);
+	return 0;
+}
+ 
+static void show_usage(const char *arg0)
+{
+	fprintf(stderr, "usage: %s -d|-e [-i FILE] [-o FILE]\n\n", arg0);
+	fprintf(stderr, "%-15s %s\n", "-d, --decrypt", "decrypt data");
+	fprintf(stderr, "%-15s %s\n", "-e, --encrypt", "encrypt data");
+	fprintf(stderr, "%-15s %s\n", "-i, --input", "intput file (defaults to stdin)");
+	fprintf(stderr, "%-15s %s\n", "-o, --output", "output file (defaults to stdout)");
+	exit(-1);
+}
+ 
+static void exit_cleanup(void)
+{
+	if (temp_fd >= 0) {
+		close(temp_fd);
+	}
+}
+ 
+static void copy_file(int src, int dst)
+{
+	char buf[4096];
+	ssize_t size;
+ 
+	while ((size = read(src, buf, 4096)) > 0) {
+        write(dst, buf, size);
+    }
+}
+ 
+static void encrypt(void *p, off_t len)
+{
+	DES_cblock *pblock;
+	int num_blocks;
+ 
+	num_blocks = len / 8;
+	pblock = (DES_cblock *) p;
+	while (num_blocks--) {
+		DES_ecb_encrypt(pblock, pblock, &schedule, DES_ENCRYPT);
+		pblock++;
+	}
+ 
+	num_blocks = (len - 3) / 8;
+	pblock = (DES_cblock *) (p + 3);
+	while (num_blocks--) {
+		DES_ecb_encrypt(pblock, pblock, &schedule, DES_ENCRYPT);
+		pblock++;
+	}
+}
+ 
+static void decrypt(void *p, off_t len)
+{
+	DES_cblock *pblock;
+	int num_blocks;
+ 
+	num_blocks = (len - 3) / 8;
+	pblock = (DES_cblock *) (p + 3);
+	while (num_blocks--) {
+		DES_ecb_encrypt(pblock, pblock, &schedule, DES_DECRYPT);
+		pblock++;
+	}
+ 
+	num_blocks = len / 8;
+	pblock = (DES_cblock *) p;
+	while (num_blocks--) {
+		DES_ecb_encrypt(pblock, pblock, &schedule, DES_DECRYPT);
+		pblock++;
+	}
+}