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authorKarl Kurbjun <kkurbjun@gmail.com>2009-08-30 23:24:22 +0000
committerKarl Kurbjun <kkurbjun@gmail.com>2009-08-30 23:24:22 +0000
commitd07ea9a48ed53f3500500a38e254db73cbc0a432 (patch)
treebd74aae290c9d375c8786f048a6c2bc0d89327a0 /tools
parent8af1a65cae553a7f2614a1a5c3e41158f9c8291a (diff)
downloadrockbox-d07ea9a48ed53f3500500a38e254db73cbc0a432.tar.gz
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M:Robe 500: Add firmware patcher: Can decrypt firmware updates, patch them, and re-encrypt them.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22565 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'tools')
-rw-r--r--tools/Makefile9
-rw-r--r--tools/bmp2rb.c17
-rwxr-xr-xtools/configure2
-rw-r--r--tools/mk500boot.c322
-rw-r--r--tools/mr500.c457
-rw-r--r--tools/mr500.h56
6 files changed, 858 insertions, 5 deletions
diff --git a/tools/Makefile b/tools/Makefile
index 43f53e2569..48f4613eb4 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -6,7 +6,7 @@
# \/ \/ \/ \/ \/
# $Id$
#
-CFLAGS := -O -g -W -Wall -Wshadow -pedantic
+CFLAGS := -g -W -Wall -Wshadow -pedantic
LDFLAGS := -g
.PHONY: rbspeexenc uclpack
@@ -16,7 +16,7 @@ CLEANALL := scramble descramble iriver sh2d bmp2rb rdf2binary convbdf \
lngdump telechips gigabeats creative hmac-sha1 mktccboot mknkboot rbspeexenc mkzenboot
all: scramble descramble sh2d rdf2binary mkboot mktccboot mknkboot mkzenboot \
- convbdf codepages uclpack rbspeexenc voicefont
+ convbdf codepages uclpack rbspeexenc voicefont mk500boot
scramble: scramble.o iriver.o mi4.o gigabeat.o gigabeats.o telechips.o iaudio_bl_flash.o creative.o hmac-sha1.o
descramble: descramble.o iriver.o gigabeat.o
@@ -47,7 +47,10 @@ mkboot: mkboot.c
mktccboot: mktccboot.c telechips.o
$(SILENT)$(CC) $(CFLAGS) $+ -o $@
-
+
+mk500boot: mk500boot.c mr500.c
+ $(SILENT)$(CC) $(CFLAGS) $+ -o $@
+
mknkboot: mknkboot.c
$(SILENT)$(CC) $(CFLAGS) $+ -o $@
diff --git a/tools/bmp2rb.c b/tools/bmp2rb.c
index e2e02a2a50..264179a571 100644
--- a/tools/bmp2rb.c
+++ b/tools/bmp2rb.c
@@ -319,6 +319,7 @@ int transform_bitmap(const struct RGBQUAD *src, int width, int height,
case 4: /* 16-bit packed RGB (5-6-5) */
case 5: /* 16-bit packed and byte-swapped RGB (5-6-5) */
+ case 8: /* 16-bit packed RGB (5-6-5) vertical stride*/
dst_w = width;
dst_h = height;
dst_d = 16;
@@ -425,6 +426,19 @@ int transform_bitmap(const struct RGBQUAD *src, int width, int height,
(*dest)[(row/8) * dst_w + col] |= data << (row & 7);
}
break;
+
+ case 8: /* 16-bit packed RGB (5-6-5) vertical stride*/
+ for (row = 0; row < height; row++)
+ for (col = 0; col < width; col++)
+ {
+ unsigned short rgb =
+ (((src[row * width + col].rgbRed >> 3) << 11) |
+ ((src[row * width + col].rgbGreen >> 2) << 5) |
+ ((src[row * width + col].rgbBlue >> 3)));
+
+ (*dest)[col * dst_h + row] = rgb;
+ }
+ break;
}
return 0;
@@ -569,7 +583,8 @@ void print_usage(void)
"\t 4 16-bit packed 5-6-5 RGB (iriver H300)\n"
"\t 5 16-bit packed and byte-swapped 5-6-5 RGB (iPod)\n"
"\t 6 Greyscale iPod 4-grey\n"
- "\t 7 Greyscale X5 remote 4-grey\n");
+ "\t 7 Greyscale X5 remote 4-grey\n"
+ "\t 8 16-bit packed 5-6-5 RGB with a vertical stride\n");
printf("build date: " __DATE__ "\n\n");
}
diff --git a/tools/configure b/tools/configure
index 2f96f377e5..82ff172784 100755
--- a/tools/configure
+++ b/tools/configure
@@ -1598,7 +1598,7 @@ fi
arm926ejscc
tool="$rootdir/tools/scramble -add=m500"
bmp2rb_mono="$rootdir/tools/bmp2rb -f 0"
- bmp2rb_native="$rootdir/tools/bmp2rb -f 4"
+ bmp2rb_native="$rootdir/tools/bmp2rb -f 8"
bmp2rb_remotemono="$rootdir/tools/bmp2rb -f 0"
bmp2rb_remotenative="$rootdir/tools/bmp2rb -f 0"
output="rockbox.mrobe500"
diff --git a/tools/mk500boot.c b/tools/mk500boot.c
new file mode 100644
index 0000000000..1187058091
--- /dev/null
+++ b/tools/mk500boot.c
@@ -0,0 +1,322 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ *
+ * Copyright (C) 2009 by Karl Kurbjun
+ * $Id$
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <string.h>
+#include "mr500.h"
+
+/* This is the patch necessary for the SVG exploit (decrypted) */
+struct patch_single hack[] = { {0x29B28, 0xE12FFF30},
+ {0x2F960, 0xE12FFF30} };
+
+static void usage(void)
+{
+ printf( "Usage: mk500boot <options> <input file> [output file]\n"
+ "options:\n"
+ "\t-decrypt Decrypt the input file and save the output file\n"
+ "\t-encrypt Encrypt the input file and save the output file\n"
+ "\t-patch Patch the input file with the SVF hack\n\n");
+
+ exit(1);
+}
+
+/* This is a fake flag that is used to let the tool know what's up */
+#define HEADER_DECRYPTED 0x8000
+
+void display_header(struct olympus_header *header) {
+ printf("Magic Name: \t%s\n", header->magic_name);
+ printf("Unknown: \t0x%08hX\n", header->unknown);
+ printf("Header Length: \t0x%04X\n", header->header_length);
+ printf("Flags: \t\t0x%04X\n", header->flags);
+ printf("Unknonwn Zeros: 0x%08X\n", header->unknown_zeros);
+ printf("Image Length: \t0x%08X\n", header->image_length);
+}
+
+/* This is a demonstration of the encryption and decryption process.
+ * It patches a FW image to include the SVG exploit.
+ */
+int main (int argc, char *argv[]) {
+ uint32_t checksum;
+ uint32_t stored_crc;
+
+ enum operations {
+ decrypt,
+ encrypt,
+ patch
+ } operation;
+
+ char *encrypt_file;
+ char *decrypt_file;
+
+ struct olympus_header header;
+
+ if (argc < 2) {
+ usage();
+ return -1;
+ }
+
+ if(!strcmp(argv[1], "-decrypt")) {
+ if(argc < 3) {
+ usage();
+ return -1;
+ }
+ encrypt_file=argv[2];
+ decrypt_file=argv[3];
+ operation = decrypt;
+ } else if(!strcmp(argv[1], "-encrypt")) {
+ if(argc < 3) {
+ usage();
+ return -1;
+ }
+ decrypt_file = argv[2];
+ encrypt_file = argv[3];
+ operation = encrypt;
+ } else if(!strcmp(argv[1], "-patch")) {
+ decrypt_file = argv[2];
+ encrypt_file = argv[3];
+ operation = patch;
+ } else {
+ return -1;
+ }
+
+ /* Initialize encryption/decryption routine */
+ mr500_init();
+
+ if(operation == decrypt) {
+ /* Read in the header of the encrypted file */
+ if(mr500_read_header(encrypt_file, &header) < 0 ) {
+ printf("ERROR: Unable to read header: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Read CRC of encrypted file */
+ if(mr500_read_crc(encrypt_file,
+ header.header_length+header.image_length, &stored_crc) < 0 ) {
+ printf("ERROR: Unable to read CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Display the header information */
+ printf("File format:\n");
+
+ printf("*****Header*****\n");
+ display_header(&header);
+ printf("****************\n\n");
+
+ printf("*****Image******\n\n");
+
+ printf("*****Footer*****\n");
+ printf("Checksum: \t0x%08X\n", stored_crc);
+ printf("****************\n\n");
+
+ printf("Writing Decrypted file...\n");
+
+ /*********************************************************************
+ * Save a decrypted file
+ **********************************************************************/
+
+ /* Check to make sure this is a encrypted file (bogus flag not set) */
+ if(header.flags & HEADER_DECRYPTED) {
+ printf("ERROR: This appears to be a decrypted file! Quitting\n");
+ return -1;
+ }
+
+ /* Check to make sure MAGIC string matches expected*/
+ if(strncmp((char *)header.magic_name, "OIMCFWUP", 8)) {
+ printf("ERROR: Magic string does not match expected! Quitting\n");
+ return -1;
+ }
+
+ /* Set a bogus flag to let the tool know that this is a decrypted file*/
+ header.flags |= HEADER_DECRYPTED;
+
+ /* Start by writing out the header */
+ if(mr500_save_header(decrypt_file, &header) < 0 ) {
+ printf("ERROR: Unable to save header: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Read encrypted data and save decrypted data */
+ if(mr500_save_data( encrypt_file, decrypt_file, header.header_length,
+ header.image_length, decrypt_array) < 0 ) {
+ printf("ERROR: Unable to save decrypted data: %s\n", strerror(errno));
+ return -1;
+ }
+
+ printf("Calculating Checksum...\n");
+ /* Calculate CRC of decrypted data */
+ if(mr500_calculate_crc( decrypt_file, header.header_length,
+ header.image_length, &checksum) < 0 ) {
+ printf("ERROR: Unable to calculate CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ printf("Calculated Checksum: \n\t\t0x%08X\n", checksum);
+
+ /* Double check to make sure that the two CRCs match */
+ if(checksum!=stored_crc) {
+ printf("\tERROR: \tCalculated checksum: \t0x%08X and\n", checksum);
+ printf("\t\tStored checksum: \t0x%08X do not match\n", stored_crc);
+ return -1;
+ } else {
+ printf("\tOK: Calculated checksum and stored checksum match.\n");
+ }
+
+ printf("Saving Checksum...\n");
+ /* Save the calculated CRC to the file */
+ if(mr500_save_crc(decrypt_file, header.header_length+header.image_length,
+ &checksum) < 0 ) {
+ printf("ERROR: Unable to save CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ } else if(operation == patch) {
+
+ /**********************************************************************
+ * Patch decryped file with SVG exploit
+ **********************************************************************/
+ printf("Patching decrypted file.\n");
+
+ /* Read in the header of the encrypted file */
+ if(mr500_read_header(decrypt_file, &header) < 0 ) {
+ printf("ERROR: Unable to read header: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Check to make sure this is a decrypted file (bogus flag not set) */
+ if(!(header.flags & HEADER_DECRYPTED)) {
+ printf("ERROR: This appears to be a encrypted file! Quitting\n");
+ return -1;
+ }
+
+ /* Check to make sure MAGIC string matches expected*/
+ if(strncmp((char *)header.magic_name, "OIMCFWUP", 8)) {
+ printf("ERROR: Magic string does not match expected! Quitting\n");
+ return -1;
+ }
+
+ printf("File Header:\n");
+ display_header(&header);
+
+ if(mr500_patch_file (decrypt_file, hack, 2) < 0 ) {
+ printf("ERROR: Unable to patch file: %s\n", strerror(errno));
+ return -1;
+ }
+
+ printf("\nCalculating new CRC\n");
+
+ /* Calculate the 'CRC' of the patched file */
+ if(mr500_calculate_crc( decrypt_file, header.header_length,
+ header.image_length, &checksum) < 0 ) {
+ printf("ERROR: Unable to calculate CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ printf("Calculated CRC: \n\t\t0x%08X\n", checksum);
+ /* Store the calculated 'CRC' (not encrypted) */
+ if(mr500_save_crc(decrypt_file, header.header_length+header.image_length,
+ &checksum) < 0 ) {
+ printf("ERROR: Unable to save CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ } else if(operation == encrypt) {
+
+ /**********************************************************************
+ * Save an encrypted file
+ **********************************************************************/
+ printf("Saving Encrypted file\n");
+
+ /* Read in the header of the encrypted file */
+ if(mr500_read_header(decrypt_file, &header) < 0 ) {
+ printf("ERROR: Unable to read header: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Check to make sure this is a decrypted file (bogus flag not set) */
+ if(!(header.flags & HEADER_DECRYPTED)) {
+ printf("ERROR: This appears to be a encrypted file! Quitting\n");
+ return -1;
+ }
+
+ /* Check to make sure MAGIC string matches expected*/
+ if(strncmp((char *)header.magic_name, "OIMCFWUP", 7)) {
+ printf("ERROR: Magic string does not match expected! Quitting\n");
+ return -1;
+ }
+
+ /* Remove the bogus flag */
+ header.flags &= ~HEADER_DECRYPTED;
+
+ printf("File Header:\n");
+ display_header(&header);
+
+ /* Header is not encrypted, save it */
+ if(mr500_save_header(encrypt_file, &header) < 0 ) {
+ printf("ERROR: Unable to save header: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Read CRC of decrypted file */
+ if(mr500_read_crc(decrypt_file,
+ header.header_length+header.image_length, &stored_crc) < 0 ) {
+ printf("ERROR: Unable to read CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* Calculate the 'CRC' of the decrypted data */
+ if(mr500_calculate_crc( decrypt_file, header.header_length,
+ header.image_length, &checksum) < 0 ) {
+ printf("ERROR: Unable to calculate CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ if(stored_crc != checksum) {
+ printf("\nERROR: Stored and calculated checksums do not match!\n"
+ "\tFile has been improperly modified. Quitting\n");
+ return -1;
+ }
+
+ printf("Encrypting data...\n");
+
+ /* Write the encrypted data to a file */
+ if(mr500_save_data( decrypt_file, encrypt_file, header.header_length,
+ header.image_length, encrypt_array) < 0 ) {
+ printf("ERROR: Unable to save encrypted data: %s\n", strerror(errno));
+ return -1;
+ }
+
+ printf("Saving CRC\n");
+
+ /* Store the calculated 'CRC' (not encrypted) */
+ if(mr500_save_crc(encrypt_file, header.header_length+header.image_length,
+ &checksum) < 0 ) {
+ printf("ERROR: Unable to save CRC: %s\n", strerror(errno));
+ return -1;
+ }
+
+ printf("File sucesfully encrypted!\n");
+ }
+
+ printf("Done\n");
+ return 0;
+}
+
diff --git a/tools/mr500.c b/tools/mr500.c
new file mode 100644
index 0000000000..00cf17e26b
--- /dev/null
+++ b/tools/mr500.c
@@ -0,0 +1,457 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ *
+ * Copyright (C) 2009 by Karl Kurbjun
+ * based on work by Shirour:
+ * http://www.mrobe.org/forum/viewtopic.php?f=6&t=2176
+ * $Id$
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include "mr500.h"
+
+/* Notes about firmware:
+ * These notes are based on the work and observations of Shirour on the M:Robe
+ * forums.
+ *
+ * The firmware for the M:Robe has basic encryption on it. The data is XORed
+ * and scrambled. The mr500_save_data function provides an implemenation of the
+ * encryption/decryption.
+ *
+ * When a firmware update is done the "{#4F494D4346575550#}" folder is stored
+ * in the system folder on the player. The "{#4F494D4346575550#}" should only
+ * contain the encrypted N5002-BD.BIN file. At the end of a firmware update
+ * the "{#4F494D4346575550#}" folder and it's contents are removed from the
+ * player.
+ *
+ * An interesting note is that the name "{#4F494D4346575550#}" is actually the
+ * Hex representation of the magic text found at the beginning of the firmware
+ * image "OIMCFWUP".
+ */
+
+/* These two arrays are used for descrambling or scrambling the data */
+int decrypt_array[16]={2, 0, 3, 1, 5, 7, 4, 6, 11, 10, 9, 8, 14, 12, 13, 15};
+int encrypt_array[16];
+
+/* mr500_patch_file: This function modifies the specified file with the patches
+ * struct.
+ *
+ * Parameters:
+ * filename: text filename
+ * patches: pointer to structure array of patches
+ * num_patches: number of patches to apply (applied in reverse order)
+ *
+ * Returns:
+ * Returns 0 if there was no error, -1 if there was an error
+ */
+int mr500_patch_file(char *filename, struct patch_single *patches,
+ int num_patches) {
+ int fdo;
+ int ret=0;
+ uint32_t endian_int;
+
+ /* Open the file write only. */
+ fdo = open(filename, O_WRONLY);
+
+ if(fdo<0) {
+ ret=-1;
+ }
+
+ while(num_patches--) {
+ /* seek to patch offset */
+ if(lseek(fdo, patches[num_patches].offset, SEEK_SET)
+ != patches[num_patches].offset) {
+ ret=-1;
+ break;
+ }
+
+ /* Make sure patch is written in little endian format */
+ endian_int = htole32(patches[num_patches].value);
+
+ /* Write the patch value to the file */
+ if(write(fdo, (void *) &endian_int, sizeof(endian_int)) < 0) {
+ ret = -1;
+ break;
+ }
+ }
+
+ /* Close the file and check for errors */
+ if(close (fdo) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* mr500_save_header: This function saves the Olympus header to the firmware
+ * image. The values stored in the header are explained above. Note that this
+ * will truncate a file. The header is stored in little endian format.
+ *
+ * Parameters:
+ * filename: text filename
+ * header: pointer to header structure to be saved
+ *
+ * Returns:
+ * Returns 0 if there was no error, -1 if there was an error
+ */
+int mr500_save_header(char *filename, struct olympus_header *header) {
+ int fdo;
+ int ret=0;
+
+ /* Temporary header used for storing the header in little endian. */
+ struct olympus_header save;
+
+ /* Open the file write only and truncate it. If it doesn't exist create. */
+ fdo = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
+
+ if(fdo<0) {
+ ret=-1;
+ }
+
+ /* Header is stored at offset 0 (Not really needed) */
+ if(lseek(fdo, 0, SEEK_SET) != 0) {
+ ret=-1;
+ }
+
+ /* Convert header to Little Endian */
+ memcpy(&save.magic_name, &header->magic_name, 8*sizeof(int8_t));
+ save.unknown = htole32(header->unknown);
+ save.header_length = htole16(header->header_length);
+ save.flags = htole16(header->flags);
+ save.unknown_zeros = htole32(header->unknown_zeros);
+ save.image_length = htole32(header->image_length);
+
+ /* Write the header to the file */
+ if(write(fdo, (void *) &save, sizeof(save)) < 0) {
+ ret = -1;
+ }
+
+ /* Close the file and check for errors */
+ if(close (fdo) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* mr500_read_header: This function reads the Olympus header and converts it to
+ * the host endian format. The values stored in the header are explained above.
+ * The header is stored in little endian format.
+ *
+ * Parameters:
+ * filename: text filename
+ * header: pointer to header structure to store header read from file
+ *
+ * Returns:
+ * Returns 0 if there was no error, -1 if there was an error
+ */
+int mr500_read_header(char *filename, struct olympus_header *header) {
+ int fdi;
+ int ret = 0;
+
+ /* Open the file read only */
+ fdi = open(filename, O_RDONLY);
+
+ if(fdi<0) {
+ ret=-1;
+ }
+
+ /* Header is stored at offset 0 (Not really needed) */
+ if(lseek(fdi, 0, SEEK_SET) != 0) {
+ ret=-1;
+ }
+
+ /* Read in the header */
+ if(read(fdi, (void *) header, sizeof(*header)) < 0) {
+ ret = -1;
+ }
+
+ /* Convert header to system endian */
+ header->unknown = le32toh(header->unknown);
+ header->header_length = le16toh(header->header_length);
+ header->flags = le16toh(header->flags);
+ header->unknown_zeros = le32toh(header->unknown_zeros);
+ header->image_length = le32toh(header->image_length);
+
+ /* Close the file and check for errors */
+ if(close (fdi) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* mr500_save_crc: This function saves the 'CRC' of the Olympus firmware image.
+ * Note that the 'CRC' must be calculated on the decrytped image. It is stored
+ * in little endian.
+ *
+ * Parameters:
+ * filename: text filename
+ * offset: Offset to store the 'CRC' (header size + data size)
+ * crc_value: pointer to crc value to save
+ *
+ * Returns:
+ * Returns 0 if there was no error, -1 if there was an error
+ */
+int mr500_save_crc(char *filename, off_t offset, uint32_t *crc_value) {
+ int fdo;
+ int ret = 0;
+ uint32_t save_crc;
+
+ /* Open the file write only */
+ fdo = open(filename, O_WRONLY);
+
+ if(fdo<0) {
+ ret=-1;
+ }
+
+ /* Seek to offset and check for errors */
+ if(lseek(fdo, offset, SEEK_SET) != offset) {
+ ret=-1;
+ }
+
+ /* Convert 'CRC' to little endian from system native endian */
+ save_crc = htole32(*crc_value);
+
+ /* Write the 'CRC' and check for errors */
+ if(write(fdo, (void *) &save_crc, sizeof(unsigned int)) < 0) {
+ ret = -1;
+ }
+
+ /* Close the file and check for errors */
+ if(close (fdo) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* mr500_read_crc: This function reads the 'CRC' of the Olympus firmware image.
+ * Note that the 'CRC' is calculated on the decrytped values. It is stored
+ * in little endian.
+ *
+ * Parameters:
+ * filename: text filename
+ * offset: Offset to read the 'CRC' (header size + data size)
+ * crc_value: pointer to crc value to save
+ *
+ * Returns:
+ * Returns 0 if there was no error, -1 if there was an error
+ */
+int mr500_read_crc(char *filename, off_t offset, uint32_t *crc_value) {
+ int fdi;
+ int ret = 0;
+
+ /* Open the file read only */
+ fdi = open(filename, O_RDONLY);
+
+ if(fdi<0) {
+ ret = -1;
+ }
+
+ /* Seek to offset and check for errors */
+ if(lseek(fdi, offset, SEEK_SET) != offset) {
+ ret=-1;
+ }
+
+ /* Read in the 'CRC' */
+ if(read(fdi, (void *) crc_value, sizeof(uint32_t)) < 0) {
+ ret = -1;
+ }
+
+ /* Convert the 'CRC' from little endian to system native format */
+ *crc_value = le32toh(*crc_value);
+
+ /* Close the file and check for errors */
+ if(close (fdi) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* mr500_calculate_crc: This function calculates the 'CRC' of the Olympus
+ * firmware image. Note that the 'CRC' must be calculated on decrytped values.
+ * It is stored in little endian.
+ *
+ * Parameters:
+ * filename: text filename
+ * offset: Offset to the start of the data (header size)
+ * length: Length of data to calculate
+ * crc_value: pointer to crc value to save
+ *
+ * Returns:
+ * Returns 0 if there was no error, -1 if there was an error
+ */
+int mr500_calculate_crc( char *filename, off_t offset, unsigned int length,
+ uint32_t *crc_value){
+ uint32_t temp;
+ int fdi;
+ int ret = 0;
+
+ /* Open the file read only */
+ fdi = open(filename, O_RDONLY);
+
+ if(fdi<0) {
+ ret = -1;
+ }
+
+ /* Seek to offset and check for errors */
+ if(lseek(fdi, offset, SEEK_SET) != offset) {
+ ret=-1;
+ }
+
+ /* Initialize the crc_value to make sure this starts at 0 */
+ *crc_value = 0;
+ /* Run this loop till the entire sum is created */
+ do {
+ /* Read an integer at a time */
+ if(read(fdi, &temp, sizeof(uint32_t)) < 0) {
+ ret = -1;
+ break;
+ }
+
+ /* Keep summing the values */
+ *crc_value+=temp;
+ } while (length-=4);
+
+ /* Close the file and check for errors */
+ if(close (fdi) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* mr500_save_data: This function encypts or decrypts the Olympus firmware
+ * image based on the dictionary passed to it.
+ *
+ * Parameters:
+ * source_filename: text filename where data is read from
+ * dest_filename: text filename where data is written to
+ * offset: Offset to the start of the data (header size)
+ * length: Length of data to modify
+ * dictionary: pointer to dictionary used for scrambling
+ *
+ * Returns:
+ * Returns 0 if there was no error, -1 if there was an error
+ */
+int mr500_save_data(
+ char *source_filename, char *dest_filename, off_t offset,
+ unsigned int length, int* dictionary) {
+ int fdi, fdo;
+ int ret = 0;
+ int i;
+
+ /* read_count stores the number of bytes actually read */
+ int read_count;
+
+ /* read_request stores the number of bytes to be requested */
+ int read_request;
+
+ /* These two buffers are used for reading data and scrambling or
+ * descrambling
+ */
+ int8_t buffer_original[16];
+ int8_t buffer_modified[16];
+
+ /* Open input read only, output write only */
+ fdi = open(source_filename, O_RDONLY);
+ fdo = open(dest_filename, O_WRONLY);
+
+ /* If there was an error loading the files set ret appropriately */
+ if(fdi<0 || fdo < 0) {
+ ret = -1;
+ }
+
+ /* Input file: Seek to offset and check for errors */
+ if(lseek(fdi, offset, SEEK_SET) != offset) {
+ ret=-1;
+ }
+
+ /* Output file: Seek to offset and check for errors */
+ if(lseek(fdo, offset, SEEK_SET) != offset) {
+ ret=-1;
+ }
+
+ /* Run this loop till size is 0 */
+ do {
+ /* Choose the amount of data to read - normally in 16 byte chunks, but
+ * when the end of the file is near may be less.
+ */
+ if( length > sizeof(buffer_original)){
+ read_request = sizeof(buffer_original);
+ } else {
+ read_request = length;
+ }
+
+ /* Read in the data */
+ read_count = read(fdi, (void *) &buffer_original, read_request);
+
+ /* If there was an error set the flag and break */
+ if(read_count < 0) {
+ ret = -1;
+ break;
+ }
+
+ for(i=0; i<read_count; i++) {
+ /* XOR all of the bits to de/encrypt them */
+ buffer_original[i] ^= 0xFF;
+ /* Handle byte scrambling */
+ buffer_modified[dictionary[i]] = buffer_original[i];
+ }
+
+ /* write the data: If there was an error set the flag and break */
+ if(write(fdo, (void *) &buffer_modified, read_count) < 0) {
+ ret = -1;
+ break;
+ }
+ } while (length -= read_count);
+
+ /* Close the files and check for errors */
+ if(close (fdi) < 0) {
+ ret = -1;
+ }
+ if(close (fdo) < 0) {
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* mr500_init: This function initializes the encryption array
+ *
+ * Parameters:
+ * None
+ *
+ * Returns:
+ * Returns 0
+ */
+int mr500_init(void) {
+ int i;
+ /* Initialize the encryption array */
+ for(i=0; i<16; i++) {
+ encrypt_array[decrypt_array[i]]=i;
+ }
+ return 0;
+}
+
diff --git a/tools/mr500.h b/tools/mr500.h
new file mode 100644
index 0000000000..f9a651f923
--- /dev/null
+++ b/tools/mr500.h
@@ -0,0 +1,56 @@
+/***************************************************************************
+ * __________ __ ___.
+ * Open \______ \ ____ ____ | | _\_ |__ _______ ___
+ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
+ * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
+ * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
+ * \/ \/ \/ \/ \/
+ *
+ * Copyright (C) 2009 by Karl Kurbjun
+ * $Id$
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include <stdlib.h>
+extern int decrypt_array[];
+extern int encrypt_array[];
+
+/* Notes about the header:
+ * The magic_name should always be "OIMCFWUP"
+ * Header length is always 18 bytes
+ * The flags have the following mask:
+ * CHECK_CRC 0x01 : Tells the firmware whether or not to check CRC
+ * ENDIAN_MODE 0x02 : Tells the OF whether to re-order the bytes
+ * The rest are unknown
+ * The image length is in bytes and is always 0x007F0000
+ */
+struct olympus_header {
+ int8_t magic_name[8];
+ uint32_t unknown;
+ uint16_t header_length;
+ uint16_t flags;
+ uint32_t unknown_zeros;
+ uint32_t image_length;
+} __attribute__((__packed__));
+
+/* Patch entries should be saved in little endian format */
+struct patch_single {
+ off_t offset;
+ uint32_t value;
+};
+
+int mr500_patch_file(char *, struct patch_single *, int);
+int mr500_save_header(char *, struct olympus_header *);
+int mr500_read_header(char *, struct olympus_header *);
+int mr500_save_crc(char *, off_t, uint32_t *);
+int mr500_read_crc(char *, off_t, uint32_t *);
+int mr500_calculate_crc(char *, off_t, unsigned int, uint32_t *);
+int mr500_save_data(char *, char *, off_t, unsigned int, int*);
+int mr500_init(void);
+