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rockbox/rbutil/mkzenboot/mkzenboot.c
Amaury Pouly 5a3b30d8fd Add support for ZEN Mozaic firmware Version 1.06.01 to mkzenboot 
Change-Id: I7d912c50ae14e186cb2a2d0f66b876cfe9ff3028
2017-11-04 22:58:29 +01:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Maurus Cuelenaere
* Based on zenutils by Rasmus Ry <rasmus.ry{at}gmail.com>
* Copyright (C) 2013 by Amaury Pouly
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include "mkzenboot.h"
#include "utils.h"
#include "dualboot.h"
/**
* Keys used by players
*/
static const char null_key_v1[] = "CTL:N0MAD|PDE0.SIGN.";
static const char null_key_v2[] = "CTL:N0MAD|PDE0.DPMP.";
static const char null_key_v3[] = "CTL:N0MAD|PDE0.DPFP.";
static const char null_key_v4[] = "CTL:Z3N07|PDE0.DPMP.";
static const char tl_zvm_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen Vision:M";
static const char tl_zvm60_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen Vision:M (D"
"VP-HD0004)";
static const char tl_zen_key[] = "1sN0TM3D az u~may th1nk*"
"Creative ZEN";
static const char tl_zenxf_key[] = "1sN0TM3D az u~may th1nk*"
"Creative ZEN X-Fi";
static const char tl_zenmo_key[] = "1sN0TM3D az u~may th1nk*"
"Creative ZEN Mozaic";
static const char tl_zv_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen Vision";
static const char tl_zvw_key[] = "1sN0TM3D az u~may th1nk*"
"Creative ZEN Vision W";
static const char tl_zm_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen Micro";
static const char tl_zmp_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen MicroPhoto";
static const char tl_zs_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen Sleek";
static const char tl_zsp_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen Sleek Photo";
static const char tl_zt_key[] = "1sN0TM3D az u~may th1nk*"
"Creative Zen Touch";
static const char tl_zx_key[] = "1sN0TM3D az u~may th1nk*"
"NOMAD Jukebox Zen Xtra";
static const char tl_zenv_key[] = "1sN0TM3D az u~may th1nk*"
"Creative ZEN V";
static const char tl_zenvp_key[] = "1sN0TM3D az u~may th1nk*"
"Creative ZEN V Plus";
static const char tl_zenvv_key[] = "1sN0TM3D az u~may th1nk*"
"Creative ZEN V (Video)";
struct player_info_t
{
const char* name;
const char* null_key; /* HMAC-SHA1 key */
const char* tl_key; /* BlowFish key */
bool big_endian;
char *cinf;
};
static struct player_info_t zen_players[] =
{
{"Zen Vision:M", null_key_v2, tl_zvm_key, false, NULL},
{"Zen Vision:M 60GB", null_key_v2, tl_zvm60_key, false, NULL},
{"Zen", null_key_v4, tl_zen_key, false, "Creative ZEN"},
{"Zen X-Fi", null_key_v4, tl_zenxf_key, false, "Creative ZEN X-Fi"},
{"Zen Mozaic", null_key_v4, tl_zenmo_key, false, "Creative ZEN Mozaic"},
{"Zen Vision", null_key_v2, tl_zv_key, false, NULL},
{"Zen Vision W", null_key_v2, tl_zvw_key, false, NULL},
{"Zen Micro", null_key_v1, tl_zm_key, true, NULL},
{"Zen MicroPhoto", null_key_v1, tl_zmp_key, true, NULL},
{"Zen Sleek", null_key_v1, tl_zs_key, true, NULL},
{"Zen SleekPhoto", null_key_v1, tl_zsp_key, true, NULL},
{"Zen Touch", null_key_v1, tl_zt_key, true, NULL},
{"Zen Xtra", null_key_v1, tl_zx_key, true, NULL},
{"Zen V", null_key_v3, tl_zenv_key, false, "Creative ZEN V"},
{"Zen V Plus", null_key_v3, tl_zenvp_key, false, NULL},
{"Zen V Video", null_key_v3, tl_zenvv_key, false, NULL},
{NULL, NULL, NULL, false, NULL}
};
/**
* Information on how to patch firmwares
*/
struct zen_model_desc_t
{
/* Descriptive name of this model (must match player in zen_players[]) */
const char *model_name;
/* Model name used in the Rockbox header in ".zen" files - these match the
-add parameter to the "scramble" tool */
const char *rb_model_name;
/* Model number used to initialise the checksum in the Rockbox header in
".zen" files - these are the same as MODEL_NUMBER in config-target.h */
const int rb_model_num;
/* Bootloader load address */
uint32_t bootloader_addr;
/* Dualboot code for this model */
const unsigned char *dualboot;
/* Size of dualboot functions for this model */
int dualboot_size;
};
/* keep this consistent with the address in dualboot.lds */
static const struct zen_model_desc_t zen_models[] =
{
[MODEL_UNKNOWN] =
{
"Unknown", " ", 0, 0, NULL, 0
},
[MODEL_ZENV] =
{
"Zen V", "zenv", 92, 0x61000000, dualboot_zenv, sizeof(dualboot_zenv)
},
[MODEL_ZENXFI] =
{
"Zen X-Fi", "zxfi", 86, 0x41000000, dualboot_zenxfi, sizeof(dualboot_zenxfi)
},
[MODEL_ZENMOZAIC] =
{
"Zen Mozaic", "zmoz", 87, 0x41000000, dualboot_zenmozaic, sizeof(dualboot_zenmozaic)
},
[MODEL_ZEN] =
{
"Zen", "zen", 90, 0x41000000, dualboot_zen, sizeof(dualboot_zen)
},
};
/**
* MD5 knowledge base
*/
struct zen_md5sum_t
{
/* Device model */
enum zen_model_t model;
/* md5sum of the file */
char *md5sum;
/* Version string */
const char *version;
};
static const struct zen_md5sum_t zen_sums[] =
{
/** Zen Mozaic */
{
/* Version 1.06.01 */
MODEL_ZENMOZAIC, "8441402a8db9f92659b05f05c0abe8fb", "1.06.01"
},
{
/* Version 1.06.01e */
MODEL_ZENMOZAIC, "88a856f8273b2bc3fcacf1f067a44aa8", "1.06.01e"
},
/** Zen X-Fi */
{
/* Version 1.04.08e */
MODEL_ZENXFI, "f07e2e75069289a2aa14c6583bd9643b", "1.04.08e"
},
{
/* Version 1.04.08 */
MODEL_ZENXFI, "c3cddf8468d8c8982e93aa9986c5a152", "1.04.08"
},
/** Zen V */
{
/* Version 1.32.01e */
MODEL_ZENV, "2f6d3e619557583c30132ac87221bc3e", "1.32.01e"
},
/** Zen */
{
/* Version 1.21.03e */
MODEL_ZEN, "1fe28f587f87ac3c280281db28c42465", "1.21.03e"
}
};
#define NR_ZEN_PLAYERS (sizeof(zen_players) / sizeof(zen_players[0]))
#define NR_ZEN_SUMS (sizeof(zen_sums) / sizeof(zen_sums[0]))
#define NR_ZEN_MODELS (sizeof(zen_models) / sizeof(zen_models[0]))
#define MAGIC_ROCK 0x726f636b /* 'rock' */
#define MAGIC_RECOVERY 0xfee1dead
#define MAGIC_NORMAL 0xcafebabe
/**
* Stolen from various places in our codebase
*/
/**
* EDOC file format
*/
struct edoc_header_t
{
char magic[4];
uint32_t total_size;
uint32_t zero;
};
struct edoc_section_header_t
{
uint32_t addr;
uint32_t size;
uint32_t checksum;
};
uint32_t edoc_checksum(void *buffer, size_t size)
{
uint32_t c = 0;
uint32_t *p = buffer;
while(size >= 4)
{
c += *p + (*p >> 16);
p++;
size -= 4;
}
if(size != 0)
printf("[WARN] EDOC Checksum section size is not a multiple of 4 bytes, result is undefined!\n");
return c & 0xffff;
}
#define errorf(err, ...) do { printf(__VA_ARGS__); return err; } while(0)
/**
* How does patching code work
* ---------------------------
*
* All Creative firmwares work the same: they start at 0 and the code sequence at
* 0 always contains the vector table with ldr with offsets:
* 0: e59ff018 ldr pc, [pc, #24] ; 0x20
* 4: e59ff018 ldr pc, [pc, #24] ; 0x24
* 8: e59ff018 ldr pc, [pc, #24] ; 0x28
* c: e59ff018 ldr pc, [pc, #24] ; 0x2c
* 10: e59ff018 ldr pc, [pc, #24] ; 0x30
* 14: e59ff018 ldr pc, [pc, #24] ; 0x34
* 18: e59ff018 ldr pc, [pc, #24] ; 0x38
* 1c: e59ff018 ldr pc, [pc, #24] ; 0x3c
* 20: 0000dbd4 .word start
* 24: 0000dcac .word undef_instr_handler
* 28: 0000dcb0 .word software_int_handler
* 2c: 0000dcb4 .word prefetch_abort_handler
* 30: 0000dcb8 .word data_abort_handler
* 34: 0000dcbc .word reserved_handler
* 38: 0000dcc0 .word irq_handler
* 3c: 0000dd08 .word fiq_handler
*
* To build a dual-boot image, we modify the start address to point to some
* code we added to the image. Specifically we first add the stub, then
* the rockbox image. We also write the old start address to this
* stub so that it can either decide to run rockbox or patch back the
* start address and jump to 0.
* Singleboot and recovery is handled the same way except that both targets use
* the same address and we drop the OF, so we create a fake vector table!
*/
struct dualboot_footer_t
{
uint32_t magic;
uint32_t of_addr;
uint32_t rb_addr;
uint32_t boot_arg;
} __attribute__((packed));
#define FOOTER_MAGIC 0x1ceb00da
static enum zen_error_t create_fake_image(uint8_t **fw, uint32_t *fw_size)
{
/** We need to create a fake EDOC image, so first a header and one section
* header with one data chunk. */
/** The fake image is as follows:
* 0: e59ff018 ldr pc, [pc, #24] ; 0x20
* 4: e59ff018 ldr pc, [pc, #24] ; 0x24
* 8: e59ff018 ldr pc, [pc, #24] ; 0x28
* c: e59ff018 ldr pc, [pc, #24] ; 0x2c
* 10: e59ff018 ldr pc, [pc, #24] ; 0x30
* 14: e59ff018 ldr pc, [pc, #24] ; 0x34
* 18: e59ff018 ldr pc, [pc, #24] ; 0x38
* 1c: e59ff018 ldr pc, [pc, #24] ; 0x3c
* 20: 00000040 .word hang
* 24: 00000040 .word hang
* 28: 00000040 .word hang
* 2c: 00000040 .word hang
* 30: 00000040 .word hang
* 34: 00000040 .word hang
* 38: 00000040 .word hang
* 3c: 00000040 .word hang
* 40 <hang>:
* 40: eafffffe b 40 <hang> */
*fw_size = sizeof(struct edoc_header_t) + sizeof(struct edoc_section_header_t) + 0x44;
*fw = malloc(*fw_size);
if(*fw == NULL)
errorf(ZEN_ERROR, "[ERR] Allocation failed");
struct edoc_header_t *hdr = (void *)*fw;
memcpy(hdr->magic, "EDOC", 4);
hdr->total_size = *fw_size - sizeof(struct edoc_header_t) + 4;
hdr->zero = 0;
struct edoc_section_header_t *sec = (void *)(hdr + 1);
sec->addr = 0;
sec->size = 0x44;
uint32_t *p = (void *)(sec + 1);
p[0] = p[1] = p[2] = p[3] = p[4] = p[5] = p[6] = p[7] = 0xe59ff018;
p[8] = p[9] = p[10] = p[11] = p[12] = p[13] = p[14] = p[15] = 0x40;
p[16] = 0xeafffffe;
sec->checksum = edoc_checksum(p, 0x44);
return ZEN_SUCCESS;
}
static enum zen_error_t patch_firmware(uint8_t **fw, uint32_t *fw_size,
void *boot, size_t boot_size, struct zen_option_t opt)
{
/* check if dualboot stub is available */
const void *dualboot = zen_models[opt.model].dualboot;
int dualboot_size = zen_models[opt.model].dualboot_size;
uint32_t dualboot_addr = zen_models[opt.model].bootloader_addr;
if(dualboot == NULL)
errorf(ZEN_DONT_KNOW_HOW_TO_PATCH, "[ERR] I don't have a dualboot stub for this model\n");
/* if not asked to dualboot, drop OF and create a fake image */
if(opt.output != ZEN_DUALBOOT)
{
enum zen_error_t ret = create_fake_image(fw, fw_size);
if(ret != ZEN_SUCCESS)
return ret;
}
/* compute final image size: add stub + bootloader in one block as a section */
int extra_size = sizeof(struct edoc_section_header_t) + dualboot_size + boot_size;
*fw_size += extra_size;
*fw = realloc(*fw, *fw_size);
if(*fw == NULL)
errorf(ZEN_ERROR, "[ERR] Allocation failed");
/* sanity check */
struct edoc_header_t *hdr = (void *)*fw;
if(memcmp(hdr->magic, "EDOC", 4) != 0)
errorf(ZEN_FW_INVALID, "[ERR] Firmware doesn't use EDOC format\n");
/* validate image and find OF start addr */
uint32_t of_addr = 0;
struct edoc_section_header_t *sec_hdr = (void *)(hdr + 1);
while((void *)sec_hdr - (void *)&hdr->zero < hdr->total_size)
{
if(sec_hdr->checksum != edoc_checksum(sec_hdr + 1, sec_hdr->size))
errorf(ZEN_FW_INVALID, "[ERR] Firmware checksum error\n");
if(sec_hdr->addr == 0)
{
uint32_t *start_vector = ((void *)(sec_hdr + 1) + 0x20);
/* extract address */
of_addr = *(uint32_t *)start_vector;
/* patch vector */
*start_vector = dualboot_addr;
/* fix checksum */
sec_hdr->checksum = edoc_checksum(sec_hdr + 1, sec_hdr->size);
}
sec_hdr = (void *)(sec_hdr + 1) + sec_hdr->size;
}
if(of_addr == 0)
errorf(ZEN_FW_INVALID, "[ERR] Firmware doesn't have the expected format\n");
printf("[INFO] OF start address: %#x\n", of_addr);
/* add extra section */
sec_hdr->addr = dualboot_addr;
sec_hdr->size = dualboot_size + boot_size;
/* add extra data */
memcpy(sec_hdr + 1, dualboot, dualboot_size);
memcpy((void *)(sec_hdr + 1) + dualboot_size, boot, boot_size);
/* locate and patch dualboot footer */
struct dualboot_footer_t *footer = (void *)(sec_hdr + 1) + dualboot_size -
sizeof(struct dualboot_footer_t);
if(footer->magic != FOOTER_MAGIC)
errorf(ZEN_FW_INVALID, "[ERR] Footer magic mismatch\n");
uint32_t rb_addr = dualboot_addr + dualboot_size;
printf("[INFO] RB start address: %#x\n", rb_addr);
footer->of_addr = opt.output == ZEN_DUALBOOT ? of_addr : rb_addr;
footer->rb_addr = rb_addr;
footer->boot_arg = opt.output == ZEN_RECOVERY ? 0xfee1dead : 0xcafebabe;
printf("[INFO] Footer: 0x%08x 0x%08x 0x%08x\n", footer->of_addr, footer->rb_addr,
footer->boot_arg);
/* fix image */
sec_hdr->checksum = edoc_checksum(sec_hdr + 1, sec_hdr->size);
hdr->total_size += extra_size;
return ZEN_SUCCESS;
}
struct player_info_t *get_player_info(enum zen_model_t model)
{
for(int i = 0; zen_players[i].name; i++)
if(strcmp(zen_models[model].model_name, zen_players[i].name) == 0)
return &zen_players[i];
return NULL;
}
enum zen_error_t build_firmware(void *exec, size_t exec_size, void *boot, size_t boot_size,
const char *outfile, struct zen_option_t opt)
{
uint8_t *buffer = exec;
/** find player info */
struct player_info_t *player = get_player_info(opt.model);
if(player == NULL)
errorf(ZEN_UNSUPPORTED, "[ERR] There is no player info for this model\n");
if(player->big_endian)
errorf(ZEN_UNSUPPORTED, "[ERR] Big-endian players are currently unsupported\n");
/** Find Win32 PE .data section */
uint32_t data_ptr;
uint32_t data_size;
enum zen_error_t err = find_pe_data(exec, exec_size, &data_ptr, &data_size);
if(err != ZEN_SUCCESS)
errorf(err, "[ERR] Cannot find .data section\n");
printf("[INFO] .data section is at 0x%x with size 0x%x\n", data_ptr, data_size);
/** look for firmware and key in data section */
uint32_t fw_offset = find_firmware_offset(&buffer[data_ptr], data_size);
if(fw_offset == 0)
errorf(ZEN_FW_INVALID, "[ERR] Couldn't find firmware offset\n");
uint32_t fw_size = le2int(&buffer[data_ptr + fw_offset]);
printf("[INFO] Firmware offset is at 0x%x with size 0x%x\n", data_ptr + fw_offset, fw_size);
const char *fw_key = find_firmware_key(exec, exec_size);
if(fw_key == NULL)
errorf(ZEN_FW_INVALID, "[ERR] Couldn't find firmware key\n");
printf("[INFO] Firmware key is %s\n", fw_key);
/** descramble firmware */
printf("[INFO] Descrambling firmware... ");
if(!crypt_firmware(fw_key, &buffer[data_ptr + fw_offset + 4], fw_size))
errorf(ZEN_ERROR, "Fail!\n");
else
printf("Done!\n");
/** decompress it */
uint8_t *out_buffer = malloc(fw_size * 2);
if(out_buffer == NULL)
errorf(ZEN_ERROR, "[ERR] Couldn't allocate memory");
memset(out_buffer, 0, fw_size * 2);
printf("[INFO] Decompressing firmware... ");
char *err_msg;
if(!inflate_to_buffer(&buffer[data_ptr + fw_offset + 4], fw_size, out_buffer,
fw_size * 2, &err_msg))
errorf(ZEN_ERROR, "Fail!\n[ERR] ZLib error: %s\n", err_msg);
else
printf("Done!\n");
/** check format and resize the buffer */
if(memcmp(out_buffer, "FFIC", 4) != 0)
errorf(ZEN_FW_INVALID, "[ERR] CIFF header doesn't match\n");
uint32_t ciff_size = le2int(&out_buffer[4]) + 8 + 28; /* CIFF block + NULL block*/
printf("[INFO] Total firmware size: %d\n", ciff_size);
out_buffer = realloc(out_buffer, ciff_size);
if(out_buffer == NULL)
errorf(ZEN_ERROR, "[ERR] Cannot resize memory block\n");
/** look for firmware file */
printf("[INFO] Locating encoded block... ");
uint32_t fw_off = 8;
uint8_t *cinf_ptr = NULL;
while(memcmp(&out_buffer[fw_off], " LT\xa9", 4) != 0 && fw_off < ciff_size)
{
if(memcmp(&out_buffer[fw_off], "FNIC", 4) == 0)
{
cinf_ptr = &out_buffer[fw_off + 8];
fw_off += 4 + 4 + 96;
}
else if(memcmp(&out_buffer[fw_off], "ATAD", 4) == 0)
{
fw_off += 4;
fw_off += le2int(&out_buffer[fw_off]);
fw_off += 4;
}
else
errorf(ZEN_FW_INVALID, "Fail!\n[ERR] Unknown block\n");
}
if(fw_off >= ciff_size || memcmp(&out_buffer[fw_off], " LT\xa9", 4) != 0)
errorf(ZEN_FW_INVALID, "Fail!\n[ERR] Couldn't find encoded block\n");
if(!cinf_ptr)
errorf(ZEN_FW_INVALID, "Fail!\n[ERR] Couldn't find CINF\n");
printf("Done!\n");
/** validate player if possible */
printf("[INFO] Checking player model...");
if(player->cinf)
{
char cinf_ascii[96];
for(int j = 0; j < 96; j++)
cinf_ascii[j] = *(unsigned short *)&cinf_ptr[2 * j];
if(strncmp(cinf_ascii, player->cinf, 96) != 0)
errorf(ZEN_FW_MISMATCH, "Fail!\n[ERR] Player mismatch: CINF indicates '%s' instead of '%s'\n",
cinf_ascii, player->cinf);
else
printf("Done!\n");
}
else
printf("Bypass!\n");
/** decrypt firmware */
printf("[INFO] Decrypting encoded block... ");
uint32_t iv[2];
iv[0] = 0;
iv[1] = swap(le2int(&out_buffer[fw_off + 4]));
if(!bf_cbc_decrypt((unsigned char*)player->tl_key, strlen(player->tl_key) + 1,
&out_buffer[fw_off + 8], le2int(&out_buffer[fw_off + 4]), (const unsigned char*)&iv))
errorf(ZEN_ERROR, "Fail!\n[ERR] Couldn't decrypt encoded block\n");
printf("Done!\n");
/** sanity checks on firmware */
uint32_t jrm_size = le2int(&out_buffer[fw_off + 8]);
if(jrm_size > le2int(&out_buffer[fw_off + 4]) * 3)
errorf(ZEN_FW_INVALID, "[ERR] Decrypted length of encoded block is unexpectedly large: 0x%08x\n", jrm_size);
printf("[INFO] Firmware size: %d\n", jrm_size);
uint8_t *jrm = malloc(jrm_size);
if(jrm == NULL)
errorf(ZEN_ERROR, "[ERR] Couldn't allocate memory\n");
memset(buffer, 0, jrm_size);
/** decompress firmware */
printf("[INFO] Decompressing encoded block... ");
if(!cenc_decode(&out_buffer[fw_off + 12], le2int(&out_buffer[fw_off + 4]) - 4, jrm, jrm_size))
errorf(ZEN_ERROR, "Fail!\n[ERR] Couldn't decompress the encoded block\n");
printf("Done!\n");
/** Copy OF because patching might modify it */
void *jrm_save = malloc(jrm_size);
uint32_t jrm_save_size = jrm_size;
if(jrm_save == NULL)
errorf(ZEN_ERROR, "[ERR] Couldn't allocate memory");
memcpy(jrm_save, jrm, jrm_size);
/** Patch firmware */
err = patch_firmware(&jrm, &jrm_size, boot, boot_size, opt);
if(err != ZEN_SUCCESS)
errorf(err, "[ERR] Couldn't patch firmware\n");
/** Rebuild archive */
bool keep_old_bits = opt.output == ZEN_DUALBOOT || opt.output == ZEN_MIXEDBOOT;
bool keep_of = opt.output == ZEN_MIXEDBOOT;
/* if we keep old stuff, keep everything up to LT block, otherwise just CIFF header */
uint32_t off = keep_old_bits ? fw_off : 8;
/* move the rest of the archive if keeping old stuff */
if(keep_old_bits)
{
uint32_t copy_off = fw_off + 8 + le2int(&out_buffer[fw_off + 4]);
uint32_t copy_size = ciff_size - fw_off - 8 - le2int(&out_buffer[fw_off + 4]) - 28;
memmove(&out_buffer[off], &out_buffer[copy_off], copy_size);
off += copy_size;
}
/* if we keep the OF, put a copy of it after renaming it to Hcreativeos.jrm */
if(keep_of)
{
out_buffer = realloc(out_buffer, off + jrm_save_size + 40);
if(out_buffer == NULL)
errorf(ZEN_ERROR, "[ERR] Couldn't resize memory block\n");
printf("[INFO] Renaming encoded block to Hcreativeos.jrm... ");
memcpy(&out_buffer[off], "ATAD", 4);
int2le(jrm_save_size + 32, &out_buffer[off + 4]);
memset(&out_buffer[off + 8], 0, 32);
memcpy(&out_buffer[off + 8], "H\0c\0r\0e\0a\0t\0i\0v\0e\0o\0s\0.\0j\0r\0m", 30);
memcpy(&out_buffer[off + 40], jrm_save, jrm_save_size);
off += jrm_save_size + 40;
printf("Done!\n");
}
/* put modified firmware */
out_buffer = realloc(out_buffer, off + jrm_size + 40);
if(out_buffer == NULL)
errorf(ZEN_ERROR, "[ERR] Couldn't resize memory block\n");
printf("[INFO] Adding Hjukebox2.jrm... ");
memcpy(&out_buffer[off], "ATAD", 4);
int2le(jrm_size + 32, &out_buffer[off + 4]);
memset(&out_buffer[off + 8], 0, 32);
memcpy(&out_buffer[off + 8], "H\0j\0u\0k\0e\0b\0o\0x\0""2\0.\0j\0r\0m", 26);
memcpy(&out_buffer[off + 40], jrm, jrm_size);
off += jrm_size + 40;
printf("Done!\n");
/** fix header */
int2le(off - 8, &out_buffer[4]);
/** update checksum */
printf("[INFO] Updating checksum... ");
out_buffer = realloc(out_buffer, off + 28);
if(out_buffer == NULL)
errorf(ZEN_ERROR, "[ERR] Couldn't resize memory block\n");
memcpy(&out_buffer[off], "LLUN", 4);
int2le(20, &out_buffer[off + 4]);
hmac_sha1((unsigned char*)player->null_key, strlen(player->null_key), out_buffer,
off, &out_buffer[off + 8]);
off += 28;
printf("Done!\n");
err = write_file(outfile, out_buffer, off);
free(jrm);
free(jrm_save);
free(out_buffer);
return err;
}
/* find an entry into zen_sums which matches the MD5 sum of a file */
static enum zen_error_t find_model_by_md5sum(uint8_t file_md5sum[16], int *md5_idx)
{
int i = 0;
while(i < NR_ZEN_SUMS)
{
uint8_t md5[20];
if(strlen(zen_sums[i].md5sum) != 32)
errorf(ZEN_ERROR, "[ERR][INTERNAL] Invalid MD5 sum in zen_sums\n");
for(int j = 0; j < 16; j++)
{
uint8_t a, b;
if(convxdigit(zen_sums[i].md5sum[2 * j], &a) || convxdigit(zen_sums[i].md5sum[2 * j + 1], &b))
errorf(ZEN_ERROR, "[ERR][INTERNAL] Bad checksum format: %s\n", zen_sums[i].md5sum);
md5[j] = (a << 4) | b;
}
if(memcmp(file_md5sum, md5, 16) == 0)
break;
i++;
}
if(i == NR_ZEN_SUMS)
errorf(ZEN_NO_MATCH, "[ERR] MD5 sum doesn't match any known file\n");
*md5_idx = i;
return ZEN_SUCCESS;
}
enum zen_error_t mkzenboot(const char *infile, const char *bootfile,
const char *outfile, struct zen_option_t opt)
{
/* determine firmware model */
void *fw;
size_t fw_size;
enum zen_error_t err = read_file(infile, &fw, &fw_size);
uint8_t file_md5sum[16];
err = compute_md5sum_buf(fw, fw_size, file_md5sum);
if(err != ZEN_SUCCESS)
{
free(fw);
return err;
}
printf("[INFO] MD5 sum of the file: ");
for(int i = 0; i < 16; i++)
printf("%02X ", file_md5sum[i]);
printf("\n");
if(opt.model == MODEL_UNKNOWN)
{
int idx;
err = find_model_by_md5sum(file_md5sum, &idx);
if(err != ZEN_SUCCESS)
{
free(fw);
errorf(err, "[ERR] Cannot determine model type\n");
}
opt.model = zen_sums[idx].model;
printf("[INFO] MD5 matches %s, version %s\n",
zen_models[opt.model].model_name, zen_sums[idx].version);
}
printf("[INFO] Model is: %s\n", zen_models[opt.model].model_name);
/* load rockbox file */
uint8_t *boot;
size_t boot_size;
err = read_file(bootfile, (void **)&boot, &boot_size);
if(err != ZEN_SUCCESS)
{
free(fw);
errorf(err, "[ERR] Cannot read boot file\n");
}
/* validate checksum */
if(memcmp(boot + 4, zen_models[opt.model].rb_model_name, 4) != 0)
{
free(fw);
free(boot);
errorf(ZEN_BOOT_MISMATCH, "[ERR] Boot model mismatch\n");
}
printf("[INFO] Bootloader file matches model\n");
uint32_t sum = zen_models[opt.model].rb_model_num;
for(int i = 8; i < boot_size; i++)
sum += boot[i];
if(sum != be2int(boot))
{
free(fw);
free(boot);
errorf(ZEN_BOOT_CHECKSUM_ERROR, "[ERR] Checksum mismatch\n");
}
printf("[INFO] Bootloader file checksum is correct\n");
/* produce file */
err = build_firmware(fw, fw_size, boot + 8, boot_size - 8, outfile, opt);
free(boot);
free(fw);
return err;
}
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