/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * * Copyright (C) 2008 by Maurus Cuelenaere * Based on zenutils by Rasmus Ry * 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 #include #include #include #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 1.21.03 */ MODEL_ZEN, "08ea23a65d89a8d352753ee22f8d6a61", "1.21.03" }, { /* 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 : * 40: eafffffe b 40 */ *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; }