Introduce samsungtools to decrypt samsung firmware
Samsung provides many firmware upgrade in the format of a .dat file, at least for nearly all YP's (checked for Q2, R0, T10, Z5). This is a simple cyclic xor which a fixed key, a md5 sum and a header specifying the model/version/region. Change-Id: Ib0461a74196383189fd2d8162da444a85a229c60
This commit is contained in:
Amaury Pouly
parent
ee36a396cd
commit
d66c16749a
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@ -0,0 +1,17 @@
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DEFINES=
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CC=gcc
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LD=gcc
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CFLAGS=-g -std=c99 -W -Wall $(DEFINES) `pkg-config --cflags openssl`
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LDFLAGS=`pkg-config --libs openssl`
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BINS=fwdecrypt
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all: $(BINS)
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%.o: %.c
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$(CC) $(CFLAGS) -c -o $@ $<
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fwdecrypt: fwdecrypt.o samsung.o
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$(LD) -o $@ $^ $(LDFLAGS)
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clean:
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rm -fr *.o $(BINS)
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2012 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "samsung.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <getopt.h>
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static bool g_debug = false;
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static char *g_out_prefix = NULL;
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static void usage(void)
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{
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printf("Usage: fwdecrypt [options] firmware\n");
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printf("Options:\n");
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printf(" -o <prefix>\tSet output file\n");
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printf(" -f/--force\tForce to continue on errors\n");
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printf(" -?/--help\tDisplay this message\n");
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printf(" -d/--debug\tDisplay debug messages\n");
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exit(1);
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}
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static int s_read(void *user, int offset, void *buf, int size)
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{
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FILE *f = user;
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if(fseek(f, offset, SEEK_SET) != 0)
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return 0;
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return fread(buf, 1, size, f);
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}
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static void s_printf(void *user, bool error, const char *fmt, ...)
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{
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if(!g_debug && !error)
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return;
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(void) user;
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va_list args;
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va_start(args, fmt);
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vprintf(fmt, args);
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va_end(args);
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}
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int main(int argc, char **argv)
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{
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if(argc <= 1)
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usage();
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while(1)
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{
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static struct option long_options[] =
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{
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{"help", no_argument, 0, '?'},
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{"debug", no_argument, 0, 'd'},
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{0, 0, 0, 0}
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};
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int c = getopt_long(argc, argv, "?do:", long_options, NULL);
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if(c == -1)
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break;
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switch(c)
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{
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case -1:
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break;
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case 'd':
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g_debug = true;
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break;
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case '?':
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usage();
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break;
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case 'o':
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g_out_prefix = optarg;
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break;
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default:
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abort();
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}
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}
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if(optind != argc - 1)
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usage();
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FILE *f = fopen(argv[optind], "rb");
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if(f == NULL)
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{
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printf("Cannot open file for reading: %m\n");
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return 1;
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}
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enum samsung_error_t err;
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struct samsung_firmware_t *fw = samsung_read(s_read, s_printf,
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f, &err);
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if(fw == NULL || err != SAMSUNG_SUCCESS)
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{
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printf("Error reading firmware: %d\n", err);
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samsung_free(fw);
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return 1;
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}
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fclose(f);
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if(g_out_prefix)
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{
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f = fopen(g_out_prefix, "wb");
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if(f == NULL)
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{
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printf("Cannot open file for writing: %m\n");
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return 2;
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}
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fwrite(fw->data, 1, fw->data_size, f);
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fclose(f);
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}
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samsung_free(fw);
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return 0;
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}
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@ -0,0 +1,127 @@
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2012 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "samsung.h"
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#include <openssl/md5.h>
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#include <string.h>
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#include <stdlib.h>
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#ifndef MIN
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#define MIN(a,b) ((a) < (b) ? (a) : (b))
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#endif
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static uint8_t g_yp_key[128] =
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{
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0xa3, 0x04, 0xb9, 0xcd, 0x34, 0x13, 0x4a, 0x19, 0x19, 0x35, 0xdf, 0xbb, 0x8f, 0x3d, 0x7f, 0x09,
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0x42, 0x3c, 0x96, 0xc6, 0x41, 0xa9, 0x95, 0xf1, 0xd0, 0xac, 0x16, 0x37, 0x57, 0x1f, 0x28, 0xe7,
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0x0b, 0xc2, 0x12, 0x09, 0x39, 0x42, 0xd2, 0x96, 0xf5, 0x00, 0xd2, 0x23, 0xa4, 0x24, 0xe2, 0x8e,
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0x50, 0x3c, 0x6e, 0x23, 0xeb, 0x68, 0xed, 0x31, 0xb7, 0xee, 0xc0, 0xc7, 0x09, 0xf8, 0x0e, 0x9d,
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0x51, 0xed, 0x17, 0x95, 0x64, 0x09, 0xe0, 0xf9, 0xf0, 0xef, 0x86, 0xc0, 0x04, 0x46, 0x89, 0x8a,
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0x6e, 0x27, 0x69, 0xde, 0xc7, 0x9d, 0x1e, 0xee, 0x3c, 0x3f, 0x17, 0x05, 0x44, 0xbb, 0xbb, 0x1d,
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0x3d, 0x5d, 0x6e, 0xf2, 0xcf, 0x15, 0xd6, 0x3c, 0xcc, 0x7d, 0x67, 0x1a, 0xb8, 0xd2, 0x1b, 0x54,
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0x97, 0xa2, 0x58, 0x58, 0xf7, 0x4e, 0x5e, 0x50, 0x42, 0x69, 0xdc, 0xe7, 0x3a, 0x87, 0x2e, 0x22
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};
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static void cyclic_xor(void *data, int datasize, void *xor, int xorsize)
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{
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for(int i = 0; i < datasize; i++)
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*(uint8_t *)(data + i) ^= *(uint8_t *)(xor + (i % xorsize));
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}
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struct samsung_firmware_t *samsung_read(samsung_read_t read,
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samsung_printf_t printf, void *user, enum samsung_error_t *err)
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{
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struct yp_header_t yp_hdr;
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struct yp_md5_t yp_md5;
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/* read and check header */
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if(read(user, 0, &yp_hdr, sizeof(yp_hdr)) != sizeof(yp_hdr))
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{
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printf(user, true, "Cannot read YP header\n");
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*err = SAMSUNG_READ_ERROR;
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return NULL;
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}
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if(strncmp(yp_hdr.signature, YP_SIGNATURE, sizeof(yp_hdr.signature)) != 0)
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{
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printf(user, true, "Bad YP signature\n");
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*err = SAMSUNG_FORMAT_ERROR;
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return NULL;
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}
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printf(user, false, "Model: %s\n", yp_hdr.model);
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printf(user, false, "Version: %s %s %s\n", yp_hdr.version, yp_hdr.region, yp_hdr.extra);
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/* allocate and read data */
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struct samsung_firmware_t *fw = malloc(sizeof(struct samsung_firmware_t));
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memset(fw, 0, sizeof(struct samsung_firmware_t));
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fw->data_size = yp_hdr.datasize;
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fw->data = malloc(fw->data_size);
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strncpy(fw->version, yp_hdr.version, sizeof(yp_hdr.version));
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strncpy(fw->region, yp_hdr.region, sizeof(yp_hdr.region));
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strncpy(fw->extra, yp_hdr.extra, sizeof(yp_hdr.extra));
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strncpy(fw->model, yp_hdr.model, sizeof(yp_hdr.model));
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if(read(user, sizeof(yp_hdr), fw->data, fw->data_size) != fw->data_size)
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{
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printf(user, true, "Cannot read data\n");
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*err = SAMSUNG_READ_ERROR;
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samsung_free(fw);
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return NULL;
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}
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/* read and check MD5 */
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if(read(user, yp_hdr.datasize + sizeof(yp_hdr), &yp_md5, sizeof(yp_md5)) != sizeof(yp_md5))
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{
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printf(user, true, "Cannot read MD5 sum\n");
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*err = SAMSUNG_READ_ERROR;
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samsung_free(fw);
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return NULL;
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}
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uint8_t actual_md5[MD5_DIGEST_LENGTH];
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MD5_CTX c;
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MD5_Init(&c);
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MD5_Update(&c, fw->data, fw->data_size);
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MD5_Final(actual_md5, &c);
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if(memcmp(actual_md5, yp_md5.md5, MD5_DIGEST_LENGTH) != 0)
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{
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printf(user, true, "MD5 mismatch\n");
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*err = SAMSUNG_MD5_ERROR;
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samsung_free(fw);
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return NULL;
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}
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/* decrypt */
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cyclic_xor(fw->data, fw->data_size, g_yp_key, sizeof(g_yp_key));
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/* success ! */
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*err = SAMSUNG_SUCCESS;
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return fw;
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}
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void samsung_free(struct samsung_firmware_t *fw)
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{
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if(fw)
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{
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free(fw->data);
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free(fw);
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}
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}
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2012 Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __SAMSUNG_H__
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#define __SAMSUNG_H__
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#include <stdint.h>
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#include <stdbool.h>
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/**
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* Low-Level
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*/
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struct yp_header_t
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{
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char signature[12];
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uint32_t pad;
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char version[8];
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char region[4];
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char extra[4];
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char model[20];
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uint32_t datasize;
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} __attribute__((packed));
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struct yp_md5_t
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{
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uint8_t md5[16];
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} __attribute__((packed));
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#define YP_SIGNATURE "SAMSUNG YEPP"
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/**
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* API
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*/
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struct samsung_firmware_t
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{
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char version[8];
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char region[4];
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char extra[4];
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char model[20];
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void *data;
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int data_size;
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};
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enum samsung_error_t
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{
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SAMSUNG_SUCCESS = 0,
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SAMSUNG_READ_ERROR = -1,
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SAMSUNG_FORMAT_ERROR = -2,
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SAMSUNG_MD5_ERROR = -3,
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};
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typedef int (*samsung_read_t)(void *user, int offset, void *buffer, int size);
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typedef void (*samsung_printf_t)(void *user, bool error, const char *fmt, ...);
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struct samsung_firmware_t *samsung_read(samsung_read_t read,
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samsung_printf_t printf, void *user, enum samsung_error_t *err);
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void samsung_free(struct samsung_firmware_t *fw);
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#endif /* __SAMSUNG_H__ */
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