7fa48faeb5
The implementation of write_bootdata() and get_redirect_dir() was copied verbatim in two different places, obviously a bad thing for maintainability. This moves them to a new file multiboot.c as they are only used for multiboot. Change-Id: Id0279216e4dd019f8bf612a81d3835eff010e506
289 lines
9.5 KiB
C
289 lines
9.5 KiB
C
/***************************************************************************
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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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*
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* Copyright (C) 2006 by Barry Wardell
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* Copyright (C) 2020 by William Wilgus [MULTIBOOT]
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*
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* Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
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* and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
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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 <stdbool.h>
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#include <stdio.h>
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#include "config.h"
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#include "mi4-loader.h"
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#include "loader_strerror.h"
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#include "crc32.h"
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#include "file.h"
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#if defined(HAVE_BOOTDATA)
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#include "multiboot.h"
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#endif /* HAVE_BOOTDATA */
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static inline unsigned int le2int(unsigned char* buf)
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{
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int32_t res = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
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return res;
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}
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static inline void int2le(unsigned int val, unsigned char* addr)
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{
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addr[0] = val & 0xFF;
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addr[1] = (val >> 8) & 0xff;
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addr[2] = (val >> 16) & 0xff;
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addr[3] = (val >> 24) & 0xff;
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}
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static struct tea_key tea_keytable[] = {
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{ "default" , { 0x20d36cc0, 0x10e8c07d, 0xc0e7dcaa, 0x107eb080 } },
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{ "sansa", { 0xe494e96e, 0x3ee32966, 0x6f48512b, 0xa93fbb42 } },
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{ "sansa_gh", { 0xd7b10538, 0xc662945b, 0x1b3fce68, 0xf389c0e6 } },
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{ "sansa_103", { 0x1d29ddc0, 0x2579c2cd, 0xce339e1a, 0x75465dfe } },
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{ "rhapsody", { 0x7aa9c8dc, 0xbed0a82a, 0x16204cc7, 0x5904ef38 } },
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{ "p610", { 0x950e83dc, 0xec4907f9, 0x023734b9, 0x10cfb7c7 } },
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{ "p640", { 0x220c5f23, 0xd04df68e, 0x431b5e25, 0x4dcc1fa1 } },
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{ "virgin", { 0xe83c29a1, 0x04862973, 0xa9b3f0d4, 0x38be2a9c } },
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{ "20gc_eng", { 0x0240772c, 0x6f3329b5, 0x3ec9a6c5, 0xb0c9e493 } },
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{ "20gc_fre", { 0xbede8817, 0xb23bfe4f, 0x80aa682d, 0xd13f598c } },
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{ "elio_p722", { 0x6af3b9f8, 0x777483f5, 0xae8181cc, 0xfa6d8a84 } },
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{ "c200", { 0xbf2d06fa, 0xf0e23d59, 0x29738132, 0xe2d04ca7 } },
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{ "c200_103", { 0x2a7968de, 0x15127979, 0x142e60a7, 0xe49c1893 } },
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{ "c200_106", { 0xa913d139, 0xf842f398, 0x3e03f1a6, 0x060ee012 } },
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{ "view", { 0x70e19bda, 0x0c69ea7d, 0x2b8b1ad1, 0xe9767ced } },
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{ "sa9200", { 0x33ea0236, 0x9247bdc5, 0xdfaedf9f, 0xd67c9d30 } },
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{ "hdd1630/hdd63x0", { 0x04543ced, 0xcebfdbad, 0xf7477872, 0x0d12342e } },
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{ "vibe500", { 0xe3a66156, 0x77c6b67a, 0xe821dca5, 0xca8ca37c } },
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};
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/*
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tea_decrypt() from http://en.wikipedia.org/wiki/Tiny_Encryption_Algorithm
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"Following is an adaptation of the reference encryption and decryption
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routines in C, released into the public domain by David Wheeler and
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Roger Needham:"
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*/
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/* NOTE: The mi4 version of TEA uses a different initial value to sum compared
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to the reference implementation and the main loop is 8 iterations, not
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32.
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*/
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static void tea_decrypt(uint32_t* v0, uint32_t* v1, uint32_t* k) {
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uint32_t sum=0xF1BBCDC8, i; /* set up */
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uint32_t delta=0x9E3779B9; /* a key schedule constant */
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uint32_t k0=k[0], k1=k[1], k2=k[2], k3=k[3]; /* cache key */
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for(i=0; i<8; i++) { /* basic cycle start */
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*v1 -= ((*v0<<4) + k2) ^ (*v0 + sum) ^ ((*v0>>5) + k3);
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*v0 -= ((*v1<<4) + k0) ^ (*v1 + sum) ^ ((*v1>>5) + k1);
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sum -= delta; /* end cycle */
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}
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}
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/* mi4 files are encrypted in 64-bit blocks (two little-endian 32-bit
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integers) and the key is incremented after each block
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*/
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static void tea_decrypt_buf(unsigned char* src,
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unsigned char* dest,
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size_t n, uint32_t * key)
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{
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uint32_t v0, v1;
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unsigned int i;
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for (i = 0; i < (n / 8); i++) {
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v0 = le2int(src);
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v1 = le2int(src+4);
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tea_decrypt(&v0, &v1, key);
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int2le(v0, dest);
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int2le(v1, dest+4);
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src += 8;
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dest += 8;
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/* Now increment the key */
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key[0]++;
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if (key[0]==0) {
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key[1]++;
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if (key[1]==0) {
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key[2]++;
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if (key[2]==0) {
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key[3]++;
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}
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}
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}
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}
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}
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static int tea_find_key(struct mi4header_t *mi4header, unsigned char* buf)
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{
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unsigned int i;
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uint32_t key[4];
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uint32_t keyinc;
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unsigned char magic_dec[8];
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int key_found = -1;
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unsigned int magic_location = mi4header->length-4;
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int unaligned = 0;
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if ( (magic_location % 8) != 0 )
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{
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unaligned = 1;
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magic_location -= 4;
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}
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for (i=0; i < NUM_KEYS && (key_found<0) ; i++) {
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key[0] = tea_keytable[i].key[0];
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key[1] = tea_keytable[i].key[1];
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key[2] = tea_keytable[i].key[2];
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key[3] = tea_keytable[i].key[3];
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/* Now increment the key */
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keyinc = (magic_location-mi4header->plaintext)/8;
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if ((key[0]+keyinc) < key[0]) key[1]++;
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key[0] += keyinc;
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if (key[1]==0) key[2]++;
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if (key[2]==0) key[3]++;
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/* Decrypt putative magic */
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tea_decrypt_buf(&buf[magic_location], magic_dec, 8, key);
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if (le2int(&magic_dec[4*unaligned]) == 0xaa55aa55)
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{
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key_found = i;
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}
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}
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return key_found;
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}
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/* Load mi4 format firmware image from a FULLY QUALIFIED PATH */
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static int load_mi4_filename(unsigned char* buf,
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const char* filename,
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unsigned int buffer_size)
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{
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int fd;
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struct mi4header_t mi4header;
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int rc;
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unsigned long sum;
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fd = open(filename, O_RDONLY);
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if(fd < 0)
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return EFILE_NOT_FOUND;
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read(fd, &mi4header, MI4_HEADER_SIZE);
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/* MI4 file size */
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if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
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{
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close(fd);
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return EFILE_TOO_BIG;
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}
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/* Load firmware file */
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lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
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rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
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close(fd);
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if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
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return EREAD_IMAGE_FAILED;
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/* Check CRC32 to see if we have a valid file */
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sum = crc_32r (buf, mi4header.mi4size - MI4_HEADER_SIZE, 0);
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if(sum != mi4header.crc32)
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return EBAD_CHKSUM;
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if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
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{
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/* Load encrypted firmware */
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int key_index = tea_find_key(&mi4header, buf);
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if (key_index < 0)
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return EINVALID_FORMAT;
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/* Plaintext part is already loaded */
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buf += mi4header.plaintext;
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/* Decrypt in-place */
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tea_decrypt_buf(buf, buf,
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mi4header.mi4size-(mi4header.plaintext+MI4_HEADER_SIZE),
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tea_keytable[key_index].key);
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/* Check decryption was successfull */
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if(le2int(&buf[mi4header.length-mi4header.plaintext-4]) != 0xaa55aa55)
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return EREAD_IMAGE_FAILED;
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}
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return mi4header.mi4size - MI4_HEADER_SIZE;
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}
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/* Load mi4 format firmware image */
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int load_mi4(unsigned char* buf, const char* firmware, unsigned int buffer_size)
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{
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int ret = EFILE_NOT_FOUND;
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char filename[MAX_PATH+2];
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/* only filename passed */
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if (firmware[0] != '/')
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{
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#ifdef HAVE_MULTIBOOT /* defined by config.h */
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/* checks <volumes> highest index to lowest for redirect file
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* 0 is the default boot volume, it is not checked here
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* if found <volume>/rockbox_main.<playername> and firmware
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* has a bootdata region this firmware will be loaded */
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for (unsigned int i = NUM_VOLUMES - 1; i > 0 && ret < 0; i--)
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{
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if (get_redirect_dir(filename, sizeof(filename), i,
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BOOTDIR, firmware) > 0)
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{
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ret = load_mi4_filename(buf, filename, buffer_size);
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/* if firmware has no boot_data don't load from external drive */
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if (write_bootdata(buf, ret, i) <= 0)
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ret = EKEY_NOT_FOUND;
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}
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/* if ret is valid breaks from loop to continue loading */
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}
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#endif
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if (ret < 0) /* Check default volume, no valid firmware file loaded yet */
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{
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/* First check in BOOTDIR */
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snprintf(filename, sizeof(filename), BOOTDIR "/%s",firmware);
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ret = load_mi4_filename(buf, filename, buffer_size);
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if (ret < 0)
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{
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/* Check in root dir */
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snprintf(filename, sizeof(filename),"/%s",firmware);
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ret = load_mi4_filename(buf, filename, buffer_size);
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}
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#ifdef HAVE_BOOTDATA
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/* 0 is the default boot volume */
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write_bootdata(buf, ret, 0);
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#endif
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}
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}
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else /* full path passed ROLO etc.*/
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ret = load_mi4_filename(buf, firmware, buffer_size);
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return ret;
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}
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