CfgUSBLoader/cios/sdhc/libwbfs/wiidisc.c

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// Copyright 2009 Kwiirk based on negentig.c:
// Copyright 2007,2008 Segher Boessenkool <segher@kernel.crashing.org>
// Licensed under the terms of the GNU GPL, version 2
// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
#include "wiidisc.h"
void aes_set_key(u8 *key);
void aes_decrypt(u8 *iv, u8 *inbuf, u8 *outbuf, unsigned long long len);
static void _decrypt_title_key(u8 *tik, u8 *title_key)
{
u8 common_key[16]={
0xeb, 0xe4, 0x2a, 0x22, 0x5e, 0x85, 0x93, 0xe4, 0x48, 0xd9, 0xc5, 0x45,
0x73, 0x81, 0xaa, 0xf7
};;
u8 iv[16];
wbfs_memset(iv, 0, sizeof iv);
wbfs_memcpy(iv, tik + 0x01dc, 8);
aes_set_key(common_key);
//_aes_cbc_dec(common_key, iv, tik + 0x01bf, 16, title_key);
aes_decrypt(iv, tik + 0x01bf,title_key,16);
}
static u32 _be32(const u8 *p)
{
return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
}
static void disc_read(wiidisc_t *d,u32 offset, u8 *data, u32 len)
{
if(data){
int ret=0;
if(len==0)
return ;
ret = d->read(d->fp,offset,len,data);
if(ret)
wbfs_fatal("error reading disc");
}
if(d->sector_usage_table)
{
u32 blockno = offset>>13;
do
{
d->sector_usage_table[blockno]=1;
blockno+=1;
if(len>0x8000)
len-=0x8000;
}while(len>0x8000);
}
}
static void partition_raw_read(wiidisc_t *d,u32 offset, u8 *data, u32 len)
{
disc_read(d, d->partition_raw_offset + offset, data, len);
}
static void partition_read_block(wiidisc_t *d,u32 blockno, u8 *block)
{
u8*raw = d->tmp_buffer;
u8 iv[16];
u32 offset;
if(d->sector_usage_table)
d->sector_usage_table[d->partition_block+blockno]=1;
offset = d->partition_data_offset + ((0x8000>>2) * blockno);
partition_raw_read(d,offset, raw, 0x8000);
// decrypt data
memcpy(iv, raw + 0x3d0, 16);
aes_set_key(d->disc_key);
aes_decrypt(iv, raw + 0x400,block,0x7c00);
}
static void partition_read(wiidisc_t *d,u32 offset, u8 *data, u32 len,int fake)
{
u8 *block = d->tmp_buffer2;
u32 offset_in_block;
u32 len_in_block;
if(fake && d->sector_usage_table==0)
return;
while(len) {
offset_in_block = offset % (0x7c00>>2);
len_in_block = 0x7c00 - (offset_in_block<<2);
if (len_in_block > len)
len_in_block = len;
if(!fake){
partition_read_block(d,offset / (0x7c00>>2), block);
wbfs_memcpy(data, block + (offset_in_block<<2), len_in_block);
}else
d->sector_usage_table[d->partition_block+(offset/(0x7c00>>2))]=1;
data += len_in_block;
offset += len_in_block>>2;
len -= len_in_block;
}
}
static u32 do_fst(wiidisc_t *d,u8 *fst, const char *names, u32 i)
{
u32 offset;
u32 size;
const char *name;
u32 j;
name = names + (_be32(fst + 12*i) & 0x00ffffff);
size = _be32(fst + 12*i + 8);
if (i == 0) {
for (j = 1; j < size && !d->extracted_buffer; ){
j = do_fst(d,fst, names, j);
}
return size;
}
//printf("name %s\n",name);
if (fst[12*i]) {
for (j = i + 1; j < size && !d->extracted_buffer; )
j = do_fst(d,fst, names, j);
return size;
} else {
offset = _be32(fst + 12*i + 4);
if(d->extract_pathname && strcmp(name, d->extract_pathname)==0)
{
d->extracted_buffer = wbfs_ioalloc(size);
partition_read(d,offset, d->extracted_buffer, size,0);
}else
partition_read(d,offset, 0, size,1);
return i + 1;
}
}
static void do_files(wiidisc_t*d)
{
u8 *b = wbfs_ioalloc(0x480); // XXX: determine actual header size
u32 dol_offset;
u32 fst_offset;
u32 fst_size;
u32 apl_offset;
u32 apl_size;
u8 *apl_header = wbfs_ioalloc(0x20);
u8 *fst;
u32 n_files;
partition_read(d,0, b, 0x480,0);
dol_offset = _be32(b + 0x0420);
fst_offset = _be32(b + 0x0424);
fst_size = _be32(b + 0x0428)<<2;
apl_offset = 0x2440>>2;
partition_read(d,apl_offset, apl_header, 0x20,0);
apl_size = 0x20 + _be32(apl_header + 0x14) + _be32(apl_header + 0x18);
// fake read dol and partition
partition_read(d,apl_offset, 0, apl_size,1);
partition_read(d,dol_offset, 0, (fst_offset - dol_offset)<<2,1);
fst = wbfs_ioalloc(fst_size);
if (fst == 0)
wbfs_fatal("malloc fst");
partition_read(d,fst_offset, fst, fst_size,0);
n_files = _be32(fst + 8);
if (n_files > 1)
do_fst(d,fst, (char *)fst + 12*n_files, 0);
wbfs_iofree(b);
wbfs_iofree(apl_header);
wbfs_iofree(fst);
}
static void do_partition(wiidisc_t*d)
{
u8 *tik = wbfs_ioalloc(0x2a4);
u8 *b = wbfs_ioalloc(0x1c);
u64 tmd_offset;
u32 tmd_size;
u8 *tmd;
u64 cert_offset;
u32 cert_size;
u8 *cert;
u64 h3_offset;
// read ticket, and read some offsets and sizes
partition_raw_read(d,0, tik, 0x2a4);
partition_raw_read(d,0x2a4>>2, b, 0x1c);
tmd_size = _be32(b);
tmd_offset = _be32(b + 4);
cert_size = _be32(b + 8);
cert_offset = _be32(b + 0x0c);
h3_offset = _be32(b + 0x10);
d->partition_data_offset = _be32(b + 0x14);
d->partition_block = (d->partition_raw_offset+d->partition_data_offset)>>13;
tmd = wbfs_ioalloc(tmd_size);
if (tmd == 0)
wbfs_fatal("malloc tmd");
partition_raw_read(d,tmd_offset, tmd, tmd_size);
cert = wbfs_ioalloc(cert_size);
if (cert == 0)
wbfs_fatal("malloc cert");
partition_raw_read(d,cert_offset, cert, cert_size);
_decrypt_title_key(tik, d->disc_key);
partition_raw_read(d,h3_offset, 0, 0x18000);
wbfs_iofree(b);
wbfs_iofree(tik);
wbfs_iofree(cert);
wbfs_iofree(tmd);
do_files(d);
}
static int test_parition_skip(u32 partition_type,partition_selector_t part_sel)
{
switch(part_sel)
{
case ALL_PARTITIONS:
return 0;
case REMOVE_UPDATE_PARTITION:
return (partition_type==1);
case ONLY_GAME_PARTITION:
return (partition_type!=0);
default:
return (partition_type!=part_sel);
}
}
static void do_disc(wiidisc_t*d)
{
u8 *b = wbfs_ioalloc(0x100);
u64 partition_offset[32]; // XXX: don't know the real maximum
u64 partition_type[32]; // XXX: don't know the real maximum
u32 n_partitions;
u32 magic;
u32 i;
disc_read(d,0, b, 0x100);
magic=_be32(b+24);
if(magic!=0x5D1C9EA3){
wbfs_error("not a wii disc");
return ;
}
disc_read(d,0x40000>>2, b, 0x100);
n_partitions = _be32(b);
disc_read(d,_be32(b + 4), b, 0x100);
for (i = 0; i < n_partitions; i++){
partition_offset[i] = _be32(b + 8 * i);
partition_type[i] = _be32(b + 8 * i+4);
}
for (i = 0; i < n_partitions; i++) {
d->partition_raw_offset = partition_offset[i];
if(!test_parition_skip(partition_type[i],d->part_sel))
do_partition(d);
}
wbfs_iofree(b);
}
wiidisc_t *wd_open_disc(read_wiidisc_callback_t read,void*fp)
{
wiidisc_t *d = wbfs_malloc(sizeof(wiidisc_t));
if(!d)
return 0;
wbfs_memset(d,0,sizeof(wiidisc_t));
d->read = read;
d->fp = fp;
d->part_sel = ALL_PARTITIONS;
d->tmp_buffer = wbfs_ioalloc(0x8000);
d->tmp_buffer2 = wbfs_malloc(0x8000);
return d;
}
void wd_close_disc(wiidisc_t *d)
{
wbfs_iofree(d->tmp_buffer);
wbfs_free(d->tmp_buffer2);
wbfs_free(d);
}
// returns a buffer allocated with wbfs_ioalloc() or NULL if not found of alloc error
// XXX pathname not implemented. files are extracted by their name.
// first file found with that name is returned.
u8 * wd_extract_file(wiidisc_t *d, partition_selector_t partition_type, char *pathname)
{
u8 *retval = 0;
d->extract_pathname = pathname;
d->extracted_buffer = 0;
d->part_sel = partition_type;
do_disc(d);
d->extract_pathname = 0;
d->part_sel = ALL_PARTITIONS;
retval = d->extracted_buffer;
d->extracted_buffer = 0;
return retval;
}
void wd_build_disc_usage(wiidisc_t *d, partition_selector_t selector, u8* usage_table)
{
d->sector_usage_table = usage_table;
wbfs_memset(usage_table,0,143432*2);
d->part_sel = selector;
do_disc(d);
d->part_sel = ALL_PARTITIONS;
d->sector_usage_table = 0;
}
void wd_fix_partition_table(wiidisc_t *d, partition_selector_t selector, u8* partition_table)
{
u8 *b = partition_table;
u32 partition_offset;
u32 partition_type;
u32 n_partitions,i,j;
u32 *b32;
if(selector == ALL_PARTITIONS)
return;
n_partitions = _be32(b);
if(_be32(b + 4)-(0x40000>>2) >0x50)
wbfs_fatal("cannot modify this partition table. Please report the bug.");
b += (_be32(b + 4)-(0x40000>>2))*4;
j=0;
for (i = 0; i < n_partitions; i++){
partition_offset = _be32(b + 8 * i);
partition_type = _be32(b + 8 * i+4);
if(!test_parition_skip(partition_type,selector))
{
b32 = (u32*)(b + 8 * j);
b32[0] = wbfs_htonl(partition_offset);
b32[1] = wbfs_htonl(partition_type);
j++;
}
}
b32 = (u32*)(partition_table);
*b32 = wbfs_htonl(j);
}