mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-11-05 02:55:07 +01:00
338 lines
9.4 KiB
C
338 lines
9.4 KiB
C
// Copyright 2009 Kwiirk based on negentig.c:
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// Copyright 2007,2008 Segher Boessenkool <segher@kernel.crashing.org>
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// Licensed under the terms of the GNU GPL, version 2
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// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
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#include "wiidisc.h"
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void aes_set_key(u8 *key);
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void aes_decrypt(u8 *iv, u8 *inbuf, u8 *outbuf, unsigned long long len);
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static void _decrypt_title_key(u8 *tik, u8 *title_key)
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{
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u8 common_key[16]={
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0xeb, 0xe4, 0x2a, 0x22, 0x5e, 0x85, 0x93, 0xe4, 0x48, 0xd9, 0xc5, 0x45,
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0x73, 0x81, 0xaa, 0xf7
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};;
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u8 iv[16];
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wbfs_memset(iv, 0, sizeof iv);
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wbfs_memcpy(iv, tik + 0x01dc, 8);
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aes_set_key(common_key);
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//_aes_cbc_dec(common_key, iv, tik + 0x01bf, 16, title_key);
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aes_decrypt(iv, tik + 0x01bf,title_key,16);
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}
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static u32 _be32(const u8 *p)
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{
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return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
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}
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static void disc_read(wiidisc_t *d,u32 offset, u8 *data, u32 len)
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{
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if(data){
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int ret=0;
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if(len==0)
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return ;
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ret = d->read(d->fp,offset,len,data);
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if(ret)
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wbfs_fatal("error reading disc");
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}
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if(d->sector_usage_table)
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{
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u32 blockno = offset>>13;
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do
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{
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d->sector_usage_table[blockno]=1;
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blockno+=1;
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if(len>0x8000)
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len-=0x8000;
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}while(len>0x8000);
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}
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}
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static void partition_raw_read(wiidisc_t *d,u32 offset, u8 *data, u32 len)
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{
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disc_read(d, d->partition_raw_offset + offset, data, len);
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}
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static void partition_read_block(wiidisc_t *d,u32 blockno, u8 *block)
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{
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u8*raw = d->tmp_buffer;
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u8 iv[16];
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u32 offset;
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if(d->sector_usage_table)
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d->sector_usage_table[d->partition_block+blockno]=1;
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offset = d->partition_data_offset + ((0x8000>>2) * blockno);
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partition_raw_read(d,offset, raw, 0x8000);
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// decrypt data
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memcpy(iv, raw + 0x3d0, 16);
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aes_set_key(d->disc_key);
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aes_decrypt(iv, raw + 0x400,block,0x7c00);
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}
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static void partition_read(wiidisc_t *d,u32 offset, u8 *data, u32 len,int fake)
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{
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u8 *block = d->tmp_buffer2;
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u32 offset_in_block;
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u32 len_in_block;
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if(fake && d->sector_usage_table==0)
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return;
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while(len) {
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offset_in_block = offset % (0x7c00>>2);
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len_in_block = 0x7c00 - (offset_in_block<<2);
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if (len_in_block > len)
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len_in_block = len;
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if(!fake){
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partition_read_block(d,offset / (0x7c00>>2), block);
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wbfs_memcpy(data, block + (offset_in_block<<2), len_in_block);
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}else
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d->sector_usage_table[d->partition_block+(offset/(0x7c00>>2))]=1;
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data += len_in_block;
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offset += len_in_block>>2;
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len -= len_in_block;
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}
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}
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static u32 do_fst(wiidisc_t *d,u8 *fst, const char *names, u32 i)
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{
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u32 offset;
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u32 size;
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const char *name;
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u32 j;
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name = names + (_be32(fst + 12*i) & 0x00ffffff);
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size = _be32(fst + 12*i + 8);
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if (i == 0) {
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for (j = 1; j < size && !d->extracted_buffer; ){
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j = do_fst(d,fst, names, j);
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}
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return size;
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}
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//printf("name %s\n",name);
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if (fst[12*i]) {
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for (j = i + 1; j < size && !d->extracted_buffer; )
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j = do_fst(d,fst, names, j);
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return size;
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} else {
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offset = _be32(fst + 12*i + 4);
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if(d->extract_pathname && strcmp(name, d->extract_pathname)==0)
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{
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d->extracted_buffer = wbfs_ioalloc(size);
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partition_read(d,offset, d->extracted_buffer, size,0);
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}else
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partition_read(d,offset, 0, size,1);
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return i + 1;
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}
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}
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static void do_files(wiidisc_t*d)
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{
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u8 *b = wbfs_ioalloc(0x480); // XXX: determine actual header size
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u32 dol_offset;
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u32 fst_offset;
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u32 fst_size;
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u32 apl_offset;
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u32 apl_size;
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u8 *apl_header = wbfs_ioalloc(0x20);
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u8 *fst;
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u32 n_files;
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partition_read(d,0, b, 0x480,0);
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dol_offset = _be32(b + 0x0420);
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fst_offset = _be32(b + 0x0424);
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fst_size = _be32(b + 0x0428)<<2;
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apl_offset = 0x2440>>2;
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partition_read(d,apl_offset, apl_header, 0x20,0);
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apl_size = 0x20 + _be32(apl_header + 0x14) + _be32(apl_header + 0x18);
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// fake read dol and partition
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partition_read(d,apl_offset, 0, apl_size,1);
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partition_read(d,dol_offset, 0, (fst_offset - dol_offset)<<2,1);
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fst = wbfs_ioalloc(fst_size);
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if (fst == 0)
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wbfs_fatal("malloc fst");
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partition_read(d,fst_offset, fst, fst_size,0);
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n_files = _be32(fst + 8);
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if (n_files > 1)
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do_fst(d,fst, (char *)fst + 12*n_files, 0);
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wbfs_iofree(b);
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wbfs_iofree(apl_header);
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wbfs_iofree(fst);
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}
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static void do_partition(wiidisc_t*d)
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{
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u8 *tik = wbfs_ioalloc(0x2a4);
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u8 *b = wbfs_ioalloc(0x1c);
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u64 tmd_offset;
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u32 tmd_size;
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u8 *tmd;
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u64 cert_offset;
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u32 cert_size;
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u8 *cert;
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u64 h3_offset;
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// read ticket, and read some offsets and sizes
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partition_raw_read(d,0, tik, 0x2a4);
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partition_raw_read(d,0x2a4>>2, b, 0x1c);
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tmd_size = _be32(b);
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tmd_offset = _be32(b + 4);
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cert_size = _be32(b + 8);
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cert_offset = _be32(b + 0x0c);
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h3_offset = _be32(b + 0x10);
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d->partition_data_offset = _be32(b + 0x14);
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d->partition_block = (d->partition_raw_offset+d->partition_data_offset)>>13;
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tmd = wbfs_ioalloc(tmd_size);
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if (tmd == 0)
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wbfs_fatal("malloc tmd");
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partition_raw_read(d,tmd_offset, tmd, tmd_size);
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cert = wbfs_ioalloc(cert_size);
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if (cert == 0)
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wbfs_fatal("malloc cert");
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partition_raw_read(d,cert_offset, cert, cert_size);
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_decrypt_title_key(tik, d->disc_key);
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partition_raw_read(d,h3_offset, 0, 0x18000);
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wbfs_iofree(b);
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wbfs_iofree(tik);
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wbfs_iofree(cert);
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wbfs_iofree(tmd);
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do_files(d);
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}
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static int test_parition_skip(u32 partition_type,partition_selector_t part_sel)
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{
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switch(part_sel)
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{
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case ALL_PARTITIONS:
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return 0;
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case REMOVE_UPDATE_PARTITION:
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return (partition_type==1);
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case ONLY_GAME_PARTITION:
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return (partition_type!=0);
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default:
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return (partition_type!=part_sel);
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}
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}
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static void do_disc(wiidisc_t*d)
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{
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u8 *b = wbfs_ioalloc(0x100);
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u64 partition_offset[32]; // XXX: don't know the real maximum
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u64 partition_type[32]; // XXX: don't know the real maximum
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u32 n_partitions;
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u32 magic;
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u32 i;
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disc_read(d,0, b, 0x100);
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magic=_be32(b+24);
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if(magic!=0x5D1C9EA3){
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wbfs_error("not a wii disc");
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return ;
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}
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disc_read(d,0x40000>>2, b, 0x100);
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n_partitions = _be32(b);
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disc_read(d,_be32(b + 4), b, 0x100);
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for (i = 0; i < n_partitions; i++){
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partition_offset[i] = _be32(b + 8 * i);
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partition_type[i] = _be32(b + 8 * i+4);
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}
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for (i = 0; i < n_partitions; i++) {
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d->partition_raw_offset = partition_offset[i];
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if(!test_parition_skip(partition_type[i],d->part_sel))
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do_partition(d);
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}
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wbfs_iofree(b);
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}
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wiidisc_t *wd_open_disc(read_wiidisc_callback_t read,void*fp)
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{
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wiidisc_t *d = wbfs_malloc(sizeof(wiidisc_t));
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if(!d)
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return 0;
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wbfs_memset(d,0,sizeof(wiidisc_t));
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d->read = read;
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d->fp = fp;
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d->part_sel = ALL_PARTITIONS;
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d->tmp_buffer = wbfs_ioalloc(0x8000);
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d->tmp_buffer2 = wbfs_malloc(0x8000);
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return d;
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}
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void wd_close_disc(wiidisc_t *d)
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{
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wbfs_iofree(d->tmp_buffer);
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wbfs_free(d->tmp_buffer2);
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wbfs_free(d);
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}
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// returns a buffer allocated with wbfs_ioalloc() or NULL if not found of alloc error
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// XXX pathname not implemented. files are extracted by their name.
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// first file found with that name is returned.
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u8 * wd_extract_file(wiidisc_t *d, partition_selector_t partition_type, char *pathname)
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{
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u8 *retval = 0;
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d->extract_pathname = pathname;
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d->extracted_buffer = 0;
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d->part_sel = partition_type;
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do_disc(d);
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d->extract_pathname = 0;
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d->part_sel = ALL_PARTITIONS;
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retval = d->extracted_buffer;
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d->extracted_buffer = 0;
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return retval;
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}
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void wd_build_disc_usage(wiidisc_t *d, partition_selector_t selector, u8* usage_table)
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{
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d->sector_usage_table = usage_table;
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wbfs_memset(usage_table,0,143432*2);
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d->part_sel = selector;
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do_disc(d);
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d->part_sel = ALL_PARTITIONS;
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d->sector_usage_table = 0;
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}
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void wd_fix_partition_table(wiidisc_t *d, partition_selector_t selector, u8* partition_table)
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{
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u8 *b = partition_table;
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u32 partition_offset;
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u32 partition_type;
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u32 n_partitions,i,j;
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u32 *b32;
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if(selector == ALL_PARTITIONS)
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return;
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n_partitions = _be32(b);
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if(_be32(b + 4)-(0x40000>>2) >0x50)
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wbfs_fatal("cannot modify this partition table. Please report the bug.");
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b += (_be32(b + 4)-(0x40000>>2))*4;
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j=0;
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for (i = 0; i < n_partitions; i++){
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partition_offset = _be32(b + 8 * i);
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partition_type = _be32(b + 8 * i+4);
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if(!test_parition_skip(partition_type,selector))
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{
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b32 = (u32*)(b + 8 * j);
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b32[0] = wbfs_htonl(partition_offset);
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b32[1] = wbfs_htonl(partition_type);
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j++;
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}
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}
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b32 = (u32*)(partition_table);
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*b32 = wbfs_htonl(j);
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}
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