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New app unscrambles Wii games into ISOs - Destructoid

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New app unscrambles Wii games into ISOs


12:41 PM on 12.21.2006
New app unscrambles Wii games into ISOs photo



We just received a tip about a new Windows GNU app today called the "GOD/WOD unscrambler" which allegedly reads raw data from a Wii game* and dumps ISO files to your PC for later mischevious use. Since there is neither a Wii emulator or a mod chip for the Wii, it is impossible to verify if the output is an elaborate ploy to drop a binary middle finger on your C: drive, but the Chilean engineering student Victor Muñoz is pretty damn proud of his software.  He's created very detailed readme files, released the source on GNU.  He compares the process to DVD ripping and has an unassuming little download link on his site. Do you feel a disturbance in the force, Reggie?  He should, because this kid apparently also has the balls of Kong. He blogged on it's simplicity:

Command-line example:

unscrambler.exe RZDE01.WOD “Twilight Princess.ISO”
GOD/WOD unscrambler 0.4 (xt5@ingenieria-inversa.cl)

This program is distributed under GPL license,
see the LICENSE file for more info.

caching seed 0100 ... caching seed 0700
image successfully unscrambled.
time elapsed: 481.00 seconds. 

*Update: To be clear, this app is not like the infamous DeCSS DVD Decrypter. To make a Wii ISO, you need to first modify the firmware of your DVD drive to allow Wii disks to be read. One commenter on Victor's site suggests using either Mastering hardware or modify your DVD firmware to disable ECD (error checking code). In other words -- the first step of the process is definitely not for n00bs. This app then descrambles that dumped file into the ISO. In other words, this program facilitates that second step if can get past step 1.

To be fair, what he's done isn't full blown piracy.  It's just accessory to the invevitable torrent Festivus ... aka SUCKS 2BU glimpse of the future.  Whatever your ethical take on it may be, it's obviously not for making brownies. We just hope he's smart enough to shred his Sony pay stubs when the non-existant Chilean anti-piracy task force comes a-knockin'. Oh no! But Niero, why must you suggest Sony has anything to do with this? I'm kidding, but he's also apparently coded a Microsoft Xbox security code dumper.  Someone buy this kid a PlayStation! Check out the Chile national anthem below.

[Thanks Startreker!]

/*
unscrambler 0.4: unscramble not standard IVs scrambled DVDs thru
bruteforce, intended for Gamecube/WII Optical Disks.

Copyright (C) 2006  Victor Muñoz (xt5@ingenieria-inversa.cl)

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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include <stdio.h>
#include <string.h>
#include <time.h>
#include "ecma-267.h"

#define MAX_SEEDS 4

unsigned char b_in[0x8100];
unsigned char b_out[0x8000];

typedef struct t_seed {
    int seed;
    unsigned char streamcipher[2048];
} t_seed;


t_seed _seeds[(MAX_SEEDS+1)*16];

/* swap the endianess of a 32bit integer */
unsigned int swap32(unsigned int p) {
    return p<<24|((p<<8)&0xFF0000)|((p>>8)&0xFF00)|(p>>24);
}

/* add a seed to the cache */
t_seed *add_seed(t_seed *seeds, unsigned short seed) {
    int i;
        
    printf("caching seed %04x\n", seed);

    if(seeds->seed==-2) return NULL;

    seeds->seed=seed;
      
    LFSR_init(seeds->seed);

    for(i=0; i<2048; i++) seeds->streamcipher[i]=LFSR_byte();
    
    return seeds;
}

/* test if the current seed is the one used for this sector, the check is done
comparing the EDC generated, with the one at the bottom of sector */
int test_seed(int j) {
    int i;
    unsigned char buf[2064];
      
    LFSR_init(j);

    memcpy(buf, b_in, 2064);
    for(i=12; i<2060; i++) buf[i]^=LFSR_byte();
    if(edc_calc(0x00000000, buf, 2060) == swap32(*( (unsigned int *) (&b_in[2060]) )) ) {
        return 0;
    }
    return -1;
}

/* unscramble a complete frame, based on the seed already cached */
int unscramble_frame(t_seed *seed, unsigned char *_bin, unsigned char *_bout) {
    unsigned char *bin;
    unsigned char *bout;
    unsigned int edc;
    unsigned int *_4bin;
    unsigned int *_4cipher;
    
    int i,j;
    
    for(j=0; j<16; j++) {
      
        bin=&_bin[0x810*j];
        bout=&_bout[0x800*j];
        
        _4bin=(unsigned int *)&bin[12];
        _4cipher=(unsigned int *)seed->streamcipher;

        for(i=0; i<512; i++) _4bin[i]^=_4cipher[i];
        memcpy(bout, bin+6, 2048); // copy CPR_MAI bytes
        
        edc=edc_calc(0x00000000, bin, 2060);
        if(edc != swap32(*( (unsigned int *) (&bin[2060]) )) ) {
            printf("error: bad edc (%08x) must be %08x\n", edc, swap32(*( (unsigned int *) (&bin[2060]) )));
            return -1;
        }
    }
    
    return 0;
}

int main(int argc, char *argv[]) {
    int i,j,s;
    int ret;
    
    FILE *in, *out;
    
    time_t start;
    
    t_seed *seeds;
    t_seed *current_seed;
    
    printf("GOD/WOD unscrambler 0.4 (xt5@ingenieria-inversa.cl)\n\n"
           "This program is distributed under GPL license, \n"
           "see the LICENSE file for more info.\n\n");
    if(argc<3) {
        printf("%s input output\n",argv[0]);
        return 0;
    }
    
    in=fopen64(argv[1],"rb");
    if(!in) {
        fprintf(stderr, "can't open %s\n", argv[1]);
        return 1;
    }
    out=fopen64(argv[2],"wb");
    if(!out) {
        fprintf(stderr, "can't open %s\n", argv[2]);
        return 2;
    }
    
    for(i=0; i<16; i++) {
        for(j=0; j<MAX_SEEDS; j++) {
            _seeds[i*MAX_SEEDS+j].seed=-1;
        }
        _seeds[i*MAX_SEEDS+j].seed=-2;
    }
    
    ret=0;
    
    s=0;
    start=time(0);
    
    do {
        fread(b_in, 1, 0x8100, in);
        
        seeds=&_seeds[((s>>4)&0xF)*MAX_SEEDS];
        while((seeds->seed)>=0) {
            if(!test_seed(seeds->seed)) {
                current_seed=seeds;
                goto seed_found;
            }
            seeds++;
        }
        
        for(j=0; j<0x7FFF; j++) {
            if(!test_seed(j)) {
                current_seed=add_seed(seeds,j);
                //printf("caching at %x\n", s);
                if(current_seed==NULL) {
                    fprintf(stderr, "no enough cache space for this seed.\n");
                    ret=3;
                    goto finish;
                }
                goto seed_found;
            }
        }
        fprintf(stderr, "no seed found for recording frame %d.\n", s>>4);
        ret=4;
        goto finish;
        
        seed_found:
        
        if(unscramble_frame(current_seed, b_in, b_out)) {
            fprintf(stderr, "error unscrambling recording frame %d.\n", s>>4);
            ret=5;
            goto finish;
        }
        
        if(fwrite(b_out, 1, 0x8000, out)!=0x8000) {
            fprintf(stderr, "can't write to the output file, check if there is enough free space.\n");
            ret=6;
            goto finish;        
        }
        
        s+=16;
    } while(!feof(in));
    
    printf("image successfully unscrambled.\n");
    
    finish:
    
    printf("time elapsed: %.2lf seconds.\n", difftime(time(0), start));

    fclose(in);
    fclose(out);

    return ret;
}

ECMA 267 C

 

/*
unscrambler 0.4: unscramble not standard IVs scrambled DVDs thru
bruteforce, intended for Gamecube/WII Optical Disks.

Copyright (C) 2006  Victor Muñoz (xt5@ingenieria-inversa.cl)

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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include "ecma-267.h"

/* EDC stuff */
unsigned int edc_table[256] = {
    0x00000000, 0x80000011, 0x80000033, 0x00000022, 0x80000077, 0x00000066, 0x00000044, 0x80000055,
    0x800000FF, 0x000000EE, 0x000000CC, 0x800000DD, 0x00000088, 0x80000099, 0x800000BB, 0x000000AA,
    0x800001EF, 0x000001FE, 0x000001DC, 0x800001CD, 0x00000198, 0x80000189, 0x800001AB, 0x000001BA,
    0x00000110, 0x80000101, 0x80000123, 0x00000132, 0x80000167, 0x00000176, 0x00000154, 0x80000145,
    0x800003CF, 0x000003DE, 0x000003FC, 0x800003ED, 0x000003B8, 0x800003A9, 0x8000038B, 0x0000039A,
    0x00000330, 0x80000321, 0x80000303, 0x00000312, 0x80000347, 0x00000356, 0x00000374, 0x80000365,
    0x00000220, 0x80000231, 0x80000213, 0x00000202, 0x80000257, 0x00000246, 0x00000264, 0x80000275,
    0x800002DF, 0x000002CE, 0x000002EC, 0x800002FD, 0x000002A8, 0x800002B9, 0x8000029B, 0x0000028A,
    0x8000078F, 0x0000079E, 0x000007BC, 0x800007AD, 0x000007F8, 0x800007E9, 0x800007CB, 0x000007DA,
    0x00000770, 0x80000761, 0x80000743, 0x00000752, 0x80000707, 0x00000716, 0x00000734, 0x80000725,
    0x00000660, 0x80000671, 0x80000653, 0x00000642, 0x80000617, 0x00000606, 0x00000624, 0x80000635,
    0x8000069F, 0x0000068E, 0x000006AC, 0x800006BD, 0x000006E8, 0x800006F9, 0x800006DB, 0x000006CA,
    0x00000440, 0x80000451, 0x80000473, 0x00000462, 0x80000437, 0x00000426, 0x00000404, 0x80000415,
    0x800004BF, 0x000004AE, 0x0000048C, 0x8000049D, 0x000004C8, 0x800004D9, 0x800004FB, 0x000004EA,
    0x800005AF, 0x000005BE, 0x0000059C, 0x8000058D, 0x000005D8, 0x800005C9, 0x800005EB, 0x000005FA,
    0x00000550, 0x80000541, 0x80000563, 0x00000572, 0x80000527, 0x00000536, 0x00000514, 0x80000505,
    0x80000F0F, 0x00000F1E, 0x00000F3C, 0x80000F2D, 0x00000F78, 0x80000F69, 0x80000F4B, 0x00000F5A,
    0x00000FF0, 0x80000FE1, 0x80000FC3, 0x00000FD2, 0x80000F87, 0x00000F96, 0x00000FB4, 0x80000FA5,
    0x00000EE0, 0x80000EF1, 0x80000ED3, 0x00000EC2, 0x80000E97, 0x00000E86, 0x00000EA4, 0x80000EB5,
    0x80000E1F, 0x00000E0E, 0x00000E2C, 0x80000E3D, 0x00000E68, 0x80000E79, 0x80000E5B, 0x00000E4A,
    0x00000CC0, 0x80000CD1, 0x80000CF3, 0x00000CE2, 0x80000CB7, 0x00000CA6, 0x00000C84, 0x80000C95,
    0x80000C3F, 0x00000C2E, 0x00000C0C, 0x80000C1D, 0x00000C48, 0x80000C59, 0x80000C7B, 0x00000C6A,
    0x80000D2F, 0x00000D3E, 0x00000D1C, 0x80000D0D, 0x00000D58, 0x80000D49, 0x80000D6B, 0x00000D7A,
    0x00000DD0, 0x80000DC1, 0x80000DE3, 0x00000DF2, 0x80000DA7, 0x00000DB6, 0x00000D94, 0x80000D85,
    0x00000880, 0x80000891, 0x800008B3, 0x000008A2, 0x800008F7, 0x000008E6, 0x000008C4, 0x800008D5,
    0x8000087F, 0x0000086E, 0x0000084C, 0x8000085D, 0x00000808, 0x80000819, 0x8000083B, 0x0000082A,
    0x8000096F, 0x0000097E, 0x0000095C, 0x8000094D, 0x00000918, 0x80000909, 0x8000092B, 0x0000093A,
    0x00000990, 0x80000981, 0x800009A3, 0x000009B2, 0x800009E7, 0x000009F6, 0x000009D4, 0x800009C5,
    0x80000B4F, 0x00000B5E, 0x00000B7C, 0x80000B6D, 0x00000B38, 0x80000B29, 0x80000B0B, 0x00000B1A,
    0x00000BB0, 0x80000BA1, 0x80000B83, 0x00000B92, 0x80000BC7, 0x00000BD6, 0x00000BF4, 0x80000BE5,
    0x00000AA0, 0x80000AB1, 0x80000A93, 0x00000A82, 0x80000AD7, 0x00000AC6, 0x00000AE4, 0x80000AF5,
    0x80000A5F, 0x00000A4E, 0x00000A6C, 0x80000A7D, 0x00000A28, 0x80000A39, 0x80000A1B, 0x00000A0AL
};

u32 edc_calc(u32 edc, u8 *ptr, u32  len) {
    while (len--) edc=edc_table[((edc>>24)^*ptr++)&0xFF]^(edc<<8);
    return edc;
}

/* end of EDC stuff */

/* LFSR stuff */

u16 ecma276_ivs[]= {
    0x0001, 0x5500, 0x0002, 0x2A00,
    0x0004, 0x5400, 0x0008, 0x2800,
    0x0010, 0x5000, 0x0020, 0x2001,
    0x0040, 0x4002, 0x0080, 0x0005
};


unsigned short LFSR;

void LFSR_ecma_init(int iv) {
     LFSR=ecma276_ivs[iv];
}

void LFSR_init(u16 seed) {
     LFSR=seed;
}

int LFSR_tick() {
    int ret;
    int n;
   
    ret=LFSR>>14;
   
    n=ret^((LFSR>>10)&1);
    LFSR=((LFSR<<1)|n)&0x7FFF;
   
    return ret;
}

unsigned char LFSR_byte() {
    u8 ret;
    int i;
   
    ret=0;
    for(i=0; i<8; i++) ret=(ret<<1)|LFSR_tick();
   
    return ret;
}

/* end of LFSR stuff */
 

 

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Each version is given a distinguishing version number.  If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation.  If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.

  10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission.  For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this.  Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.

                NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

             END OF TERMS AND CONDITIONS

        How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    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 program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

Also add information on how to contact you by electronic and paper mail.

If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:

    Gnomovision version 69, Copyright (C) year name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.

  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice

This General Public License does not permit incorporating your program into
proprietary programs.  If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.
 






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