(01-22-2023, 06:11 PM)Hollow Wrote: Hello?  Are you there?  Could you direct me to or recommend a hex editor that allows me to both XOR and re-save the file as an .astc file?  I can't go any further at the moment.

(12-10-2022, 09:42 PM)rufaswan Wrote: Actually @bihaiorg already posted the solution, the code from 52pojie.cn looks very complex, but it can be simplified to

Code:

if ( v10 == *(_QWORD *)"VEGATOPJOY000000VEGATOPJOY000000N7cocos2d5ImageE" )
   {
     v33 = v10;
     v34 = v9;
     v35 = v11;
     v3 -= 16;
     v12 = v4[23];
     v4 += 16;
     *v4 ^= 0x51u;
     v4[1] = v4[1] ^ 0x49;
     v4[2] = v4[2] ^ 0x51;
     v4[3] = v4[3] ^ 0x49;
     v4[4] = v4[4] ^ 0x41;
     v4[5] = v4[5] ^ 0x4E;
     v4[6] = v4[6] ^ 0x52;
     v4[7] = v12 ^ 0x41;
     v4[8] = v4[8] ^ 0x4E;
     v4[9] = v4[9] ^ 0x58;
     v4[10] = v4[10] ^ 0x49;
     v4[11] = v4[11] ^ 0x41;
     v4[12] = v4[12] ^ 0x4F;
     v4[13] = v4[13] ^ 0x42;
     v4[14] = v4[14] ^ 0x45;
     v4[15] ^= 0x49u;
   }

What the code basically means - check the first 16 bytes for "VEGATOPJOY000000", then XOR the next 16 bytes with "51 49 51 49 41 4e 52 41 4e 58 49 41 4f 42 45 49". That is the ASTC image header. The rest are ASTC image data, and they are unencrypted..

Re-save the ASTC image part as *.ASTC file, and you can use this tool to convert them
https://github.com/ARM-software/astc-encoder/releases

Run in command line like this

Code:

astcenc-sse2.exe  -dl  IN.ASTC   OUT.PNG

The tool can also encode the edited PNG back. Just XOR the ASTC header, and then prepend "VEGATOPJOY000000" back to the file. It's very easy.

Thanks for @bihaiorg for figured the whole thing out and sharing the code!
- Rufas

Quote:It is the example of decoded files. .PNG is the original file. .PNG.ASTC is the re-saved file. .PNG.ASTC.PNG is the output file by `astcenc` tool from github.
https://cdn.discordapp.com/attachments/1058766026105421886/1058931094050840626/sfduel_example.zip

(02-24-2023, 09:21 AM)rufaswan Wrote: In case you missed it, I already given you an example. You can use it to compare what you got, to see if you done it correctly. So here it is again:

Quote:It is the example of decoded files. .PNG is the original file. .PNG.ASTC is the re-saved file. .PNG.ASTC.PNG is the output file by `astcenc` tool from github.
https://cdn.discordapp.com/attachments/1058766026105421886/1058931094050840626/sfduel_example.zip

Also, from your screenshot, you XOR the whole file instead just the 16 bytes header.

Good luck!
- Rufas

(03-02-2023, 03:12 PM)JacintaB2022 Wrote: The English version of the game is released, and I've looked into it's apk, but I can't find the game's graphic data files from that version (though I've already extracted it's app icons). Maybe the files on that version are all encrypted or something...

(02-24-2023, 10:36 PM)Hollow Wrote:

(02-24-2023, 09:21 AM)rufaswan Wrote: In case you missed it, I already given you an example. You can use it to compare what you got, to see if you done it correctly. So here it is again:

Quote:It is the example of decoded files. .PNG is the original file. .PNG.ASTC is the re-saved file. .PNG.ASTC.PNG is the output file by `astcenc` tool from github.
https://cdn.discordapp.com/attachments/1058766026105421886/1058931094050840626/sfduel_example.zip

Also, from your screenshot, you XOR the whole file instead just the 16 bytes header.
Good luck!
- Rufas

Sorry, but that wasn't very helpful.  I saw the example.  I still don't know what went wrong.  That hex editor I used seems like it doesn't account for editing a single line of 16 bytes.  The other hex editors I have are HxD (doesn't have an XOR function), Hex Editor Neo (doesn't support saving files under different formats properly) and Hiew32 Demo Version (I don't know my way around it.)
What hex editor did you personally use?  Honestly a video tutorial for this sort of thing helps for those of us who aren't programmers.

https://www.vg-resource.com/thread-34303.html?highlight=kof
Replace the first sixteen bytes of the picture file, and use the bms of this post to decrypt it. Before using the bms, modify the export name first, and finally convert the decrypted astc file to png.

   
   
   
   

(03-05-2023, 04:44 PM)bymutou Wrote:

(02-24-2023, 10:36 PM)Hollow Wrote:

(02-24-2023, 09:21 AM)rufaswan Wrote: In case you missed it, I already given you an example. You can use it to compare what you got, to see if you done it correctly. So here it is again:

Also, from your screenshot, you XOR the whole file instead just the 16 bytes header.
Good luck!
- Rufas

Sorry, but that wasn't very helpful.  I saw the example.  I still don't know what went wrong.  That hex editor I used seems like it doesn't account for editing a single line of 16 bytes.  The other hex editors I have are HxD (doesn't have an XOR function), Hex Editor Neo (doesn't support saving files under different formats properly) and Hiew32 Demo Version (I don't know my way around it.)
What hex editor did you personally use?  Honestly a video tutorial for this sort of thing helps for those of us who aren't programmers.

https://www.vg-resource.com/thread-34303.html?highlight=kof
Replace the first sixteen bytes of the picture file, and use the bms of this post to decrypt it. Before using the bms, modify the export name first, and finally convert the decrypted astc file to png.

(03-07-2023, 03:29 AM)Hollow Wrote: So I've finally managed to decrypt some images:



I've done about 16 images in total, but the process for this is actually quite tedious.  Now that we understand how to decrypt them, I have to imagine there is a script or tool that can be made at some point to automate the entire process, from decrypting the image header to converting the astc files to png format.  I understand bihaiorg has a tool but there's been no response from him in regards to any updates, even after DM'ing and email.  There are 7,646 image files in total, mostly PNG files and some JPG.

(03-07-2023, 03:29 AM)Hollow Wrote: So I've finally managed to decrypt some images:



I've done about 16 images in total, but the process for this is actually quite tedious.  Now that we understand how to decrypt them, I have to imagine there is a script or tool that can be made at some point to automate the entire process, from decrypting the image header to converting the astc files to png format.  I understand bihaiorg has a tool but there's been no response from him in regards to any updates, even after DM'ing and email.  There are 7,646 image files in total, mostly PNG files and some JPG.

(03-09-2023, 03:46 AM)bymutou Wrote:

(03-07-2023, 03:29 AM)Hollow Wrote: So I've finally managed to decrypt some images:



I've done about 16 images in total, but the process for this is actually quite tedious.  Now that we understand how to decrypt them, I have to imagine there is a script or tool that can be made at some point to automate the entire process, from decrypting the image header to converting the astc files to png format.  I understand bihaiorg has a tool but there's been no response from him in regards to any updates, even after DM'ing and email.  There are 7,646 image files in total, mostly PNG files and some JPG.

Friend, I modified the BMS, and now I do n’t need to replace the first 16 bytes, and then use the ASTCTOPNG.BAT in the bag to convert the decoded ASTC file. Remember to put the three exe of ASTC in the BAT in the same directory in the same directory.

(03-10-2023, 05:15 PM)Hollow Wrote:

(03-09-2023, 03:46 AM)bymutou Wrote:

(03-07-2023, 03:29 AM)Hollow Wrote: So I've finally managed to decrypt some images:



I've done about 16 images in total, but the process for this is actually quite tedious.  Now that we understand how to decrypt them, I have to imagine there is a script or tool that can be made at some point to automate the entire process, from decrypting the image header to converting the astc files to png format.  I understand bihaiorg has a tool but there's been no response from him in regards to any updates, even after DM'ing and email.  There are 7,646 image files in total, mostly PNG files and some JPG.

Friend, I modified the BMS, and now I do n’t need to replace the first 16 bytes, and then use the ASTCTOPNG.BAT in the bag to convert the decoded ASTC file. Remember to put the three exe of ASTC in the BAT in the same directory in the same directory.

This was very helpful, thank you.  Do you or anyone else know of a program that can rip individual sprites from these kinds of sheets?

The image I uploaded is rather simple, since I can't go over the 500kb limit, but it's just an example.
Btw, is it possible to make those scripts compatible with .jpg files as well?  There are a little over 300 jpg images within the 'release' directory.

(03-10-2023, 08:40 PM)bymutou Wrote:

(03-10-2023, 05:15 PM)Hollow Wrote:

(03-09-2023, 03:46 AM)bymutou Wrote: Friend, I modified the BMS, and now I do n’t need to replace the first 16 bytes, and then use the ASTCTOPNG.BAT in the bag to convert the decoded ASTC file. Remember to put the three exe of ASTC in the BAT in the same directory in the same directory.

This was very helpful, thank you.  Do you or anyone else know of a program that can rip individual sprites from these kinds of sheets?

The image I uploaded is rather simple, since I can't go over the 500kb limit, but it's just an example.
Btw, is it possible to make those scripts compatible with .jpg files as well?  There are a little over 300 jpg images within the 'release' directory.

https://en.esotericsoftware.com/spine-download You can use this software to split sprites,Although the trial version cannot export things, it can be split,Bms scripts also support jpg

(03-10-2023, 09:04 PM)Hollow Wrote:

(03-10-2023, 08:40 PM)bymutou Wrote:

(03-10-2023, 05:15 PM)Hollow Wrote: This was very helpful, thank you.  Do you or anyone else know of a program that can rip individual sprites from these kinds of sheets?

The image I uploaded is rather simple, since I can't go over the 500kb limit, but it's just an example.
Btw, is it possible to make those scripts compatible with .jpg files as well?  There are a little over 300 jpg images within the 'release' directory.

https://en.esotericsoftware.com/spine-download You can use this software to split sprites,Although the trial version cannot export things, it can be split,Bms scripts also support jpg

Sorry, I should have specified.  The astc encoder tool doesn't support .jpg, the bat file you shared also doesn't support it.