(10-08-2021, 07:35 AM)tombmonkey Wrote: So, this game's images have a .png extension but I'm not sure if they have been protected or if they are packed in some form.

Spine files (skel, atlas) and plist are not protected, so maybe images aren't either, either way it's beyond my skillset.

Can someone look into the .png files and see if they are packed in some way or protected?

https://www.mediafire.com/file/n1p0i8stcmw0jkb/00.rar/file

Here's an entire archive, I think it corresponds to a single character.

(10-30-2022, 02:04 PM)tombmonkey Wrote: Could you share the tool to decrypt the image headers please? I have had this problem for a long time without any solution.

ipengci (github) Wrote:Repacking
Repacking is not yet implemented, maybe never.

Note:
This is in progressing, sorry for the delay! Please send e-mail to 326812493@139.com to get the tools by now.

(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

(12-20-2022, 08:52 PM)Hollow Wrote: "Re-save the ASTC image part as *.ASTC file"

Pardon me, how exactly do I accomplish this?  Is there an option for this in the hex editor?

(12-24-2022, 08:21 PM)rufaswan Wrote:

(12-20-2022, 08:52 PM)Hollow Wrote: "Re-save the ASTC image part as *.ASTC file"

Pardon me, how exactly do I accomplish this?  Is there an option for this in the hex editor?

If you are using a hex editor and doing it manually,

1. use the DELETE key to remove "VEGATOPJOY000000" (the first 16 bytes of the file).
2. Now, the first 16 bytes of the file is the ASTC image header, you'll need to XOR with the key above.
3. Re-save the file by File -> Save as and change the file extension from .png to .astc.

To encode back, reverse the 3 steps above.
- Rufas

(12-24-2022, 08:21 PM)rufaswan Wrote:

(12-20-2022, 08:52 PM)Hollow Wrote: "Re-save the ASTC image part as *.ASTC file"

Pardon me, how exactly do I accomplish this?  Is there an option for this in the hex editor?

If you are using a hex editor and doing it manually,

1. use the DELETE key to remove "VEGATOPJOY000000" (the first 16 bytes of the file).
2. Now, the first 16 bytes of the file is the ASTC image header, you'll need to XOR with the key above.
3. Re-save the file by File -> Save as and change the file extension from .png to .astc.

To encode back, reverse the 3 steps above.
- Rufas