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Honkai Impact 3rd archive encryption

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toastyengineer
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Honkai Impact 3rd archive encryption

Post by toastyengineer » Mon May 18, 2020 8:02 pm

Hey everyone,
So more or less recently, MiHoyo started to encrypt the unity 3d assets and textures for Honkai Imapct.
For some reason they have a ".wmv" extension. They come in 186 "blocks" about 50 mb each, and there is also a "BlockMeta.xmf" and "Blocks.xmf" file contained in the Asb folder (probably for indexing?).

Of course i already tried the basic programs like AssedStudio to try and extract these, but without success

I included 1 of the blocks and the 2 index files (probably?).
https://mega.nz/file/P0ZnDY6b#TIFRgD9B- ... HDNA4ap280

I would really appreciate it if someone could have a look an check if there is a way to extract these 3d models or textures.

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Bigchillghost
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Re: Honkai Impact 3rd archive encryption

Post by Bigchillghost » Tue May 19, 2020 6:26 am

Can't help with the encryption but you can use this BMS script to unpack the unity3d assets from the wmf container.
wmfUnpack.zip
Pick the "Blocks.xmf" file or anything as input as the script'll open it automatically. Just make sure the wmv files reside in the same path.
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Last edited by Bigchillghost on Wed May 20, 2020 2:12 am, edited 1 time in total.
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toastyengineer
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Re: Honkai Impact 3rd archive encryption

Post by toastyengineer » Tue May 19, 2020 7:36 pm

Hello

Thanks alot for your help!
Unfortounately i get an error when using the script, i attached the screenshot. I will see if i can solve it myself.
QfXpbMMSX5.png
I will edit if i manage to fix it.
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Re: Honkai Impact 3rd archive encryption

Post by toastyengineer » Tue May 19, 2020 7:47 pm

Figured it out, it was probably just some reference error, i deleted the open "block.xmf" part and selected it manually and it worked :)

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Bigchillghost
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Re: Honkai Impact 3rd archive encryption

Post by Bigchillghost » Wed May 20, 2020 2:17 am

toastyengineer wrote:
Tue May 19, 2020 7:36 pm
Unfortounately i get an error when using the script, i attached the screenshot.
I see. Was misplacing the parameters of "open" at final step but without testing. Sorry about that. [roll]
Script updated at the same post.
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Re: Honkai Impact 3rd archive encryption

Post by mircea » Sun May 24, 2020 11:25 pm

toastyengineer wrote:
Tue May 19, 2020 7:47 pm
Figured it out, it was probably just some reference error, i deleted the open "block.xmf" part and selected it manually and it worked :)
Anything on the decyption though?. I got no luck finding anything about that.

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Re: Honkai Impact 3rd archive encryption

Post by toastyengineer » Wed May 27, 2020 3:05 pm

It seems to be a UnityFS archive. Tried to use different tools but, but it did not work. That's all i found out so far :oops:

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Re: Honkai Impact 3rd archive encryption

Post by mircea » Wed Jun 10, 2020 12:49 pm

I have here a file example , perhaps some with more knowledge can help.
Link https://mega.nz/file/RoNwnARD#6mDO_0138 ... vlMt3k3vdk

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Re: Honkai Impact 3rd archive encryption

Post by mircea » Wed Jun 24, 2020 10:32 pm

If anyone can give a hand with the unity FSachive thing would be highly apreciated. Google seems to not be of use since it gives me only the wrong results of what i search .

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BuIlDaLiBlE
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Re: Honkai Impact 3rd archive encryption

Post by BuIlDaLiBlE » Thu Jun 25, 2020 10:14 am

There was an anonymous reply that linked a certain chinese blog about this, but the reply was removed for unknown reason.
Since I'm not sure if it was directly related to the blog I'll post the link to it again: https://blog.palug.cn/. I don't understand what's going on in his "analysis", but it's at least something.

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