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NetEase NPK (EXPK) Archive Decryptor

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Bigchillghost
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NetEase NPK (EXPK) Archive Decryptor

Post by Bigchillghost » Sun Jul 07, 2019 4:05 pm

- Feature:
Decrypt encrypted NPK archives with "EXPK" signature and write the data back into the source archive.

- Usage:
The encryption key is not included in the attachment. You can get one here. Copy all the files (includes the key file) into your working directory and run the batch file.

- Supported Games:
MARVEL Super War (Unreleased)
Onmyoji Arena

- About Encryption Key:
The two games above use simple xor for encryption, but with an infinite fixed sequence as key. I only managed to figure out 57 bytes of it. The rest is taken from this page (credit to zhouhang95). This key also is not complete but it's enough to cover most of the compressed data. Without knowing the method of how the key is computed, this might be the easiest solution.
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Last edited by Bigchillghost on Sat Aug 10, 2019 4:40 am, edited 3 times in total.
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heyongqing19980227
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Re: NetEase NPK (EXPK) Archive Decryptor

Post by heyongqing19980227 » Sun Jul 07, 2019 4:42 pm

thank you
Last edited by heyongqing19980227 on Thu Jul 11, 2019 6:49 am, edited 1 time in total.

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Re: NetEase NPK (EXPK) Archive Decryptor

Post by huitbgoiouythy » Mon Jul 08, 2019 9:32 am

Thank you! Gonna test this out for Marvel Super War.

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Re: NetEase NPK (EXPK) Archive Decryptor

Post by wansf » Mon Jul 08, 2019 11:03 am

epic :eek:
will u keep adding more key in the future?

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Re: NetEase NPK (EXPK) Archive Decryptor

Post by Bigchillghost » Tue Jul 09, 2019 10:01 am

Update:
Fixed a stupid bug that cause the decryption failed with Onmyoji Arena. Added support for Win XP.
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Re: NetEase NPK (EXPK) Archive Decryptor

Post by Bigchillghost » Tue Jul 16, 2019 12:24 pm

Update:
Fixed another bug that introduced by previous fix. Sorry about that. :lol:
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Re: NetEase NPK (EXPK) Archive Decryptor

Post by Bigchillghost » Sat Aug 10, 2019 4:42 am

Update:
1. Changed the detecting method to adjust with different version games;
2. Fixed an issue for decrypting MARVEL Super War.
May you find peace in this puzzle-solving game. Say it with action: click the Image when you get helped.:)

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