Cannot decrypt Android mmkv files when key contains negative bytes

[quizliu]

Hi spak9,

I'm trying to decrypt mmkv file from an Android project. I have the encrypted mmkv file and the crc file and the 16-byte key. I can perform the decryption with a key only has positive bytes, but not with a key has negative bytes, since Java's byte value has a range (-128, 127).

I also tried with converting byte array to a hex-string and pass the hex-string as the decryption key in python, but it doesn't work. Do you have any clue about this issue? Thanks!

[spak9]

Hi quizliu,

Thanks for creating an issue, it's been awhile since I've spent time with MMKV and the visualizer as a whole. One thing that might be a quick win is figuring out which MMKV version you're using. Would you mind sharing the version in terms of its releases

[quizliu]

I'm using mmkv-static 1.2.10 which can be found on maven repository: https://mvnrepository.com/artifact/com.tencent/mmkv-static/1.2.10

I'm not sure if the 'mmkv-static' version matches the release page you linked, and I find they have an artifact called mmkv, which has the same version number and release date to the release page:
https://mvnrepository.com/artifact/com.tencent/mmkv

[spak9]

Thanks for the update, I will try to troubleshoot a bit this weekend and get back to you.