Encrypted strings not removed because stack traces aren't emulated

[ghost]

I don't know if my issue is related to issue #97
I tring to simply this apk http://www8.zippyshare.com/v/vQTFFChK/file.html Uret Patcher v3.5.apk,
you can find it on https://jasi2169.wordpress.com/ , this apk encrypt strings with a variable key which depends on method call.

    StackTraceElement v1 = new RuntimeException().getStackTrace()[1];
    String v4 = new StringBuffer(v1.getMethodName()).insert(0, v1.getClassName()).toString();
    // code with xor and string v4

command line used is

java -jar simplify/build/libs/simplify.jar /tmp/Uret\ Patcher\ v3.5.apk -o /tmp/output.apk --output-api-level 23 --max-address-visits 100000 -it 'com/android/vendind'

but also

java -jar simplify/build/libs/simplify.jar /tmp/Uret\ Patcher\ v3.5.apk -o /tmp/prova.apk --output-api-level 23 --max-address-visits 100000 -it 'com/android/vendind' -et 'android/support'

is not working.
If is useful I can attach full output.

Simplification complete:
total classes = 842
total methods = 0
optimized methods = 22
failed methods = 1
run time = 435587 ms
Total optimizations:
constantized ifs = 0
constantized ops = 0
dead assignments removed = 0
dead ops removed = 0
dead results removed = 0
nops removed = 0
peephole optmizations = 0
unreflected fields = 0
unreflected methods = 0
useless gotos removed = 0
Writing output to /tmp/output.apk

[CalebFenton]

Thanks for the detailed report. I'm pretty sure this is a related issue: related issue is #12.

The problem is that right now, simplify doesn't emulate methods which get stack traces, though I've made some effort on making this possible. It's just never been a priority.

I think the way this needs to be fixed is by finding out which methods to emulate (start with Exception;->getStackTrace()), and implement them. There may be some changes that need to happen in smalivm for them to work properly, but I don't think it'll be too bad.

You can always try dex-oracle, which actually runs the code, though you'd have to make a plugin for it.

[ghost]

no luck also with dex-oracle.
This time the strings are decrypted but with wrong key. I will open an issue on other repository and I will try to analyze the issue.

Thanks for your suggestions.

[CalebFenton]

Going to close this in favor of #12.