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POIs it possible to replace a string (zipped) code from apk dalvik
 

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  1. POIs it possible to replace a string (zipped) code from apk dalvik
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    <p>I would like to replace a single string from the hex/dalvik apk code. I realize this would entail finding how the string gets encoded when it is converted from an Android class project into a signed apk file.</p> <p>Is this possible? Well, I know in code, anythings possible.. but does anyone here know how to do it? I have learned that it's possible to delete and add to .apk files on a windows platform with a simple zip archive (such as replacing icons for the SystemUI.apk), without breaking the apk.. but how would one do it programmatically? Specifically in python?</p> <p>Does anyone have any ideas on how to do this?</p> <p>I have tried:</p> <pre><code>import zipfile zf=zipfile.ZipFile('APK.apk') # my zip file for filename in ['classes.dex']: # zipped file content file data=zf.read(filename) data=data.replace('mystring','newstring') #replace string within the content file file=open('classes.dex','wb') file.write(data) # write NEW content file to local disk file.close() zin=zipfile.ZipFile('APK.apk','r') # create zip in and zip out zout=zipfile.ZipFile('APK.apk','w') # iterate through zipped contents and for item in zin.infolist(): # copy all EXCEPT 'classes.dex' content file buffer=zin.read(item.filename) if (item.filename!='classes.dex'): zout.writestr(item,buffer) zout.close() zin.close() zf=zipfile.ZipFile('APK.apk',mode='a') # finally, add new content file from my local disk zf.write('classes.dex',arcname='classes.dex') zf.close() </code></pre> <p>This takes the original APK.apk file, and rewrites a string within one of the zipped content files, then repacking it back to APK.apk. Problem is: ORIGINAL APK.apk = 170 kb NEW APK.apk = 399 kb and NOT INSTALLABLE, the apk was "broken", and the Android system won't install the apk.</p>
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    1. USDiamond Dave
    1. USDiamond Dave
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    1. VO
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      1. VTDownMod
    2. VO
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      1. VTUpMod
    1. COI don't know anything about apk's, but if you say that it is essentially a zip file, than you should look into the [zipfile](http://docs.python.org/2/library/zipfile) module.
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      1. USBrtH
    2. COI have tried, zipfile is useful, and it seems to unzip the apk file and contents just fine, but it's the re-zipping that's the problem. I've tried every possible compression type I can find, but strangely zipfile "knows" which compression to UNcompress with, but I can't seem to REcompress in the same way, as the file sizes of the zipped content file changes drastically when comparing the original to the recompressed.
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      1. USDiamond Dave
    3. COplease see Question edit..
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      1. USDiamond Dave
 

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