How does Android split APK? What part of APK is stored in /data/app and 
what part is stored in /data/app-asec?

On Monday, September 23, 2013 7:53:34 PM UTC+5:30, gauri wrote:
>
> Thanks Nikolay!!!
> I read your blog also....
> http://nelenkov.blogspot.in/2012/07/using-app-encryption-in-jelly-bean.html
>
> On Thursday, September 19, 2013 9:52:24 PM UTC+5:30, Nikolay Elenkov wrote:
>>
>> On Thu, Sep 19, 2013 at 4:27 PM, gauri <[email protected]> wrote: 
>> > Hello, 
>> > 
>> > The android app downloaded/purchased from Google Play is stored in 
>> > "/data/app" directory. 
>> > Does Play Store or android system modify the apk after download? 
>>
>> Not for free apps. 
>>
>> > When I purchase it from Play store, after my app launch, digest 
>> verification 
>> > is getting failed. 
>> > I found that the message digest which I have stored in app and the 
>> digest 
>> > which I am calculating at run time are differing. 
>>
>> On 4.1+, paid apps are forward locked by default, which is implemented 
>> by splitting the APK in a public (in /data/app) and private part 
>> (in /data/app-asec). You are most probably calculating the hash of the 
>> public part only, hence the mismatch. If you have a rooted device 
>> you can verify by searching for you package name in /data/app-asec. 
>>
>

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