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Editorial Team
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Asked: 2026-05-15T12:01:22+00:00

We need to enable our customers to update some components in Android application, like

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We need to enable our customers to update some components in Android application, like icon/logo, dictionary file etc.

I saw the .APK can be opened like a JAR with 7-zip, and hope files can be edited/replaced there. But it is need to update MANIFEST.MF file in it, containing a digest for each .APK component’ like:

Manifest-Version: 1.0
Created-By: 1.0 (Android)

Name: res/raw/icon.png
SHA1-Digest: 6Un2G/VIkYfIGfMxruadIHtDABc=

Name: res/raw/logo.png
SHA1-Digest: zsIQqGWSu9w5m7gsl0jQoziy7JA=
…

How to update these digests?

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1 Answer

  1. Editorial Team

    The SHA1-digest entries are base64-encoded strings of digests computed using SHA1 algorithm. You’ll also have to update Cert.rsa and Cert.sf though, the .rsa file contains the actual digital signature. You can start with http://java.sun.com/developer/Books/javaprogramming/JAR/sign/intro.html for more info.

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