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How do I get the signature checksum of my APK?

I would like to use the signature checksum instead of the batch checksum when setting up a device with a device owner app. The application will be downloaded from the http server.

This post is great for using EXTRA_PROVISIONING_DEVICE_ADMIN_PACKAGE_CHECKSUM: Checksum error while configuring Android Lollipop

But I would like to use EXTRA_PROVISIONING_DEVICE_ADMIN_SIGNATURE_CHECKSUM. See: https://developer.android.com/reference/android/app/admin/DevicePolicyManager.htm

Provisioning app and device owner app will run on Android O.

How do I get the signature checksum of my app that I can use on my NFC key / value pair?

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1 answer


try it

keytool -list -printcert -jarfile [path_to_your_apk] | grep -Po "(?<=SHA256:) .*" | xxd -r -p | openssl base64 | tr -d '=' | tr -- '+/=' '-_'


More details:

  • keytool -list -printcert -jarfile [path_to_your_apk]

    retrieves information about the APK certificate,
  • grep -Po "(?<=SHA256:) .*" | xxd -r -p

    takes a SHA256 hash and converts it to binary,
  • openssl base64

    encodes it using base64,
  • tr -d '=' | tr -- '+/=' '-_'

    makes it URL safe ( +

    encoded as -

    , /

    encoded as _

    , and whitespace =

    removed).
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