Generate signed apk for React Native Android application using existing certificate

Question

I have an Android app certificate with a file type of FILE that was created back in 2012 for my Android app written in Java. Now I have updated that app using React Native.

How can I use the existing certificate to generate keystore and sign my updated app to be released on Google Play?

I've tried this even though the React Native certificate extension is .keystore

keytool -importcert -file "your.cer" -keystore your.jks -alias "<anything>"

and I got the following error

keytool error: java.lang.Exception: Input not an X.509 certificate

I expect to have a .keystore file that allows me to release an update of my existing Android app.

Rutvik Bhatt · Accepted Answer · 2019-07-12 07:17:23Z

4

You don't need to create keystore file. you can use existing jks file to sign the app. Do as follow:

Put your jks file in the app directory

add the following code in your gradle.poperties file.

MYAPP_RELEASE_STORE_FILE=filename.jks
MYAPP_RELEASE_KEY_ALIAS=your-key-alias
MYAPP_RELEASE_STORE_PASSWORD=your-store-password
MYAPP_RELEASE_KEY_PASSWORD=your-release-key-password

Now add the signingConfigs in build.gradle file as below:

signingConfigs{
    release {
        if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
            storeFile file(MYAPP_RELEASE_STORE_FILE)
            storePassword MYAPP_RELEASE_STORE_PASSWORD
            keyAlias MYAPP_RELEASE_KEY_ALIAS
            keyPassword MYAPP_RELEASE_KEY_PASSWORD
        }
    }
}

buildTypes {
    release {
        signingConfig signingConfigs.release
    }
}

Now you can sing your using your existing jks file.

answered Jul 12, 2019 at 7:17

Rutvik Bhatt

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6 Comments

Girma Over a year ago

My certificate's file type is FILE how can I convert it to jks ?

Rutvik Bhatt Over a year ago

just add yourfilename.jks and try to build it will work.

Rutvik Bhatt Over a year ago

You can check the certificate details after apk signed using this command : unzip -p Name-of-apk.apk META-INF/CERT.RSA | keytool -printcert

Girma Over a year ago

I've followed all the steps but I could not find the release folder (ie. no generated apk) at ...\android\app\build\outputs\apk

Rutvik Bhatt Over a year ago

@GirmaFeyissa is your build successful?

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Mohamed Jakkariya · Accepted Answer · 2021-04-05 07:04:54Z

2

One thing missed from the accepted answer.

How to fetch the existing Keystore file from the expo?

expo fetch:android:keystore

I need to know this so hopefully, it'll help someone.

answered Apr 5, 2021 at 7:04

Mohamed Jakkariya

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