`java.io.IOException: Invalid keystore format`

[auroraanna]

When I build our Godot app with your CI for Android I get this:

...
ADDING: res/mipmap/icon_foreground.png
ADDING: resources.arsc
	export: step 1: Adding files...
	export: step 103: Aligning APK...
Starting signing of the APK binary using /usr/lib/android-sdk/build-tools/30.0.3/apksigner
	export: step 104: Signing release APK...
Failed to load signer "signer #1"
java.io.IOException: Invalid keystore format
	at sun.security.provider.JavaKeyStore.engineLoad(JavaKeyStore.java:666)
	at sun.security.provider.JavaKeyStore$JKS.engineLoad(JavaKeyStore.java:57)
	at sun.security.provider.KeyStoreDelegator.engineLoad(KeyStoreDelegator.java:224)
	at sun.security.provider.JavaKeyStore$DualFormatJKS.engineLoad(JavaKeyStore.java:71)
	at java.security.KeyStore.load(KeyStore.java:1445)
	at com.android.apksigner.SignerParams.loadKeyStoreFromFile(SignerParams.java:353)
	at com.android.apksigner.SignerParams.loadPrivateKeyAndCertsFromKeyStore(SignerParams.java:239)
	at com.android.apksigner.SignerParams.loadPrivateKeyAndCerts(SignerParams.java:181)
	at com.android.apksigner.ApkSignerTool.getSignerConfig(ApkSignerTool.java:395)
	at com.android.apksigner.ApkSignerTool.sign(ApkSignerTool.java:316)
	at com.android.apksigner.ApkSignerTool.main(ApkSignerTool.java:88)

export: end
ERROR: Project export failed with error code 20 for preset "Android".
   at: _fs_changed (editor/editor_node.cpp:801)
EditorSettings: Save OK!

I followed the steps in the documentation of the CI config to encode the key and all that. I verified multiple times now that the from base64 decoded key is exactly the same as the original non base64 key. I have no idea what this error means.

[myin142]

Did you generate the keystore with java 8? Apparently the version of the apksigner and the version used to generate the keystore has to match.

[auroraanna]

I did not use java 8 but java 11.

[auroraanna]

I'm not sure how to use Java 8 either.

[myin142]

I think you just have to set the environment variable JAVA_HOME to a different directory with java 8.

[auroraanna]

So I did export JAVA_HOME="/nix/store/6aj4vbk6hnbi7hv6lq98xyv6ikz3q45c-openjdk-8u272-b10-debug" and generated a new keystore with keytool but it's giving the same error,

[myin142]

My bad, it isn't just setting JAVA_HOME. You have to use the keytool scripts of the correct JDK to use a different version. So in your case it should be in /nix/store/6aj4vbk6hnbi7hv6lq98xyv6ikz3q45c-openjdk-8u272-b10-debug/bin/keytool.