Android keystore corrupted

Question

After a while of not updating my applications in the Play Store I tried to sign one of my APK with my keystore, only to find that the keystore and alias password doesn't work anymore. The keystore password I was able to reset using this gist: gist.github.com/zach-klippenstein/4631307 and works fine now. This happens for two different keystores for two different applications.

Running keytool -list -keystore mykeystore resulted in:

Keystore type: JKS Keystore provider: SUN  Your keystore contains 1 entry  myalias, Dec 23, 2014, PrivateKeyEntry,  Certificate fingerprint (SHA1): 85:8F:69...... 

I am 100% sure that the alias password is the same as the keystore password, but it doesn't seem to work. I've tried signing the APK in Android Studio and with jarsigner -keystore mykeystore -storepass mykeystorepassword app-debug.apk myalias but the response is always: jarsigner: unable to recover key from keystore.

I tried moving the alias to a new keystore file with keytool -importkeystore -srckeystore mykeystore -destkeystore newkeystore -srcalias myalias it then asks me to enter new password for the new keystore and the password for the old keystore (both work), only after entering the alias password I get an exception:

Enter destination keystore password:   Re-enter new password:  Enter source keystore password:   Enter key password for <myalias> keytool error: java.security.UnrecoverableKeyException: Cannot recover key 

After some Googling I found that for some people the keystore stopped working after updating to another JDK version or Android Studio version, so I am wondering if that is the case for me also. The keystore was created in 2014 so I was probably on JDK7 at the time (I am now at 8). It is also suspicious two keystores mysteriously stop working..

Can this be fixed somehow?

EDIT:

I tried the solution from Jan and got the following results:

keytool -importkeystore -srckeystore mykeystore -destkeystore newkeystore -deststoretype pkcs12 gives me the same exception: keytool error: java.security.UnrecoverableKeyException: Cannot recover key.

After running this command: keytool -importkeystore -srckeystore newkeystore -srcstoretype pkcs12 -destkeystore finalkeystore -deststoretype jks I get this error: keytool error: java.io.IOException: DerInputStream.getLength(): lengthTag=109, too big.

SECOND EDIT:

I also tried signing the apk on a PC with JDK7, no luck.

THIRD EDIT:

I tried using the KeyStore Explorer and it opens the keystore file just fine and shows one entry (not expired). When I try to open the private key I get the same exception. Stacktrace:

java.security.UnrecoverableKeyException: Cannot recover key at sun.security.provider.KeyProtector.recover(KeyProtector.java:328) at sun.security.provider.JavaKeyStore.engineGetKey(JavaKeyStore.java:146) at sun.security.provider.JavaKeyStore$JKS.engineGetKey(JavaKeyStore.java:56) at sun.security.provider.KeyStoreDelegator.engineGetKey(KeyStoreDelegator.java:96) at sun.security.provider.JavaKeyStore$DualFormatJKS.engineGetKey(JavaKeyStore.java:70) at java.security.KeyStore.getKey(KeyStore.java:1023) at net.sf.keystore_explorer.gui.actions.KeyStoreExplorerAction.unlockEntry(KeyStoreExplorerAction.java:154) at net.sf.keystore_explorer.gui.actions.KeyStoreExplorerAction.getEntryPassword(KeyStoreExplorerAction.java:123) at net.sf.keystore_explorer.gui.actions.KeyPairPrivateKeyDetailsAction.doAction(KeyPairPrivateKeyDetailsAction.java:69) at net.sf.keystore_explorer.gui.actions.KeyStoreExplorerAction.actionPerformed(KeyStoreExplorerAction.java:93) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.AbstractButton.doClick(AbstractButton.java:376) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877) at java.awt.Component.processMouseEvent(Component.java:6535) at javax.swing.JComponent.processMouseEvent(JComponent.java:3324) at java.awt.Component.processEvent(Component.java:6300) at java.awt.Container.processEvent(Container.java:2236) at java.awt.Component.dispatchEventImpl(Component.java:4891) at java.awt.Container.dispatchEventImpl(Container.java:2294) at java.awt.Component.dispatchEvent(Component.java:4713) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466) at java.awt.Container.dispatchEventImpl(Container.java:2280) at java.awt.Window.dispatchEventImpl(Window.java:2750) at java.awt.Component.dispatchEvent(Component.java:4713) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.awt.EventQueue$4.run(EventQueue.java:729) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:728) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) 

Answer 1

Try

keytool -importkeystore -srckeystore old.keystore -destkeystore new.keystore -deststoretype pkcs12 

and

keytool -importkeystore -srckeystore new.keystore -srcstoretype pkcs12 -destkeystore final.keystore -deststoretype jks 

as suggested in this question.