在 Google Play 商店中，我已经有一段时间没有更新我的应用程序。最近我尝试使用我的密钥库中的别名签署 APK，但是却发现密钥库和别名密码不再有效。通过这个 gist: gist.github.com/zach-klippenstein/4631307 我已经成功重新设置了密钥库密码，并且现在可以正常工作。两个不同的应用程序需要使用两个不同的密钥库。
运行keytool -list -keystore mykeystore 的结果如下：
Keystore type: JKS
Keystore provider: SUN
Your keystore contains 1 entry
myalias, Dec 23, 2014, PrivateKeyEntry,
Certificate fingerprint (SHA1): 85:8F:69......
我百分之百确定别名密码和密钥库密码相同，但好像不起作用。我已经尝试在Android Studio中签署APK和使用 jarsigner -keystore mykeystore -storepass mykeystorepassword app-debug.apk myalias 进行签名，但响应始终为：jarsigner: unable to recover key from keystore。
我尝试将别名移动到一个新的密钥库文件中，使用 keytool -importkeystore -srckeystore mykeystore -destkeystore newkeystore -srcalias myalias，然后要求我输入新的密钥库密码和旧的密钥库密码（两个都有效），但只有在输入别名密码后我才会得到一个异常：
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
经过一些谷歌搜索，我发现对于一些人来说，在更新到另一个JDK版本或Android Studio版本后，密钥库停止工作，所以我想知道这是否也适用于我。密钥库是在2014年创建的，所以当时我可能使用的是JDK7（现在是8）。同样令人怀疑两个密钥库不可思议地停止工作...
有办法修复吗？
编辑：
我尝试了Jan的解决方案，得到了以下结果:
keytool -importkeystore -srckeystore mykeystore -destkeystore newkeystore -deststoretype pkcs12给我相同的异常：keytool error: java.security.UnrecoverableKeyException: Cannot recover key。
运行此命令后：keytool -importkeystore -srckeystore newkeystore -srcstoretype pkcs12 -destkeystore finalkeystore -deststoretype jks，我收到此错误：keytool error: java.io.IOException: DerInputStream.getLength(): lengthTag=109, too big.
第二次编辑：
我还尝试在装有JDK7的PC上签署apk程序包，但没有成功。
第三次编辑：
我尝试使用KeyStore Explorer打开密钥库文件，显示正常并显示一个条目（未过期）。当我尝试打开私钥时，出现相同的异常。堆栈跟踪：
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)