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My application only targets Android 6.0+. In my application I generate a RSA key in the AndroidKeyStore with the following:
KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA", "AndroidKeyStore");
kpg.initialize(new KeyGenParameterSpec.Builder(
"myKey", KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT)
.setCertificateSubject(new X500Principal("CN=myKey"))
.setDigests("SHA-1")
.setEncryptionPaddings("OAEPPadding")
.build());
KeyPair kp = kpg.generateKeyPair();
This works well on 20+ devices that we have tested and nearly 100% percent of our users.
However, there is a small number of users that that application crashes for when kpg.generateKeyPair() is executed with the following:
java.security.ProviderException: Failed to load generated key pair from keystore
at android.security.keystore.AndroidKeyStoreKeyPairGeneratorSpi.loadKeystoreKeyPair(AndroidKeyStoreKeyPairGeneratorSpi.java:518)
at android.security.keystore.AndroidKeyStoreKeyPairGeneratorSpi.generateKeyPair(AndroidKeyStoreKeyPairGeneratorSpi.java:470)
at java.security.KeyPairGenerator$Delegate.generateKeyPair(KeyPairGenerator.java:699)
at md5fb78b69c5ddbc157f4db38fd738139a6.MainApplication.n_onCreate(Native Method)
at md5fb78b69c5ddbc157f4db38fd738139a6.MainApplication.onCreate(MainApplication.java:34)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1025)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5448)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1564)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6186)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
Caused by: java.security.UnrecoverableKeyException: Failed to obtain X.509 form of public key
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStorePublicKeyFromKeystore(AndroidKeyStoreProvider.java:230)
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStoreKeyPairFromKeystore(AndroidKeyStoreProvider.java:259)
at android.security.keystore.AndroidKeyStoreKeyPairGeneratorSpi.loadKeystoreKeyPair(AndroidKeyStoreKeyPairGeneratorSpi.java:509)
... 14 more
Caused by: android.security.KeyStoreException: -22
at android.security.KeyStore.getKeyStoreException(KeyStore.java:676)
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStorePublicKeyFromKeystore(AndroidKeyStoreProvider.java:231)
... 16 more
java.security.UnrecoverableKeyException: Failed to obtain X.509 form of public key
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStorePublicKeyFromKeystore(AndroidKeyStoreProvider.java:230)
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStoreKeyPairFromKeystore(AndroidKeyStoreProvider.java:259)
at android.security.keystore.AndroidKeyStoreKeyPairGeneratorSpi.loadKeystoreKeyPair(AndroidKeyStoreKeyPairGeneratorSpi.java:509)
at android.security.keystore.AndroidKeyStoreKeyPairGeneratorSpi.generateKeyPair(AndroidKeyStoreKeyPairGeneratorSpi.java:470)
at java.security.KeyPairGenerator$Delegate.generateKeyPair(KeyPairGenerator.java:699)
at md5fb78b69c5ddbc157f4db38fd738139a6.MainApplication.n_onCreate(Native Method)
at md5fb78b69c5ddbc157f4db38fd738139a6.MainApplication.onCreate(MainApplication.java:34)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1025)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5448)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1564)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6186)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
Caused by: android.security.KeyStoreException: -22
at android.security.KeyStore.getKeyStoreException(KeyStore.java:676)
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStorePublicKeyFromKeystore(AndroidKeyStoreProvider.java:231)
... 16 more
android.security.KeyStoreException: -22
at android.security.KeyStore.getKeyStoreException(KeyStore.java:676)
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStorePublicKeyFromKeystore(AndroidKeyStoreProvider.java:231)
at android.security.keystore.AndroidKeyStoreProvider.loadAndroidKeyStoreKeyPairFromKeystore(AndroidKeyStoreProvider.java:259)
at android.security.keystore.AndroidKeyStoreKeyPairGeneratorSpi.loadKeystoreKeyPair(AndroidKeyStoreKeyPairGeneratorSpi.java:509)
at android.security.keystore.AndroidKeyStoreKeyPairGeneratorSpi.generateKeyPair(AndroidKeyStoreKeyPairGeneratorSpi.java:470)
at java.security.KeyPairGenerator$Delegate.generateKeyPair(KeyPairGenerator.java:699)
at md5fb78b69c5ddbc157f4db38fd738139a6.MainApplication.n_onCreate(Native Method)
at md5fb78b69c5ddbc157f4db38fd738139a6.MainApplication.onCreate(MainApplication.java:34)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1025)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5448)
at android.app.ActivityThread.-wrap2(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1564)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6186)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:779)
The only things I can find on the internet about this Failed to obtain X.509 form of public key error are a few articles with no real solutions. See:
- https://github.com/AzureAD/azure-activedirectory-library-for-android/issues/740
- https://jira.lineageos.org/browse/BUGBASH-454
The few reports that we have received are from users with OnePlus devices on Android 7.1, which is also one of the devices mentioned in the above articles but there are definitely other devices affected as well.
- Why is this happening?
- Are there any workarounds?