/**
* Returns the {@code PrivateKey} for the requested alias, or null if no there is no result.
*
* <p>This method may block while waiting for a connection to another process, and must never be
* called from the main thread.
*
* @param alias The alias of the desired private key, typically returned via {@link
* KeyChainAliasCallback#alias}.
* @throws KeyChainException if the alias was valid but there was some problem accessing it.
* @throws IllegalStateException if called from the main thread.
*/
@Nullable
@WorkerThread
public static PrivateKey getPrivateKey(@NonNull Context context, @NonNull String alias)
throws KeyChainException, InterruptedException {
if (alias == null) {
throw new NullPointerException("alias == null");
}
KeyChainConnection keyChainConnection = bind(context);
try {
final IKeyChainService keyChainService = keyChainConnection.getService();
final String keyId = keyChainService.requestPrivateKey(alias);
if (keyId == null) {
throw new KeyChainException("keystore had a problem");
}
return AndroidKeyStoreProvider.loadAndroidKeyStorePrivateKeyFromKeystore(
KeyStore.getInstance(), keyId);
} catch (RemoteException e) {
throw new KeyChainException(e);
} catch (RuntimeException e) {
// only certain RuntimeExceptions can be propagated across the IKeyChainService call
throw new KeyChainException(e);
} catch (UnrecoverableKeyException e) {
throw new KeyChainException(e);
} finally {
keyChainConnection.close();
}
}
