dalvik - Why command line dalvikvm uses standard Java security libraries (keystore) instead of using the Android version

Question

I am performing an experiment: using Android keystore in a command-line Java application. I have an Activity hello world example of the keystore:
https://github.com/phanirajabhandari/android-keystore-example

I have just converted private method getKeyStore() in EncryptionUtils and added a single line on MainActivity, to print the getKeyStore(). The MainActivity is as follows:

public class MainActivity extends AppCompatActivity {

  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Timber.plant(new Timber.DebugTree());

    String value = "Password/Token to be encrypted";

    String encryptedValue = EncryptionUtils.encrypt(this, value);
    Timber.d(" Encrypted Value :" + encryptedValue);

    String decryptedValue = EncryptionUtils.decrypt(this, encryptedValue);
    Timber.d(" Decrypted Value :" + decryptedValue);
    
    Timber.d("Keystore:" + EncryptionUtils.getKeyStore());
  }
}

getKeyStore() method simply returns the Android Keystore:

  public static KeyStore getKeyStore() {
    KeyStore keyStore = null;
    try {
      keyStore = KeyStore.getInstance(EncryptionKeyGenerator.ANDROID_KEY_STORE);
      keyStore.load(null);
      //FileOutputStream fos = new FileOutputStream("/data/data/com.example.keystore/mykeystore");
      //keyStore.store(fos, "".toCharArray());
    } catch (KeyStoreException | CertificateException | NoSuchAlgorithmException | IOException e) {
      Timber.e(e);
    }
    return keyStore;
  }

I build the apk by using Android Studio and the Gradle provided by the project, and on the logs I can see that Keystore object is properly created:

2021-01-09 10:51:53.246 4103-4103/com.example.keystore D/MainActivity:  Encrypted Value :fH92kpVlBIRTVF3SnTiSZejZtDRa0H2uj1Ze2kXJ8Obt9OEO5_Qd0RNVlAkK8Q==
2021-01-09 10:51:53.272 4103-4103/com.example.keystore D/MainActivity:  Decrypted Value :Password/Token to be encrypted
2021-01-09 10:51:53.275 4103-4103/com.example.keystore D/MainActivity: Keystore:java.security.KeyStore@afbdfae

Now I am trying to following experiment:

1. Create a MainExample.java class:

package com.example.keystore;

public class MainExample {
    public static void main(String[] args) {
       System.out.println("Hello") ;
        System.out.println(EncryptionUtils.getKeyStore()) ;
    }
}

2. build and upload apk in android emulator (genymotion, root access):

adb push app-debug.apk /data/local/tmp/   

3. Execute the main hello world by using dalvikvm

dalvikvm -cp app-debug.apk com.example.keystore.MainExample                       <
Hello
java.security.KeyStoreException: AndroidKeyStore not found
        at java.security.KeyStore.getInstance(KeyStore.java:890)
        at com.example.keystore.EncryptionUtils.getKeyStore(EncryptionUtils.java:40)
        at com.example.keystore.MainExample.main(MainExample.java:6)
Caused by: java.security.NoSuchAlgorithmException: AndroidKeyStore KeyStore not available
        at sun.security.jca.GetInstance.getInstance(GetInstance.java:159)
        at java.security.Security.getImpl(Security.java:628)
        at java.security.KeyStore.getInstance(KeyStore.java:887)
        ... 2 more
null  

It seems that AndroidKeyStore is not seen by dalvikvm, as if dalvikvm is not using Android "java.security" package but official Java package. Why dalvikvm command-line execution is different by the Activity execution? Thank you in advance.

question from:https://stackoverflow.com/questions/65647990/why-command-line-dalvikvm-uses-standard-java-security-libraries-keystore-inste

Answer 1

Waitting for answers