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Serialization and de-serialization of certain objects does not work as expected

See original GitHub issue

[READ] Step 1: Are you in the right place?

Issues filed here should be about bugs in the code in this repository. If you have a general question, need help debugging, or fall into some other category use one of these other channels:

For general technical questions, post a question on StackOverflow with the firebase tag.
For general Firebase discussion, use the firebase-talk google group.
For help troubleshooting your application that does not fall under one of the above categories, reach out to the personalized Firebase support channel.

[REQUIRED] Step 2: Describe your environment

Android Studio version: 4.1.3
Firebase Component: inappmessaging
Component version: 20.0.0

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

The problem java.lang.ClassNotFoundException: com.google.android.gms.org.conscrypt.OpenSSLRSAPrivateCrtKey at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:453) at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:628) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1615) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1520) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1776) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2002) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1926) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1803) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1353) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:373)

Without SDK of Firebase InApp Messaging (FIAM), de-serialization and serialization works as expected. Adding the firebase-inappmessaging-display dependency to the project, causes this completely separate part to throw an exception.

Relevant Code:

To generate RSA:

public static KeyPair generateRSAKeyPair() {
        KeyPairGenerator keyGen = null;
        KeyPair keyPair = null;
        try {
            keyGen = KeyPairGenerator.getInstance("RSA");
            keyGen.initialize(1024);
            keyPair = keyGen.genKeyPair();
        } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
            e.printStackTrace();
        }
        return keyPair;
    }

To serialize:

public static byte[] serializeClientKeyPair(KeyPair clientKeyPair) {
        ByteArrayOutputStream b = new ByteArrayOutputStream();
        ObjectOutputStream o;
        try {
            o = new ObjectOutputStream(b);
            o.writeObject(clientKeyPair);
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] res = b.toByteArray();
        return res;
    }

And to de-serialize:

public static KeyPair deserializeKeyPair(byte[] serializedKeyPair) {
        ByteArrayInputStream bi = new ByteArrayInputStream(serializedKeyPair);
        ObjectInputStream oi;
        Object obj = null;
        try {
            oi = new ObjectInputStream(bi);
            obj = oi.readObject();
        } catch (StreamCorruptedException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return ((KeyPair) obj);
    }

When including FIAM SDK to the project, with an Android >=9, exception is thrown at obj = oi.readObject(); when doing the steps:

                KeyPair keyPair = generateRSAKeyPair();
                byte[] serialized = serializeClientKeyPair(keyPair);
                KeyPair deserializedKeyPair = deserializeKeyPair(serialized);