Android Platform Support

[jruesga]

The implementation relies on Jni to access the Android KeyStore and obtain a list of trusted certificates. The code:

• Obtains and attach a previous created JVM instance.
• Uses JNI calls to access java.lang.Keystore and get the list of trusted certificates

KeyStore ks = KeyStore.getInstance("AndroidCAStore");
ks.load(null);
Enumeration<String> enumeration = ks.aliases();
while (enumeration.hasMoreElements()) {
    Certificate certificate = enumeration.nextElement();
    byte[] der = certificate.getEncoded();
}

• Maps any der certificate and errors to a CertificateResult.

Related to #3

There are GitHub Actions Android worflows included (both passing https://github.com/jruesga/rustls-native-certs/actions):

• rustls: it compiles the code for each Android ABI
• smoke-test: runs Android instrumentation tests for compare_mozilla.rs and smoketests.rs.

[djc]

Is there a reason you can't use the rustls-platform-verifier crate? It is currently the preferred way, see the current README.

[jruesga]

No. I read the README and understood that rustls-platform-verifier is the preferred way on wards. Just wanted to contribute it.

[djc]

So why do you want to contribute it? Does rustls-platform-verifier not work for your use case?

[jruesga]

yes, it does. Just learning new stuff. You can close the pull request. I understand that rustls-platform-verifier is the path forward.