u2f.md

U2F Session

The YKFU2FSession provides access to the U2F application on a YubiKey.

Communicating with the U2F application on the YubiKey

Communication with the U2F application is done through the YKFU2FSession and the methods it expose. You obtain the session by calling - (void)u2fSession:(YKFU2FSessionCallback _Nonnull)callback on a YKFConnectionProtocol. The method is guaranteed to either return the session or an error, never both nor neither.

Swift

connection.oathSession { session, error in
    guard let session = session else { /* Handle error */ return }
    session.listCredentials { credentials, error in
        // Do something with the array of credentials
    }
}

Objective-C

[connection oathSession:^(YKFOATHSession * _Nullable session, NSError * _Nullable error) {
    if (session == nil) { /* Handle error */ return; }
    [session listCredentialsWithCompletion:^(NSArray<YKFOATHCredential *> * _Nullable credentials, NSError * _Nullable error) {
        // Do something with the array of credentials
    }];
}];

Additional resources

Read more about U2F on the Yubico developer site.