Hi all,
i am using the Java Client SDK in an android app. its a simple browser which also can subscribe to sensor values.
my problem is that as soon as i want to establish a connection using a security mode other then .NONE it throws a ClassCastExeption.

More specific:
java.lang.ClassCastException: com.android.org.conscrypt.OpenSSLRSAPrivateKey cannot be cast to java.security.interfaces.RSAPrivateCrtKey

What am i missing? Looking forward to hearing from you. Thanks

Responsibe Code:
ApplicationDescription appDescription = new ApplicationDescription();

appDescription.setApplicationName(new LocalizedText(“AndroidOpcuaBrowser”,
Locale.ENGLISH));

String android_id = Settings.Secure.getString(
mContext.getContentResolver(),
Settings.Secure.ANDROID_ID);

appDescription.setApplicationUri(“urn:” + android_id + “:UA:AndroidOpcuaBrowser”);
appDescription.setProductUri(“urn:hahnschickard.de:UA:AndroidOpcuaBrowser”);
appDescription.setApplicationType(ApplicationType.Client);

PkiFileBasedCertificateValidator validator = new PkiFileBasedCertificateValidator(
mContext.getFilesDir().getPath() + “/PKI/CA”);

Log.d(“PkiPath”, mContext.getFilesDir().getPath() + “/PKI/CA”);

validator.setValidationListener(new CertificateValidationListener() {
@Override
public PkiFileBasedCertificateValidator.ValidationResult onValidate(
Cert cert, ApplicationDescription applicationDescription,
EnumSet enumSet) {

return PkiFileBasedCertificateValidator.ValidationResult.AcceptPermanently;
}
});
mClient.setCertificateValidator(validator);

ApplicationIdentity identity = ApplicationIdentity
.loadOrCreateCertificate(appDescription, “Sample Organisation”,
/* Private Key Password */”opcua”,
/* Key File Path */new File(validator.getBaseDir(), “private”),
/* Enable renewing the certificate */ true);

identity.setApplicationDescription(appDescription);
mClient.setApplicationIdentity(identity);

mClient.setTimeout(60000);
mClient.setSecurityMode(SecurityMode.BASIC128RSA15_SIGN);
mClient.setUserIdentity(new UserIdentity());
mClient.connect();

Log:
E/AndroidRuntime: FATAL EXCEPTION: Thread-5
Process: de.hahn_schickard.opcuaexplorer, PID: 1640
java.lang.ClassCastException: com.android.org.conscrypt.OpenSSLRSAPrivateKey cannot be cast to java.security.interfaces.RSAPrivateCrtKey
at org.opcfoundation.ua.transport.security.ScCryptoProvider.signAsymm(Unknown Source)
at org.opcfoundation.ua.transport.tcp.impl.ChunkAsymmEncryptSigner.sign(Unknown Source)
at org.opcfoundation.ua.transport.tcp.impl.ChunkAsymmEncryptSigner.run(Unknown Source)
at org.opcfoundation.ua.transport.tcp.io.TcpConnection.sendAsymmChunk(Unknown Source)
at org.opcfoundation.ua.transport.tcp.io.TcpConnection.sendRequest(Unknown Source)
at org.opcfoundation.ua.transport.tcp.io.SecureChannelTcp.createSecureChannel(Unknown Source)
at org.opcfoundation.ua.transport.tcp.io.SecureChannelTcp.open(Unknown Source)
at org.opcfoundation.ua.application.Client.createSecureChannel(Unknown Source)
at com.prosysopc.ua.client.UaClient.m(Unknown Source)
at com.prosysopc.ua.client.UaClient.connect(Unknown Source)
at de.hahn_schickard.opcuaexplorer.OPCUAService$ConnectThread.run(OPCUAService.java:421)