public int authenticate(AuthenticationProtocolServer authentication,
    SshMsgUserAuthRequest msg) throws IOException 
{
 //, Map nativeSettings)
        NativeAuthenticationProvider authImpl = NativeAuthenticationProvider.getInstance();
        if (authImpl == null) {
            log.error(
                "Cannot perfrom authentication witout native authentication provider");
            return AuthenticationProtocolState.FAILED;
        }
        authentication.registerMessage(SshMsgUserAuthInfoResponse.SSH_MSG_USERAUTH_INFO_RESPONSE,
            SshMsgUserAuthInfoResponse.class);
        SshMsgUserAuthInfoRequest info = new SshMsgUserAuthInfoRequest("Password authentication",
                "", "");
        info.addPrompt(msg.getUsername() + "'s password", false);
        authentication.sendMessage(info);
        SshMessage response = authentication.readMessage();
        if (response instanceof SshMsgUserAuthInfoResponse) {
            String[] responses = ((SshMsgUserAuthInfoResponse) response).getResponses();
            if (responses.length == 1) {
                String password = responses[0];
                try {
                    if (authImpl.logonUser(msg.getUsername(), password)) { //, nativeSettings)) {
                        log.info(msg.getUsername() +
                            " has passed password authentication");
                        return AuthenticationProtocolState.COMPLETE;
                    } else {
                        log.info(msg.getUsername() +
                            " has failed password authentication");
                        return AuthenticationProtocolState.FAILED;
                    }
                } catch (PasswordChangeException ex) {
                    info = new SshMsgUserAuthInfoRequest("Password change required",
                            "", "");
                    info.addPrompt("New password", false);
                    info.addPrompt("Confirm password", false);
                    authentication.sendMessage(info);
                    response = authentication.readMessage();
                    if (response instanceof SshMsgUserAuthInfoResponse) {
                        responses = ((SshMsgUserAuthInfoResponse) response).getResponses();
                        if (responses.length == 2) {
                            if (responses[0].equals(responses[1])) {
                                if (authImpl.changePassword(msg.getUsername(),
                                            password, responses[0])) {
                                    return AuthenticationProtocolState.COMPLETE;
                                } else {
                                    return AuthenticationProtocolState.FAILED;
                                }
                            } else {
                                return AuthenticationProtocolState.FAILED;
                            }
                        } else {
                            log.error("Client replied with an invalid message " +
                                response.getMessageName());
                            return AuthenticationProtocolState.FAILED;
                        }
                    } else {
                        log.error("Client replied with an invalid message " +
                            response.getMessageName());
                        return AuthenticationProtocolState.FAILED;
                    }
                }
            } else {
                log.error("Client responded with too many values!");
                return AuthenticationProtocolState.FAILED;
            }
        } else {
            log.error("Client replied with an invalid message " +
                response.getMessageName());
            return AuthenticationProtocolState.FAILED;
        }
}

 public final String getMethodName() 
{
      
        return "keyboard-interactive";
}

 public  void setAuthenticatedTokens(Map tokens) 
{

}