}

        this.state++;
        return out;
    }


    protected void initSessionSecurity ( byte[] mk ) {
        this.signKey = deriveKey(mk, C2S_SIGN_CONSTANT);
        this.verifyKey = deriveKey(mk, S2C_SIGN_CONSTANT);

        if ( log.isDebugEnabled() ) {
            log.debug("Sign key is " + Hexdump.toHexString(this.signKey));