return this.mechContext.isPreferredMech(mech);
    }


    @Override
    public byte[] calculateMIC ( byte[] data ) throws CIFSException {
        if ( !this.completed ) {
            throw new CIFSException("Context is not established");
        }
        return this.mechContext.calculateMIC(data);
    }


    /**
     * {@inheritDoc}
     *

        return true;
    }


    /**
     * {@inheritDoc}
     * 
     * @throws CIFSException
     *
     * @see jcifs.smb.SSPContext#calculateMIC(byte[])
     */
    @Override
    public byte[] calculateMIC ( byte[] data ) throws CIFSException {
        try {
            return this.gssContext.getMIC(data, 0, data.length, new MessageProp(false));
        }

    }


    @Override
    public boolean isMICAvailable () {
        return !this.auth.isGuest() && this.signKey != null && this.verifyKey != null;
    }


    @Override
    public byte[] calculateMIC ( byte[] data ) throws CIFSException {
        byte[] sk = this.signKey;
        if ( sk == null ) {
            throw new CIFSException("Signing is not initialized");
        }