public PacCredentialType ( byte[] data ) throws PACDecodingException {
        this.credentialType = data;
        if ( !isCredentialTypeCorrect() ) {
            throw new PACDecodingException("Invalid PAC credential type");
        }
    }


    public boolean isCredentialTypeCorrect () {
        return this.credentialType != null && this.credentialType.length < MINIMAL_BUFFER_SIZE;
    }