def guess_contains_nss(lines):
    """Tries to determine if a file includes libnss
    """
    signatures = [
        'Client authentication failed: private key in key database does not match public key in certificate database.'
        ,
        'The next protocol negotiation extension was enabled, but the callback was cleared prior to being needed.'
        , '# SSL/TLS secrets log file, generated by NSS', 'Header: NSS ',
        'Version: NSS ']
    for line in lines:
        for signature in signatures:
            if signature in line:
                return 1
    return 0
