dnssec.py 文件源码

def _find_candidate_keys(keys, rrsig):
    candidate_keys = []
    value = keys.get(rrsig.signer)
    if value is None:
        return None
    if isinstance(value, dns.node.Node):
        try:
            rdataset = value.find_rdataset(dns.rdataclass.IN,
                                           dns.rdatatype.DNSKEY)
        except KeyError:
            return None
    else:
        rdataset = value
    for rdata in rdataset:
        if rdata.algorithm == rrsig.algorithm and \
                key_id(rdata) == rrsig.key_tag:
            candidate_keys.append(rdata)
    return candidate_keys