Validate and parse DNS record data for TLSA record(s)
    :param rdata: DNS record data
    :return: dict w/fields

def sshfp_rec(rdata):
    '''
    Validate and parse DNS record data for TLSA record(s)
    :param rdata: DNS record data
    :return: dict w/fields
    '''
    rschema = OrderedDict((
        ('algorithm', RFC.SSHFP_ALGO),
        ('fp_hash', RFC.SSHFP_HASH),
        ('fingerprint', lambda val: val.lower())  # resolvers are inconsistent on this one
    ))

    return _data2rec(rschema, rdata)