Hacked By AnonymousFox

from typing import Dict, Optional, Tuple, Type, Union

import dns.name
from dns.dnssecalgs.base import GenericPrivateKey
from dns.dnssectypes import Algorithm
from dns.exception import UnsupportedAlgorithm
from dns.rdtypes.ANY.DNSKEY import DNSKEY

if dns._features.have("dnssec"):
    from dns.dnssecalgs.dsa import PrivateDSA, PrivateDSANSEC3SHA1
    from dns.dnssecalgs.ecdsa import PrivateECDSAP256SHA256, PrivateECDSAP384SHA384
    from dns.dnssecalgs.eddsa import PrivateED448, PrivateED25519
    from dns.dnssecalgs.rsa import (
        PrivateRSAMD5,
        PrivateRSASHA1,
        PrivateRSASHA1NSEC3SHA1,
        PrivateRSASHA256,
        PrivateRSASHA512,
    )

    _have_cryptography = True
else:
    _have_cryptography = False

AlgorithmPrefix = Optional[Union[bytes, dns.name.Name]]

algorithms: Dict[Tuple[Algorithm, AlgorithmPrefix], Type[GenericPrivateKey]] = {}
if _have_cryptography:
    algorithms.update(
        {
            (Algorithm.RSAMD5, None): PrivateRSAMD5,
            (Algorithm.DSA, None): PrivateDSA,
            (Algorithm.RSASHA1, None): PrivateRSASHA1,
            (Algorithm.DSANSEC3SHA1, None): PrivateDSANSEC3SHA1,
            (Algorithm.RSASHA1NSEC3SHA1, None): PrivateRSASHA1NSEC3SHA1,
            (Algorithm.RSASHA256, None): PrivateRSASHA256,
            (Algorithm.RSASHA512, None): PrivateRSASHA512,
            (Algorithm.ECDSAP256SHA256, None): PrivateECDSAP256SHA256,
            (Algorithm.ECDSAP384SHA384, None): PrivateECDSAP384SHA384,
            (Algorithm.ED25519, None): PrivateED25519,
            (Algorithm.ED448, None): PrivateED448,
        }
    )


def get_algorithm_cls(
    algorithm: Union[int, str], prefix: AlgorithmPrefix = None
) -> Type[GenericPrivateKey]:
    """Get Private Key class from Algorithm.

    *algorithm*, a ``str`` or ``int`` specifying the DNSKEY algorithm.

    Raises ``UnsupportedAlgorithm`` if the algorithm is unknown.

    Returns a ``dns.dnssecalgs.GenericPrivateKey``
    """
    algorithm = Algorithm.make(algorithm)
    cls = algorithms.get((algorithm, prefix))
    if cls:
        return cls
    raise UnsupportedAlgorithm(
        'algorithm "%s" not supported by dnspython' % Algorithm.to_text(algorithm)
    )


def get_algorithm_cls_from_dnskey(dnskey: DNSKEY) -> Type[GenericPrivateKey]:
    """Get Private Key class from DNSKEY.

    *dnskey*, a ``DNSKEY`` to get Algorithm class for.

    Raises ``UnsupportedAlgorithm`` if the algorithm is unknown.

    Returns a ``dns.dnssecalgs.GenericPrivateKey``
    """
    prefix: AlgorithmPrefix = None
    if dnskey.algorithm == Algorithm.PRIVATEDNS:
        prefix, _ = dns.name.from_wire(dnskey.key, 0)
    elif dnskey.algorithm == Algorithm.PRIVATEOID:
        length = int(dnskey.key[0])
        prefix = dnskey.key[0 : length + 1]
    return get_algorithm_cls(dnskey.algorithm, prefix)


def register_algorithm_cls(
    algorithm: Union[int, str],
    algorithm_cls: Type[GenericPrivateKey],
    name: Optional[Union[dns.name.Name, str]] = None,
    oid: Optional[bytes] = None,
) -> None:
    """Register Algorithm Private Key class.

    *algorithm*, a ``str`` or ``int`` specifying the DNSKEY algorithm.

    *algorithm_cls*: A `GenericPrivateKey` class.

    *name*, an optional ``dns.name.Name`` or ``str``, for for PRIVATEDNS algorithms.

    *oid*: an optional BER-encoded `bytes` for PRIVATEOID algorithms.

    Raises ``ValueError`` if a name or oid is specified incorrectly.
    """
    if not issubclass(algorithm_cls, GenericPrivateKey):
        raise TypeError("Invalid algorithm class")
    algorithm = Algorithm.make(algorithm)
    prefix: AlgorithmPrefix = None
    if algorithm == Algorithm.PRIVATEDNS:
        if name is None:
            raise ValueError("Name required for PRIVATEDNS algorithms")
        if isinstance(name, str):
            name = dns.name.from_text(name)
        prefix = name
    elif algorithm == Algorithm.PRIVATEOID:
        if oid is None:
            raise ValueError("OID required for PRIVATEOID algorithms")
        prefix = bytes([len(oid)]) + oid
    elif name:
        raise ValueError("Name only supported for PRIVATEDNS algorithm")
    elif oid:
        raise ValueError("OID only supported for PRIVATEOID algorithm")
    algorithms[(algorithm, prefix)] = algorithm_cls