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__init__.py

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

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-03-24 03:58:34
..	dir	-	root/root	0755	2025-03-24 03:58:34
__pycache__	dir	-	root/root	0755	2025-03-24 03:58:34
__init__.py	file	4.18 KB	root/root	0644	2024-02-18 06:35:12
base.py	file	2.39 KB	root/root	0644	2024-02-18 06:35:12
cryptography.py	file	2.37 KB	root/root	0644	2024-02-18 06:35:12
dsa.py	file	3.42 KB	root/root	0644	2024-02-18 06:35:12
ecdsa.py	file	2.95 KB	root/root	0644	2024-02-18 06:35:12
eddsa.py	file	1.87 KB	root/root	0644	2024-02-18 06:35:12
rsa.py	file	3.47 KB	root/root	0644	2024-02-18 06:35:12