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      1 # Copyright (C) Internet Systems Consortium, Inc. ("ISC")
      2 #
      3 # SPDX-License-Identifier: MPL-2.0
      4 #
      5 # This Source Code Form is subject to the terms of the Mozilla Public
      6 # License, v. 2.0.  If a copy of the MPL was not distributed with this
      7 # file, you can obtain one at https://mozilla.org/MPL/2.0/.
      8 #
      9 # See the COPYRIGHT file distributed with this work for additional
     10 # information regarding copyright ownership.
     11 
     12 from typing import NamedTuple
     13 
     14 import os
     15 
     16 
     17 class Algorithm(NamedTuple):
     18     name: str
     19     number: int
     20     bits: int
     21 
     22     @classmethod
     23     def default(cls):
     24         return cls(
     25             os.environ["DEFAULT_ALGORITHM"],
     26             int(os.environ["DEFAULT_ALGORITHM_NUMBER"]),
     27             int(os.environ["DEFAULT_BITS"]),
     28         )
     29 
     30 
     31 RSASHA1 = Algorithm("RSASHA1", 5, 2048)
     32 NSEC3RSASHA1 = Algorithm("NSEC3RSASHA1", 7, 2048)
     33 RSASHA256 = Algorithm("RSASHA256", 8, 2048)
     34 RSASHA512 = Algorithm("RSASHA512", 10, 2048)
     35 ECDSAP256SHA256 = Algorithm("ECDSAP256SHA256", 13, 256)
     36 ECDSAP384SHA384 = Algorithm("ECDSAP384SHA384", 14, 384)
     37 ED25519 = Algorithm("ED25519", 15, 256)
     38 ED448 = Algorithm("ED448", 16, 456)
     39 
     40 ALL_ALGORITHMS = [
     41     RSASHA1,
     42     NSEC3RSASHA1,
     43     RSASHA256,
     44     RSASHA512,
     45     ECDSAP256SHA256,
     46     ECDSAP384SHA384,
     47     ED25519,
     48     ED448,
     49 ]
     50 
     51 ALL_ALGORITHMS_BY_NUM = {alg.number: alg for alg in ALL_ALGORITHMS}
     52