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?? __init__.py(1.62 KB)
?? __pycache__
?? _asyncbackend.py(2.34 KB)
?? _asyncio_backend.py(8.84 KB)
?? _ddr.py(5.12 KB)
?? _features.py(2.43 KB)
?? _immutable_ctx.py(2.4 KB)
?? _trio_backend.py(8.27 KB)
?? asyncbackend.py(2.73 KB)
?? asyncquery.py(30.1 KB)
?? asyncresolver.py(17.43 KB)
?? dnssec.py(40.74 KB)
?? dnssecalgs
?? dnssectypes.py(1.76 KB)
?? e164.py(3.88 KB)
?? edns.py(16.69 KB)
?? entropy.py(4.14 KB)
?? enum.py(3.6 KB)
?? exception.py(5.81 KB)
?? flags.py(2.69 KB)
?? grange.py(2.09 KB)
?? immutable.py(1.97 KB)
?? inet.py(5.64 KB)
?? ipv4.py(2.49 KB)
?? ipv6.py(6.4 KB)
?? message.py(66.59 KB)
?? name.py(41.78 KB)
?? namedict.py(3.91 KB)
?? nameserver.py(9.88 KB)
?? node.py(12.37 KB)
?? opcode.py(2.67 KB)
?? py.typed(0 B)
?? query.py(54.98 KB)
?? quic
?? rcode.py(4.06 KB)
?? rdata.py(30.29 KB)
?? rdataclass.py(2.91 KB)
?? rdataset.py(16.27 KB)
?? rdatatype.py(7.27 KB)
?? rdtypes
?? renderer.py(10.99 KB)
?? resolver.py(72 KB)
?? reversename.py(3.74 KB)
?? rrset.py(8.96 KB)
?? serial.py(3.52 KB)
?? set.py(9 KB)
?? tokenizer.py(23.03 KB)
?? transaction.py(22.06 KB)
?? tsig.py(11.15 KB)
?? tsigkeyring.py(2.57 KB)
?? ttl.py(2.91 KB)
?? update.py(11.96 KB)
?? version.py(1.88 KB)
?? versioned.py(11.49 KB)
?? win32util.py(8.67 KB)
?? wire.py(2.76 KB)
?? xfr.py(12.96 KB)
?? zone.py(50.87 KB)
?? zonefile.py(27.27 KB)
?? zonetypes.py(690 B)

Editing: entropy.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

# Copyright (C) 2009-2017 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import hashlib
import os
import random
import threading
import time
from typing import Any, Optional

class EntropyPool:
    # This is an entropy pool for Python implementations that do not
    # have a working SystemRandom.  I'm not sure there are any, but
    # leaving this code doesn't hurt anything as the library code
    # is used if present.

def __init__(self, seed: Optional[bytes] = None):
        self.pool_index = 0
        self.digest: Optional[bytearray] = None
        self.next_byte = 0
        self.lock = threading.Lock()
        self.hash = hashlib.sha1()
        self.hash_len = 20
        self.pool = bytearray(b"\0" * self.hash_len)
        if seed is not None:
            self._stir(seed)
            self.seeded = True
            self.seed_pid = os.getpid()
        else:
            self.seeded = False
            self.seed_pid = 0

def _stir(self, entropy: bytes) -> None:
        for c in entropy:
            if self.pool_index == self.hash_len:
                self.pool_index = 0
            b = c & 0xFF
            self.pool[self.pool_index] ^= b
            self.pool_index += 1

def stir(self, entropy: bytes) -> None:
        with self.lock:
            self._stir(entropy)

def _maybe_seed(self) -> None:
        if not self.seeded or self.seed_pid != os.getpid():
            try:
                seed = os.urandom(16)
            except Exception:  # pragma: no cover
                try:
                    with open("/dev/urandom", "rb", 0) as r:
                        seed = r.read(16)
                except Exception:
                    seed = str(time.time()).encode()
            self.seeded = True
            self.seed_pid = os.getpid()
            self.digest = None
            seed = bytearray(seed)
            self._stir(seed)

def random_8(self) -> int:
        with self.lock:
            self._maybe_seed()
            if self.digest is None or self.next_byte == self.hash_len:
                self.hash.update(bytes(self.pool))
                self.digest = bytearray(self.hash.digest())
                self._stir(self.digest)
                self.next_byte = 0
            value = self.digest[self.next_byte]
            self.next_byte += 1
        return value

def random_16(self) -> int:
        return self.random_8() * 256 + self.random_8()

def random_32(self) -> int:
        return self.random_16() * 65536 + self.random_16()

def random_between(self, first: int, last: int) -> int:
        size = last - first + 1
        if size > 4294967296:
            raise ValueError("too big")
        if size > 65536:
            rand = self.random_32
            max = 4294967295
        elif size > 256:
            rand = self.random_16
            max = 65535
        else:
            rand = self.random_8
            max = 255
        return first + size * rand() // (max + 1)

pool = EntropyPool()

system_random: Optional[Any]
try:
    system_random = random.SystemRandom()
except Exception:  # pragma: no cover
    system_random = None

def random_16() -> int:
    if system_random is not None:
        return system_random.randrange(0, 65536)
    else:
        return pool.random_16()

def between(first: int, last: int) -> int:
    if system_random is not None:
        return system_random.randrange(first, last + 1)
    else:
        return pool.random_between(first, last)

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Editing: entropy.py

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