403Webshell
Server IP : 80.241.246.6  /  Your IP : 216.73.216.129
Web Server : Apache/2.4.25 (Debian)
System : Linux kharagauli 4.9.0-19-amd64 #1 SMP Debian 4.9.320-2 (2022-06-30) x86_64
User : www-data ( 33)
PHP Version : 7.0.33-0+deb9u12
Disable Function : pcntl_alarm,pcntl_fork,pcntl_waitpid,pcntl_wait,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_exec,pcntl_getpriority,pcntl_setpriority,
MySQL : OFF  |  cURL : ON  |  WGET : ON  |  Perl : ON  |  Python : ON  |  Sudo : ON  |  Pkexec : ON
Directory :  /usr/lib/python3/dist-packages/cryptography/hazmat/primitives/kdf/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :


[ Back ]     

Current File : /usr/lib/python3/dist-packages/cryptography/hazmat/primitives/kdf/x963kdf.py
# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

import struct

from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons
)
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import constant_time, hashes
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction


def _int_to_u32be(n):
    return struct.pack('>I', n)


@utils.register_interface(KeyDerivationFunction)
class X963KDF(object):
    def __init__(self, algorithm, length, sharedinfo, backend):

        max_len = algorithm.digest_size * (2 ** 32 - 1)
        if length > max_len:
            raise ValueError(
                "Can not derive keys larger than {0} bits.".format(max_len))
        if not (sharedinfo is None or isinstance(sharedinfo, bytes)):
            raise TypeError("sharedinfo must be bytes.")
        self._algorithm = algorithm
        self._length = length
        self._sharedinfo = sharedinfo

        if not isinstance(backend, HashBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement HashBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE
            )
        self._backend = backend
        self._used = False

    def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

    def verify(self, key_material, expected_key):
        if not constant_time.bytes_eq(self.derive(key_material), expected_key):
            raise InvalidKey

Youez - 2016 - github.com/yon3zu
LinuXploit