OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📄 __init__.py	771 bytes	11/30/2017 01:53:32 AM	rw-r--r--
📁 __pycache__	-	11/05/2020 06:02:51 AM	rwxr-xr-x
📄 concatkdf.py	4.01 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 hkdf.py	3.59 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 kbkdf.py	4.91 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 pbkdf2.py	2.13 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 scrypt.py	2.2 KB	11/30/2017 01:53:32 AM	rw-r--r--
📄 x963kdf.py	2.31 KB	11/30/2017 01:53:32 AM	rw-r--r--

Editing: concatkdf.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 HMACBackend
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import constant_time, hashes, hmac
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction

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

def _common_args_checks(algorithm, length, otherinfo):
    max_length = algorithm.digest_size * (2 ** 32 - 1)
    if length > max_length:
        raise ValueError(
            "Can not derive keys larger than {0} bits.".format(
                max_length
            ))
    if not (otherinfo is None or isinstance(otherinfo, bytes)):
        raise TypeError("otherinfo must be bytes.")

def _concatkdf_derive(key_material, length, auxfn, otherinfo):
    if not isinstance(key_material, bytes):
        raise TypeError("key_material must be bytes.")

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

while (length > outlen):
        h = auxfn()
        h.update(_int_to_u32be(counter))
        h.update(key_material)
        h.update(otherinfo)
        output.append(h.finalize())
        outlen += len(output[-1])
        counter += 1

return b"".join(output)[:length]

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

_common_args_checks(algorithm, length, otherinfo)
        self._algorithm = algorithm
        self._length = length
        self._otherinfo = otherinfo
        if self._otherinfo is None:
            self._otherinfo = b""

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

def _hash(self):
        return hashes.Hash(self._algorithm, self._backend)

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True
        return _concatkdf_derive(key_material, self._length,
                                 self._hash, self._otherinfo)

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

@utils.register_interface(KeyDerivationFunction)
class ConcatKDFHMAC(object):
    def __init__(self, algorithm, length, salt, otherinfo, backend):

if not (salt is None or isinstance(salt, bytes)):
            raise TypeError("salt must be bytes.")
        if salt is None:
            salt = b"\x00" * algorithm.block_size
        self._salt = salt

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

def _hmac(self):
        return hmac.HMAC(self._salt, self._algorithm, self._backend)

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True
        return _concatkdf_derive(key_material, self._length,
                                 self._hmac, self._otherinfo)

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