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__pycache__	-	Open
concatkdf.py	3.68 MB	View DL Edit
hkdf.py	2.96 MB	View DL Edit
kbkdf.py	7.49 MB	View DL Edit
pbkdf2.py	1.98 MB	View DL Edit
scrypt.py	2.18 MB	View DL Edit
x963kdf.py	1.96 MB	View DL Edit
__init__.py	715 B	View DL Edit

Edit file: /usr/lib64/python3.9/site-packages/cryptography/hazmat/primitives/kdf/scrypt.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.

import sys
import typing

from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized,
    InvalidKey,
    UnsupportedAlgorithm,
)
from cryptography.hazmat.primitives import constant_time
from cryptography.hazmat.primitives.kdf import KeyDerivationFunction

# This is used by the scrypt tests to skip tests that require more memory
# than the MEM_LIMIT
_MEM_LIMIT = sys.maxsize // 2

class Scrypt(KeyDerivationFunction):
    def __init__(
        self,
        salt: bytes,
        length: int,
        n: int,
        r: int,
        p: int,
        backend: typing.Any = None,
    ):
        from cryptography.hazmat.backends.openssl.backend import (
            backend as ossl,
        )

if not ossl.scrypt_supported():
            raise UnsupportedAlgorithm(
                "This version of OpenSSL does not support scrypt"
            )
        self._length = length
        utils._check_bytes("salt", salt)
        if n < 2 or (n & (n - 1)) != 0:
            raise ValueError("n must be greater than 1 and be a power of 2.")

if r < 1:
            raise ValueError("r must be greater than or equal to 1.")

if p < 1:
            raise ValueError("p must be greater than or equal to 1.")

self._used = False
        self._salt = salt
        self._n = n
        self._r = r
        self._p = p

def derive(self, key_material: bytes) -> bytes:
        if self._used:
            raise AlreadyFinalized("Scrypt instances can only be used once.")
        self._used = True

utils._check_byteslike("key_material", key_material)
        from cryptography.hazmat.backends.openssl.backend import backend

return backend.derive_scrypt(
            key_material, self._salt, self._length, self._n, self._r, self._p
        )

def verify(self, key_material: bytes, expected_key: bytes) -> None:
        derived_key = self.derive(key_material)
        if not constant_time.bytes_eq(derived_key, expected_key):
            raise InvalidKey("Keys do not match.")

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