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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.

from __future__ import absolute_import, division, print_function

import sys

from cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized,
    InvalidKey,
    UnsupportedAlgorithm,
    _Reasons,
)
from cryptography.hazmat.backends import _get_backend
from cryptography.hazmat.backends.interfaces import ScryptBackend
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

@utils.register_interface(KeyDerivationFunction)
class Scrypt(object):
    def __init__(self, salt, length, n, r, p, backend=None):
        backend = _get_backend(backend)
        if not isinstance(backend, ScryptBackend):
            raise UnsupportedAlgorithm(
                "Backend object does not implement ScryptBackend.",
                _Reasons.BACKEND_MISSING_INTERFACE,
            )

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
        self._backend = backend

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

utils._check_byteslike("key_material", key_material)
        return self._backend.derive_scrypt(
            key_material, self._salt, self._length, self._n, self._r, self._p
        )

def verify(self, key_material, expected_key):
        derived_key = self.derive(key_material)
        if not constant_time.bytes_eq(derived_key, expected_key):
            raise InvalidKey("Keys do not match.")

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-08-28 06:43:14
..	dir	-	0755	2025-08-28 06:43:14
__pycache__	dir	-	0755	2025-08-28 06:43:14
__init__.py	text/x-script.python	771 B	0644	2020-10-28 03:11:40
concatkdf.py	text/x-script.python	4 KB	0644	2020-10-28 03:11:40
hkdf.py	text/x-script.python	3.51 KB	0644	2020-10-28 03:11:40
kbkdf.py	text/x-script.python	4.98 KB	0644	2020-10-28 03:11:40
pbkdf2.py	text/x-script.python	2.17 KB	0644	2020-10-28 03:11:40
scrypt.py	text/x-script.python	2.21 KB	0644	2020-10-28 03:11:40
x963kdf.py	text/x-script.python	2.35 KB	0644	2020-10-28 03:11:40