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편집 파일: __init__.cpython-39.pyc
a f�Wc�% � @ s� d Z ddlmZ ddlZe�e�ZddlmZ ddl m Z ddl m Z ddl mZ dd gZd Zd Zd Zd d� ZdZd"dd�Zdadad#dd �Zdd� Zdd� Zdd� ZdZ e eeed�Z d$d d �Z e d � d d!� Z dS )%zg passlib.utils.scrypt -- scrypt hash frontend and help utilities XXX: add this module to public docs? � )�absolute_importN)�warn)�exc)�to_bytes)�PYPY�validate�scrypt���l �� i���?c C sh |dk rt d| ��|dk r(t d| ��|| tkrDt d||f ��| dk sX| | d @ rdt d| ��dS )aI helper which validates a set of scrypt config parameters. scrypt will take ``O(n * r * p)`` time and ``O(n * r)`` memory. limitations are that ``n = 2**<positive integer>``, ``n < 2**(16*r)``, ``r * p < 2 ** 30``. :param n: scrypt rounds :param r: scrypt block size :param p: scrypt parallel factor � zr must be > 0: r=%rzp must be > 0: p=%rz!r * p must be < 2**30: r=%r, p=%r� z%n must be > 1, and a power of 2: n=%rT)� ValueError�MAX_RP)�n�r�p� r �B/usr/lib/python3.9/site-packages/passlib/crypto/scrypt/__init__.pyr ) s � ��������?c C s, |d| d| d t }t|| �}|S )a? calculate memory required for parameter combination. assumes parameters have already been validated. .. warning:: this is derived from OpenSSL's scrypt maxmem formula; and may not be correct for other implementations (additional buffers, different parallelism tradeoffs, etc). � � r )� UINT32_SIZE�int)r r r Zfudge�maxmemr r r �estimate_maxmemH s r r r c C sZ t |||� t| dd�} t|dd�}|dk r4td��|tkrHtdt ��t| |||||�S )a4 run SCrypt key derivation function using specified parameters. :arg secret: passphrase string (unicode is encoded to bytes using utf-8). :arg salt: salt string (unicode is encoded to bytes using utf-8). :arg n: integer 'N' parameter :arg r: integer 'r' parameter :arg p: integer 'p' parameter :arg keylen: number of bytes of key to generate. defaults to 32 (the internal block size). :returns: a *keylen*-sized bytes instance SCrypt imposes a number of constraints on it's input parameters: * ``r * p < 2**30`` -- due to a limitation of PBKDF2-HMAC-SHA256. * ``keylen < (2**32 - 1) * 32`` -- due to a limitation of PBKDF2-HMAC-SHA256. * ``n`` must a be a power of 2, and > 1 -- internal limitation of scrypt() implementation :raises ValueError: if the provided parameters are invalid (see constraints above). .. warning:: Unless the third-party ``scrypt <https://pypi.python.org/pypi/scrypt/>``_ package is installed, passlib will use a builtin pure-python implementation of scrypt, which is *considerably* slower (and thus requires a much lower / less secure ``n`` value in order to be usuable). Installing the :mod:`!scrypt` package is strongly recommended. �secret)Zparam�saltr zkeylen must be at least 1z keylen too large, must be <= %d)r r r � MAX_KEYLEN�_scrypt)r r r r r �keylenr r r r k s ) c C s. t rdnd} td| tj� ddlm} |jS )zD Load pure-python scrypt implementation built into passlib. � �d z�Using builtin scrypt backend, which is %dx slower than is required for adequate security. Installing scrypt support (via 'pip install scrypt') is strongly recommendedr )� ScryptEngine)r r r ZPasslibSecurityWarningZ_builtinr" Zexecute)Zslowdownr" r r r �_load_builtin_backend� s �� r# c C s� zddl m} | W S ty$ Y n0 z ddl }W n< tyn } z$dt|�vrZtdtj� W Y d}~nd}~0 0 tdtj� dS )z� Try to import the ctypes-based scrypt hash function provided by the ``scrypt <https://pypi.python.org/pypi/scrypt/>``_ package. r )�hashNr zJ'scrypt' package failed to import correctly (possible installation issue?)z5'scrypt' package is too old (lacks ``hash()`` method))r r$ � ImportError�strr r ZPasslibWarning)r$ r �errr r r �_load_cffi_backend� s � r( c s6 zddl m� W n ty$ Y dS 0 � fdd�} | S )zf Attempt to load stdlib scrypt() implement and return wrapper. Returns None if not found. r )r Nc s. t }|dk rt|||�}� | ||||||d�S )Nr )�passwordr r r r Zdklenr )� SCRYPT_MAXMEMr )r r r r r r r �Z stdlib_scryptr r �stdlib_scrypt_wrapper� s �z3_load_stdlib_backend.<locals>.stdlib_scrypt_wrapper)Zhashlibr r% )r, r r+ r �_load_stdlib_backend� s r- )Zstdlibr ZbuiltinFc C s� | dkr dS | dkrVt D ]0} zt| |d�W S tjyF Y qY q0 qt�d��nDt�| �}|srtd| f ��|� }|s�t�d| ��|r�dS | a|adS )z� set backend for scrypt(). if name not specified, loads first available. :raises ~passlib.exc.MissingBackendError: if backend can't be found .. note:: mainly intended to be called by unittests, and scrypt hash handler �anyN�default��dryrunz no scrypt backends availablezunknown scrypt backend: %rz scrypt backend %r not available) �backend_values� _set_backendr �MissingBackendError�_backend_loaders�getr �backendr )�namer1 �loaderr$ r r r r3 � s& r3 r/ c C s. zt | dd� W dS tjy( Y dS 0 d S )NTr0 F)r3 r r4 )r8 r r r � _has_backend s r: )r )r r )F)!�__doc__Z __future__r ZloggingZ getLogger�__name__�log�warningsr Zpasslibr Z passlib.utilsr Zpasslib.utils.compatr �__all__r* r r r r r r r7 r r# r( r- r2 �dictr5 r3 r: r r r r �<module> s< � 3 !�