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o �hf � @ s� d dl mZ d dlZd dlmZ d dlmZmZ d dlm Z m Z m Z d dl m Z d d d �Zd dd�Zd dd�ZG dd� de �ZG d d � d e �ZdS )!� )� annotationsN)�utils)�AlreadyFinalized� InvalidKey)� constant_time�hashes�hmac)�KeyDerivationFunction�n�int�return�bytesc C s | j ddd�S )N� �big)�length� byteorder)�to_bytes)r � r �_/usr/local/CyberCP/lib/python3.10/site-packages/cryptography/hazmat/primitives/kdf/concatkdf.py� _int_to_u32be s r � algorithm�hashes.HashAlgorithmr � otherinfo� bytes | None�Nonec C s> | j d }||krtd|� d���|d ur t�d|� d S d S )Nl �� z Cannot derive keys larger than z bits.r )� digest_size� ValueErrorr � _check_bytes)r r r � max_lengthr r r �_common_args_checks s �r � key_material�auxfn�'typing.Callable[[], hashes.HashContext]c C s� t �d| � dg}d}d}||kr<|� }|�t|�� |�| � |�|� |�|�� � |t|d �7 }|d7 }||ksd�|�d |� S )Nr � r � ���)r �_check_byteslike�updater �append�finalize�len�join)r r r! r �output�outlen�counter�hr r r �_concatkdf_derive s � r0 c @ s8 e Zd Z ddd d �Zddd�Zddd�Zd dd�ZdS ) � ConcatKDFHashNr r r r r r �backend� typing.Anyc C s4 t |||� || _|| _|d ur|nd| _d| _d S )Nr# F)r � _algorithm�_length� _otherinfo�_used)�selfr r r r2 r r r �__init__7 s zConcatKDFHash.__init__r � hashes.Hashc C s t �| j�S �N)r �Hashr4 �r8 r r r �_hashE s zConcatKDFHash._hashr r c C �$ | j rt�d| _ t|| j| j| j�S �NT)r7 r r0 r5 r> r6 �r8 r r r r �deriveH � �zConcatKDFHash.derive� expected_keyr c C � t �| �|�|�s t�d S r; �r �bytes_eqrB r �r8 r rD r r r �verifyP � �zConcatKDFHash.verifyr; )r r r r r r r2 r3 )r r: �r r r r �r r rD r r r )�__name__� __module__� __qualname__r9 r> rB rI r r r r r1 6 s � r1 c @ s8 e Zd Z ddd d �Zddd�Zd dd�Zd dd�ZdS ) � ConcatKDFHMACNr r r r �saltr r r2 r3 c C st t |||� || _|| _|d ur|nd| _|jd u r"t|j� d���|d u r,d|j }nt�d|� || _ d| _ d S )Nr# z is unsupported for ConcatKDF� rQ F) r r4 r5 r6 � block_size� TypeError�namer r �_saltr7 )r8 r r rQ r r2 r r r r9 V s zConcatKDFHMAC.__init__r � hmac.HMACc C s t �| j| j�S r; )r �HMACrV r4 r= r r r �_hmaco s zConcatKDFHMAC._hmacr r c C r? r@ )r7 r r0 r5 rY r6 rA r r r rB r rC zConcatKDFHMAC.deriverD r c C rE r; rF rH r r r rI z rJ zConcatKDFHMAC.verifyr; ) r r r r rQ r r r r2 r3 )r rW rK rL )rM rN rO r9 rY rB rI r r r r rP U s � rP )r r r r )r r r r r r r r ) r r r r r! r" r r r r )� __future__r �typing� cryptographyr �cryptography.exceptionsr r � cryptography.hazmat.primitivesr r r �"cryptography.hazmat.primitives.kdfr r r r0 r1 rP r r r r �<module> s
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