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o �)%a� � @ s� d dl Z d dlZd dlmZ d dlmZmZmZmZ d dl m Z d dl m Z d dl m Z d dlmZmZmZ d dlmZ d ed efd d �Zd ejdedeje fdd�Zdededejg ejf ded ef dd�Z G dd� de�Z G dd� de�Z dS )� N)�utils)�AlreadyFinalized� InvalidKey�UnsupportedAlgorithm�_Reasons)� _get_backend)� HMACBackend)� HashBackend)� constant_time�hashes�hmac)�KeyDerivationFunction�n�returnc C s t �d| �S )Nz>I)�struct�pack)r � r �N/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/kdf/concatkdf.py� _int_to_u32be s r � algorithm�length� otherinfoc C s< | j d }||krtd�|���|d ur t�d|� d S d S )Nl �� z(Can not derive keys larger than {} bits.r )� digest_size� ValueError�formatr � _check_bytes)r r r � max_lengthr r r �_common_args_checks s ��r � key_material�auxfnc 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 � r- c @ sf e Zd Z ddejdedeje fdd�Z dej fdd �Z d edefd d �Z d ed eddfdd�Z dS )� ConcatKDFHashNr r r c C sX t |�}t|||� || _|| _|d ur|nd| _t|t�s$tdtj ��|| _ d| _ d S )Nr z.Backend object does not implement HashBackend.F) r r � _algorithm�_length� _otherinfo� isinstancer r r �BACKEND_MISSING_INTERFACE�_backend�_used)�selfr r r �backendr r r �__init__A s � zConcatKDFHash.__init__r c C s t �| j| j�S �N)r �Hashr/ r4 �r6 r r r �_hashW s zConcatKDFHash._hashr c C �$ | j rt�d| _ t|| j| j| j�S �NT)r5 r r- r0 r< r1 �r6 r r r r �deriveZ � �zConcatKDFHash.derive� expected_keyc C � t �| �|�|�s t�d S r9 �r �bytes_eqr@ r �r6 r rB r r r �verifyb � �zConcatKDFHash.verifyr9 )�__name__� __module__� __qualname__r � HashAlgorithm�int�typing�Optional�bytesr8 r: r< r@ rG r r r r r. @ s ��� �r. c @ sp e Zd Z ddejdedeje deje fdd�Z de j fd d �Z d edefd d �Z d ededdfdd�ZdS )� ConcatKDFHMACNr r �saltr c C s� t |�}t|||� || _|| _|d ur|nd| _|jd u r&td�|j���|d u r0d|j }nt � d|� || _ t |t �sDtdtj��|| _d| _d S )Nr z {} is unsupported for ConcatKDF� rR z.Backend object does not implement HMACBackend.F)r r r/ r0 r1 � block_size� TypeErrorr �namer r �_saltr2 r r r r3 r4 r5 )r6 r r rR r r7 r r r r8 h s( � � zConcatKDFHMAC.__init__r c C s t �| j| j| j�S r9 )r �HMACrW r/ r4 r; r r r �_hmac� s zConcatKDFHMAC._hmacr c C r= r> )r5 r r- r0 rY r1 r? r r r r@ � rA zConcatKDFHMAC.deriverB c C rC r9 rD rF r r r rG � rH zConcatKDFHMAC.verifyr9 )rI rJ rK r rL rM rN rO rP r8 r rX rY r@ rG r r r r rQ g s ���� �#rQ ) r rN � cryptographyr �cryptography.exceptionsr r r r � cryptography.hazmat.backendsr �'cryptography.hazmat.backends.interfacesr r � cryptography.hazmat.primitivesr r r �"cryptography.hazmat.primitives.kdfr rM rP r rL rO r �Callable� HashContextr- r. rQ r r r r �<module> s< �� ����� �'
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