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o �h� � @ sJ d Z ddlZddlmZ ddlmZ ddlmZ dd� ZG dd � d �Z dS ) z, Utility functions for dealing with primes. � N)�util)� byte_mask)� SSHExceptionc C sv t �| d �}|d d }td|d �d } t�|�}|dkr-t|d |�|dd� }t �|d�}|| k r: |S q)z returns a random # from 0 to N-1� � � � Tr N)r � bit_length�pow�os�urandomr � inflate_long)�n�bits� byte_count� hbyte_mask�x�num� r �B/usr/local/CyberCP/lib/python3.10/site-packages/paramiko/primes.py� _roll_random s �r c @ s0 e Zd ZdZdd� Zdd� Zdd� Zdd � Zd S ) � ModulusPackzx convenience object for holding the contents of the /etc/ssh/moduli file, on systems that have such a file. c C s i | _ g | _d S )N)�pack� discarded)�selfr r r �__init__: s zModulusPack.__init__c C s� |� � \}}}}}}}t|�}t|�}t|�}t|�}t|�}t|d�}|dk s8|dk s8|d@ rB|dk rB|dk rB| j�|df� d S |dkrHd}t�|�} | |krd| |d krd| j�|d �|�f� d S | | jvrng | j| < | j| �||f� d S ) N� r � r �d z does not meet basic requirementsr r z"incorrectly reported bit length {})�split�intr �appendr r �formatr ) r �line� timestamp�mod_type�tests�tries�size� generator�modulus�blr r r �_parse_modulus? sF � �� � zModulusPack._parse_modulusc C sz i | _ t|d��+}|D ] }|�� }t|�dks |d dkr q z| �|� W q Y q W d � dS 1 s6w Y dS )zM :raises IOError: passed from any file operations that fail. �rr �#N)r �open�strip�lenr, )r �filename�fr# r r r � read_filem s �"�zModulusPack.read_filec C s� t | j�� �}t|�dkrtd��d}|D ]}||kr)||kr)||k s'|dkr)|}q|dkrA|D ]}||kr@||kr@||kr@|}q0|dkrQ|d }||krQ|d }tt| j| ��}| j| | S )Nr zno moduli available���)�sortedr �keysr1 r r )r �min�prefer�max�bitsizes�good�br r r r � get_modulus| s& ��zModulusPack.get_modulusN)�__name__� __module__� __qualname__�__doc__r r, r4 r> r r r r r 4 s . r ) rB r �paramikor �paramiko.commonr �paramiko.ssh_exceptionr r r r r r r �<module> s
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