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o �ha � @ sp d Z ddlZddlZddlmZmZ dedefdd�Zdedefdd �Z dedefd d �Z d edefd d�Z dS )z(Functions for generating random numbers.� N)�common� transform�nbits�returnc C sN t | d�\}}t�|�}|dkr%tt�d��}|d| L }t�d|�| }|S )z�Reads 'nbits' random bits. If nbits isn't a whole number of bytes, an extra byte will be appended with only the lower bits set. � r � �B)�divmod�os�urandom�ord�struct�pack)r �nbytes�rbits� randomdata� randomvalue� r �>/usr/local/CyberCP/lib/python3.10/site-packages/rsa/randnum.py�read_random_bits s r c C s& t | �}t�|�}|d| d > O }|S )z3Reads a random integer of approximately nbits bits.r )r r � bytes2int)r r �valuer r r �read_random_int. s r c C s t | �}|dB S )zhReads a random odd integer of approximately nbits bits. >>> read_random_odd_int(512) & 1 1 r )r )r r r r r �read_random_odd_int; s r �maxvaluec C sH t �| �}d} t|�}|| kr |S |d dkr |r |d8 }|d7 }q)z�Returns a random integer x with 1 <= x <= maxvalue May take a very long time in specific situations. If maxvalue needs N bits to store, the closer maxvalue is to (2 ** N) - 1, the faster this function is. r T� r )r �bit_sizer )r r �triesr r r r �randintH s ��r ) �__doc__r r �rsar r �int�bytesr r r r r r r r �<module> s
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