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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.
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only the lower bits set.
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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.
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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
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