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pkcs1_v2.cpython-310.pyc
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o j��`y � @ s� d Z ddlmZmZmZ ddedededefdd �Zd gZ e d krNe d � dd l Z e d �D ]Ze �� \ZZer9 ned dkrGerGe de � q-e d� d S d S )z�Functions for PKCS#1 version 2 encryption and signing This module implements certain functionality from PKCS#1 version 2. Main documentation is RFC 2437: https://tools.ietf.org/html/rfc2437 � )�common�pkcs1� transform�SHA-1�seed�length�hasher�returnc s� z t j� � j}W n ty& } ztdjd�tt j�� ��d��|�d}~ww |d| kr6t dj|� d���d�� �fd d �t t � ||�d �D ��}|d|� S ) a� MGF1 is a Mask Generation Function based on a hash function. A mask generation function takes an octet string of variable length and a desired output length as input, and outputs an octet string of the desired length. The plaintext-awareness of RSAES-OAEP relies on the random nature of the output of the mask generation function, which in turn relies on the random nature of the underlying hash. :param bytes seed: seed from which mask is generated, an octet string :param int length: intended length in octets of the mask, at most 2^32(hLen) :param str hasher: hash function (hLen denotes the length in octets of the hash function output) :return: mask, an octet string of length `length` :rtype: bytes :raise OverflowError: when `length` is too large for the specified `hasher` :raise ValueError: when specified `hasher` is invalid z=Invalid `hasher` specified. Please select one of: {hash_list}z, )� hash_listNl zmDesired length should be at most 2**32 times the hasher's output length ({hash_length} for {hasher} function))� hash_lengthr � c 3 s, � | ]}t j�tj|d d� � d�V qdS )� )� fill_size)� method_nameN)r � compute_hashr � int2bytes)�.0�counter�r r � �./usr/lib/python3/dist-packages/rsa/pkcs1_v2.py� <genexpr>H s � �� �zmgf1.<locals>.<genexpr>� ) r � HASH_METHODS� digest_size�KeyError� ValueError�format�join�sorted�keys� OverflowError�ranger �ceil_div)r r r r �ex�outputr r r �mgf1 s0 ����� �� � r& �__main__z'Running doctests 1000x or until failureNi� �d z%i timesz Doctests done)r )�__doc__�rsar r r �bytes�int�strr& �__all__�__name__�print�doctestr" �count�testmod�failures�testsr r r r �<module> s" 9� � �