o e @sdZddlmZmZmZddedededefdd Zd gZ e d krNe d dd l Z e d D]Ze \ZZer9neddkrGerGe deq-e dd Sd S)zFunctions 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 )commonpkcs1 transformSHA-1seedlengthhasherreturnc sz tjj}Wnty&}ztdjdttjd|d}~ww|d|kr6t dj|ddfd 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_listNlzmDesired length should be at most 2**32 times the hasher's output length ({hash_length} for {hasher} function)) hash_lengthrc3s,|]}tjtj|dddVqdS)) fill_size) method_nameN)r compute_hashr int2bytes).0counterrr7/usr/local/lib/python3.10/dist-packages/rsa/pkcs1_v2.py Hs zmgf1..) r HASH_METHODS digest_sizeKeyError ValueErrorformatjoinsortedkeys OverflowErrorrangerceil_div)rrrr exoutputrrrmgf1s0   r&__main__z'Running doctests 1000x or until failureNidz%i timesz Doctests done)r)__doc__rsarrrbytesintstrr&__all____name__printdoctestr"counttestmodfailurestestsrrrrs"9