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a c�h�! � @ sX g d �Z ddlmZ ddlmZmZmZ ddlmZ dd� Z dd� Z G d d � d e �Z d S ) )�generate� construct� ElGamalKey� )�Random)� generate_probable_safe_prime�test_probable_prime� COMPOSITE��Integerc C s� t � }t| |d�|_|jd d? }ttjd|j|d�d|j�|_|jdv rLq"|jd |j dkrbq"|j�|j�}|jd | dkr�q"q�q"tjd|jd |d�|_t|j|j|j�|_ |S )a Randomly generate a fresh, new ElGamal key. The key will be safe for use for both encryption and signature (although it should be used for **only one** purpose). Args: bits (int): Key length, or size (in bits) of the modulus *p*. The recommended value is 2048. randfunc (callable): Random number generation function; it should accept a single integer *N* and return a string of random *N* random bytes. Return: an :class:`ElGamalKey` object )Z exact_bits�randfunc� � �Z min_inclusiveZ max_exclusiver )r r r ) r r �p�powr � random_range�g�inverse�x�y)�bitsr �obj�qZginv� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/Crypto/PublicKey/ElGamal.pyr " s. �� �r c C s� t � }t| �dvrtd��tt| ��D ]"}|j| }t||t| | �� q&t|j�t k}||j dkpn|j |jkO }|t |j |jd |j�dkO }||j dk p�|j |jkO }t| �dkr�||j dkp�|j |jkO }|t |j |j |j�|j kO }|r�td��|S )a� Construct an ElGamal key from a tuple of valid ElGamal components. The modulus *p* must be a prime. The following conditions must apply: .. math:: \begin{align} &1 < g < p-1 \\ &g^{p-1} = 1 \text{ mod } 1 \\ &1 < x < p-1 \\ &g^x = y \text{ mod } p \end{align} Args: tup (tuple): A tuple with either 3 or 4 integers, in the following order: 1. Modulus (*p*). 2. Generator (*g*). 3. Public key (*y*). 4. Private key (*x*). Optional. Raises: ValueError: when the key being imported fails the most basic ElGamal validity checks. Returns: an :class:`ElGamalKey` object )� � z%argument for construct() wrong lengthr r z Invalid ElGamal key components)r �len� ValueError�range�_keydata�setattrr r r r r r r r )�tupr �i�fieldZ fmt_errorr r r r ` s r c @ s� e Zd ZdZg d�Zd*dd�Zdd� Zdd � Zd d � Zd d � Z dd� Z dd� Z dd� Z dd� Z dd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$d%� Zd&d'� Zd(d)� ZdS )+r aP Class defining an ElGamal key. Do not instantiate directly. Use :func:`generate` or :func:`construct` instead. :ivar p: Modulus :vartype d: integer :ivar g: Generator :vartype e: integer :ivar y: Public key component :vartype y: integer :ivar x: Private key component :vartype x: integer )r r r r Nc C s |d u rt �� j}|| _d S �N)r �new�read� _randfunc)�selfr r r r �__init__� s zElGamalKey.__init__c C s: t | j|| j�}t | j|| j�| | j }t|�t|�gS r% )r r r r �int)r) �M�K�a�br r r �_encrypt� s zElGamalKey._encryptc C s� t | d�std��tjd| jd | jd�}t| j|| j�|d | j }t|| j| j�}|� | j�|d | j }|t| j || j� | j }t |�S )Nr �(Private key not available in this objectr r r r ) �hasattr� TypeErrorr r r r( r r r r r r+ )r) r, �rZa_blind�axZplaintext_blind� plaintextr r r �_decrypt� s � zElGamalKey._decryptc C s� t | d�std��| jd }t|�}|�|�dkr:td��t| j|| j�}t|�| j| | }|dk rr|| }q`||� |� | }t |�t |�gS )Nr r1 r zBad K value: GCD(K,p-1)!=1r ) r2 r3 r r �gcdr r r r r r+ )r) r, r- �p1r. �tr/ r r r �_sign� s zElGamalKey._signc C s� dd� |D �}|d dk s,|d | j d kr0dS t| j|d | j �}|t|d |d | j � | j }t| j|| j �}||kr�dS dS )Nc S s g | ] }t |��qS r r )�.0r r r r � <listcomp>� � z&ElGamalKey._verify.<locals>.<listcomp>r r )r r r r )r) r, �sigZv1Zv2r r r �_verify� s zElGamalKey._verifyc C s t | d�rdS dS dS )z&Whether this is an ElGamal private keyr r r N)r2 �r) r r r � has_private� s zElGamalKey.has_privatec C s dS �NTr rA r r r � can_encrypt� s zElGamalKey.can_encryptc C s dS rC r rA r r r �can_sign� s zElGamalKey.can_signc C s t | j| j| jf�S )zfA matching ElGamal public key. Returns: a new :class:`ElGamalKey` object )r r r r rA r r r � publickey� s zElGamalKey.publickeyc C sP t | �� �t |�� �kr dS d}| jD ]$}|oHt| j|d �t|j|d �k}q&|S )NFT)�boolrB r �getattr�key)r) �other�result�compr r r �__eq__� s �zElGamalKey.__eq__c C s | � |� S r% )rM )r) rJ r r r �__ne__ s zElGamalKey.__ne__c C s ddl m} |�d S )Nr )� PicklingError)�picklerO )r) rO r r r � __getstate__ s zElGamalKey.__getstate__c C s t �d S r% ��NotImplementedError)r) r, r- r r r �sign s zElGamalKey.signc C s t �d S r% rR )r) r, � signaturer r r �verify s zElGamalKey.verifyc C s t �d S r% rR )r) r6 r- r r r �encrypt s zElGamalKey.encryptc C s t �d S r% rR )r) Z ciphertextr r r �decrypt s zElGamalKey.decryptc C s t �d S r% rR �r) r, �Br r r �blind s zElGamalKey.blindc C s t �d S r% rR rY r r r �unblind s zElGamalKey.unblindc C s t �d S r% rR rA r r r �size s zElGamalKey.size)N)�__name__� __module__� __qualname__�__doc__r r* r0 r7 r; r@ rB rD rE rF rM rN rQ rT rV rW rX r[ r\ r] r r r r r � s* r N) �__all__ZCryptor ZCrypto.Math.Primalityr r r ZCrypto.Math.Numbersr r r �objectr r r r r �<module> s >4
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