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o g�e�+ � @ s� d dl mZmZ d dlmZ d dlmZ dd� Zdd� ZG dd � d ej �Z d e fd d �Z G d d� dej �ZG dd� dej�ZdS )� )�UnsupportedAlgorithm�_Reasons)� serialization)�dhc C s� |j }|j}|�| �}|�||jk� |�||j�}|jrD|�d�}|� | |j||j� |� |d �}|� ||j||j�}|�|dk� |S �N� BIGNUM **r � ) �_lib�_ffi� DHparams_dup�openssl_assert�NULL�gc�DH_free�CRYPTOGRAPHY_IS_LIBRESSL�new� DH_get0_pqg�BN_dup� DH_set0_pqg)�dh_cdata�backend�lib�ffi� param_cdata�q�q_dup�res� r �I/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/dh.py�_dh_params_dup s r c C s t | |�}t||�S �N)r � _DHParameters)r r r r r r �_dh_cdata_to_parameters s r" c @ sN e Zd Zdd� Zdejfdd�Zdejfdd�Zde j d e j de fd d �Z d S ) r! c C s || _ || _d S r )�_backend� _dh_cdata)�selfr r r r r �__init__# s z_DHParameters.__init__�returnc C s� | j j�d�}| j j�d�}| j j�d�}| j j�| j|||� | j �|d | j jjk� | j �|d | j jjk� |d | j jjkrFd }n| j �|d �}t j | j �|d �| j �|d �|d�S )Nr r ��p�gr ) r# r r r r r$ r r � _bn_to_intr �DHParameterNumbers)r% r) r* r �q_valr r r �parameter_numbers' s �z _DHParameters.parameter_numbersc C s | j �| �S r )r# �generate_dh_private_key�r% r r r �generate_private_key8 s z"_DHParameters.generate_private_key�encoding�formatc C s~ |t jjur td��| jjjs6| jj�d�}| jj� | j | jjj || jjj � |d | jjj kr6t dt j��| j�||| j �S )Nz%Only PKCS3 serialization is supportedr r �'DH X9.42 serialization is not supported)r �ParameterFormat�PKCS3� ValueErrorr# r � Cryptography_HAS_EVP_PKEY_DHXr r r r$ r r r �UNSUPPORTED_SERIALIZATION�_parameter_bytes�r% r2 r3 r r r r �parameter_bytes; s ��z _DHParameters.parameter_bytesN)�__name__� __module__� __qualname__r& r r, r. � DHPrivateKeyr1 r �Encodingr5 �bytesr< r r r r r! " s ���r! r' c C sL | j �d�}| j�||| j j| j j� | �|d | j jk� | j�|d �S )Nr r )r r r r r r � BN_num_bits)r r r) r r r �_get_dh_num_bitsS s rD c @ s� e Zd Zdd� Zedefdd��Zdejfdd�Z dej de fd d �Z d d � Z dej fd d�Zdejfdd�Zdejdejdejde fdd�ZdS )� _DHPrivateKeyc C s& || _ || _|| _| j j�|�| _d S r )r# r$ � _evp_pkeyr �DH_size�_key_size_bytes�r% r r �evp_pkeyr r r r& [ � z_DHPrivateKey.__init__r' c C � t | j| j�S r )rD r# r$ r0 r r r �key_sizea s z_DHPrivateKey.key_sizec C sT | j j�d�}| j j�d�}| j j�d�}| j j�| j|||� | j �|d | j jjk� | j �|d | j jjk� |d | j jjkrFd }n| j �|d �}| j j�d�}| j j�d�}| j j� | j||� | j �|d | j jjk� | j �|d | j jjk� t j t j t j | j �|d �| j �|d �|d�| j �|d �d�| j �|d �d�S )Nr r r( �r. �y)�public_numbers�x)r# r r r r r$ r r r+ � DH_get0_keyr �DHPrivateNumbers�DHPublicNumbersr, )r% r) r* r r- �pub_key�priv_keyr r r �private_numberse s2 ���z _DHPrivateKey.private_numbers�peer_public_keyc C sT t |t�s td��| jj�| j| jjj�}| j� || jjjk� | jj� || jjj �}| jj� |�}| j� |dk� | jj� ||j�}| �|dk� | jj�d�}| jj�|| jjj|�}| �|dk� | j� |d dk� | jj�d|d �}| jj�|||�}| j� |dk� | jj�||d �d d � }| jt|� }|dkr�d| | }|S )Nz%peer_public_key must be a DHPublicKeyr zsize_t *r zunsigned char[]� )� isinstance� _DHPublicKey� TypeErrorr# r �EVP_PKEY_CTX_newrF r r r r �EVP_PKEY_CTX_free�EVP_PKEY_derive_init�EVP_PKEY_derive_set_peer�_exchange_assertr �EVP_PKEY_derive�bufferrH �len)r% rX �ctxr �keylen�buf�key�padr r r �exchange� s6 �� � z_DHPrivateKey.exchangec C s |s | j �� }td|��d S )NzError computing shared key.)r# �_consume_errors_with_textr7 )r% �ok�errors_with_textr r r ra � s ��z _DHPrivateKey._exchange_assertc C s� t | j| j�}| jj�d�}| jj�| j|| jjj� | j�|d | jjjk� | jj� |d �}| j�|| jjjk� | jj� ||| jjj�}| j�|dk� | j� |�}t | j||�S r ) r r$ r# r r r rR r r r � DH_set0_key�_dh_cdata_to_evp_pkeyr[ )r% r rU � pub_key_dupr rJ r r r � public_key� s � � z_DHPrivateKey.public_keyc C rL r �r" r$ r# r0 r r r � parameters� � z_DHPrivateKey.parametersr2 r3 �encryption_algorithmc C s� |t jjur td��| jjjs6| jj�d�}| jj� | j | jjj || jjj � |d | jjj kr6t dt j��| j�|||| | j| j �S )Nz0DH private keys support only PKCS8 serializationr r r4 )r � PrivateFormat�PKCS8r7 r# r r8 r r r r$ r r r r9 �_private_key_bytesrF )r% r2 r3 ru r r r r � private_bytes� s2 � ���z_DHPrivateKey.private_bytesN)r= r> r? r& �property�intrM r rS rW � DHPublicKeyrB rj ra rq � DHParametersrs r rA rv �KeySerializationEncryptionry r r r r rE Z s$ $����rE c @ s` e Zd Zdd� Zedefdd��Zdejfdd�Z dej fdd �Z d e j d e jdefd d �ZdS )r[ c C s& || _ || _|| _t| j | j�| _d S r )r# r$ rF rD �_key_size_bitsrI r r r r& � rK z_DHPublicKey.__init__r' c C s | j S r )r r0 r r r rM � s z_DHPublicKey.key_sizec C s | j j�d�}| j j�d�}| j j�d�}| j j�| j|||� | j �|d | j jjk� | j �|d | j jjk� |d | j jjkrFd }n| j �|d �}| j j�d�}| j j� | j|| j jj� | j �|d | j jjk� t j t j | j �|d �| j �|d �|d�| j �|d �d�S )Nr r r( rN ) r# r r r r r$ r r r+ rR r rT r, )r% r) r* r r- rU r r r rP � s, ���z_DHPublicKey.public_numbersc C rL r rr r0 r r r rs rt z_DHPublicKey.parametersr2 r3 c C s� |t jjur td��| jjjs6| jj�d�}| jj� | j | jjj || jjj � |d | jjj kr6t dt j��| j�||| | jd �S )Nz>DH public keys support only SubjectPublicKeyInfo serializationr r r4 )r � PublicFormat�SubjectPublicKeyInfor7 r# r r8 r r r r$ r r r r9 �_public_key_bytesrF r; r r r � public_bytes s( � �� �z_DHPublicKey.public_bytesN)r= r> r? r& rz r{ rM r rT rP r} rs r rA r� rB r� r r r r r[ � s ���r[ N)�cryptography.exceptionsr r � cryptography.hazmat.primitivesr �)cryptography.hazmat.primitives.asymmetricr r r" r} r! r{ rD r@ rE r| r[ r r r r �<module> s 1
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