o
    
c                     @   sL   d dl Z d dlmZmZ d dlmZ e jrd dlmZ G dd dej	Z
dS )    N)UnsupportedAlgorithm_Reasons)hashes)Backendc                   @   st   e Zd Z	ddddejddfddZedejfdd	Zdd
dZde	ddfddZ
de	fddZde	fddZdS )_HashContextNbackendr   	algorithmreturnc                 C   s   || _ || _|d u rF| jj }| jj|| jjj}| j|}|| jjjkr2t	d
|jtj| jj||| jjj}| j|dk || _d S )Nz+{} is not a supported hash on this backend.r   )
_algorithm_backend_libEVP_MD_CTX_new_ffigcEVP_MD_CTX_free_evp_md_from_algorithmNULLr   formatnamer   UNSUPPORTED_HASHEVP_DigestInit_exopenssl_assert_ctx)selfr   r   ctxevp_mdres r   X/opt/certbot/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/hashes.py__init__   s(   

z_HashContext.__init__c                 C   s   | j S N)r
   )r   r   r   r   r   *   s   z_HashContext.algorithmc                 C   sV   | j j }| j j|| j jj}| j j|| j}| j |dk t	| j | j
|dS )Nr   )r   )r   r   r   r   r   r   EVP_MD_CTX_copy_exr   r   r   r   )r   
copied_ctxr   r   r   r   copy.   s   
z_HashContext.copydatac                 C   s:   | j j|}| j j| j|t|}| j |dk d S )Nr   )r   r   from_bufferr   EVP_DigestUpdater   lenr   )r   r$   data_ptrr   r   r   r   update7   s
   z_HashContext.updatec                 C   s   t | jtjr|  S | jjd| jjj	}| jjd}| jj
| j||}| j|dk | j|d | jjk | jj|d |d  S )Nunsigned char[]zunsigned int *r   )
isinstancer   r   ExtendableOutputFunction_finalize_xofr   r   newr   EVP_MAX_MD_SIZEEVP_DigestFinal_exr   r   digest_sizebuffer)r   bufoutlenr   r   r   r   finalize>   s   
z_HashContext.finalizec                 C   sV   | j jd| jj}| j j| j|| jj}| j |dk | j j	|d | jj S )Nr*   r   )
r   r   r.   r   r1   r   EVP_DigestFinalXOFr   r   r2   )r   r3   r   r   r   r   r-   N   s   z_HashContext._finalize_xofr    )r	   r   )__name__
__module____qualname__r   HashAlgorithmr   propertyr   r#   bytesr)   r5   r-   r   r   r   r   r      s    

	r   )typingcryptography.exceptionsr   r   cryptography.hazmat.primitivesr   TYPE_CHECKING,cryptography.hazmat.backends.openssl.backendr   HashContextr   r   r   r   r   <module>   s   