o
    b&	                     @   sP   d dl Z d dlmZ d dlmZ d dlmZ dd Zdd Zd	d
 Z	dd Z
dS )    N)utils)hashes)	Prehashedc                 C   s  | j || jj}| || jjk | j|| j j}| j |}| |dk | j ||j	}| |dk | j
d}| j || jj|}| |dk | |d dk | j
d|d }| j |||}|dkru|  }td|| j||d d d  S )N   zsize_t *r   zunsigned char[]zError computing shared key.)Z_libZEVP_PKEY_CTX_newZ_ffiZNULLZopenssl_assertgcZEVP_PKEY_CTX_freeZEVP_PKEY_derive_initZEVP_PKEY_derive_set_peerZ	_evp_pkeynewZEVP_PKEY_deriveZ_consume_errors_with_text
ValueErrorbuffer)backendZevp_pkeyZpeer_public_keyctxresZkeylenbufZerrors_with_text r   i/var/www/secure340b-portal/env/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/utils.py_evp_pkey_derive   s"   
r   c                 C   sN   t |tst|| }|| | }n|j}t||jkr#t	d||fS )NzNThe provided data must be the same length as the hash algorithm's digest size.)

isinstancer   r   ZHashupdatefinalize
_algorithmlendigest_sizer   )r
   data	algorithmZhash_ctxr   r   r   _calculate_digest_and_algorithm"   s   


r   c                 C   s   t | tr	tdd S )NzPrehashed is only supported in the sign and verify methods. It cannot be used with signer, verifier or recover_data_from_signature.)r   r   	TypeError)Zsignature_algorithmr   r   r   _check_not_prehashed3   s
   
r   c                   C   s   t jdtjdd d S )NzMsigner and verifier have been deprecated. Please use sign and verify instead.   )
stacklevel)warningswarnr   ZPersistentlyDeprecated2017r   r   r   r   _warn_sign_verify_deprecated<   s
   
r    )r   Zcryptographyr   Zcryptography.hazmat.primitivesr   Z/cryptography.hazmat.primitives.asymmetric.utilsr   r   r   r   r    r   r   r   r   <module>   s   	