o
    b}                     @   s:   d dl mZmZmZ d dlmZmZ G dd dejZdS )    )InvalidSignatureUnsupportedAlgorithm_Reasons)constant_timehashesc                   @   st   e Zd Z	ddedej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ddfddZdS )_HMACContextNkey	algorithmc                 C   s   || _ || _|d u r\| jj }| j|| jjjk | jj|| jjj}| j	|}|| jjjkr=t
d|jtj| jj|}| jj||t||| jjj}| j|dk || _|| _d S )Nz*{} is not a supported hash on this backendr   )
_algorithm_backend_libHMAC_CTX_newopenssl_assert_ffiNULLgcHMAC_CTX_freeZ_evp_md_from_algorithmr   formatnamer   ZUNSUPPORTED_HASHfrom_bufferZHMAC_Init_exlen_ctx_key)selfbackendr   r	   ctxZevp_mdZkey_ptrres r   h/var/www/secure340b-portal/env/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/hmac.py__init__   s*   
z_HMACContext.__init__returnc                 C   s   | j S N)r
   )r   r   r   r   r	   *   s   z_HMACContext.algorithmc                 C   sp   | j j }| j || j jjk | j j|| j jj}| j j|| j	}| j |dk t
| j | j| j|dS )Nr   )r   )r   r   r   r   r   r   r   r   ZHMAC_CTX_copyr   r   r   r	   )r   Z
copied_ctxr   r   r   r   copy.   s   
z_HMACContext.copydatac                 C   s:   | j j|}| j j| j|t|}| j |dk d S )Nr   )r   r   r   r   ZHMAC_Updater   r   r   )r   r#   Zdata_ptrr   r   r   r   update:   s   z_HMACContext.updatec                 C   sz   | 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 )Nzunsigned char[]zunsigned int *r   )r   r   newr   ZEVP_MAX_MD_SIZEZ
HMAC_Finalr   r   r	   digest_sizebuffer)r   bufZoutlenr   r   r   r   finalize?   s   
z_HMACContext.finalize	signaturec                 C   s    |   }t||stdd S )NzSignature did not match digest.)r)   r   Zbytes_eqr   )r   r*   digestr   r   r   verifyI   s   z_HMACContext.verifyr!   )r    r   )__name__
__module____qualname__bytesr   ZHashAlgorithmr   propertyr	   r"   r$   r)   r,   r   r   r   r   r      s    


r   N)	Zcryptography.exceptionsr   r   r   Zcryptography.hazmat.primitivesr   r   ZHashContextr   r   r   r   r   <module>   s   