o
    c                     @   sT   d dl Z d dlmZmZmZ d dlmZmZ e jrd dl	m
Z
 G dd dejZdS )    N)InvalidSignatureUnsupportedAlgorithm_Reasons)constant_timehashes)Backendc                   @   sx   e Zd Z	dd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backendr   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)selfr	   r
   r   ctxZevp_mdZkey_ptrres r   Musr/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   3   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   copy7   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   updateC   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   finalizeH   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   verifyR   s   z_HMACContext.verifyr"   )r!   r   )__name__
__module____qualname__bytesr   ZHashAlgorithmr    propertyr   r#   r%   r*   r-   r   r   r   r   r      s    


r   )typingZcryptography.exceptionsr   r   r   Zcryptography.hazmat.primitivesr   r   TYPE_CHECKINGZ,cryptography.hazmat.backends.openssl.backendr   ZHashContextr   r   r   r   r   <module>   s   