a
    ݌xd#                     @   s   d dl Z d dlmZ d dlmZmZmZmZ d dlm	Z	m
Z
mZmZmZ d dlmZ G dd dejZG dd	 d	ejZG d
d dZG dd deZG dd deZdS )    N)utils)AlreadyFinalized
InvalidKeyUnsupportedAlgorithm_Reasons)cipherscmacconstant_timehasheshmac)KeyDerivationFunctionc                   @   s   e Zd ZdZdS )ModeZctrN)__name__
__module____qualname__ZCounterMode r   r   `/var/www/html/Ranjet/env/lib/python3.9/site-packages/cryptography/hazmat/primitives/kdf/kbkdf.pyr      s   r   c                   @   s   e Zd ZdZdZdZdS )CounterLocationZbefore_fixedZafter_fixedZmiddle_fixedN)r   r   r   BeforeFixed
AfterFixedMiddleFixedr   r   r   r   r      s   r   c                   @   s   e Zd Zejeeeeje eeje eje	 eje	 eje	 d
ddZ
eeedddZe	ee	ddd	Ze	d
ddZdS )_KBKDFDeriver)
prfmodelengthrlenllenlocationbreak_locationlabelcontextfixedc                 C   sp  t |sJ t|tstdt|ts0td|d u rJ|tju rJtd|d urd|tjkrdtd|d ur~t|ts~td|d ur|dk rtd|s|	r|
rtd|d u s| |std	|d u r|
d u rtd
|d urt|tstd|d u rd}|	d u rd}	t	
d| t	
d|	 || _|| _|| _|| _|| _|| _|| _|| _|	| _d| _|
| _d S )Nzmode must be of type Modez(location must be of type CounterLocationzPlease specify a break_locationzJbreak_location is ignored when location is not CounterLocation.MiddleFixedz!break_location must be an integerr   z)break_location must be a positive integerz9When supplying fixed data, label and context are ignored.zrlen must be between 1 and 4zPlease specify an llenzllen must be an integer    r   r    F)callable
isinstancer   	TypeErrorr   r   
ValueErrorint_valid_byte_lengthr   _check_bytes_prf_mode_length_rlen_llen	_location_break_location_label_context_used_fixed_data)selfr   r   r   r   r   r   r   r   r    r!   r   r   r   __init__#   sZ    



z_KBKDFDeriver.__init__)valuereturnc                 C   s@   t | tstdtd| }dt|  kr6dks<n dS dS )Nzvalue must be of type int      FT)r$   r'   r%   r   int_to_byteslen)r7   Z	value_binr   r   r   r(   l   s    
z _KBKDFDeriver._valid_byte_length)key_materialprf_output_sizer8   c                 C   s6  | j r
ttd| d| _ | j |  }dg}td| j}|tdt|d d kr`t	d| 
 }| jtjkr~d}|}nT| jtjkr|}d}n>t| jtr| jt|krt	d|d | j }|| jd  }td|d D ]@}	| |}
t|	| j}|| | }|
| ||
  qd|d | j S )	Nr=   Tr"   r9         zThere are too many iterations.z"break_location offset > len(fixed))r3   r   r   Z_check_bytesliker,   r;   r-   powr<   r&   _generate_fixed_inputr/   r   r   r   r$   r0   r'   ranger*   updateappendfinalizejoin)r5   r=   r>   roundsoutputZr_binr!   Zdata_before_ctrZdata_after_ctrihcounterZ
input_datar   r   r   derivev   s>    

z_KBKDFDeriver.derive)r8   c                 C   sB   | j rt| j tr| j S t| jd | j}d| jd| j	|gS )Nr@   r"       )
r4   r$   bytesr   r;   r,   r.   rG   r1   r2   )r5   Zl_valr   r   r   rB      s    z#_KBKDFDeriver._generate_fixed_inputN)r   r   r   typingCallabler   r'   Optionalr   rO   r6   staticmethodboolr(   rM   rB   r   r   r   r   r   "   s   I	0r   c                   @   s   e Zd Zdddejeeeeje e	eje
 eje
 eje
 ejeje dddZe
ejdddZe
e
dd	d
Ze
e
ddddZdS )	KBKDFHMACNr   )	algorithmr   r   r   r   r   r   r    r!   backendr   c                C   sb   t |tjstdtjddlm} ||s:tdtj|| _	t
| j|||||||||	
| _d S )Nz5Algorithm supplied is not a supported hash algorithm.r   rX   z5Algorithm supplied is not a supported hmac algorithm.)r$   r
   HashAlgorithmr   r   ZUNSUPPORTED_HASH,cryptography.hazmat.backends.openssl.backendrX   Zhmac_supported
_algorithmr   r*   _deriver)r5   rW   r   r   r   r   r   r   r    r!   rX   r   osslr   r   r   r6      s0    
zKBKDFHMAC.__init__r=   r8   c                 C   s   t || jS N)r   HMACr\   r5   r=   r   r   r   r*      s    zKBKDFHMAC._prfc                 C   s   | j || jjS r`   )r]   rM   r\   digest_sizerb   r   r   r   rM      s    zKBKDFHMAC.deriver=   expected_keyr8   c                 C   s   t | ||std S r`   r	   Zbytes_eqrM   r   r5   r=   re   r   r   r   verify   s    zKBKDFHMAC.verify)N)r   r   r   r
   rZ   r   r'   rP   rR   r   rO   Anyr6   r   ra   r*   rM   rh   r   r   r   r   rU      s&    .rU   c                   @   s   e Zd Zdddeeeeje eeje eje eje ej	eje d
ddZ
eejdddZeed	d
dZeeddddZdS )	KBKDFCMACNrV   )
r   r   r   r   r   r   r    r!   rX   r   c                C   sR   t |tjrt |tjs$tdtj|| _d | _t	| j
|||||||||	
| _d S )N7Algorithm supplied is not a supported cipher algorithm.)
issubclassr   ZBlockCipherAlgorithmZCipherAlgorithmr   r   UNSUPPORTED_CIPHERr\   _cipherr   r*   r]   )r5   rW   r   r   r   r   r   r   r    r!   rX   r   r   r   r   r6      s.    
zKBKDFCMAC.__init__)_r8   c                 C   s   | j d usJ t| j S r`   )rn   r   CMAC)r5   ro   r   r   r   r*     s    zKBKDFCMAC._prfr_   c                 C   sT   |  || _| jd usJ ddlm} || js>tdtj| j	|| jj
d S )Nr   rY   rk   r@   )r\   rn   r[   rX   Zcmac_algorithm_supportedr   r   rm   r]   rM   
block_size)r5   r=   r^   r   r   r   rM     s    zKBKDFCMAC.deriverd   c                 C   s   t | ||std S r`   rf   rg   r   r   r   rh   '  s    zKBKDFCMAC.verify)N)r   r   r   r   r'   rP   rR   r   rO   ri   r6   r   rp   r*   rM   rh   r   r   r   r   rj      s$    'rj   )rP   Zcryptographyr   Zcryptography.exceptionsr   r   r   r   Zcryptography.hazmat.primitivesr   r   r	   r
   r   Z"cryptography.hazmat.primitives.kdfr   Enumr   r   r   rU   rj   r   r   r   r   <module>   s    :