o
    c#                     @   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   Lusr/lib/python3.10/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dejdedededeje dedeje deje	 d	eje	 d
eje	 fddZ
ededefddZde	dede	fddZde	fddZdS )_KBKDFDeriverprfmodelengthrlenllenlocationbreak_locationlabelcontextfixedc                 C   sl  t |sJ t|tstdt|tstd|d u r%|tju r%td|d ur2|tjkr2td|d ur?t|ts?td|d urK|dk rKtd|sO|	rU|
rUtd|d u s^| |sbtd	|d u rn|
d u rntd
|d ur{t|ts{td|d u rd}|	d u rd}	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__#   sV   



z_KBKDFDeriver.__init__valuereturnc                 C   sB   t | ts	tdtd| }dt|  krdksdS  dS dS )Nzvalue must be of type int      FT)r$   r'   r%   r   int_to_byteslen)r7   Z	value_binr   r   r   r(   l   s   
z _KBKDFDeriver._valid_byte_lengthkey_materialprf_output_sizec                 C   s6  | j rttd| d| _ | j |  }dg}td| j}|tdt|d d kr0t	d| 
 }| jtjkr?d}|}n*| jtjkrJ|}d}nt| jtr[| jt|kr[t	d|d | j }|| jd  }td|d D ] }	| |}
t|	| j}|| | }|
| ||
  qpd|d | j S )	Nr=   Tr"   r9         zThere are too many iterations.z"break_location offset > len(fixed))r3   r   r   _check_bytesliker,   r;   r-   powr<   r&   _generate_fixed_inputr/   r   r   r   r$   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.derivec                 C   sB   | j rt| j tr| j S t| jd | j}d| jd| j	|gS )Nr@   r"       )
r4   r$   bytesr   r;   r,   r.   rH   r1   r2   )r5   Zl_valr   r   r   rC      s   z#_KBKDFDeriver._generate_fixed_inputN)r   r   r   typingCallabler   r'   Optionalr   rP   r6   staticmethodboolr(   rN   rC   r   r   r   r   r   "   s4    	

I	0r   c                   @   s   e Zd Z	ddddejdedededeje de	d	eje
 d
eje
 deje
 dejdeje fddZde
dejfddZde
de
fddZde
de
ddfddZdS )	KBKDFHMACNr   	algorithmr   r   r   r   r   r   r    r!   backendr   c                C   sb   t |tjstdtjddlm} ||stdtj|| _	t
| j|||||||||	
| _d S )Nz5Algorithm supplied is not a supported hash algorithm.r   rY   z5Algorithm supplied is not a supported hmac algorithm.)r$   r
   HashAlgorithmr   r   ZUNSUPPORTED_HASH,cryptography.hazmat.backends.openssl.backendrY   Zhmac_supported
_algorithmr   r*   _deriver)r5   rX   r   r   r   r   r   r   r    r!   rY   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^   rN   r]   digest_sizerb   r   r   r   rN      s   zKBKDFHMAC.deriveexpected_keyc                 C      t | ||std S r`   r	   Zbytes_eqrN   r   r5   r=   rd   r   r   r   verify      zKBKDFHMAC.verifyr`   )r   r   r   r
   r[   r   r'   rQ   rS   r   rP   Anyr6   r   ra   r*   rN   rh   r   r   r   r   rV      s<    	

.rV   c                   @   s   e Zd Z	ddddedededeje dedeje d	eje d
eje dej	deje fddZ
dedejfddZdedefddZdededdfddZdS )	KBKDFCMACNrW   r   r   r   r   r   r   r    r!   rY   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   rX   r   r   r   r   r   r   r    r!   rY   r   r   r   r   r6      s.   

zKBKDFCMAC.__init___r8   c                 C   s   | j d usJ t| j S r`   )ro   r   CMAC)r5   rp   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   rZ   rl   r@   )r]   ro   r\   rY   Zcmac_algorithm_supportedr   r   rn   r^   rN   
block_size)r5   r=   r_   r   r   r   rN     s   zKBKDFCMAC.deriverd   c                 C   re   r`   rf   rg   r   r   r   rh   '  ri   zKBKDFCMAC.verifyr`   )r   r   r   r   r'   rQ   rS   r   rP   rj   r6   r   rq   r*   rN   rh   r   r   r   r   rk      s8    	

'rk   )rQ   cryptographyr   Zcryptography.exceptionsr   r   r   r   Zcryptography.hazmat.primitivesr   r   r	   r
   r   Z"cryptography.hazmat.primitives.kdfr   Enumr   r   r   rV   rk   r   r   r   r   <module>   s    :