o
    e$                     @  s   d dl mZ d dlZd dlmZ d dlmZmZmZm	Z	 d dl
mZmZmZmZmZ d dlmZ G dd dejZG d	d
 d
ejZG dd dZG dd deZG dd deZdS )    )annotationsN)utils)AlreadyFinalized
InvalidKeyUnsupportedAlgorithm_Reasons)cipherscmacconstant_timehasheshmac)KeyDerivationFunctionc                   @  s   e Zd ZdZdS )ModeZctrN)__name__
__module____qualname__ZCounterMode r   r   XD:\Projects\ConvertPro\env\Lib\site-packages\cryptography/hazmat/primitives/kdf/kbkdf.pyr      s    r   c                   @  s   e Zd ZdZdZdZdS )CounterLocationZbefore_fixedZafter_fixedZmiddle_fixedN)r   r   r   BeforeFixed
AfterFixedMiddleFixedr   r   r   r   r      s    r   c                   @  s8   e Zd Zd ddZed!ddZd"ddZd#ddZdS )$_KBKDFDeriverprftyping.Callablemoder   lengthintrlenllentyping.Optional[int]locationr   break_locationlabeltyping.Optional[bytes]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   
ValueErrorr   _valid_byte_lengthr   Z_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returnboolc                 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)r:   Z	value_binr   r   r   r,   n   s   
z _KBKDFDeriver._valid_byte_lengthkey_materialbytes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 )	NrA   Tr'   r=         zThere are too many iterations.z"break_location offset > len(fixed))r6   r   r   Z_check_bytesliker/   r?   r0   powr@   r+   _generate_fixed_inputr2   r   r   r   r)   r3   r   ranger-   updateappendfinalizejoin)r8   rA   rC   roundsoutputZr_binr&   Zdata_before_ctrZdata_after_ctrihcounterZ
input_datar   r   r   derivex   s<   

z_KBKDFDeriver.derivec                 C  sB   | j rt| j tr| j S t| jd | j}d| jd| j	|gS )NrE   r'       )
r7   r)   rB   r   r?   r/   r1   rL   r4   r5   )r8   Zl_valr   r   r   rG      s   z#_KBKDFDeriver._generate_fixed_inputN)r   r   r   r   r   r   r   r   r   r    r!   r   r"   r    r#   r$   r%   r$   r&   r$   )r:   r   r;   r<   )rA   rB   rC   r   r;   rB   )r;   rB   )r   r   r   r9   staticmethodr,   rR   rG   r   r   r   r   r   $   s    
I
	0r   c                   @  s>   e Zd Z	d#ddd$ddZd%ddZd&ddZd'd!d"ZdS )(	KBKDFHMACNr"   	algorithmhashes.HashAlgorithmr   r   r   r   r   r   r    r!   r   r#   r$   r%   r&   backend
typing.Anyr"   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   ZHashAlgorithmr   r   ZUNSUPPORTED_HASH,cryptography.hazmat.backends.openssl.backendrY   Zhmac_supported
_algorithmr   r-   _deriver)r8   rW   r   r   r   r   r!   r#   r%   r&   rY   r"   osslr   r   r   r9      s0   

zKBKDFHMAC.__init__rA   rB   r;   	hmac.HMACc                 C  s   t || jS N)r   HMACr]   r8   rA   r   r   r   r-      s   zKBKDFHMAC._prfc                 C  s   | j || jjS ra   )r^   rR   r]   digest_sizerc   r   r   r   rR      s   zKBKDFHMAC.deriveexpected_keyNonec                 C     t | ||std S ra   r
   Zbytes_eqrR   r   r8   rA   re   r   r   r   verify      zKBKDFHMAC.verifyra   )rW   rX   r   r   r   r   r   r   r   r    r!   r   r#   r$   r%   r$   r&   r$   rY   rZ   r"   r    )rA   rB   r;   r`   rA   rB   r;   rB   rA   rB   re   rB   r;   rf   r   r   r   r9   r-   rR   rj   r   r   r   r   rU      s    
.
rU   c                   @  s>   e Zd Z	d"ddd#ddZd$ddZd%ddZd&d d!ZdS )'	KBKDFCMACNrV   r   r   r   r   r   r   r    r!   r   r#   r$   r%   r&   rY   rZ   r"   c                C  sR   t |tjrt |tjstdtj|| _d | _t	| j
|||||||||	
| _d S )N7Algorithm supplied is not a supported cipher algorithm.)
issubclassr   ZBlockCipherAlgorithmZCipherAlgorithmr   r   UNSUPPORTED_CIPHERr]   _cipherr   r-   r^   )r8   rW   r   r   r   r   r!   r#   r%   r&   rY   r"   r   r   r   r9      s.   

zKBKDFCMAC.__init___rB   r;   	cmac.CMACc                 C  s   | j d usJ t| j S ra   )rs   r	   ZCMAC)r8   rt   r   r   r   r-     s   zKBKDFCMAC._prfrA   c                 C  sT   |  || _| jd usJ ddlm} || jstdtj| j	|| jj
d S )Nr   r[   rp   rE   )r]   rs   r\   rY   Zcmac_algorithm_supportedr   r   rr   r^   rR   
block_size)r8   rA   r_   r   r   r   rR     s   zKBKDFCMAC.derivere   rf   c                 C  rg   ra   rh   ri   r   r   r   rj   )  rk   zKBKDFCMAC.verifyra   )r   r   r   r   r   r   r   r    r!   r   r#   r$   r%   r$   r&   r$   rY   rZ   r"   r    )rt   rB   r;   ru   rl   rm   rn   r   r   r   r   ro      s    
'
ro   )
__future__r   typingZcryptographyr   Zcryptography.exceptionsr   r   r   r   Zcryptography.hazmat.primitivesr   r	   r
   r   r   Z"cryptography.hazmat.primitives.kdfr   Enumr   r   r   rU   ro   r   r   r   r   <module>   s    :