U
    
;g#                     @  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   L/tmp/pip-unpacked-wheel-yjz0rwd7/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dddddddddd
dd	Zedd
dddZddddddZddddZdS )_KBKDFDeriverztyping.Callabler   int
int | Noner   bytes | None)
prfmodelengthrlenllenlocationbreak_locationlabelcontextfixedc                 C  s  t |stt|tstdt|ts0td|d krJ|tjkrJtd|d k	rd|tjkrdtd|d k	r~t|ts~td|d k	r|dk rtd|s|	r|
rtd|d ks| 	|std	|d kr|
d krtd
|d k	rt|tstd|dkrtd|d krd}|	d kr$d}	t
d| t
d|	 || _|| _|| _|| _|| _|| _|| _|| _|	| _d| _|
| _d S )Nzmode must be of type Modez(location must be of type CounterLocationzPlease specify a break_locationzJbreak_location is ignored when location is not CounterLocation.MiddleFixedz!break_location must be an integerr   z)break_location must be a positive integerz9When supplying fixed data, label and context are ignored.zrlen must be between 1 and 4zPlease specify an llenzllen must be an integerzllen must be non-zero    r#   r$   F)callableAssertionError
isinstancer   	TypeErrorr   r   
ValueErrorr   _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$   r%   r   r   r   __init__%   s^    




z_KBKDFDeriver.__init__bool)valuereturnc                 C  s@   t | tstdtd| }dt|  kr6dks<n dS dS )Nzvalue must be of type int      FT)r)   r   r*   r   int_to_byteslen)r<   Z	value_binr   r   r   r,   q   s    
z _KBKDFDeriver._valid_byte_lengthbytes)key_materialprf_output_sizer=   c                 C  s6  | j r
ttd| d| _ | j |  }dg}td| j}|tdt|d d kr`t	d| 
 }| jtjkr~d}|}nT| jtjkr|}d}n>t| jtr| jt|krt	d|d | j }|| jd  }td|d D ]@}	| |}
t|	| j}|| | }|
| ||
  qd|d | j S )	NrC   Tr&   r>         zThere are too many iterations.z"break_location offset > len(fixed))r7   r   r   Z_check_bytesliker0   r@   r1   powrA   r+   _generate_fixed_inputr3   r   r   r   r)   r4   r   ranger.   updateappendfinalizejoin)r9   rC   rD   roundsoutputZr_binr%   Zdata_before_ctrZdata_after_ctrihcounterZ
input_datar   r   r   derive{   s@     

z_KBKDFDeriver.derive)r=   c                 C  sB   | j rt| j tr| j S t| jd | j}d| jd| j	|gS )NrF   r&       )
r8   r)   rB   r   r@   r0   r2   rM   r5   r6   )r9   Zl_valr   r   r   rH      s    z#_KBKDFDeriver._generate_fixed_inputN)r   r   r   r:   staticmethodr,   rS   rH   r   r   r   r   r   $   s
    L	0r   c                   @  sh   e Zd Zddddddddddddd	dd
ddZdddddZdddddZddddddZdS )	KBKDFHMACNr"   zhashes.HashAlgorithmr   r   r   r   r   
typing.Any)	algorithmr   r   r   r    r!   r#   r$   r%   backendr"   c                C  sb   t |tjstdtjddlm} ||s:tdtj|| _	t
| j|||||||||	
| _d S )Nz5Algorithm supplied is not a supported hash algorithm.r   rZ   z5Algorithm supplied is not a supported hmac algorithm.)r)   r   ZHashAlgorithmr   r   ZUNSUPPORTED_HASH,cryptography.hazmat.backends.openssl.backendrZ   Zhmac_supported
_algorithmr   r.   _deriver)r9   rY   r   r   r   r    r!   r#   r$   r%   rZ   r"   osslr   r   r   r:      s0    
zKBKDFHMAC.__init__rB   z	hmac.HMACrC   r=   c                 C  s   t || jS N)r   HMACr]   r9   rC   r   r   r   r.      s    zKBKDFHMAC._prfc                 C  s   | j || jjS ra   )r^   rS   r]   digest_sizerc   r   r   r   rS      s    zKBKDFHMAC.deriveNonerC   expected_keyr=   c                 C  s   t | ||std S ra   r
   Zbytes_eqrS   r   r9   rC   rg   r   r   r   verify   s    zKBKDFHMAC.verify)Nr   r   r   r:   r.   rS   rj   r   r   r   r   rV      s    &.rV   c                   @  sf   e Zd Zdddddddddddddd	
d
dZdddddZdddddZddddddZdS )	KBKDFCMACNrW   r   r   r   r   r   rX   )
r   r   r   r    r!   r#   r$   r%   rZ   r"   c                C  sR   t |tjrt |tjs$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^   )r9   rY   r   r   r   r    r!   r#   r$   r%   rZ   r"   r   r   r   r:      s0     
zKBKDFCMAC.__init__rB   z	cmac.CMAC)_r=   c                 C  s   | j d k	stt| j S ra   )rp   r(   r	   ZCMAC)r9   rq   r   r   r   r.     s    zKBKDFCMAC._prfr`   c                 C  sT   |  || _| jd k	stddlm} || js>tdtj| j	
|| jjd S )Nr   r[   rm   rF   )r]   rp   r(   r\   rZ   Zcmac_algorithm_supportedr   r   ro   r^   rS   
block_size)r9   rC   r_   r   r   r   rS     s    zKBKDFCMAC.derivere   rf   c                 C  s   t | ||std S ra   rh   ri   r   r   r   rj   ,  s    zKBKDFCMAC.verify)Nrk   r   r   r   r   rl      s    $'rl   )
__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   rV   rl   r   r   r   r   <module>   s    :