U
    üS‚gº#  ã                   @  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ƒZG d	d
„ d
ejƒZG dd„ dƒZG dd„ deƒZG dd„ deƒZdS )é    )ÚannotationsN)Úutils)ÚAlreadyFinalizedÚ
InvalidKeyÚUnsupportedAlgorithmÚ_Reasons)ÚciphersÚcmacÚconstant_timeÚhashesÚhmac)ÚKeyDerivationFunctionc                   @  s   e Zd ZdZdS )ÚModeZctrN)Ú__name__Ú
__module__Ú__qualname__ZCounterMode© r   r   úL/tmp/pip-unpacked-wheel-xwsikbwl/cryptography/hazmat/primitives/kdf/kbkdf.pyr      s   r   c                   @  s   e Zd ZdZdZdZdS )ÚCounterLocationZbefore_fixedZafter_fixedZmiddle_fixedN)r   r   r   ÚBeforeFixedÚ
AfterFixedÚMiddleFixedr   r   r   r   r      s   r   c                   @  s`   e Zd Zdddddddddddœ
dd	„Zedd
dœdd„ƒZddddœdd„Zddœdd„ZdS )Ú_KBKDFDeriverztyping.Callabler   Úintú
int | Noner   úbytes | None)
ÚprfÚmodeÚlengthÚrlenÚllenÚlocationÚbreak_locationÚlabelÚcontextÚfixedc                 C  s‚  t |ƒst‚t|tƒstdƒ‚t|tƒs0tdƒ‚|d krJ|tjkrJtdƒ‚|d k	rd|tjkrdtdƒ‚|d k	r~t|tƒs~tdƒ‚|d k	r–|dk r–tdƒ‚|sž|	rª|
rªtdƒ‚|d ks¼|  	|¡sÄtd	ƒ‚|d krÜ|
d krÜtd
ƒ‚|d k	röt|tƒsötdƒ‚|dk�rtdƒ‚|d k�rd}|	d k�r$d}	t
 d|¡ t
 d|	¡ || _|| _|| _|| _|| _|| _|| _|| _|	| _d| _|
| _d S )Nzmode must be of type Modez(location must be of type CounterLocationzPlease specify a break_locationzJbreak_location is ignored when location is not CounterLocation.MiddleFixedz!break_location must be an integerr   z)break_location must be a positive integerz9When supplying fixed data, label and context are ignored.zrlen must be between 1 and 4zPlease specify an llenzllen must be an integerzllen must be non-zeroó    r#   r$   F)ÚcallableÚAssertionErrorÚ
isinstancer   Ú	TypeErrorr   r   Ú
ValueErrorr   Ú_valid_byte_lengthr   Ú_check_bytesÚ_prfÚ_modeÚ_lengthÚ_rlenÚ_llenÚ	_locationÚ_break_locationÚ_labelÚ_contextÚ_usedÚ_fixed_data)Úselfr   r   r   r   r    r!   r"   r#   r$   r%   r   r   r   Ú__init__%   s^    

ÿþÿÿ


z_KBKDFDeriver.__init__Úbool)ÚvalueÚreturnc                 C  s@   t | tƒstdƒ‚t d| ¡}dt|ƒ  kr6dks<n dS dS )Nzvalue must be of type inté   é   FT)r)   r   r*   r   Úint_to_bytesÚlen)r<   Z	value_binr   r   r   r,   q   s    
z _KBKDFDeriver._valid_byte_lengthÚbytes)Úkey_materialÚprf_output_sizer=   c                 C  s6  | j r
t‚t d|¡ d| _ | j |  }dg}t d| j¡}|tdt|ƒd ƒd kr`t	dƒ‚|  
¡ }| jtjkr~d}|}nT| jtjkr”|}d}n>t| jtƒr¶| jt|ƒkr¶t	dƒ‚|d | j… }|| jd … }td|d ƒD ]@}	|  |¡}
t |	| j¡}|| | }|
 |¡ | |
 ¡ ¡ qàd |¡d | j… S )	NrC   Tr&   r>   é   é   zThere are too many iterations.z"break_location offset > len(fixed))r7   r   r   Z_check_bytesliker0   r@   r1   ÚpowrA   r+   Ú_generate_fixed_inputr3   r   r   r   r)   r4   r   Úranger.   ÚupdateÚappendÚfinalizeÚjoin)r9   rC   rD   ÚroundsÚoutputZr_binr%   Zdata_before_ctrZdata_after_ctrÚiÚhÚcounterZ
input_datar   r   r   Úderive{   s@     ÿþ

z_KBKDFDeriver.derive)r=   c                 C  sB   | j rt| j tƒr| j S t | jd | j¡}d | jd| j	|g¡S )NrF   r&   ó    )
r8   r)   rB   r   r@   r0   r2   rM   r5   r6   )r9   Zl_valr   r   r   rH   «   s    z#_KBKDFDeriver._generate_fixed_inputN)r   r   r   r:   Ústaticmethodr,   rS   rH   r   r   r   r   r   $   s
    L	0r   c                   @  sh   e Zd Zdddœdddddddddd	dd
œdd„Zdddœdd„Zdddœdd„Zddddœdd„ZdS )Ú	KBKDFHMACN©r"   zhashes.HashAlgorithmr   r   r   r   r   ú
typing.Any)Ú	algorithmr   r   r   r    r!   r#   r$   r%   Úbackendr"   c                C  sb   t |tjƒstdtjƒ‚ddlm} | |¡s:tdtjƒ‚|| _	t
| j|||||||||	ƒ
| _d S )Nz5Algorithm supplied is not a supported hash algorithm.r   ©rZ   z5Algorithm supplied is not a supported hmac algorithm.)r)   r   ZHashAlgorithmr   r   ZUNSUPPORTED_HASHÚ,cryptography.hazmat.backends.openssl.backendrZ   Zhmac_supportedÚ
_algorithmr   r.   Ú_deriver)r9   rY   r   r   r   r    r!   r#   r$   r%   rZ   r"   Úosslr   r   r   r:   µ   s0    þ
þözKBKDFHMAC.__init__rB   z	hmac.HMAC©rC   r=   c                 C  s   t  || j¡S ©N)r   ÚHMACr]   ©r9   rC   r   r   r   r.   ã   s    zKBKDFHMAC._prfc                 C  s   | j  || jj¡S ra   )r^   rS   r]   Údigest_sizerc   r   r   r   rS   æ   s    zKBKDFHMAC.deriveÚNone©rC   Úexpected_keyr=   c                 C  s   t  |  |¡|¡st‚d S ra   ©r
   Zbytes_eqrS   r   ©r9   rC   rg   r   r   r   Úverifyé   s    zKBKDFHMAC.verify)N©r   r   r   r:   r.   rS   rj   r   r   r   r   rV   ´   s    õó&.rV   c                   @  sf   e Zd Zdddœddddddddddd	œ
d
d„Zdddœdd„Zdddœdd„Zddddœdd„ZdS )Ú	KBKDFCMACNrW   r   r   r   r   r   rX   )
r   r   r   r    r!   r#   r$   r%   rZ   r"   c                C  sR   t |tjƒrt |tjƒs$tdtjƒ‚|| _d | _t	| j
|||||||||	ƒ
| _d S )Nú7Algorithm supplied is not a supported cipher algorithm.)Ú
issubclassr   ZBlockCipherAlgorithmZCipherAlgorithmr   r   ÚUNSUPPORTED_CIPHERr]   Ú_cipherr   r.   r^   )r9   rY   r   r   r   r    r!   r#   r$   r%   rZ   r"   r   r   r   r:   ï   s0     ÿ
þþözKBKDFCMAC.__init__rB   z	cmac.CMAC)Ú_r=   c                 C  s   | j d k	st‚t | j ¡S ra   )rp   r(   r	   ZCMAC)r9   rq   r   r   r   r.     s    zKBKDFCMAC._prfr`   c                 C  sT   |   |¡| _| jd k	st‚ddlm} | | j¡s>tdtjƒ‚| j	 
|| jjd ¡S )Nr   r[   rm   rF   )r]   rp   r(   r\   rZ   Zcmac_algorithm_supportedr   r   ro   r^   rS   Ú
block_size)r9   rC   r_   r   r   r   rS     s    þzKBKDFCMAC.derivere   rf   c                 C  s   t  |  |¡|¡st‚d S ra   rh   ri   r   r   r   rj   ,  s    zKBKDFCMAC.verify)Nrk   r   r   r   r   rl   î   s    õó$'rl   )Ú
__future__r   ÚtypingZcryptographyr   Zcryptography.exceptionsr   r   r   r   Zcryptography.hazmat.primitivesr   r	   r
   r   r   Z"cryptography.hazmat.primitives.kdfr   ÚEnumr   r   r   rV   rl   r   r   r   r   Ú<module>   s    :