o
    Ïó·i~   ã                   @  sf  d dl mZ d dlZd dlmZ d dlmZmZ d dlm	Z	m
Z
 d dlmZ G dd„ dejd	�ZG d
d„ deejd	�ZG dd„ deejd	�ZG dd„ deejd	�ZG dd„ deejd	�Zd4dd„Zd5dd„Zd6d d!„Zd7d"d#„ZG d$d%„ d%eƒZG d&d'„ d'eƒZG d(d)„ d)eƒZG d*d+„ d+eƒZG d,d-„ d-eƒZG d.d/„ d/eƒZG d0d1„ d1eƒZG d2d3„ d3eeƒZdS )8é    )ÚannotationsN)Úutils)ÚUnsupportedAlgorithmÚ_Reasons)ÚBlockCipherAlgorithmÚCipherAlgorithm)Ú
algorithmsc                   @  s0   e Zd Zeejddd„ƒƒZejddd	„ƒZd
S )ÚModeÚreturnÚstrc                 C  ó   dS )z@
        A string naming this mode (e.g. "ECB", "CBC").
        N© ©Úselfr   r   úrC:\Users\psant\Downloads\PAF backend\school\venv\Lib\site-packages\cryptography/hazmat/primitives/ciphers/modes.pyÚname   ó    z	Mode.nameÚ	algorithmr   ÚNonec                 C  r   )zq
        Checks that all the necessary invariants of this (mode, algorithm)
        combination are met.
        Nr   ©r   r   r   r   r   Úvalidate_for_algorithm   r   zMode.validate_for_algorithmN)r
   r   ©r   r   r
   r   )Ú__name__Ú
__module__Ú__qualname__ÚpropertyÚabcÚabstractmethodr   r   r   r   r   r   r	      s    r	   )Ú	metaclassc                   @  ó    e Zd Zeejddd„ƒƒZdS )ÚModeWithInitializationVectorr
   úutils.Bufferc                 C  r   )zP
        The value of the initialization vector for this mode as bytes.
        Nr   r   r   r   r   Úinitialization_vector#   r   z2ModeWithInitializationVector.initialization_vectorN©r
   r!   )r   r   r   r   r   r   r"   r   r   r   r   r    "   ó    r    c                   @  r   )ÚModeWithTweakr
   r!   c                 C  r   )z@
        The value of the tweak for this mode as bytes.
        Nr   r   r   r   r   Útweak,   r   zModeWithTweak.tweakNr#   )r   r   r   r   r   r   r&   r   r   r   r   r%   +   r$   r%   c                   @  r   )ÚModeWithNoncer
   r!   c                 C  r   )z@
        The value of the nonce for this mode as bytes.
        Nr   r   r   r   r   Únonce5   r   zModeWithNonce.nonceNr#   )r   r   r   r   r   r   r(   r   r   r   r   r'   4   r$   r'   c                   @  r   )ÚModeWithAuthenticationTagr
   úbytes | Nonec                 C  r   )zP
        The value of the tag supplied to the constructor of this mode.
        Nr   r   r   r   r   Útag>   r   zModeWithAuthenticationTag.tagN©r
   r*   )r   r   r   r   r   r   r+   r   r   r   r   r)   =   r$   r)   r   r   r   r
   r   c                 C  s$   |j dkr|jdkrtdƒ‚d S d S )Né   ZAESz=Only 128, 192, and 256 bit keys are allowed for this AES mode)Úkey_sizer   Ú
ValueErrorr   r   r   r   Ú_check_aes_key_lengthF   s
   ÿÿr0   r   c                 C  s4   t | jƒ}|d |jkrtd|› d| j› d�ƒ‚d S )Né   zInvalid IV size (ú) for Ú.)Úlenr"   Ú
block_sizer/   r   )r   r   Ziv_lenr   r   r   Ú_check_iv_lengthM   s   
ÿr6   r(   r!   r   r   c                 C  sL   t |tƒst|› d�tjƒ‚t| ƒd |jkr$tdt| ƒ› d|› d�ƒ‚d S )Nú" requires a block cipher algorithmr1   zInvalid nonce size (r2   r3   )Ú
isinstancer   r   r   ÚUNSUPPORTED_CIPHERr4   r5   r/   )r(   r   r   r   r   r   Ú_check_nonce_lengthU   s   
þÿr:   c                 C  s4   t |tƒst| › d�tjƒ‚t| |ƒ t| |ƒ d S )Nr7   )r8   r   r   r   r9   r0   r6   r   r   r   r   Ú_check_iv_and_key_lengtha   s   
þ
r;   c                   @  ó,   e Zd Zd Zd	dd„Zed
dd„ƒZeZdS )ÚCBCr"   r!   c                 C  ó   t  d|¡ || _d S ©Nr"   ©r   Ú_check_byteslikeÚ_initialization_vector©r   r"   r   r   r   Ú__init__p   ó   
zCBC.__init__r
   c                 C  ó   | j S ©N©rB   r   r   r   r   r"   t   ó   zCBC.initialization_vectorN©r"   r!   r#   ©	r   r   r   r   rD   r   r"   r;   r   r   r   r   r   r=   m   ó    
r=   c                   @  ó2   e Zd Zd Zddd„Zeddd„ƒZddd„ZdS )ÚXTSr&   r!   c                 C  s*   t  d|¡ t|ƒdkrtdƒ‚|| _d S )Nr&   é   z!tweak must be 128-bits (16 bytes))r   rA   r4   r/   Ú_tweak)r   r&   r   r   r   rD   ~   s   
zXTS.__init__r
   c                 C  rF   rG   )rP   r   r   r   r   r&   †   rI   z	XTS.tweakr   r   r   c                 C  s0   t |tjtjfƒrtdƒ‚|jdvrtdƒ‚d S )Nz\The AES128 and AES256 classes do not support XTS, please use the standard AES class instead.)r-   i   z\The XTS specification requires a 256-bit key for AES-128-XTS and 512-bit key for AES-256-XTS)r8   r   ZAES128ZAES256Ú	TypeErrorr.   r/   r   r   r   r   r   Š   s   ÿ
ÿÿzXTS.validate_for_algorithmN)r&   r!   r#   r   )r   r   r   r   rD   r   r&   r   r   r   r   r   rN   {   s    
rN   c                   @  s   e Zd Zd ZeZdS )ÚECBN)r   r   r   r   r0   r   r   r   r   r   rR   ˜   s    rR   c                   @  r<   )ÚOFBr"   r!   c                 C  r>   r?   r@   rC   r   r   r   rD   ¡   rE   zOFB.__init__r
   c                 C  rF   rG   rH   r   r   r   r   r"   ¥   rI   zOFB.initialization_vectorNrJ   r#   rK   r   r   r   r   rS   ž   rL   rS   c                   @  r<   )ÚCFBr"   r!   c                 C  r>   r?   r@   rC   r   r   r   rD   ¯   rE   zCFB.__init__r
   c                 C  rF   rG   rH   r   r   r   r   r"   ³   rI   zCFB.initialization_vectorNrJ   r#   rK   r   r   r   r   rT   ¬   rL   rT   c                   @  r<   )ÚCFB8r"   r!   c                 C  r>   r?   r@   rC   r   r   r   rD   ½   rE   zCFB8.__init__r
   c                 C  rF   rG   rH   r   r   r   r   r"   Á   rI   zCFB8.initialization_vectorNrJ   r#   rK   r   r   r   r   rU   º   rL   rU   c                   @  rM   )ÚCTRr(   r!   c                 C  r>   )Nr(   )r   rA   Ú_nonce)r   r(   r   r   r   rD   Ë   rE   zCTR.__init__r
   c                 C  rF   rG   )rW   r   r   r   r   r(   Ï   rI   z	CTR.noncer   r   r   c                 C  s   t | |ƒ t| j| j|ƒ d S rG   )r0   r:   r(   r   r   r   r   r   r   Ó   s   
zCTR.validate_for_algorithmN)r(   r!   r#   r   )r   r   r   r   rD   r   r(   r   r   r   r   r   rV   È   s    
rV   c                   @  sN   e Zd Zd ZdZdZ		dddd„Zeddd„ƒZeddd„ƒZ	ddd„Z
dS )ÚGCMl   àÿ? l            NrO   r"   r!   r+   r*   Úmin_tag_lengthÚintc                 C  s‚   t  d|¡ t|ƒdk st|ƒdkrtdƒ‚|| _|d ur9t  d|¡ |dk r+tdƒ‚t|ƒ|k r9td|› d	�ƒ‚|| _|| _d S )
Nr"   r1   é€   zIinitialization_vector must be between 8 and 128 bytes (64 and 1024 bits).r+   é   zmin_tag_length must be >= 4zAuthentication tag must be z bytes or longer.)r   rA   r4   r/   rB   Z_check_bytesÚ_tagZ_min_tag_length)r   r"   r+   rY   r   r   r   rD   Ý   s    ÿ
ÿ
zGCM.__init__r
   c                 C  rF   rG   )r]   r   r   r   r   r+   ø   rI   zGCM.tagc                 C  rF   rG   rH   r   r   r   r   r"   ü   rI   zGCM.initialization_vectorr   r   r   c                 C  sZ   t | |ƒ t|tƒstdtjƒ‚|jd }| jd ur)t| jƒ|kr+t	d|› d�ƒ‚d S d S )Nz%GCM requires a block cipher algorithmr1   z'Authentication tag cannot be more than z bytes.)
r0   r8   r   r   r   r9   r5   r]   r4   r/   )r   r   Zblock_size_bytesr   r   r   r      s   

þ

ÿÿzGCM.validate_for_algorithm)NrO   )r"   r!   r+   r*   rY   rZ   r,   r#   r   )r   r   r   r   Z_MAX_ENCRYPTED_BYTESZ_MAX_AAD_BYTESrD   r   r+   r"   r   r   r   r   r   rX   Ø   s    ürX   )r   r	   r   r   r
   r   )r   r    r   r   r
   r   )r(   r!   r   r   r   r   r
   r   )r   r    r   r   r
   r   )Ú
__future__r   r   Zcryptographyr   Zcryptography.exceptionsr   r   Z/cryptography.hazmat.primitives._cipheralgorithmr   r   Z&cryptography.hazmat.primitives.ciphersr   ÚABCMetar	   r    r%   r'   r)   r0   r6   r:   r;   r=   rN   rR   rS   rT   rU   rV   rX   r   r   r   r   Ú<module>   s.   			
	


