o
    cf(                     @   s\   d dl Z d dlmZmZmZ d dlmZ d dlmZm	Z	 e j
r%d dlmZ G dd dZdS )    N)
InvalidTagUnsupportedAlgorithm_Reasons)ciphers)
algorithmsmodes)Backendc                   @   s   e Zd ZdZdZdZdddeddfd	d
Z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edefddZdeddfddZedeje fddZdS )_CipherContext   r   i?backendr   	operationreturnNc                 C   s8  || _ || _|| _|| _d | _t| jtjr| jjd | _	nd| _	| j j
 }| j j|| j j
j}| j j}z|t|t|f }W n tyY   td|j|rS|jn|tjw || j ||}|| j jjkrd|}	|d urx|	d|7 }	|	d| j  7 }	t|	tjt|tjr| j j|j}
n2t|tjr| j j|j}
n#t|tjr| j j|j }
nt|t!j"r| j j|j }
n| j jj}
| j j
#||| j jj| j jj| j jj|}| j $|dk | j j
%|t&|j'}| j $|dk t|tj(r=| j j
)|| j j
j*t&|
| j jj}| j $|dk |j+d ur=| j j
)|| j j
j,t&|j+|j+}| j $|dk |j+| _| j j
#|| j jj| j jj| j j|j'|
|}| j - }| j j
}|dkr|j.rr|d /|j0|j1s|j2r|d /|j3|j4rt5d| j j$|dk|d	 | j j
6|d || _7d S )
N   r
   z6cipher {} in {} mode is not supported by this backend.zcipher {0.name} zin {0.name} mode z_is not supported by this backend (Your version of OpenSSL may be too old. Current version: {}.)r   z+In XTS mode duplicated keys are not allowederrors)8_backendZ_cipher_mode
_operation_tag
isinstancer   ZBlockCipherAlgorithm
block_size_block_size_bytes_libZEVP_CIPHER_CTX_new_ffigcZEVP_CIPHER_CTX_freeZ_cipher_registrytypeKeyErrorr   formatnamer   ZUNSUPPORTED_CIPHERNULLZopenssl_version_textr   ZModeWithInitializationVectorfrom_bufferZinitialization_vectorZModeWithTweakZtweakZModeWithNonceZnoncer   ZChaCha20ZEVP_CipherInit_exopenssl_assertZEVP_CIPHER_CTX_set_key_lengthlenkeyGCMEVP_CIPHER_CTX_ctrlZEVP_CTRL_AEAD_SET_IVLENtagEVP_CTRL_AEAD_SET_TAG_consume_errorsZ$CRYPTOGRAPHY_OPENSSL_111D_OR_GREATER_lib_reason_matchERR_LIB_EVPZEVP_R_XTS_DUPLICATED_KEYSCryptography_HAS_PROVIDERSERR_LIB_PROVZPROV_R_XTS_DUPLICATED_KEYS
ValueErrorZEVP_CIPHER_CTX_set_padding_ctx)selfr   Zciphermoder   ctxregistryadapterZ
evp_ciphermsgZiv_nonceresr   lib r7   Pusr/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/ciphers.py__init__   s   
	





	
z_CipherContext.__init__datac                 C   s2   t t|| j d }| ||}t|d | S )Nr
   )	bytearrayr"   r   update_intobytes)r/   r:   bufnr7   r7   r8   update   s   z_CipherContext.updater>   c                 C   s  t |}t ||| j d k rtdt || j d d}d}| jjd}| jj|}| jj|}||kr|| }	|| }
t| j	|| }| jj
| j|	||
|}|dkrjt| jtjrj| j  td| j|dk ||7 }||d 7 }||ks:|S )Nr
   z1buffer must be at least {} bytes for this payloadr   int *zeIn XTS mode you must supply at least a full block in the first update call. For AES this is 16 bytes.)r"   r   r-   r   r   r   newr    min_MAX_CHUNK_SIZEr   EVP_CipherUpdater.   r   r   r   ZXTSr(   r!   )r/   r:   r>   Ztotal_data_lenZdata_processedZ	total_outoutlenZ
baseoutbufZ	baseinbufZoutbufZinbufZinlenr5   r7   r7   r8   r<      s8   
z_CipherContext.update_intoc                 C   s  | j | jkrt| jtjr| jd u rtd| jj	
d| j}| jj	
d}| jj| j||}|dkrt| j }|sDt| jtjrDt| jj}| jj|d |j|jpl|joa|d |j|jpl|jol|d j|jk|d tdt| jtjr| j | jkr| jj	
d| j}| jj| j| jjj| j|}| j|dk | jj	|d d  | _ | jj!| j}| j|dk | jj	|d |d  S )Nz4Authentication tag must be provided when decrypting.zunsigned char[]rA   r   r   zFThe length of the provided data is not a multiple of the block length.r
   )"r   _DECRYPTr   r   r   ZModeWithAuthenticationTagr&   r-   r   r   rB   r   r   ZEVP_CipherFinal_exr.   r(   r$   r   r!   r)   r*   Z'EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTHr+   r,   ZPROV_R_WRONG_FINAL_BLOCK_LENGTHZCRYPTOGRAPHY_IS_BORINGSSLreasonZ*CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH_ENCRYPTr%   ZEVP_CTRL_AEAD_GET_TAGbufferr   ZEVP_CIPHER_CTX_reset)r/   r>   rF   r5   r   r6   Ztag_bufr7   r7   r8   finalize   sh   

z_CipherContext.finalizer&   c                 C   s~   t |}|| jjk rtd| jj|| jkr td| j| jj| j	| jjj
t ||}| j|dk || _|  S )Nz.Authentication tag must be {} bytes or longer.z0Authentication tag cannot be more than {} bytes.r   )r"   r   Z_min_tag_lengthr-   r   r   r   r   r%   r.   r'   r!   r   rK   )r/   r&   Ztag_lenr5   r7   r7   r8   finalize_with_tag   s&   
z _CipherContext.finalize_with_tagc                 C   sN   | j jd}| j j| j| j jj|| j j|t|}| j 	|dk d S )NrA   r   )
r   r   rB   r   rE   r.   r   r    r"   r!   )r/   r:   rF   r5   r7   r7   r8   authenticate_additional_data  s   z+_CipherContext.authenticate_additional_datac                 C   s   | j S )N)r   )r/   r7   r7   r8   r&     s   z_CipherContext.tag)__name__
__module____qualname__rI   rG   rD   intr9   r=   r@   r<   rK   rL   rM   propertytypingOptionalr&   r7   r7   r7   r8   r	      s$    
{#@r	   )rS   Zcryptography.exceptionsr   r   r   Zcryptography.hazmat.primitivesr   Z&cryptography.hazmat.primitives.ciphersr   r   TYPE_CHECKINGZ,cryptography.hazmat.backends.openssl.backendr   r	   r7   r7   r7   r8   <module>   s   