/
lib
/
python3
/
dist-packages
/
cryptography
/
hazmat
/
backends
/
openssl
/
__pycache__
/
Upload File
HOME
� p�g� � �z � d dl Z d dlmZmZmZ d dlmZ d dlmZ e j r d dlm Z d dl m Z G d� d� � Z dS ) � N)�InvalidSignature�UnsupportedAlgorithm�_Reasons)� constant_time)�CBC)�ciphers)�Backendc �X � e Zd Z d dd�Zdeddfd �Zdefd �Zdd �Zd eddfd �ZdS )� _CMACContextN�backendr � algorithm� ciphers.BlockCipherAlgorithm�returnc �H � |� |� � st dt j � � �|| _ |j | _ || _ |j dz | _ |��?| j j }|t |� � t f } || j |t � � }| j j � � � }| j � || j j j k � � | j j � || j j j � � }| j j � | j � � }| j j � ||t- | j � � || j j j � � }| j � |dk � � || _ d S )Nz#This backend does not support CMAC.� � )�cmac_algorithm_supportedr r �UNSUPPORTED_CIPHER�_backend�key�_key� _algorithm� block_size�_output_length�_cipher_registry�typer �_lib� CMAC_CTX_new�openssl_assert�_ffi�NULL�gc� CMAC_CTX_free� from_buffer� CMAC_Init�len�_ctx) �selfr r �ctx�registry�adapter� evp_cipher�key_ptr�ress �K/usr/lib/python3/dist-packages/cryptography/hazmat/backends/openssl/cmac.py�__init__z_CMACContext.__init__ sl � � �/�/� �:�:� �&�5��+�� � � �� � �M�� �#��� '� 2�a� 7��� �;��}�5�H� �t�I���� 3�4�G� ��� � �3�?�?�J��-�$�1�1�3�3�C� �M� (� (��� �0B�0G�)G� H� H� H��-�$�'�'��T�]�-?�-M�N�N�C��m�(�4�4�T�Y�?�?�G��-�$�.�.����D�I����� �"�'� � �C� �M� (� (���� 2� 2� 2��� � � � �datac � � | j j � | j |t |� � � � }| j � |dk � � d S )Nr )r r � CMAC_Updater' r& r )r( r2 r. s r/ �updatez_CMACContext.update= sF � ��m� �,�,�T�Y��c�$�i�i�H�H�� � �$�$�S�A�X�.�.�.�.�.r1 c �z � | j j � d| j � � }| j j � d| j � � }| j j � | j ||� � }| j � |dk � � d | _ | j j � |� � d d � S )Nzunsigned char[]zsize_t *r ) r r �newr r � CMAC_Finalr' r �buffer)r( �buf�lengthr. s r/ �finalizez_CMACContext.finalizeA s� � ��m� �$�$�%6��8K�L�L��� �#�'�'� �D�4G�H�H���m� �+�+�D�I�s�F�C�C�� � �$�$�S�A�X�.�.�.��� ��}�!�(�(��-�-�a�a�a�0�0r1 c �Z � | j j � � � }| j j � || j j j � � }| j j � || j � � }| j � |dk � � t | j | j |�� � S )Nr )r) ) r r r r r" r# � CMAC_CTX_copyr' r r r )r( � copied_ctxr. s r/ �copyz_CMACContext.copyK s� � ��]�'�4�4�6�6� ��]�'�*�*� �� �*�8� � � � �m� �.�.�z�4�9�E�E�� � �$�$�S�A�X�.�.�.��D�M�4�?� �K�K�K�Kr1 � signaturec �v � | � � � }t j ||� � st d� � �d S )Nz Signature did not match digest.)r< r �bytes_eqr )r( rA �digests r/ �verifyz_CMACContext.verifyT s@ � �� � � � �� �%�f�i�8�8� F�"�#D�E�E� E� F� Fr1 )N)r r r r r N)r r ) �__name__� __module__� __qualname__r0 �bytesr5 r< r@ rE � r1 r/ r r s� � � � � � � � &��&� 2�&� � &� &� &� &�P/�5� /�T� /� /� /� /�1�%� 1� 1� 1� 1�L� L� L� L�F�� F�$� F� F� F� F� F� Fr1 r )�typing�cryptography.exceptionsr r r � cryptography.hazmat.primitivesr �,cryptography.hazmat.primitives.ciphers.modesr � TYPE_CHECKINGr �,cryptography.hazmat.backends.openssl.backendr r rJ r1 r/ �<module>rQ s� �� � � � �� � � � � � � � � � 9� 8� 8� 8� 8� 8� <� <� <� <� <� <� �� E�6�6�6�6�6�6�D�D�D�D�D�D�CF� CF� CF� CF� CF� CF� CF� CF� CF� CFr1