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편집 파일: _mode_openpgp.cpython-311.pyc
� O�Dg� � �J � d Z dgZddlmZ ddlmZ G d� de� � Zd� ZdS )z OpenPGP mode. � OpenPgpMode� )� _copy_bytes)�get_random_bytesc �$ � e Zd ZdZd� Zd� Zd� ZdS )r az OpenPGP mode. This mode is a variant of CFB, and it is only used in PGP and OpenPGP_ applications. If in doubt, use another mode. An Initialization Vector (*IV*) is required. Unlike CFB, the *encrypted* IV (not the IV itself) is transmitted to the receiver. The IV is a random data block. For legacy reasons, two of its bytes are duplicated to act as a checksum for the correctness of the key, which is now known to be insecure and is ignored. The encrypted IV is therefore 2 bytes longer than the clean IV. .. _OpenPGP: http://tools.ietf.org/html/rfc4880 :undocumented: __init__ c �d � |j | _ d| _ |j ||j fd| j z | j dz d�|��}t d d |� � }t |� � | j k r&|� ||dd � z � � | _ nat |� � | j dz k r%|| _ |� |� � d d� }n!t d| j | j dz fz � � �|x| _ | _ |j ||j f| j | j d � | j dz d�|��| _ d S )NF� � )�IV� segment_size���� z4Length of IV must be %d or %d bytes for MODE_OPENPGP) � block_size�_done_first_block�new�MODE_CFBr �len�encrypt� _encrypted_IV�decrypt� ValueError�ivr �_cipher)�self�factory�keyr � cipher_params� IV_ciphers �}/builddir/build/BUILD/imunify360-venv-2.4.0/opt/imunify360/venv/lib64/python3.11/site-packages/Crypto/Cipher/_mode_openpgp.py�__init__zOpenPgpMode.__init__= s� � � "�,���!&�� � �G�K�� �(�)� #�T�_�4�%)�_�q�%8� )� )� (� )� )� � ��t�R� (� (�� �r�7�7�d�o� %� %�!*�!2�!2�2��2�3�3��<�!@�!@�D� � � ��W�W���!�+� +� +�!#�D� � �"�"�2�&�&�s��s�+�B�B� � 1� $��� �1�1D� E� F� G� G� G� � ���$�'� #�w�{� � #� ,�-� $� 1�4�?�2B�2C�2C� D�)-� �1�)<� -� -� ,� -� -�� � � � c �j � | j � |� � }| j s| j |z }d| _ |S )a� Encrypt data with the key and the parameters set at initialization. A cipher object is stateful: once you have encrypted a message you cannot encrypt (or decrypt) another message using the same object. The data to encrypt can be broken up in two or more pieces and `encrypt` can be called multiple times. That is, the statement: >>> c.encrypt(a) + c.encrypt(b) is equivalent to: >>> c.encrypt(a+b) This function does not add any padding to the plaintext. :Parameters: plaintext : bytes/bytearray/memoryview The piece of data to encrypt. :Return: the encrypted data, as a byte string. It is as long as *plaintext* with one exception: when encrypting the first message chunk, the encypted IV is prepended to the returned ciphertext. T)r r r r )r � plaintext�ress r r zOpenPgpMode.encryptg s> � �> �l�"�"�9�-�-���%� *��$�s�*�C�%)�D� "�� r c �6 � | j � |� � S )a� Decrypt data with the key and the parameters set at initialization. A cipher object is stateful: once you have decrypted a message you cannot decrypt (or encrypt) another message with the same object. The data to decrypt can be broken up in two or more pieces and `decrypt` can be called multiple times. That is, the statement: >>> c.decrypt(a) + c.decrypt(b) is equivalent to: >>> c.decrypt(a+b) This function does not remove any padding from the plaintext. :Parameters: ciphertext : bytes/bytearray/memoryview The piece of data to decrypt. :Return: the decrypted data (byte string). )r r )r � ciphertexts r r zOpenPgpMode.decrypt� s � �6 �|�#�#�J�/�/�/r N)�__name__� __module__� __qualname__�__doc__r r r � r r r r ( sM � � � � � �� �((-� (-� (-�T#� #� #�J0� 0� 0� 0� 0r c �r � |� dd� � }|� dd� � }d||fk rt | j � � }|�|�t d� � �n|} |� d� � }n1# t $ r$}t dt |� � z � � �d}~ww xY wt | |||� � S )a# Create a new block cipher, configured in OpenPGP mode. :Parameters: factory : module The module. :Keywords: key : bytes/bytearray/memoryview The secret key to use in the symmetric cipher. IV : bytes/bytearray/memoryview The initialization vector to use for encryption or decryption. For encryption, the IV must be as long as the cipher block size. For decryption, it must be 2 bytes longer (it is actually the *encrypted* IV which was prefixed to the ciphertext). r Nr )NNz*You must either use 'iv' or 'IV', not bothr zMissing component: )�popr r � TypeError�KeyError�strr )r �kwargsr r r �es r �_create_openpgp_cipherr2 � s� � �( ���D�$� � �B� ���D�$� � �B���B�x� � � �g� 0� 1� 1�� �~� �>�� H�I�I� I� � ��8��j�j�� � ���� � 8� 8� 8��-��A���6�7�7�7�����8���� �w��R�� 0� 0�0s � A6 �6 B$� B � B$N) r) �__all__�Crypto.Util.py3compatr � Crypto.Randomr �objectr r2 r* r r �<module>r7 s� ��>� � �/�� -� -� -� -� -� -� *� *� *� *� *� *�0� 0� 0� 0� 0�&� 0� 0� 0�D$1� $1� $1� $1� $1r