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a c�h� � @ s> d Z dgZddlmZ ddlmZ G dd� de�Zdd� ZdS ) z OpenPGP mode. � OpenPgpMode� )� _copy_bytes)�get_random_bytesc @ s( e Zd ZdZdd� Zdd� Zdd� 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 C s� |j | _ d| _|j||jfd| j | j d d�|��}td d |�}t|�| j krj|�||dd � �| _nDt|�| j d kr�|| _|�|�d d� }nt d| j | j d f ��| | _ | _ |j||jf| j| j d � | j d d�|��| _ d S )NF� � )�IVZ segment_size���� z4Length of IV must be %d or %d bytes for MODE_OPENPGP) � block_size�_done_first_block�newZMODE_CFBr �len�encrypt� _encrypted_IV�decrypt� ValueError�ivr �_cipher)�self�factory�keyr Z cipher_paramsZ IV_cipher� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/Crypto/Cipher/_mode_openpgp.py�__init__= s< ��� � ���zOpenPgpMode.__init__c C s& | j �|�}| js"| j| }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 Z plaintext�resr r r r g s zOpenPgpMode.encryptc C s | 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 Z ciphertextr r r r � s zOpenPgpMode.decryptN)�__name__� __module__� __qualname__�__doc__r r r r r r r r ( s *%c K s� |� dd�}|� dd�}d||fkr.t| j�}|durH|durLtd��n|}z|� d�}W n4 ty� } z tdt|� ��W Y d}~n d}~0 0 t| |||�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 �er r r �_create_openpgp_cipher� s &r% N) r �__all__ZCrypto.Util.py3compatr Z Crypto.Randomr �objectr r% r r r r �<module> s
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