a !f@s>dZdgZddlmZddlmZGdddeZddZdS) z OpenPGP mode. OpenPgpMode) _copy_bytes)get_random_bytesc@s(eZdZdZddZddZddZdS) razOpenPGP 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__ cCs|j|_d|_|j||jfd|j|jdd|}tdd|}t||jkrj|||dd|_nDt||jdkr||_||dd}nt d|j|jdf||_ |_ |j||jf|j|j d|jdd||_ dS)NF)IVZ segment_sizez4Length of IV must be %d or %d bytes for MODE_OPENPGP) block_size_done_first_blocknewZMODE_CFBrlenencrypt _encrypted_IVdecrypt ValueErrorivr_cipher)selffactorykeyrZ cipher_paramsZ IV_cipherr\/var/www/html/python-backend/venv/lib/python3.9/site-packages/Crypto/Cipher/_mode_openpgp.py__init__=s<  zOpenPgpMode.__init__cCs&|j|}|js"|j|}d|_|S)aEncrypt 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)rrr r)rZ plaintextresrrrrgs   zOpenPgpMode.encryptcCs |j|S)aDecrypt 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). )rr)rZ ciphertextrrrrszOpenPgpMode.decryptN)__name__ __module__ __qualname____doc__rrrrrrrr(s*%c Ks|dd}|dd}d||fkr.t|j}|durH|durLtdn|}z|d}Wn4ty}ztdt|WYd}~n d}~00t||||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). rNr)NNz*You must either use 'iv' or 'IV', not bothrzMissing component: )poprr TypeErrorKeyErrorstrr)rkwargsrrrerrr_create_openpgp_ciphers     &r%N) r__all__ZCrypto.Util.py3compatrZ Crypto.Randomrobjectrr%rrrrs