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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__
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| _ |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)
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cipher_params IV_ciphers }/builddir/build/BUILD/imunify360-venv-2.6.2/opt/imunify360/venv/lib64/python3.11/site-packages/Crypto/Cipher/_mode_openpgp.py__init__zOpenPgpMode.__init__= s ",!& GK () #T_4%)_q%8 ) )
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( r77do % %!*!2!22233>> 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 plaintextress 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).
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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).
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