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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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,� -� -�� � � � 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.
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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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__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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