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o ;j�' � @ sp d Z dgZddlmZ ddlmZmZmZmZm Z m Z m Z m Z ddl mZ edd�ZG dd� de�Zd d � Zd S ) z Output Feedback (CFB) mode. �OfbMode� )� _copy_bytes)�load_pycryptodome_raw_lib� VoidPointer�create_string_buffer�get_raw_buffer� SmartPointer�c_size_t� c_uint8_ptr�is_writeable_buffer)�get_random_byteszCryptodome.Cipher._raw_ofba int OFB_start_operation(void *cipher, const uint8_t iv[], size_t iv_len, void **pResult); int OFB_encrypt(void *ofbState, const uint8_t *in, uint8_t *out, size_t data_len); int OFB_decrypt(void *ofbState, const uint8_t *in, uint8_t *out, size_t data_len); int OFB_stop_operation(void *state); c @ s, e Zd ZdZdd� Zd dd�Zd dd�ZdS ) r a� *Output FeedBack (OFB)*. This mode is very similar to CBC, but it transforms the underlying block cipher into a stream cipher. The keystream is the iterated block encryption of the previous ciphertext block. An Initialization Vector (*IV*) is required. See `NIST SP800-38A`_ , Section 6.4. .. _`NIST SP800-38A` : http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf :undocumented: __init__ c C s� t � | _t�|�� t|�tt|��| j�� �}|r t d| ��t | j�� tj �| _|� � t|�| _ tdd|�| _ | j| _ ddg| _dS )aS Create a new block cipher, configured in OFB mode. :Parameters: block_cipher : C pointer A smart pointer to the low-level block cipher instance. iv : bytes/bytearray/memoryview The initialization vector to use for encryption or decryption. It is as long as the cipher block. **The IV must be a nonce, to to be reused for any other message**. It shall be a nonce or a random value. Reusing the *IV* for encryptions performed with the same key compromises confidentiality. z)Error %d while instantiating the OFB modeN�encrypt�decrypt)r �_state� raw_ofb_libZOFB_start_operation�getr r �lenZ address_of� ValueErrorr ZOFB_stop_operation�release� block_sizer �iv�IV�_next)�selfZ block_cipherr �result� r �O/opt/saltstack/salt/lib/python3.10/site-packages/Cryptodome/Cipher/_mode_ofb.py�__init__I s* �� � zOfbMode.__init__Nc C s� d| j vr td��dg| _ |du rtt|��}n|}t|�s"td��t|�t|�kr2tdt|� ��t�| j� � t |�t |�t t|���}|rMtd| ��|du rUt |�S dS )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. It can be of any length. :Keywords: output : bytearray/memoryview The location where the ciphertext must be written to. If ``None``, the ciphertext is returned. :Return: If ``output`` is ``None``, the ciphertext is returned as ``bytes``. Otherwise, ``None``. r z*encrypt() cannot be called after decrypt()N�4output must be a bytearray or a writeable memoryview�9output must have the same length as the input (%d bytes)z%Error %d while encrypting in OFB mode) r � TypeErrorr r r r r Z OFB_encryptr r r r r )r � plaintext�output� ciphertextr r r r r y �, !� � zOfbMode.encryptc C s� d| j vr td��dg| _ |du rtt|��}n|}t|�s"td��t|�t|�kr2tdt|� ��t�| j� � t |�t |�t t|���}|rMtd| ��|du rUt |�S dS )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. It can be of any length. :Keywords: output : bytearray/memoryview The location where the plaintext is written to. If ``None``, the plaintext is returned. :Return: If ``output`` is ``None``, the plaintext is returned as ``bytes``. Otherwise, ``None``. r z*decrypt() cannot be called after encrypt()Nr r z%Error %d while decrypting in OFB mode) r r r r r r r Z OFB_decryptr r r r r )r r# r" r! r r r r r � r$ zOfbMode.decrypt)N)�__name__� __module__� __qualname__�__doc__r r r r r r r r 7 s 0=c K s� | � |�}|�dd�}|�dd�}d||fkr t| j�}|dur)|dur(td��n|}t|�| jkr9td| j ��|rCtdt|� ��t||�S )a� Instantiate a cipher object that performs OFB encryption/decryption. :Parameters: factory : module The underlying block cipher, a module from ``Cryptodome.Cipher``. :Keywords: iv : bytes/bytearray/memoryview The IV to use for OFB. IV : bytes/bytearray/memoryview Alias for ``iv``. Any other keyword will be passed to the underlying block cipher. See the relevant documentation for details (at least ``key`` will need to be present). r Nr )NNz*You must either use 'iv' or 'IV', not bothz.Incorrect IV length (it must be %d bytes long)z Unknown parameters for OFB: %s) Z_create_base_cipher�popr r r r r �strr )�factory�kwargsZ cipher_stater r r r r �_create_ofb_cipher� s" �� r- N)r( �__all__ZCryptodome.Util.py3compatr ZCryptodome.Util._raw_apir r r r r r r r ZCryptodome.Randomr r �objectr r- r r r r �<module> s ( >
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