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a c�h�* � @ sp d Z dgZddlmZ ddlmZmZmZmZm Z m Z m Z m Z ddl mZ edd�ZG dd� de�Zd d � Zd S ) z' Ciphertext Block Chaining (CBC) mode. �CbcMode� )� _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_cbca� int CBC_start_operation(void *cipher, const uint8_t iv[], size_t iv_len, void **pResult); int CBC_encrypt(void *cbcState, const uint8_t *in, uint8_t *out, size_t data_len); int CBC_decrypt(void *cbcState, const uint8_t *in, uint8_t *out, size_t data_len); int CBC_stop_operation(void *state); c @ s, e Zd ZdZdd� Zd dd�Zd dd�ZdS ) r a[ *Cipher-Block Chaining (CBC)*. Each of the ciphertext blocks depends on the current and all previous plaintext blocks. An Initialization Vector (*IV*) is required. See `NIST SP800-38A`_ , Section 6.2 . .. _`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| _| j| jg| _dS )a Create a new block cipher, configured in CBC 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 unpredictable**. Ideally it is picked randomly. Reusing the *IV* for encryptions performed with the same key compromises confidentiality. z)Error %d while instantiating the CBC modeN)r �_state� raw_cbc_libZCBC_start_operation�getr r �lenZ address_of� ValueErrorr ZCBC_stop_operation�release� block_sizer �iv�IV�encrypt�decrypt�_next)�selfZ block_cipherr �result� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/Cryptodome/Cipher/_mode_cbc.py�__init__N s$ �� � zCbcMode.__init__Nc C s� | j | jvrtd��| j g| _|du r4tt|��}n4|}t|�sHtd��t|�t|�krhtdt|� ��t�| j � � t |�t |�t t|���}|r�|dkr�td| j ��td| ��|du r�t|�S dS 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) That also means that you cannot reuse an object for encrypting or decrypting other data with the same key. This function does not add any padding to the plaintext. :Parameters: plaintext : bytes/bytearray/memoryview The piece of data to encrypt. Its lenght must be multiple of the cipher block size. :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``. 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)� �3Data must be padded to %d byte boundary in CBC modez%Error %d while encrypting in CBC mode)r r � TypeErrorr r r r r Z CBC_encryptr r r r r r )r � plaintext�output� ciphertextr r r r r } s0 $ � � zCbcMode.encryptc C s� | j | jvrtd��| j g| _|du r4tt|��}n4|}t|�sHtd��t|�t|�krhtdt|� ��t�| j � � t |�t |�t t|���}|r�|dkr�td| j ��td| ��|du r�t|�S dS 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. Its length must be multiple of the cipher block size. :Keywords: output : bytearray/memoryview The location where the plaintext must be written to. If ``None``, the plaintext is returned. :Return: If ``output`` is ``None``, the plaintext is returned as ``bytes``. Otherwise, ``None``. z*decrypt() cannot be called after encrypt()Nr r r r! z%Error %d while decrypting in CBC mode)r r r" r r r r r Z CBC_decryptr r r r r r )r r% r$ r# r r r r r � s0 ! � � zCbcMode.decrypt)N)N)�__name__� __module__� __qualname__�__doc__r r r r r r r r ? s / Bc K s� | � |�}|�dd�}|�dd�}d||fkr8t| j�}|durR|durVtd��n|}t|�| jkrrtd| j ��|r�tdt|� ��t||�S )a� Instantiate a cipher object that performs CBC encryption/decryption. :Parameters: factory : module The underlying block cipher, a module from ``Cryptodome.Cipher``. :Keywords: iv : bytes/bytearray/memoryview The IV to use for CBC. 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 CBC: %s) Z_create_base_cipher�popr r r" r r �strr )�factory�kwargsZ cipher_stater r r r r �_create_cbc_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 ( A
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