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a c�h � @ s� d Z ddlZddlmZ ddlmZmZmZmZ ddl m Z m Z m Z m Z e dd�Zdd � Zd d � Zd d � ZdZdZdZdZdZdZdZdZdZdS )a� Module's constants for the modes of operation supported with Triple DES: :var MODE_ECB: :ref:`Electronic Code Book (ECB) <ecb_mode>` :var MODE_CBC: :ref:`Cipher-Block Chaining (CBC) <cbc_mode>` :var MODE_CFB: :ref:`Cipher FeedBack (CFB) <cfb_mode>` :var MODE_OFB: :ref:`Output FeedBack (OFB) <ofb_mode>` :var MODE_CTR: :ref:`CounTer Mode (CTR) <ctr_mode>` :var MODE_OPENPGP: :ref:`OpenPGP Mode <openpgp_mode>` :var MODE_EAX: :ref:`EAX Mode <eax_mode>` � N)�_create_cipher)� byte_string�bchr�bord�bstr)�load_pycryptodome_raw_lib� VoidPointer� SmartPointer�c_size_tzCrypto.Cipher._raw_des3a� int DES3_start_operation(const uint8_t key[], size_t key_len, void **pResult); int DES3_encrypt(const void *state, const uint8_t *in, uint8_t *out, size_t data_len); int DES3_decrypt(const void *state, const uint8_t *in, uint8_t *out, size_t data_len); int DES3_stop_operation(void *state); c sp dd� � t | �tvr td��d�� fdd�| D ��}|dd� |dd � ksd|d d � |d d� krltd ��|S ) am Set the parity bits in a TDES key. :param key_in: the TDES key whose bits need to be adjusted :type key_in: byte string :returns: a copy of ``key_in``, with the parity bits correctly set :rtype: byte string :raises ValueError: if the TDES key is not 16 or 24 bytes long :raises ValueError: if the TDES key degenerates into Single DES c S s0 d}t dd�D ]}|| |? d@ N }q| d@ |B S )N� � � )�range)Zkey_byteZparity�i� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/Crypto/Cipher/DES3.py� parity_byteI s z&adjust_key_parity.<locals>.parity_bytezNot a valid TDES key� c s g | ]}t � t|����qS r )r r )�.0�x�r r r � <listcomp>R r z%adjust_key_parity.<locals>.<listcomp>Nr � i�i����z(Triple DES key degenerates to single DES)�len�key_size� ValueError�join)�key_inZkey_outr r r �adjust_key_parity< s 0r c C s~ z| � d�}W n ty( td��Y n0 tt|��}tj}tj}t� }||t t |��|� � �}|rpt d| ��t |�� |�S )z}This method instantiates and returns a handle to a low-level base cipher. It will absorb named parameters in the process.�keyzMissing 'key' parameterz,Error %X while instantiating the TDES cipher)�pop�KeyError� TypeErrorr r � _raw_des3_libZDES3_start_operationZDES3_stop_operationr r r Z address_ofr r �get)Zdict_parametersr r Zstart_operationZstop_operation�cipher�resultr r r �_create_base_cipherZ s" ��r' c O s t tjt | |g|�R i |��S )a Create a new Triple DES cipher. :param key: The secret key to use in the symmetric cipher. It must be 16 or 24 byte long. The parity bits will be ignored. :type key: bytes/bytearray/memoryview :param mode: The chaining mode to use for encryption or decryption. :type mode: One of the supported ``MODE_*`` constants :Keyword Arguments: * **iv** (*bytes*, *bytearray*, *memoryview*) -- (Only applicable for ``MODE_CBC``, ``MODE_CFB``, ``MODE_OFB``, and ``MODE_OPENPGP`` modes). The initialization vector to use for encryption or decryption. For ``MODE_CBC``, ``MODE_CFB``, and ``MODE_OFB`` it must be 8 bytes long. For ``MODE_OPENPGP`` mode only, it must be 8 bytes long for encryption and 10 bytes for decryption (in the latter case, it is actually the *encrypted* IV which was prefixed to the ciphertext). If not provided, a random byte string is generated (you must then read its value with the :attr:`iv` attribute). * **nonce** (*bytes*, *bytearray*, *memoryview*) -- (Only applicable for ``MODE_EAX`` and ``MODE_CTR``). A value that must never be reused for any other encryption done with this key. For ``MODE_EAX`` there are no restrictions on its length (recommended: **16** bytes). For ``MODE_CTR``, its length must be in the range **[0..7]**. If not provided for ``MODE_EAX``, a random byte string is generated (you can read it back via the ``nonce`` attribute). * **segment_size** (*integer*) -- (Only ``MODE_CFB``).The number of **bits** the plaintext and ciphertext are segmented in. It must be a multiple of 8. If not specified, it will be assumed to be 8. * **mac_len** : (*integer*) -- (Only ``MODE_EAX``) Length of the authentication tag, in bytes. It must be no longer than 8 (default). * **initial_value** : (*integer*) -- (Only ``MODE_CTR``). The initial value for the counter within the counter block. By default it is **0**. :Return: a Triple DES object, of the applicable mode. )r �sys�modules�__name__)r �mode�args�kwargsr r r �newr s <r. r � � � � � � r )r � )�__doc__r( Z Crypto.Cipherr ZCrypto.Util.py3compatr r r r ZCrypto.Util._raw_apir r r r r# r r' r. ZMODE_ECBZMODE_CBCZMODE_CFBZMODE_OFBZMODE_CTRZ MODE_OPENPGPZMODE_EAX� block_sizer r r r r �<module> s( � >
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