o Ìn~bÇã@sˆdZddlZddlmZddlmZddlmZmZm Z m Z m Z eddƒZ dd „Z d d „Zd Zd ZdZdZdZdZdZdZeddƒZdS)aÁ Module's constants for the modes of operation supported with CAST: :var MODE_ECB: :ref:`Electronic Code Book (ECB) ` :var MODE_CBC: :ref:`Cipher-Block Chaining (CBC) ` :var MODE_CFB: :ref:`Cipher FeedBack (CFB) ` :var MODE_OFB: :ref:`Output FeedBack (OFB) ` :var MODE_CTR: :ref:`CounTer Mode (CTR) ` :var MODE_OPENPGP: :ref:`OpenPGP Mode ` :var MODE_EAX: :ref:`EAX Mode ` éN)Ú_create_cipher)Ú byte_string)Úload_pycryptodome_raw_libÚ VoidPointerÚ SmartPointerÚc_size_tÚ c_uint8_ptrzCryptodome.Cipher._raw_castaÀ int CAST_start_operation(const uint8_t key[], size_t key_len, void **pResult); int CAST_encrypt(const void *state, const uint8_t *in, uint8_t *out, size_t data_len); int CAST_decrypt(const void *state, const uint8_t *in, uint8_t *out, size_t data_len); int CAST_stop_operation(void *state); cCsŽz| d¡}Wn tytdƒ‚wt|ƒtvr!tdt|ƒƒ‚tj}tj}t ƒ}|t |ƒt t|ƒƒ|  ¡ƒ}|r@td|ƒ‚t | ¡|ƒS)z}This method instantiates and returns a handle to a low-level base cipher. It will absorb named parameters in the process.ÚkeyzMissing 'key' parameterz$Incorrect CAST key length (%d bytes)z,Error %X while instantiating the CAST cipher)ÚpopÚKeyErrorÚ TypeErrorÚlenÚkey_sizeÚ ValueErrorÚ _raw_cast_libZCAST_start_operationZCAST_stop_operationrrrZ address_ofrÚget)Zdict_parametersr Zstart_operationZstop_operationÚcipherÚresult©rúA/usr/local/lib/python3.10/dist-packages/Cryptodome/Cipher/CAST.pyÚ_create_base_cipher<s& ÿ  þÿrcOs ttjt||g|¢Ri|¤ŽS)aöCreate a new CAST cipher :param key: The secret key to use in the symmetric cipher. Its length can vary from 5 to 16 bytes. :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 CAST object, of the applicable mode. )rÚsysÚmodulesÚ__name__)r ÚmodeÚargsÚkwargsrrrÚnewVs s(  þ>