o Ìn~bã@s’dZddlZddlmZddlmZmZmZmZddl m Z m Z m Z m Z e ddƒZdd „Zd d „Zd d „ZdZdZdZdZdZdZdZdZdZdS)aÇ Module's constants for the modes of operation supported with Triple DES: :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_stringÚbchrÚbordÚbstr)Úload_pycryptodome_raw_libÚ VoidPointerÚ SmartPointerÚc_size_tzCryptodome.Cipher._raw_des3aÀ 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); cspdd„‰t|ƒtvrtdƒ‚d ‡fdd„|Dƒ¡}|dd…|dd …ks2|d d …|d d…kr6td ƒ‚|S) amSet 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 cSs0d}tddƒD] }|||?d@N}q|d@|BS)Néééþ)Úrange)Zkey_byteZparityÚi©rúA/usr/local/lib/python3.10/dist-packages/Cryptodome/Cipher/DES3.pyÚ parity_byteIs z&adjust_key_parity..parity_bytezNot a valid TDES keyócsg|] }tˆt|ƒƒƒ‘qSr)rr)Ú.0Úx©rrrÚ Rsz%adjust_key_parity..Nr éiðÿÿÿiøÿÿÿz(Triple DES key degenerates to single DES)ÚlenÚkey_sizeÚ ValueErrorÚjoin)Úkey_inZkey_outrrrÚadjust_key_parity<s 0rcCszz| d¡}Wn tytdƒ‚wtt|ƒƒ}tj}tj}tƒ}||t t |ƒƒ|  ¡ƒ}|r6t d|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,Error %X while instantiating the TDES cipher)ÚpopÚKeyErrorÚ TypeErrorrrÚ _raw_des3_libZDES3_start_operationZDES3_stop_operationrr rZ address_ofrr Úget)Zdict_parametersrrZstart_operationZstop_operationÚcipherÚresultrrrÚ_create_base_cipherZs$ ÿ  þÿr'cOs ttjt||g|¢Ri|¤ŽS)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. )rÚsysÚmodulesÚ__name__)rÚmodeÚargsÚkwargsrrrÚnewrs s* þ>