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Module's constants for the modes of operation supported with Triple DES:
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:var MODE_ECB: :ref:`Electronic Code Book (ECB) <ecb_mode>`
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:var MODE_CBC: :ref:`Cipher-Block Chaining (CBC) <cbc_mode>`
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:var MODE_CFB: :ref:`Cipher FeedBack (CFB) <cfb_mode>`
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:var MODE_OFB: :ref:`Output FeedBack (OFB) <ofb_mode>`
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:var MODE_CTR: :ref:`CounTer Mode (CTR) <ctr_mode>`
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:var MODE_OPENPGP: :ref:`OpenPGP Mode <openpgp_mode>`
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:var MODE_EAX: :ref:`EAX Mode <eax_mode>`
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é N)Ú_create_cipher)Ú byte_stringÚbchrÚbordÚbstr)Úload_pycryptodome_raw_libÚ VoidPointerÚ SmartPointerÚc_size_tzCrypto.Cipher._raw_des3aÀ
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int DES3_start_operation(const uint8_t key[],
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size_t key_len,
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void **pResult);
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int DES3_encrypt(const void *state,
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const uint8_t *in,
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uint8_t *out,
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size_t data_len);
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int DES3_decrypt(const void *state,
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const uint8_t *in,
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uint8_t *out,
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size_t data_len);
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int DES3_stop_operation(void *state);
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c óþ d }t | « t vr t d« dj | D cg c] }t |t |« « « c}« }|dd |dd k( s |dd |dd k( r t d « |S c c}w )
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am Set the parity bits in a TDES key.
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:param key_in: the TDES key whose bits need to be adjusted
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:type key_in: byte string
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:returns: a copy of ``key_in``, with the parity bits correctly set
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:rtype: byte string
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:raises ValueError: if the TDES key is not 16 or 24 bytes long
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:raises ValueError: if the TDES key degenerates into Single DES
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c óN d}t dd« D ] }|| |z dz z } | dz |z S )Né é éþ )Úrange)Úkey_byteÚparityÚis õe H:\项ç®\archive\æµè¯ç»\èæ¬\Change_password\venv_build\Lib\site-packages\Crypto/Cipher/DES3.pyÚ parity_bytez&adjust_key_parity.<locals>.parity_byteI s> ØÜq!ò *AØ x 1}¨Ñ)Ñ )Fð *à4 6Ñ)Ð)ó zNot a valid TDES keyr Nr é iðÿÿÿiøÿÿÿz(Triple DES key degenerates to single DES)ÚlenÚkey_sizeÚ
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j }t
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j }t « } ||t t |« « |j « « }|rt d|z « t |j « |« S # t $ r t d« w xY w)z}This method instantiates and returns a handle to a low-level base cipher.
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It will absorb named parameters in the process.ÚkeyzMissing 'key' parameterz,Error %X while instantiating the TDES cipher)ÚpopÚKeyErrorÚ TypeErrorr r Ú _raw_des3_libÚDES3_start_operationÚDES3_stop_operationr r r Ú
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nÓ 5Ð5øô ò 3ÜÐ1Ó2Ð2ð3ús B% Â%B:c óN t t j t | |g|¢i |¤S )a Create a new Triple DES cipher.
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:param key:
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The secret key to use in the symmetric cipher.
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It must be 16 or 24 byte long. The parity bits will be ignored.
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:type key: bytes/bytearray/memoryview
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:param mode:
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The chaining mode to use for encryption or decryption.
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:type mode: One of the supported ``MODE_*`` constants
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:Keyword Arguments:
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* **iv** (*bytes*, *bytearray*, *memoryview*) --
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(Only applicable for ``MODE_CBC``, ``MODE_CFB``, ``MODE_OFB``,
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and ``MODE_OPENPGP`` modes).
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The initialization vector to use for encryption or decryption.
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For ``MODE_CBC``, ``MODE_CFB``, and ``MODE_OFB`` it must be 8 bytes long.
|
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For ``MODE_OPENPGP`` mode only,
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it must be 8 bytes long for encryption
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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).
|
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* **nonce** (*bytes*, *bytearray*, *memoryview*) --
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(Only applicable for ``MODE_EAX`` and ``MODE_CTR``).
|
|
A value that must never be reused for any other encryption done
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with this key.
|
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For ``MODE_EAX`` there are no
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restrictions on its length (recommended: **16** bytes).
|
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For ``MODE_CTR``, its length must be in the range **[0..7]**.
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If not provided for ``MODE_EAX``, a random byte string is generated (you
|
can read it back via the ``nonce`` attribute).
|
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* **segment_size** (*integer*) --
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(Only ``MODE_CFB``).The number of **bits** the plaintext and ciphertext
|
are segmented in. It must be a multiple of 8.
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If not specified, it will be assumed to be 8.
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* **mac_len** : (*integer*) --
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(Only ``MODE_EAX``)
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Length of the authentication tag, in bytes.
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It must be no longer than 8 (default).
|
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* **initial_value** : (*integer*) --
|
(Only ``MODE_CTR``). The initial value for the counter within
|
the counter block. By default it is **0**.
|
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:Return: a Triple DES object, of the applicable mode.
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