def new(key, mode, *args, **kwargs):
"""Create a new Blowfish cipher
:param key:
The secret key to use in the symmetric cipher.
Its length can vary from 5 to 56 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 Blowfish object, of the applicable mode.
"""
return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs)
def new(key, mode, *args, **kwargs):
"""Create a new AES cipher.
:param key:
The secret key to use in the symmetric cipher.
It must be 16, 24 or 32 bytes long (respectively for *AES-128*,
*AES-192* or *AES-256*).
For ``MODE_SIV`` only, it doubles to 32, 48, or 64 bytes.
:type key: bytes/bytearray/memoryview
:param mode:
The chaining mode to use for encryption or decryption.
If in doubt, use ``MODE_EAX``.
: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 16 bytes long.
For ``MODE_OPENPGP`` mode only,
it must be 16 bytes long for encryption
and 18 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_CCM``, ``MODE_EAX``, ``MODE_GCM``,
``MODE_SIV``, ``MODE_OCB``, and ``MODE_CTR``).
A value that must never be reused for any other encryption done
with this key (except possibly for ``MODE_SIV``, see below).
For ``MODE_EAX``, ``MODE_GCM`` and ``MODE_SIV`` there are no
restrictions on its length (recommended: **16** bytes).
For ``MODE_CCM``, its length must be in the range **[7..13]**.
Bear in mind that with CCM there is a trade-off between nonce
length and maximum message size. Recommendation: **11** bytes.
For ``MODE_OCB``, its length must be in the range **[1..15]**
(recommended: **15**).
For ``MODE_CTR``, its length must be in the range **[0..15]**
(recommended: **8**).
For ``MODE_SIV``, the nonce is optional, if it is not specified,
then no nonce is being used, which renders the encryption
deterministic.
If not provided, for modes other than ``MODE_SIV```, a random
byte string of the recommended length is used (you must then
read its value with the :attr:`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``, ``MODE_GCM``, ``MODE_OCB``, ``MODE_CCM``)
Length of the authentication tag, in bytes.
It must be even and in the range **[4..16]**.
The recommended value (and the default, if not specified) is **16**.
* **msg_len** : (*integer*) --
(Only ``MODE_CCM``). Length of the message to (de)cipher.
If not specified, ``encrypt`` must be called with the entire message.
Similarly, ``decrypt`` can only be called once.
* **assoc_len** : (*integer*) --
(Only ``MODE_CCM``). Length of the associated data.
If not specified, all associated data is buffered internally,
which may represent a problem for very large messages.
* **initial_value** : (*integer*) --
(Only ``MODE_CTR``). The initial value for the counter within
the counter block. By default it is **0**.
* **use_aesni** : (*boolean*) --
Use Intel AES-NI hardware extensions (default: use if available).
:Return: an AES object, of the applicable mode.
"""
kwargs["add_aes_modes"] = True
return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs)