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# -*- coding: utf-8 -*- | ||
# | ||
# Cipher/AES.py : AES | ||
# | ||
# =================================================================== | ||
# The contents of this file are dedicated to the public domain. To | ||
# the extent that dedication to the public domain is not available, | ||
# everyone is granted a worldwide, perpetual, royalty-free, | ||
# non-exclusive license to exercise all rights associated with the | ||
# contents of this file for any purpose whatsoever. | ||
# No rights are reserved. | ||
# | ||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | ||
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | ||
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
# SOFTWARE. | ||
# =================================================================== | ||
""" | ||
Module's constants for the modes of operation supported with AES: | ||
: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_CCM: :ref:`Counter with CBC-MAC (CCM) Mode <ccm_mode>` | ||
:var MODE_EAX: :ref:`EAX Mode <eax_mode>` | ||
:var MODE_GCM: :ref:`Galois Counter Mode (GCM) <gcm_mode>` | ||
:var MODE_SIV: :ref:`Syntethic Initialization Vector (SIV) <siv_mode>` | ||
:var MODE_OCB: :ref:`Offset Code Book (OCB) <ocb_mode>` | ||
""" | ||
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import sys | ||
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from Crypto.Cipher import _create_cipher | ||
from Crypto.Util._raw_api import (load_pycryptodome_raw_lib, | ||
VoidPointer, SmartPointer, | ||
c_size_t, c_uint8_ptr) | ||
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from Crypto.Util import _cpu_features | ||
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_cproto = """ | ||
int AES_start_operation(const uint8_t key[], | ||
size_t key_len, | ||
void **pResult); | ||
int AES_encrypt(const void *state, | ||
const uint8_t *in, | ||
uint8_t *out, | ||
size_t data_len); | ||
int AES_decrypt(const void *state, | ||
const uint8_t *in, | ||
uint8_t *out, | ||
size_t data_len); | ||
int AES_stop_operation(void *state); | ||
""" | ||
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# Load portable AES | ||
_raw_aes_lib = load_pycryptodome_raw_lib("Crypto.Cipher._raw_aes", | ||
_cproto) | ||
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# Try to load AES with AES NI instructions | ||
try: | ||
_raw_aesni_lib = None | ||
if _cpu_features.have_aes_ni(): | ||
_raw_aesni_lib = load_pycryptodome_raw_lib("Crypto.Cipher._raw_aesni", | ||
_cproto.replace("AES", | ||
"AESNI")) | ||
# _raw_aesni may not have been compiled in | ||
except OSError: | ||
pass | ||
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def _create_base_cipher(dict_parameters): | ||
"""This method instantiates and returns a handle to a low-level | ||
base cipher. It will absorb named parameters in the process.""" | ||
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use_aesni = dict_parameters.pop("use_aesni", True) | ||
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try: | ||
key = dict_parameters.pop("key") | ||
except KeyError: | ||
raise TypeError("Missing 'key' parameter") | ||
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if len(key) not in key_size: | ||
raise ValueError("Incorrect AES key length (%d bytes)" % len(key)) | ||
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if use_aesni and _raw_aesni_lib: | ||
start_operation = _raw_aesni_lib.AESNI_start_operation | ||
stop_operation = _raw_aesni_lib.AESNI_stop_operation | ||
else: | ||
start_operation = _raw_aes_lib.AES_start_operation | ||
stop_operation = _raw_aes_lib.AES_stop_operation | ||
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cipher = VoidPointer() | ||
result = start_operation(c_uint8_ptr(key), | ||
c_size_t(len(key)), | ||
cipher.address_of()) | ||
if result: | ||
raise ValueError("Error %X while instantiating the AES cipher" | ||
% result) | ||
return SmartPointer(cipher.get(), stop_operation) | ||
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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. | ||
""" | ||
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kwargs["add_aes_modes"] = True | ||
return _create_cipher(sys.modules[__name__], key, mode, *args, **kwargs) | ||
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MODE_ECB = 1 | ||
MODE_CBC = 2 | ||
MODE_CFB = 3 | ||
MODE_OFB = 5 | ||
MODE_CTR = 6 | ||
MODE_OPENPGP = 7 | ||
MODE_CCM = 8 | ||
MODE_EAX = 9 | ||
MODE_SIV = 10 | ||
MODE_GCM = 11 | ||
MODE_OCB = 12 | ||
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# Size of a data block (in bytes) | ||
block_size = 16 | ||
# Size of a key (in bytes) | ||
key_size = (16, 24, 32) |
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