mirror of https://github.com/sgoudham/Enso-Bot.git
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
5 years ago
|
# Copyright 2013 Donald Stufft and individual contributors
|
||
|
|
#
|
||
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
# you may not use this file except in compliance with the License.
|
||
|
|
# You may obtain a copy of the License at
|
||
|
|
#
|
||
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
#
|
||
|
|
# Unless required by applicable law or agreed to in writing, software
|
||
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
# See the License for the specific language governing permissions and
|
||
|
|
# limitations under the License.
|
||
|
|
|
||
|
|
from __future__ import absolute_import, division, print_function
|
||
|
|
|
||
|
|
from nacl import exceptions as exc
|
||
|
|
from nacl._sodium import ffi, lib
|
||
|
|
from nacl.exceptions import ensure
|
||
|
|
|
||
|
|
|
||
|
|
crypto_secretbox_KEYBYTES = lib.crypto_secretbox_keybytes()
|
||
|
|
crypto_secretbox_NONCEBYTES = lib.crypto_secretbox_noncebytes()
|
||
|
|
crypto_secretbox_ZEROBYTES = lib.crypto_secretbox_zerobytes()
|
||
|
|
crypto_secretbox_BOXZEROBYTES = lib.crypto_secretbox_boxzerobytes()
|
||
|
|
crypto_secretbox_MACBYTES = lib.crypto_secretbox_macbytes()
|
||
|
|
crypto_secretbox_MESSAGEBYTES_MAX = lib.crypto_secretbox_messagebytes_max()
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_secretbox(message, nonce, key):
|
||
|
|
"""
|
||
|
|
Encrypts and returns the message ``message`` with the secret ``key`` and
|
||
|
|
the nonce ``nonce``.
|
||
|
|
|
||
|
|
:param message: bytes
|
||
|
|
:param nonce: bytes
|
||
|
|
:param key: bytes
|
||
|
|
:rtype: bytes
|
||
|
|
"""
|
||
|
|
if len(key) != crypto_secretbox_KEYBYTES:
|
||
|
|
raise exc.ValueError("Invalid key")
|
||
|
|
|
||
|
|
if len(nonce) != crypto_secretbox_NONCEBYTES:
|
||
|
|
raise exc.ValueError("Invalid nonce")
|
||
|
|
|
||
|
|
padded = b"\x00" * crypto_secretbox_ZEROBYTES + message
|
||
|
|
ciphertext = ffi.new("unsigned char[]", len(padded))
|
||
|
|
|
||
|
|
res = lib.crypto_secretbox(ciphertext, padded, len(padded), nonce, key)
|
||
|
|
ensure(res == 0, "Encryption failed", raising=exc.CryptoError)
|
||
|
|
|
||
|
|
ciphertext = ffi.buffer(ciphertext, len(padded))
|
||
|
|
return ciphertext[crypto_secretbox_BOXZEROBYTES:]
|
||
|
|
|
||
|
|
|
||
|
|
def crypto_secretbox_open(ciphertext, nonce, key):
|
||
|
|
"""
|
||
|
|
Decrypt and returns the encrypted message ``ciphertext`` with the secret
|
||
|
|
``key`` and the nonce ``nonce``.
|
||
|
|
|
||
|
|
:param ciphertext: bytes
|
||
|
|
:param nonce: bytes
|
||
|
|
:param key: bytes
|
||
|
|
:rtype: bytes
|
||
|
|
"""
|
||
|
|
if len(key) != crypto_secretbox_KEYBYTES:
|
||
|
|
raise exc.ValueError("Invalid key")
|
||
|
|
|
||
|
|
if len(nonce) != crypto_secretbox_NONCEBYTES:
|
||
|
|
raise exc.ValueError("Invalid nonce")
|
||
|
|
|
||
|
|
padded = b"\x00" * crypto_secretbox_BOXZEROBYTES + ciphertext
|
||
|
|
plaintext = ffi.new("unsigned char[]", len(padded))
|
||
|
|
|
||
|
|
res = lib.crypto_secretbox_open(
|
||
|
|
plaintext, padded, len(padded), nonce, key)
|
||
|
|
ensure(res == 0, "Decryption failed. Ciphertext failed verification",
|
||
|
|
raising=exc.CryptoError)
|
||
|
|
|
||
|
|
plaintext = ffi.buffer(plaintext, len(padded))
|
||
|
|
return plaintext[crypto_secretbox_ZEROBYTES:]
|