/usr/lib/python3/dist-packages/asyncssh/cipher.py is in python3-asyncssh 1.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | # Copyright (c) 2013-2015 by Ron Frederick <ronf@timeheart.net>.
# All rights reserved.
#
# This program and the accompanying materials are made available under
# the terms of the Eclipse Public License v1.0 which accompanies this
# distribution and is available at:
#
# http://www.eclipse.org/legal/epl-v10.html
#
# Contributors:
# Ron Frederick - initial implementation, API, and documentation
"""Symmetric key encryption handlers"""
from .crypto import lookup_cipher
_enc_algs = []
_enc_params = {}
_enc_ciphers = {}
def register_encryption_alg(alg, cipher_name, mode_name, key_size,
initial_bytes):
"""Register an encryption algorithm"""
cipher = lookup_cipher(cipher_name, mode_name)
if cipher: # pragma: no branch
_enc_algs.append(alg)
_enc_params[alg] = (key_size, cipher.iv_size,
cipher.block_size, cipher.mode_name)
_enc_ciphers[alg] = (cipher, initial_bytes)
def get_encryption_algs():
"""Return a list of available encryption algorithms"""
return _enc_algs
def get_encryption_params(alg):
"""Get parameters of an encryption algorithm
This function returns the key, iv, and block sizes of an encryption
algorithm.
"""
return _enc_params[alg]
def get_cipher(alg, key, iv=None):
"""Return an instance of a cipher
This function returns a cipher object initialized with the specified
key and iv that can be used for data encryption and decryption.
"""
cipher, initial_bytes = _enc_ciphers[alg]
return cipher.new(key, iv, initial_bytes)
# pylint: disable=bad-whitespace
register_encryption_alg(b'chacha20-poly1305@openssh.com', 'chacha20-poly1305',
'chacha', 64, 0)
register_encryption_alg(b'aes256-ctr', 'aes', 'ctr', 32, 0)
register_encryption_alg(b'aes192-ctr', 'aes', 'ctr', 24, 0)
register_encryption_alg(b'aes128-ctr', 'aes', 'ctr', 16, 0)
register_encryption_alg(b'aes256-gcm@openssh.com', 'aes', 'gcm', 32, 0)
register_encryption_alg(b'aes128-gcm@openssh.com', 'aes', 'gcm', 16, 0)
register_encryption_alg(b'aes256-cbc', 'aes', 'cbc', 32, 0)
register_encryption_alg(b'aes192-cbc', 'aes', 'cbc', 24, 0)
register_encryption_alg(b'aes128-cbc', 'aes', 'cbc', 16, 0)
register_encryption_alg(b'3des-cbc', 'des3', 'cbc', 24, 0)
register_encryption_alg(b'blowfish-cbc', 'blowfish', 'cbc', 16, 0)
register_encryption_alg(b'cast128-cbc', 'cast', 'cbc', 16, 0)
register_encryption_alg(b'arcfour256', 'arc4', None, 32, 1536)
register_encryption_alg(b'arcfour128', 'arc4', None, 16, 1536)
register_encryption_alg(b'arcfour', 'arc4', None, 16, 0)
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