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📝 algorithms.py

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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.

from __future__ import absolute_import, division, print_function

from cryptography import utils
from cryptography.hazmat.primitives.ciphers import (
    BlockCipherAlgorithm,
    CipherAlgorithm,
)
from cryptography.hazmat.primitives.ciphers.modes import ModeWithNonce

def _verify_key_size(algorithm, key):
    # Verify that the key is instance of bytes
    utils._check_byteslike("key", key)

# Verify that the key size matches the expected key size
    if len(key) * 8 not in algorithm.key_sizes:
        raise ValueError(
            "Invalid key size ({}) for {}.".format(
                len(key) * 8, algorithm.name
            )
        )
    return key

@utils.register_interface(BlockCipherAlgorithm)
@utils.register_interface(CipherAlgorithm)
class AES(object):
    name = "AES"
    block_size = 128
    # 512 added to support AES-256-XTS, which uses 512-bit keys
    key_sizes = frozenset([128, 192, 256, 512])

def __init__(self, key):
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(BlockCipherAlgorithm)
@utils.register_interface(CipherAlgorithm)
class Camellia(object):
    name = "camellia"
    block_size = 128
    key_sizes = frozenset([128, 192, 256])

def __init__(self, key):
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(BlockCipherAlgorithm)
@utils.register_interface(CipherAlgorithm)
class TripleDES(object):
    name = "3DES"
    block_size = 64
    key_sizes = frozenset([64, 128, 192])

def __init__(self, key):
        if len(key) == 8:
            key += key + key
        elif len(key) == 16:
            key += key[:8]
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(BlockCipherAlgorithm)
@utils.register_interface(CipherAlgorithm)
class Blowfish(object):
    name = "Blowfish"
    block_size = 64
    key_sizes = frozenset(range(32, 449, 8))

def __init__(self, key):
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(BlockCipherAlgorithm)
@utils.register_interface(CipherAlgorithm)
class CAST5(object):
    name = "CAST5"
    block_size = 64
    key_sizes = frozenset(range(40, 129, 8))

def __init__(self, key):
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(CipherAlgorithm)
class ARC4(object):
    name = "RC4"
    key_sizes = frozenset([40, 56, 64, 80, 128, 160, 192, 256])

def __init__(self, key):
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(CipherAlgorithm)
class IDEA(object):
    name = "IDEA"
    block_size = 64
    key_sizes = frozenset([128])

def __init__(self, key):
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(BlockCipherAlgorithm)
@utils.register_interface(CipherAlgorithm)
class SEED(object):
    name = "SEED"
    block_size = 128
    key_sizes = frozenset([128])

def __init__(self, key):
        self.key = _verify_key_size(self, key)

@property
    def key_size(self):
        return len(self.key) * 8

@utils.register_interface(CipherAlgorithm)
@utils.register_interface(ModeWithNonce)
class ChaCha20(object):
    name = "ChaCha20"
    key_sizes = frozenset([256])

def __init__(self, key, nonce):
        self.key = _verify_key_size(self, key)
        utils._check_byteslike("nonce", nonce)

if len(nonce) != 16:
            raise ValueError("nonce must be 128-bits (16 bytes)")

self._nonce = nonce

nonce = utils.read_only_property("_nonce")

@property
    def key_size(self):
        return len(self.key) * 8

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