55：要素3总结：AES-256+去中心化的永恒匿名堡垒代码实现

import cryptography
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
import os

class AES256Encryptor:
    def __init__(self, key=None):
        # 生成256位密钥
        self.key = key if key else os.urandom(32)
        self.backend = default_backend()
    
    def encrypt(self, plaintext):
        """加密数据"""
        # 生成随机IV
        iv = os.urandom(16)
        # 创建加密器
        cipher = Cipher(algorithms.AES(self.key), modes.CBC(iv), backend=self.backend)
        encryptor = cipher.encryptor()
        # 填充数据
        padding_length = 16 - (len(plaintext) % 16)
        padded_plaintext = plaintext + bytes([padding_length]) * padding_length
        # 加密
        ciphertext = encryptor.update(padded_plaintext) + encryptor.finalize()
        return iv + ciphertext
    
    def decrypt(self, ciphertext):
        """解密数据"""
        # 提取IV
        iv = ciphertext[:16]
        actual_ciphertext = ciphertext[16:]
        # 创建解密器
        cipher = Cipher(algorithms.AES(self.key), modes.CBC(iv), backend=self.backend)
        decryptor = cipher.decryptor()
        # 解密
        plaintext = decryptor.update(actual_ciphertext) + decryptor.finalize()
        # 去除填充
        padding_length = plaintext[-1]
        return plaintext[:-padding_length]

import requests
import ipfshttpclient

class DecentralizedNetwork:
    def __init__(self, tor_proxy="socks5h://localhost:9050", ipfs_api="/ip4/127.0.0.1/tcp/5001/http"):
        self.tor_proxy = tor_proxy
        self.ipfs_client = ipfshttpclient.connect(ipfs_api)
    
    def send_command(self, command):
        """通过Tor网络发送命令"""
        session = requests.session()
        session.proxies = {
            'http': self.tor_proxy,
            'https': self.tor_proxy
        }
        
        # 加密命令
        encryptor = AES256Encryptor()
        encrypted_command = encryptor.encrypt(command.encode())
        
        # 存储到IPFS
        ipfs_hash = self.ipfs_client.add_bytes(encrypted_command)
        
        # 通过Tor网络通知执行节点
        # 实际实现中需要设计节点发现机制
        execution_nodes = self._discover_nodes()
        for node in execution_nodes:
            session.post(node + "/execute", json={"ipfs_hash": ipfs_hash})
        
        return ipfs_hash
    
    def _discover_nodes(self):
        """发现执行节点"""
        # 实现节点发现逻辑
        return ["http://example.onion/execute"]

from cryptography.hazmat.primitives.asymmetric import rsa, padding
from cryptography.hazmat.primitives import hashes
import shamir

class DistributedKeyManager:
    def __init__(self, threshold=3, total_nodes=5):
        self.threshold = threshold
        self.total_nodes = total_nodes
        self.key_shares = {}
    
    def generate_key(self):
        """生成密钥并分片"""
        # 生成主密钥
        private_key = rsa.generate_private_key(
            public_exponent=65537,
            key_size=2048,
            backend=default_backend()
        )
        
        # 使用Shamir秘密共享算法分片
        key_bytes = private_key.private_bytes(
            encoding=cryptography.hazmat.primitives.serialization.Encoding.PEM,
            format=cryptography.hazmat.primitives.serialization.PrivateFormat.PKCS8,
            encryption_algorithm=cryptography.hazmat.primitives.serialization.NoEncryption()
        )
        
        # 生成密钥份额
        shares = shamir.split(self.threshold, self.total_nodes, key_bytes)
        for i, share in enumerate(shares):
            self.key_shares[f"node_{i+1}"] = share
        
        return self.key_shares
    
    def reconstruct_key(self, shares):
        """从份额重建密钥"""
        if len(shares) < self.threshold:
            raise ValueError("Not enough shares to reconstruct the key")
        
        key_bytes = shamir.combine(shares)
        private_key = cryptography.hazmat.primitives.serialization.load_pem_private_key(
            key_bytes,
            password=None,
            backend=default_backend()
        )
        
        return private_key