76 lines
2.9 KiB
Python
76 lines
2.9 KiB
Python
import os
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from mnemonic import Mnemonic
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from Crypto.Cipher import AES
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from Crypto.Protocol.KDF import PBKDF2
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from Crypto.Util.Padding import pad, unpad
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class SentinelVault:
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def __init__(self, salt=b'Sentinel_Salt_2026'): # 固定的盐值，用于增加派生强度
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self.mnemo = Mnemonic("english")
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self.salt = salt
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def derive_key(self, mnemonic_phrase):
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"""
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使用 PBKDF2 将助记词转换为 AES-256 密钥 (32 bytes)
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"""
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# 种子生成遵循 BIP-39 逻辑
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seed = self.mnemo.to_seed(mnemonic_phrase, passphrase="")
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# 派生出一个 32 字节的强密钥
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key = PBKDF2(seed, self.salt, dkLen=32, count=100000)
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return key
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def encrypt_data(self, key, plaintext):
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"""
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使用 AES-256 GCM 模式进行加密 (具备完整性校验)
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"""
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cipher = AES.new(key, AES.MODE_GCM)
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nonce = cipher.nonce
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ciphertext, tag = cipher.encrypt_and_digest(plaintext.encode('utf-8'))
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# 返回：随机数 + 校验位 + 密文
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return nonce + tag + ciphertext
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def decrypt_data(self, key, encrypted_blob):
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"""
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AES-256 GCM 解密
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"""
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nonce = encrypted_blob[:16]
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tag = encrypted_blob[16:32]
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ciphertext = encrypted_blob[32:]
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cipher = AES.new(key, AES.MODE_GCM, nonce=nonce)
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try:
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plaintext = cipher.decrypt_and_verify(ciphertext, tag)
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return plaintext.decode('utf-8')
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except ValueError:
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return "【解密失败】：密钥错误或数据被篡改"
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if __name__ == "__main__":
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# --- 模拟 Sentinel 协议完整业务流 ---
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# 1. 假设这是通过之前 SSS 算法恢复出来的 12 词
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recovered_mnemonic = "apple banana cherry dog elephant fish goat horse ice jacket kangaroo lion"
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try:
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with open("words.txt", "r") as f:
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recovered_mnemonic = f.read().strip()
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except FileNotFoundError:
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print("words.txt 文件未找到，使用默认助记词进行演示。")
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print(f"Demo助记词：{recovered_mnemonic}")
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vault = SentinelVault()
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# 2. 生成加密密钥
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aes_key = vault.derive_key(recovered_mnemonic)
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aes_key_hex = aes_key.hex()
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print(f"【密钥派生完成】：len:{len(aes_key_hex)} -> {aes_key_hex[:20]}...")
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# 3. 用户生前加密资产（如：银行账户、数字遗产）
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my_legacy = "我的瑞士银行账号是：CH123456789，密码是：Sentinel2026"
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print(f"【Demo资产信息】：{my_legacy}")
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encrypted_asset = vault.encrypt_data(aes_key, my_legacy)
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encrypted_asset_hex = encrypted_asset.hex()
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print(f"【数据已加密】：len:{len(encrypted_asset_hex)} -> {encrypted_asset_hex[:40]}...")
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# 4. 模拟继承人通过分片拼凑后进行解密
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print("-" * 50)
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decrypted_content = vault.decrypt_data(aes_key, encrypted_asset)
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print(f"【继承人解密成功】：{decrypted_content}") |