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python - PyCryptoDome AES CBC 文档代码给出不同的输出

问题描述

我正在使用PyCryptoDome AES CBC 文档中提供的代码。

import json
from base64 import b64encode
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad
from Crypto.Random import get_random_bytes

data = b"secret"
key = get_random_bytes(16)
cipher = AES.new(key, AES.MODE_CBC)
ct_bytes = cipher.encrypt(pad(data, AES.block_size))
iv = b64encode(cipher.iv).decode('utf-8')
ct = b64encode(ct_bytes).decode('utf-8')
result = json.dumps({'iv':iv, 'ciphertext':ct})
print(result)

预期的输出是：

{"iv": "bWRHdzkzVDFJbWNBY0EwSmQ1UXFuQT09", "ciphertext": "VDdxQVo3TFFCbXIzcGpYa1lJbFFZQT09"}

但是我得到的输出（相同的复制粘贴代码是）：

{"iv": "PnMwNa/dPBGSkg5LeJ++1g==", "ciphertext": "OGTvHSp2O4dGgfbKbXpSzA=="}

我认为问题可能是由随机密钥引起的，所以我循环运行了 20 次：

import json
from base64 import b64encode
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad
from Crypto.Random import get_random_bytes

print('Result should be like\n{"iv": "bWRHdzkzVDFJbWNBY0EwSmQ1UXFuQT09", "ciphertext": "VDdxQVo3TFFCbXIzcGpYa1lJbFFZQT09"}')

for x in range(0, 20):
    data = b"secret"
    key = get_random_bytes(16)
    cipher = AES.new(key, AES.MODE_CBC)
    ct_bytes = cipher.encrypt(pad(data, AES.block_size))
    iv = b64encode(cipher.iv).decode('utf-8')
    ct = b64encode(ct_bytes).decode('utf-8')
    result = json.dumps({'iv':iv, 'ciphertext':ct})
    print(result)

可悲的是，所有结果都是相似的：

Result should be like
{"iv": "bWRHdzkzVDFJbWNBY0EwSmQ1UXFuQT09", "ciphertext": "VDdxQVo3TFFCbXIzcGpYa1lJbFFZQT09"}
{"iv": "PnMwNa/dPBGSkg5LeJ++1g==", "ciphertext": "OGTvHSp2O4dGgfbKbXpSzA=="}
{"iv": "FR9GQqA3tssPKn2YHhHe4w==", "ciphertext": "FM3CLY51i0Gvctr9efXGDg=="}
{"iv": "ocsVcOggvjUXj8s2IHXbUg==", "ciphertext": "mR3mYEK4M3QhtUmPt6jwuA=="}
{"iv": "TCox/Pfv5Xjkrm8z3weJ0w==", "ciphertext": "DkkGKXvXpV4B8pV5B4ctxw=="}
{"iv": "eZvCrk97EC4eL1kO5PQ+Dg==", "ciphertext": "idaLj7wl/F79qUdzZodbBg=="}
{"iv": "KqwaWZTxU5ZFn6Ekq/wWEg==", "ciphertext": "A25LP0wNTJRkndhvuhuasw=="}
{"iv": "FlFNCnQHmUajP2jNDvIiLw==", "ciphertext": "T9vOu0z9DkUrXCUGqXacxw=="}
{"iv": "U74vTvWZNhKbp5sq9uT9Sg==", "ciphertext": "vfJ1Brftb897O6xTMI3MQg=="}
{"iv": "tIVgKly8wyhpwdoRQ6SzqA==", "ciphertext": "EjnyNuIPVmt7cnEaFSsoww=="}
{"iv": "5qoVwEB7WfHGSGZvHY25Hg==", "ciphertext": "RBxS7gIMAfZqS5a9vTEcjQ=="}
{"iv": "NCHdCr09s9pMQsHK+4ECjA==", "ciphertext": "V8ezqaw8WrrygrokrD48ew=="}
{"iv": "x+T+fM3diahDBie4o7fvpA==", "ciphertext": "0xnjaIArYsfKn5JkjXnniQ=="}
{"iv": "v0r3123VCkZy7zOVixyBkA==", "ciphertext": "J2U0MEHqDEwC45UCY7+SdA=="}
{"iv": "l1iA//cLxESUax39ZanyRw==", "ciphertext": "QLC74BydGuQ1J73PUvKl+Q=="}
{"iv": "FcsfeZ3iCrVVaRsZSm3Gsw==", "ciphertext": "wyiZEo1VpdM/u+ucstzn6Q=="}
{"iv": "av6FSkAzfkOyfLvxDIHY9g==", "ciphertext": "EuexPtCb69+37F9INqWemw=="}
{"iv": "a8F+8OEv1ieHcgwMXocEww==", "ciphertext": "6rd04diPiA7tw/4MgIJsWw=="}
{"iv": "jUY115jhERX2KI+dtVajlQ==", "ciphertext": "TRC5RR3qX6EDjjH1kmO6ew=="}
{"iv": "fcW66kw4gpEWRvNf3AQg7g==", "ciphertext": "o1G6luiDT1Cf2bmZlTu57A=="}
{"iv": "U5FbVnDONa0h4Q6PDJo60A==", "ciphertext": "ilGJKuKNxUxx/Lxz5N85NQ=="}

所以，我的问题是，什么可能导致这种不匹配？另外，请注意 IV 大小与预期输出相比是错误的

标签： pythonaescbc-modepycryptodome

解决方案

事实证明代码正在运行，并且文档的输出有问题，请记住在尝试解码以将 IV 和密码解码为 HEX 时

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