23秋季学期期中考核（密码题）

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师兄新学的Decode姿势

题目给出的

    const SM4 = require("gm-crypt").sm4;
    var payload =
    "inu7s0XGslLFsPe0xok/nxqwtceG0cuMoh7hBbpwyNBrn3g/lMdcFYobv/K++eRgWwI/TIA4qMtjqpNKOet
    E3TD0gWoSknGF6OhkRJ3LxrNUZ/Mi8ISz3xrDLawIY8NwbalYcQUGWtVjdC3nJLmAAA67FmSCAn2EOcI1mAt
    9yMQ=";
    let sm4Config = {
    key: "B6*40.2_C9#e4$E3",
    mode: "ecb",
    cipherType: "base64"
    };
    let sm4 = new SM4(sm4Config);
    var result = sm4.decrypt(payload);
    console.log("解密:" + result)

询问后，因为需要node.js环境，就把他转换为python语言，这个是借用的

    from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
    from cryptography.hazmat.primitives.padding import PKCS7
    from cryptography.hazmat.backends import default_backend
    import base64

    payload = "inu7s0XGslLFsPe0xok/nxqwtceG0cuMoh7hBbpwyNBrn3g/lMdcFYobv/K++eRgWwI/TIA4qMtjqpNKOetE3TD0gWoSknGF6OhkRJ3LxrNUZ/Mi8ISz3xrDLawIY8NwbalYcQUGWtVjdC3nJLmAAA67FmSCAn2EOcI1mAt9yMQ="
    key = b'B6*40.2_C9#e4$E3'

    backend = default_backend()
    cipher = Cipher(algorithms.SM4(key), modes.ECB(), backend=backend)
    decryptor = cipher.decryptor()

    decoded_payload = base64.b64decode(payload)
    decrypted_data = decryptor.update(decoded_payload) + decryptor.finalize()

    unpadder = PKCS7(algorithms.SM4.block_size).unpadder()
    unpadded_data = unpadder.update(decrypted_data) + unpadder.finalize()

    print("解密：", unpadded_data.decode())