使用Python的密钥导出函数

# import utility for Base64 encodingimport base64# import Fernetfrom cryptography.fernet import Fernetfrom cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMACfrom cryptography.hazmat.primitives import hashes# import getpass for secure input readingfrom getpass import getpass# read plain text passwordplain_text_password: str = getpass(prompt='Password: ')# convert the password to bytespassword_bytes = plain_text_password.encode('utf-8')# some salt value for demonstration, use a secure random value in practicesalt = b'' * 16# use PBKDF2HMAC to derive a secure key from the passwordkdf = PBKDF2HMAC(    algorithm=hashes.SHA256(),    length=32,    salt=salt,    iterations=100000)# encode the derived key with Base64key = base64.urlsafe_b64encode(kdf.derive(password_bytes))# create a Fernet instance with the derived keyfernet = Fernet(key)# data to be encrypteddata = b'Some secret data'# encrypt the dataencrypted_data = fernet.encrypt(data)# decrypt the datadecrypted_data = fernet.decrypt(encrypted_data)# print the decrypted dataprint(f"Decrypted text: {decrypted_data.decode()}")