如何在不出现 TokenError 的情况下使用 Python fernet 加密和解密文件？

Question

我正在尝试制作一个登录程序，在不使用时加密登录文件。该程序不断引发“InvalidToken”错误。有谁知道如何解决这一问题？代码可能还有其他问题，所以如果您发现任何问题，也请告诉我。我的代码如下。我没有使用所有导入的模块，但我把它们放在那里以备后用。

import tkinter
import math
import os
import cryptography
from cryptography.fernet import Fernet

key = b'LjCWah7vQJCyL80Qurd17gYewzrZ11zvzs9JDQMxDOg='
f = Fernet(key)

create_logins_file = open("Random Scripts\Login Program\logins.txt", "w")
create_logins_file.close()

with open("Random Scripts\Login Program\logins.txt", "rb") as original_file:
    original_content = original_file.read()

decrypted = f.decrypt(original_content)

with open("Random Scripts\Login Program\logins.txt", "wb") as decrypted_file:
    decrypted_file.write(decrypted)

# The login function #
def login(username, password, file_path):
    file_new = open(file_path, "a")
    file_new.close()

    file = open(file_path, "r")
    file_content = file.read()
    print(file_content)
    file.close()

    if f"{username},{password}" in file_content[:]:
        return "You were logged in successfully"
    else:
        return "We could not find your account. Please check your spelling and try again."

# The account creation function #
def newaccount(username, password, file_path):
    file_new = open(file_path, "a")
    file_new.close()

    file = open(file_path, "r")
    file_content = file.read()
    print(file_content)
    file.close()

    file_append = open(file_path, "a")

    if f"{username},{password}" in file_content[:]:
        file_append.close()
        return "You already have an account, and were logged in successfully"
    else:
        file_append.write(username + "," + password + "\n")
        file_append.close()
        return "New account created."        

logins_path = "Random Scripts\Login Program\logins.txt"

signin_message = input("Would you like to: \n1. Create an account \nor \n2. Log in\n")
if signin_message == "1":
    print("User chose to create account")
    newacc_username = input("Input a username: ")
    newacc_password = input("Input a password: ")
    print(newaccount(newacc_username, newacc_password, logins_path))
elif signin_message == "2":
    print("User chose to log in")
    username = input("Input your username: ")
    password = input("Input your password: ")
    print(login(username, password,logins_path))
else:
    print("Please enter 1 or 2")

with open("Random Scripts\Login Program\logins.txt", "rb") as new_original_file:
    new_original_content = new_original_file.read()

encrypted = f.encrypt(new_original_content)

with open("Random Scripts\Login Program\logins.txt", "wb") as encrypted_file:
    encrypted_file.write(encrypted)

Answer 1

您的代码工作正常，问题是您尝试解密一个空文件然后验证其真实性。所以你需要创建这个文件并尝试将任何东西加密到这个文件中然后你可以再次解密这个文件。

import tkinter
import math
import os
import cryptography
from cryptography.fernet import Fernet

key = b'LjCWah7vQJCyL80Qurd17gYewzrZ11zvzs9JDQMxDOg='
f = Fernet(key)

create_logins_file = open("Random Scripts\Login Program\logins.txt", "wb")
    # encrypt anything
create_logins_file.write(f.encrypt(b"hello"))
create_logins_file.close()

with open("Random Scripts\Login Program\logins.txt", "rb") as original_file:
    original_content = original_file.read()
decrypted = f.decrypt(original_content)

with open("Random Scripts\Login Program\logins.txt", "wb") as decrypted_file:
    decrypted_file.write(decrypted)

# The login function #
def login(username, password, file_path):
    file_new = open(file_path, "a")
    file_new.close()

    file = open(file_path, "r")
    file_content = file.read()
    print(file_content)
    file.close()

    if f"{username},{password}" in file_content[:]:
        return "You were logged in successfully"
    else:
        return "We could not find your account. Please check your spelling and try again."

# The account creation function #
def newaccount(username, password, file_path):
    file_new = open(file_path, "a")
    file_new.close()

    file = open(file_path, "r")
    file_content = file.read()
    print(file_content)
    file.close()

    file_append = open(file_path, "a")

    if f"{username},{password}" in file_content[:]:
        file_append.close()
        return "You already have an account, and were logged in successfully"
    else:
        file_append.write(username + "," + password + "\n")
        file_append.close()
        return "New account created."        

logins_path = "Random Scripts\Login Program\logins.txt"

signin_message = input("Would you like to: \n1. Create an account \nor \n2. Log in\n")
if signin_message == "1":
    print("User chose to create account")
    newacc_username = input("Input a username: ")
    newacc_password = input("Input a password: ")
    print(newaccount(newacc_username, newacc_password, logins_path))
elif signin_message == "2":
    print("User chose to log in")
    username = input("Input your username: ")
    password = input("Input your password: ")
    print(login(username, password,logins_path))
else:
    print("Please enter 1 or 2")

with open("Random Scripts\Login Program\logins.txt", "rb") as new_original_file:
    new_original_content = new_original_file.read()

encrypted = f.encrypt(new_original_content)

with open("Random Scripts\Login Program\logins.txt", "wb") as encrypted_file:
    encrypted_file.write(encrypted)

如何在不出现 TokenError 的情况下使用 Python fernet 加密和解密文件？

How do I encrypt and decrypt files with Python fernet without getting TokenError?

python

encryption

cryptography