需要帮助使用密码学 fernet 进行解码

Question

我似乎无法使用加密中使用的密钥来

decrypt

行。并且总是收到“无效令牌”解密错误'

我希望使用该程序添加密码，对其进行加密，然后写入文件。如果您打开文件，您将看到的只是加密文本，并且只能使用程序本身查看您的密码。

这是我的代码：

from cryptography.fernet import Fernet
key = b'Sw42CeEyZCyRyct0Ly2loEga9D4iv6tF0WRiTLKVdDA='
fkey = Fernet(key)



def add():
    app = input("enter app name ").upper()
    name = input("enter account name ")
    password = input("enter account password ")
    with open("passwords2.txt", 'a') as f:

        original = "{}: {} | {} ".format(app, name, password)
        inbytes = original.encode()
        originalencrypted = fkey.encrypt(inbytes)
        f.write(str(originalencrypted) + "\n")


def read():
    with open("passwords2.txt", 'r') as f:
        for line in f:
            print(fkey.decrypt(line.strip().encode()).decode())


while True:
    operation = input("would you like to read, add, or quit (q) ")
    if operation == "read":
        read()
    elif operation == "add":
        add()
    elif operation == "q" or operation == "quit":
        quit()
    else:
        print("invalid input")

Answer 1

问题是

str(originalencrypted)

（它创建像这样的字符串

"b'...'"

，而不是使用某种定义的编码将

bytes

转换为

str

）。

您想要将

bytes

正确转换为

str

：

originalencrypted.decode('utf-8')

。

或者你想直接向文件写入字节：

with open("passwords2.txt", 'ab') as f:
  ...
  f.write(originalencrypted)
  f.write("\n".encode('utf-8'))