我正在尝试读取一个字符串，将其加密，然后将其保存到文本文件中，然后读取该文本文件，然后读取已加密的字符串，并在python中对其进行解密

问题描述

我正在尝试读取一个字符串，将其加密，然后将其保存到文本文件中，然后再读取该文本文件，然后读取已加密的字符串，并在python中将其解密。字符串“]在开头和结尾，我还尝试将读取列表转换为二进制，但是将其作为b [” b'key'“]，任何想法

def write_key():                                #creating a key
    key = Fernet.generate_key()
    with open("key.key","wb") as key_file:
        key_file.write(key)

def load_key():                                 #reading the generated key
    return open("key.key","rb").read()

data = input()
data = bytes(data,'utf-8')                      #you cannot encrypt str do converting it to bytes
write_key()                                     #creating the key
key = load_key()                                #loading the key
f = Fernet(key)
encrypted = f.encrypt(data)                     #encrypting the data
print(encrypted)

file = open("encrypted.txt","w")               #writing the encrypted the data       
file.write("%s\n" %(encrypted))
file.close()

with open("encrypted.txt","r") as f:           #reading the encrypted the data
    rdata = [line.rstrip('\n') for line in f]    #removing \n as it is added while saving the txt file
print(rdata)


key = load_key()
f = Fernet(key)
decrypted_encrypted = f.decrypt(rdata)
print(decrypted_encrypted)

我得到的输出：

Enter the secret message: YOUR MESSAGE
Printing the encrypted message after encryption b'gAAAAABfWdNG64dvT-tpQA1EA-zYC8lsC4hL9EoZ0e008BMIWikfafT_FOmLyjWJh2dinGG8oi6VI16XCpwB1H4AZE2sk-ZgJQ=='
Printing the encrypted message after reading it from the txt file ["b'gAAAAABfWdNG64dvT-tpQA1EA-zYC8lsC4hL9EoZ0e008BMIWikfafT_FOmLyjWJh2dinGG8oi6VI16XCpwB1H4AZE2sk-ZgJQ=='"]
Traceback (most recent call last):

  File "C:\Users\Documents\Projects\temp.py",line 31,in <module>
    decrypted_encrypted = f.decrypt(rdata)

  File "C:\Users\anaconda3\lib\site-packages\cryptography\fernet.py",line 74,in decrypt
    timestamp,data = Fernet._get_unverified_token_data(token)

  File "C:\Users\anaconda3\lib\site-packages\cryptography\fernet.py",line 85,in _get_unverified_token_data
    utils._check_bytes("token",token)

  File "C:\Users\anaconda3\lib\site-packages\cryptography\utils.py",in _check_bytes
    raise TypeError("{} must be bytes".format(name))

TypeError: token must be bytes

解决方法

传递给decrypt的数据应该是字节而不是字符串。因此，这个问题。
从encrypted.txt进行读写时，请分别使用以下二进制模式。

def write_key():                                #creating a key
    key = Fernet.generate_key()
    with open("key.key","wb") as key_file:
        key_file.write(key)

def load_key():                                 #reading the generated key
    return open("key.key","rb").read()

data = input()
data = bytes(data,'utf-8')                      #you cannot encrypt str do converting it to bytes
write_key()                                     #creating the key
key = load_key()                                #loading the key
f = Fernet(key)
encrypted = f.encrypt(data)                     #encrypting the data

file = open("encrypted.txt","wb")               #writing the encrypted the data       
file.write(encrypted)
file.close()

with open("encrypted.txt","rb") as f:           #reading the encrypted the data
    rdata =f.read()

key = load_key()
f = Fernet(key)
decrypted_encrypted = f.decrypt(rdata)
print(decrypted_encrypted)