Question

我是tkinter库的新手。我已经搜索了足够的内容并调试了几个小时，但无法弄清楚解密为何不起作用。但是，如果不使用tkinter，则代码可以正常工作。

代码如下：

from cryptography.fernet import Fernet

key = Fernet.generate_key() # to make a key or to genrate a key
print(key)

from tkinter import *
root=Tk()

def clicked():
    input1 = ent1.get()
    FileName = str(input1)
    TextFile = open(FileName,"w")

    input2 = ent2.get()
    wrcont = str(input2)

    TextFile.write(wrcont)
    TextFile.close()

b1 = Button(root, text='SUBMIT',bg='light blue',fg='green',command=clicked)

b1.grid(row=2,sticky=E)

def encryption():
    print('In Encryption')
    input1 = ent1.get()
    FileName = str(input1)+".txt"
    TextFile = open(FileName,"w")
    with open(FileName,'rb') as TextFile:
        data = TextFile.read()
    fernet = Fernet(key)
    encrypted = fernet.encrypt(data)
    decrypted = fernet.decrypt(encrypted)
    print(encrypted)
    print('Decrypted')
    print(decrypted)
    TextFile.close()
    print(key)
    with open(FileName, 'wb') as TextFile:
        TextFile.write(encrypted)
    TextFile.close()    
b2 = Button(root,text='ENCRYPT',bg='red',command=encryption)
b2.grid(row=4,column=2)

#for decryption

# open the file to decryption
def decryption():
    input1 = ent1.get()
    file = str(input1)+".txt"
    #TextFile = open(file)
    print('In Decryption')
    print(file)
    with open(file,'rb') as TextFile:
        token = TextFile.read()
    TextFile.close() 
    print(token)
    #print(data)
    print(key)
    fernet = Fernet(key)
    decrypted = fernet.decrypt(token)
    print('decrypted data')
    print(decrypted)
# write the encrypted file
    file = file+"dec"
    with open(file, 'wb') as TextFile:
        TextFile.write(decrypted)
    TextFile.close()     
b3 = Button(root,text='DECRYPT',bg='red',command=decryption)
b3.grid(row=5,column=2)


l4 = Label(root,text='Enter file Name to Decrypt:',bg='light blue')
ent4 = Entry(root)

l4.grid(row=5,sticky=S)
ent4.grid(row=5,column=1)


l1 = Label(root, text='Enter your file name:',bg='light blue')
l2 = Label(root, text='Write some text into file:',bg='light blue')

ent1 = Entry(root)
ent2 = Entry(root)

l1.grid(row=0,sticky=E)
l2.grid(row=1,sticky=E)

ent1.grid(row=0,column=1,sticky=E)
ent2.grid(row=1,column=1,sticky=E)

l3 = Label(root, text='Enter file to encrypt:',bg='light blue')
ent3 = Entry(root)

l3.grid(row=4,sticky=E)
ent3.grid(row=4,column=1)


root.title('FILE ENC/DEC')
root.geometry('800x500')
root.configure(background='purple')
root.mainloop()

输出（控制台）：

b'QsQpCVnYOIQcdG-JjAwi_sw3Qqc7fB6eyeQ8zf9oPs4='
In Encryption
b'gAAAAABcrtxDIgMvDsYAV6GzpVVE3UYLZtwArC07E8johAQgOTbLUwjCJab1A4UnniZbtJOJiepRHcX04xKnCcdbpFktTHsqcQ=='
Decrypted
b''
b'QsQpCVnYOIQcdG-JjAwi_sw3Qqc7fB6eyeQ8zf9oPs4='
In Decryption
aaa.txt
b'gAAAAABcrtxDIgMvDsYAV6GzpVVE3UYLZtwArC07E8johAQgOTbLUwjCJab1A4UnniZbtJOJiepRHcX04xKnCcdbpFktTHsqcQ=='
b'QsQpCVnYOIQcdG-JjAwi_sw3Qqc7fB6eyeQ8zf9oPs4='
decrypted data
b''

任何帮助深表感谢。

Answer 1

您的加密功能中的行TextFile = open(FileName,"w")不正确，并导致了此错误。当您使用w打开要写入的文件时，该文件将立即被截断，因此所有内容都会丢失。然后，下一行在二进制读取模式下将其重新打开，但此时它将仅读取一个空字节字符串。然后，您的fernet实例会加密空字节字符串，解密后您（正确）看不到任何内容。

Tkinter：cryptography.fernet解密返回空白字符串（b''）

1 个答案: