python - 生成流密码时出现错误 : Odd-length string (Python 3,)

Question

因为学校的原因，我开始学习如何使用 python，而且我真的没有遇到任何问题；然而，上周我们被分配制作一个流密码，但我真的很难使用它。代码如下:

import binascii

mode = 0

def asktodo():
    while True:
        print('Do you wish to encrypt or decrypt your message?')
        mode = input().lower()
        if mode in 'encrypt e decrypt d'.split():
            return mode
        else:
            print('Enter either "encrypt" or "e", or "decrypt" or "d".')

def message():
    inp = input('Input your message:\n')
    inp = inp.lower()
    return inp     

def gkey():
    nkey = int(input('Input your key:\n'))
    return nkey

def encrypt(plaintext,key):
    ciphered=""
    for x in plaintext:
        ptd=ord(x)
        cip=ptd^key
        ciphered=ciphered+chr(cip)
    ciphered=bytes(ciphered, 'utf-8')
    return binascii.hexlify(ciphered)

def decrypt(ciphered,key):
    ciphered=binascii.unhexlify(ciphered)
    ciphered=str(ciphered, 'utf-8')
    plain=''
    for x in ciphered:
        ctd=ord(x)
        descip=ctd^key
        plain=plain+chr(descip)
     return plain

mode = asktodo()
mess= message()
xkey = gkey()

if mode == 'e' or mode == 'encrypt':
    print(' ')
    print('Your encrypted message is:') 
    print(encrypt(mess, xkey))
else:
    print(' ')
    print('Your decrypted message is:') 
    print(decrypt(mess, xkey))

input()

加密部分工作完美。但是，当我尝试解密任何消息时，会弹出以下错误:

--line 33, in decrypt
   - ciphered=binascii.unhexlify(ciphered)

Error: Odd-length string

我已经尝试了很多方法并遵循了很多建议，但我就是无法解决它。

P.S.:在为您提供加密消息之前，代码会将值更改为十六进制。

Answer 1

我无法重现你的错误:

In [12]: import binascii                                                         
    ...:                                                                         
    ...: def asktodo():                                                          
    ...:     while True:                                                         
    ...:         mode = input('Do you wish to encrypt or decrypt your message?') 
    ...:         mode = mode.lower()                                             
    ...:         if mode in 'encrypt e decrypt d'.split():                       
    ...:             return mode                                                 
    ...:         else:                                                           
    ...:             print('Enter either "encrypt" or "e", or "decrypt" or "d".')
    ...:                                           
    ...: def message():                            
    ...:     inp = input('Input your message:\n')  
    ...:     inp = inp.lower()                     
    ...:     return inp                            
    ...:                                           
    ...: def gkey():
    ...:     nkey = int(input('Input your key:\n'))
    ...:     return nkey
    ...: 
    ...: def encrypt(plaintext,key):
    ...:     ciphered=""
    ...:     for x in plaintext:
    ...:         ptd=ord(x)
    ...:         cip=ptd^key
    ...:         ciphered=ciphered+chr(cip)
    ...:     ciphered=bytes(ciphered, 'utf-8')
    ...:     return binascii.hexlify(ciphered)
    ...: 
    ...: def decrypt(ciphered,key):
    ...:     ciphered=binascii.unhexlify(ciphered)
    ...:     ciphered=str(ciphered, 'utf-8')
    ...:     plain=''
    ...:     for x in ciphered:
    ...:         ctd=ord(x)
    ...:         descip=ctd^key
    ...:         plain=plain+chr(descip)
    ...:     return plain
    ...: 
    ...: print('')
    ...: mess= message()
    ...: xkey = gkey()
    ...: print('Your encrypted message is:') 
    ...: print(encrypt(mess, xkey))
    ...: 
    ...: print('')
    ...: mess= message()
    ...: xkey = gkey()
    ...: print('Your decrypted message is:') 
    ...: print(decrypt(mess, xkey))
    ...: 
    ...:     

Input your message:
test1
Input your key:
123
Your encrypted message is:
b'0f1e080f4a'

Input your message:
0f1e080f4a
Input your key:
123
Your decrypted message is:
test1

我猜，您很可能正在输入字节字符串表示形式，包括 b 和撇号。也就是说，在解密部分你可能输入:

Input your message:
b'0f1e080f4a'

那个 字符串有奇数个字符(不应该)。