Python unhexlify十六進制到alpha轉換失敗

Question

所以我使用this SO answer的代碼創建一個雙向字母數字加密函數。

基本上，功能是這樣的：

from Crypto import Random 
from Crypto.Cipher import AES 

from binascii import hexlify 
from binascii import unhexlify 

def encrypt_password(self, password): 
    key = current_app.config['VAULT_KEY'] 
    iv = Random.new().read(AES.block_size) 
    cipher = AES.new(key.strip("\'"), AES.MODE_CFB, iv) 
    self.password_encrypted = hexlify(iv + cipher.encrypt(password)) 

def decrypt_password(self): 
    key = current_app.config['VAULT_KEY'] 
    encrypted = unhexlify(self.password_encrypted) 
    cipher = AES.new(key.strip("\'"), AES.MODE_CFB, encrypted[:AES.block_size]) 
    return cipher.decrypt(encrypted)[AES.block_size:] 

這些功能進行交互瓦特/，節省的encrypt_password結果的數據庫對象;解密，使用decrypt_password。 （不言自明。）

我被陷在這條線：

encrypted = unhexlify(self.password_encrypted) 

不知何故，Python會告訴我，self.password_encrypted不是一個十六進制數字。我不知道b/c上發生了什麼，它以十六進制數字形式保存到對象中。

順便說一句，字符串表示形式是：'\x[decimal numbers]'，我也覺得很奇怪。它不應該是十六進制數字嗎？

回溯如下：

Traceback (most recent call last): 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 2000, in __call__ 
    return self.wsgi_app(environ, start_response) 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 1991, in wsgi_app 
    response = self.make_response(self.handle_exception(e)) 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 1567, in handle_exception 
    reraise(exc_type, exc_value, tb) 
    File "/<>/venv/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise 
    raise value 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 1988, in wsgi_app 
    response = self.full_dispatch_request() 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 1641, in full_dispatch_request 
    rv = self.handle_user_exception(e) 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 1544, in handle_user_exception 
    reraise(exc_type, exc_value, tb) 
    File "/<>/venv/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise 
    raise value 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 1639, in full_dispatch_request 
    rv = self.dispatch_request() 
    File "/<>/venv/lib/python3.5/site-packages/flask/app.py", line 1625, in dispatch_request 
    return self.view_functions[rule.endpoint](**req.view_args) 
    File "/<>/app/public/views.py", line 64, in test_queue 
    return u.decrypt_password() 
    File "/<>/app/models.py", line 80, in decrypt_password 
    encrypted = unhexlify(self.password_encrypted) 
binascii.Error: Non-hexadecimal digit found 

Answer 1

好了，所以我做了一些修改，您發佈的文件...

from Crypto import Random 
from Crypto.Cipher import AES 

from binascii import hexlify, unhexlify 

import hashlib 
from sys import stdout as puts 

class AESCipher: 

     def __init__(self, key): 
      self.key = key 

     def encrypt_password(self, password): 
     iv = Random.new().read(AES.block_size) 
     cipher = AES.new(self.key, AES.MODE_CFB, iv) 
     self.password_encrypted = hexlify(iv + cipher.encrypt(password)) 
     return self.password_encrypted 

     def decrypt_password(self): 
      decrypted = unhexlify(self.password_encrypted) 
      cipher = AES.new(self.key, AES.MODE_CFB, decrypted[:AES.block_size]) 
      return cipher.decrypt(decrypted)[AES.block_size:] 


############################################################################# 
       """sample purposes only""" 

"""Here's an example, you don't have to use stdout or the block size for encyrption 
    I decided to use the regular base 16 block size and for 'puts' I came from a 
    ruby background""" 

retrive_password = AESCipher(hashlib.sha256("mylittlepony").digest()) 

puts.write(("\n"*3) + retrieve_password.encrypt_password("agenericpassword") + ("\n" *3)) 

puts.flush() 

puts.write(retrive_password.decrypt_password() + ("\n" *3)) 

puts.flush(() 

它可能有一些與你的環境的關鍵變量，確保它符合16,24或32字節的構造。爲AES初始化第一個參數。

至於 '\ X {0-9A-FA-F} {0-9A-FA-F}' 格式，以我的理解，是一個字符串格式的十六進制輸出