python - urlsafe_b64decode：返回 binascii.a2b

问题描述

我正在cryptography按照教程学习 python 。

这是代码：

import os 
import base64
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC

BASE_DESTINATION = os.path.dirname(os.path.abspath(__file__))
KEY_DESTINATION = os.path.join(BASE_DESTINATION, 'keys/')

def generate_key_from_password(path = KEY_DESTINATION):
    passwordProvided = str(input("Enter Password: ")) # enter your password
    password = passwordProvided.encode()
    salt =  os.urandom(16)
    # salt = b'aeroplane'
    
    kdf = PBKDF2HMAC(
        algorithm= hashes.SHA256(),
        length= 32,
        salt= salt,
        iterations= 100_000,
        backend = default_backend()
    )
    key = base64.urlsafe_b64decode(kdf.derive(password)) # generated successed!
    
    print("key: ", key)
   generate_key_from_password()

当生成密钥时base64.urlsafe_b64decode(kdf.derive(password))出现错误：binascii.Error: Invalid base64-encoded string: number of data characters (5) cannot be 1 more than a multiple of 4

我访问了很多答案，但没有什么真正适合我的代码。即：我在密码字符串中添加了'='and'=='来解决填充问题并通过计算添加填充password = str(password) + ('=' * len(password))，但它也不起作用。

这是完整的错误：

Enter Password: pass

Traceback (most recent call last):
  File "gfp.py", line 33, in <module>
    generate_key_from_password()
  File "gfp.py", line 28, in generate_key_from_password
    key = base64.urlsafe_b64decode(kdf.derive(password)) # generated successed!
  File "C:\Users\user\Anaconda3\envs\IRIS-REC\lib\base64.py", line 133, in urlsafe_b64decode
    return b64decode(s)
  File "C:\Users\user\Anaconda3\envs\IRIS-REC\lib\base64.py", line 87, in b64decode

    return binascii.a2b_base64(s)
binascii.Error: Invalid base64-encoded string: number of data characters (5) cannot be 1 more than a multiple of 4

标签： pythoncryptographybase64

解决方案由@Topaco 在评论中提供。（谢谢！）

问题出在语法上。

它应该base64.urlsafe_b64encode(...)代替base64.urlsafe_b64decode(kdf.derive(password)). 我已经多次看过代码，但不知何故我每次都错过了这个。

谢谢@topaco

python - urlsafe_b64decode：返回 binascii.a2b_base64(s)

问题描述

解决方案

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