Question

我想使用密码技术对用户输入的消息进行加密：

我有以下简单代码：

import os
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
backend = default_backend()
messages = input("Please, insert messages to encrypt: ")
key = os.urandom(24)
print(key)
cipher = Cipher(algorithms.TripleDES(key), modes.ECB(), backend=backend)
encryptor = cipher.encryptor()
cryptogram = encryptor.update(b"a secret message") + encryptor.finalize()
print(cryptogram)

当我在代码中以 b 前缀对消息“秘密消息” 进行硬编码时，它可以正常工作。我想做的是使用 messages variable从用户输入中获取文本。

messages = input("Please, insert messages to encrypt: ")

我已经尝试了几种方法来将字符串类型从输入转换为字节类型，然后将其传递给cryptoor.update方法，但对我没有任何帮助。

messages = input(b"Please, insert messages to encrypt: ")
cryptogram = encryptor.update(byte, message) + encryptor.finalize()
...

版本：

Python 3.7.0

密码学2.4

Mac OS

Answer 1

s = 'a secret message'
b = s.encode('utf-8')

Answer 2

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Oct  2 13:23:27 2018

@author: myhaspl
@email:myhaspl@myhaspl.com
@blog:dmyhaspl.github.io
"""
import os
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import padding
padder = padding.PKCS7(128).padder()
backend = default_backend()
key = os.urandom(32)
iv = os.urandom(16)
cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)
encryptor = cipher.encryptor()
messages = input("Please input your message: ")
messages=bytes(messages,"utf-8")
padded_data = padder.update(messages )
padded_data += padder.finalize()
print(padded_data)
ct = encryptor.update(padded_data) + encryptor.finalize()
decryptor = cipher.decryptor()
decryptorData=decryptor.update(ct) + decryptor.finalize()
unpadder = padding.PKCS7(128).unpadder()
data = unpadder.update(decryptorData)
print(data + unpadder.finalize())

Please input your message: hello,world! I am dmyhaspl.my blog is dmyhaspl.github.io
b'hello,world! I am dmyhaspl.my blog is dmyhaspl.github.io\x08\x08\x08\x08\x08\x08\x08\x08'
b'hello,world! I am dmyhaspl.my blog is dmyhaspl.github.io'
>>>

如何在python中将字符串变量转换为字节类型？

2 个答案: