Python的RSA加密

Question

我想寫一個RSA加密軟件工具，每次使用相同的密鑰。這是我到目前爲止。

import Crypto 
from Crypto.PublicKey import RSA 
from Crypto import Random 

key = <_RSAobj @0x24b6348 n<1024>,e,d,p,q,u,private> 
publickey = key.publickey() 
encrypted = publickey.encrypt('hi', 32) 
print(encrypted) 

我在第5行得到一個語法錯誤，指向<符號。我知道這是一個有效的私鑰。有什麼問題，我該如何解決。另外我使用Python 2.7.3

[編輯]我從這個代碼

import Crypto 
from Crypto.PublicKey import RSA 
from Crypto import Random 
import os 
random_generator = Random.new().read 
key = RSA.generate(1024, random_generator) 
print(key) 
raw_input() 

而且我得到這個代碼「不支持錯誤RSA密鑰格式」的「後的raw_input的關鍵（ ）」

import Crypto 
from Crypto.PublicKey import RSA 
from Crypto import Random 
text_file = open("keyfile.txt", "w") 
text_file.write('<_RSAobj @0x24b6348 n<1024>,e,d,p,q,u,private>') 
text_file.close() 
raw_input() 
with open('keyfile.txt', 'r') as f: 
    externKey = f.readline() 
key = RSA.importKey(externKey, passphrase=None) 
publickey = key.publickey() 
encrypted = publickey.encrypt('hi', 32) 
print(encrypted) 

Answer 1

首先，<_RSAobj @0x24b6348 n<1024>,e,d,p,q,u,private>是不是一個有效的關鍵，不知道你是如何得到這個，但它是你的關鍵的Python對象的字符串表示只，實際的核心內容是沒有出現，也請注意，您無法重建具有此字符串表示的關鍵對象。

在你做RSA加密你的鑰匙，你應該從某個地方輸入你的鑰匙像文件，生成內存等

所以，你應該做的是：

key = RSA.importKey(externKey, passphrase=None) 

其中externKey是一個字符串，因此您可以用這種方式從您的密鑰文件加載密鑰字符串。

或者：

key = RSA.generate(bits, randfunc=None, progress_func=None, e=65537) 

凡bits是你的關鍵的力量，如2048

無論哪種方式，你將有一個RSA密鑰對象（_RSAobj）返回，那麼你可以做加密與其他代碼一樣。

[編輯]完整代碼

import Crypto 
from Crypto.PublicKey import RSA 

#Quick way to generate a new key 
private_key = RSA.generate(1024) 

#Show the real content of the private part to console, be careful with this! 
print(private_key.exportKey()) 

#Get the public part 
public_key = private_key.publickey() 

#Show the real content of the public part to console 
print(public_key.exportKey()) 

#Save both keys into some file for future usage if needed 
with open("rsa.pub", "w") as pub_file: 
    pub_file.write(public_key.exportKey()) 

with open("rsa.pvt", "w") as pvt_file: 
    pvt_file.write(private_key.exportKey()) 

#Load public key back from file and we only need public key for encryption 
with open('rsa.pub', 'r') as pub_file: 
    pub_key = RSA.importKey(pub_file.read()) 

#Encrypt something with public key and print to console 
encrypted = pub_key.encrypt('hello world', None) # the second param None here is useless 
print(encrypted) 

#Load private key back from file and we must need private key for decryption 
with open('rsa.pvt', 'r') as pvt_file: 
    pvt_key = RSA.importKey(pvt_file.read()) 

#Decrypt the text back with private key and print to console 
text = pvt_key.decrypt(encrypted) 
print(text)