Python RSA加密

Question

我正在嘗試編寫RSA加密軟件工具，該工具每次都會使用相同的密鑰。 這是我到目前為止所擁有的。

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行指向<符號的地方出現語法錯誤。 我知道這是有效的私鑰。 有什么問題以及如何解決。 我也在用python 2.7.3

[編輯]我從此代碼中獲取了密鑰

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()

另外，我在“ raw_input（）”之后從此代碼中得到“不支持RSA密鑰格式的錯誤”

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>不是有效的密鑰，不確定如何獲取，但僅是作為Python對象的密鑰的字符串表示形式， 則不會顯示實際的密鑰內容，還請注意，您無法使用此字符串表示形式重建密鑰對象 。

在使用密鑰進行RSA加密之前，您應該從文件 ， 在內存中生成等位置導入密鑰。

因此，您應該做的是：

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

其中externKey是字符串，因此您可以通過這種方式從密鑰文件中加載密鑰字符串。

或 ：

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

其中bits是密鑰的強度，例如2048。

無論哪種方式，您都將返回一個RSA密鑰對象（ _RSAobj ），然后可以像其余代碼一樣進行加密。

[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)