Python - How can I send a rsa.key.PublicKey object through socket?

Question

I'm using the python rsa module to generate a public/private key pair. I want to send the public key to the other computer through a socket connection.

When I try to encode the public key to send it, I get this error:

  File "chatclient.py", line 128, in <module>
    s.sendall(pubkey.encode('utf-8'))
AttributeError: 'PublicKey' object has no attribute 'encode'

I cannot figure out a way to encode the key other than the method that causes the error. If I try to convert it to a string, encode it and send it through, I cannot use the key to encrypt any messages, nor are there any documented ways to turn it back into a PublicKey object.

This is what causes the error:

s.sendall(pubkey.encode('utf-8'))

Here's the package on pypi and the documentation:

https://pypi.org/project/rsa/

https://stuvel.eu/python-rsa-doc/usage.html

What package do you use here? Where is the PublicKey class defined? — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Aug 4, 2019 at 10:09
the .encode is usually a string thing what type of object is pubkey? check to see if it already haves a bytes or to_bytes method — Nullman
– Nullman, Commented Aug 4, 2019 at 10:13
@Nullman I've checked at stuvel.eu/python-rsa-doc/reference.html, and the class rsa.PublicKey doesn't have anything like that. — CatCraftYT
– CatCraftYT, Commented Aug 4, 2019 at 10:21
You should be able to save the key as a string with save_pkcs1 and load it from said string with load_pkcs1. — ForceBru
– ForceBru, Commented Aug 4, 2019 at 11:01

CatCraftYT · Accepted Answer · 2019-08-04 11:18:54Z

5

Use save_pkcs1 and load_pkcs1:

a = pubkey.save_pkcs1(format='DER')
b = rsa.key.PublicKey.load_pkcs1(a, format='DER')

answered Aug 4, 2019 at 11:18

CatCraftYT

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