How to encrypt a string using python Openssl public key?

Question

My current code to generate an OpenSSL public-private key pair:

import OpenSSL

key = OpenSSL.crypto.PKey()
key.generate_key(OpenSSL.crypto.TYPE_RSA, 2048)
public_key = OpenSSL.crypto.dump_publickey(OpenSSL.crypto.FILETYPE_PEM, key)
private_key = OpenSSL.crypto.dump_privatekey(OpenSSL.crypto.FILETYPE_PEM, key)
print(public_key, private_key, sep="\n")

Torxed · Accepted Answer · 2022-10-22 09:55:48Z

0

The documentation recommends that you call key.to_cryptography_key() to get a cryptographic key, and then use pyca/cryptography to perform the encryption.

https://www.pyopenssl.org/en/stable/api/crypto.html

Given your crypto key:

result = crypto_key.encrypt(b"Hello there")

I should add, RSA is primary intended for signatures and verification, and key exchange. It's way too slow for general encryption.

edited Oct 22, 2022 at 9:55

Torxed

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answered May 26, 2022 at 1:41

Frank Yellin

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2 Comments

Flow Over a year ago

Yes, I do know that RSA is slow am using it to send symmetric keys across a server client.

Frank Yellin Over a year ago

Sorry then. Just making sure. When someone says "I want to encrypt using RSA", I need to both answer the question and make sure they understand what they're doing! But hopefully I did answer your question.

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