使用 python 从私钥获取公钥 OpenSSL

Question

Well, I generate a private key with pyOpenSSL as follows:

from OpenSSL import crypto
k = crypto.PKey()
k.generate_key(crypto.TYPE_RSA, 2048)
print crypto.dump_privatekey(crypto.FILETYPE_PEM, k)

How do I get the public key string from it? I've still not found what method of this library does it. Thanks

Answer 1

If

cert = crypto.dump_certificate(crypto.FILETYPE_PEM, k)

doesn't do what you want, then it doesn't look like pyOpenSSL supports public key dumping. There is an unmerged branch here that adds that functionality but I can't claim that it does what is purports.

Answer 2

Updated: Now it has the method to get public key directly.

key = crypto.PKey()
key.generate_key(crypto.TYPE_RSA, 2048)
publickey_contents = crypto.dump_publickey(crypto.FILETYPE_PEM, key)

with the method dump_publickey you can get what you want.