Python Openssl生成rsa密钥对并写入文件

Question

I want to generate a private , public key pair and put them into private.key and public.key files respectively. I have the following code.

from OpenSSL import crypto, SSL

def gen_rsa_key_pair():
    k = crypto.PKey()
    k.generate_key(crypto.TYPE_RSA, 1024)
    open("Priv.key", "wt").write(crypto.dump_privatekey(crypto.FILETYPE_PEM, k))

crypto.dump_publickey() is not available.

How do I dump public key to a file?

Answer 1

The OpenSSL functions to print the public RSA key do not seem to be exported by the Python OpenSSL wrapper. By accessing the internals of the crypto module, you could still do it yourself (assuming that you have this package installed locally), as this code snippet shows:

>>> bio = crypto._new_mem_buf()
>>> rsa = crypto._lib.EVP_PKEY_get1_RSA(k._pkey)
>>> crypto._lib.PEM_write_bio_RSAPublicKey(bio, rsa)
1
>>> s = crypto._bio_to_string(bio)
>>> print(s)
-----BEGIN RSA PUBLIC KEY-----
MIGJAoGBANF1gYh10F8HTQdM6+bkwAwJ0Md6bMciKbP3qS6KTki3v3m+cM17Szqq
Mp4xxWbvnS2oeotYfn8eaZg0QUTOVDd1F7tuOxVEdvQ9ZEp1aeOCRU3b9QZSmVfg
wJrqDG3f149mNdexI12plwaxyt6odonv6+fEQJrbhrV/nIA8N/EFAgMBAAE=
-----END RSA PUBLIC KEY-----

This is just for illustration purposes. A proper solution should be added to the crypto module itself, via a new method dump_publickey() or the like.