I need to extract the RSA public key from a RSA private key using OpenSSL.
I'm currently using RSAPublicKey_dup()
passing the RSA*
private key to get the public key. However, while the call seems to work, I cannot load (or use) this public key using the openssl command-line tool.
If I generate the public key using the command-line tool (" $ openssl rsa -in private.pem -pubout > public.pem
"), I can use it and it works like a charm.
Do you guys know how I can get this work ? Maybe another function ? The OpenSSL documentation is quite hard to browse...
Thank you.
I managed to make this work using PEM_write_bio_RSA_PUBKEY()
to write the PEM data to a in-memory buffer, then using PEM_read_bio_RSA_PUBKEY()
to get a new RSA*
.
Now the generated public key can be used ;)
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