Separating public and private keys from RSA keypair variable

Question

As the title says, I have some code that generates a pair of RSA keys. I want to split them apart and use them individually to encrypt/decrypt, rather than use the variable

Answer 1

You can extract the RSA public key from RSA keypair using d2i_RSAPublicKey and i2d_RSAPublicKey (link). Use i2d_RSAPublicKey to encode your keypair to PKCS#1 RSAPublicKey stucture, store it in a bytestring, then use d2i_RSAPublicKey to decode it back to RSA key struct.