> On Mar 17, 2016, at 5:17 PM, Blumenthal, Uri - 0553 - MITLL <uri at ll.mit.edu> wrote: > > I?ve an extremely na?ve question. I am generating ephemeral EC keys for ECDH, following the example in https://wiki.openssl.org/index.php/EVP_Key_and_Parameter_Generation > > But it looks like the example ends on generation of the private key: > /* Generate the key */ > if (!EVP_PKEY_keygen(kctx, &key)) goto err; > > > The next step must be obvious, but somehow I can?t figure it out. So my question is: from having EVP_PKEY *privateECKey how do I get EVP_PKEY *publicECKey? The public key is always there. You either have both the public and private keys or just the public key. So the same EVP_PKEY object holds both. What you do next depends on what you want to do with the public key... -- Viktor.
