Great! Say, I want to extract the public key and make it available to another entity or module? Possibly DER-encoded, though I'd like to learn how to do both: extract ASN.1-encoded and raw (assuming it is possible).
Thanks! Sent from my BlackBerry 10 smartphone on the Verizon Wireless 4G LTE network. Original Message From: Viktor Dukhovni Sent: Thursday, March 17, 2016 17:57 To: openssl-users@openssl.org Reply To: openssl-users@openssl.org Subject: Re: [openssl-users] Naive: how to generate EC public key from EC private key? > On Mar 17, 2016, at 5:17 PM, Blumenthal, Uri - 0553 - MITLL <u...@ll.mit.edu> > wrote: > > I’ve an extremely naïve 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. -- openssl-users mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-users
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