Oh, and I'd much prefer to stay at the EVP level, rather than invoke BIO primitives for this task.
Sent from my BlackBerry 10 smartphone on the Verizon Wireless 4G LTE network. Original Message From: Blumenthal, Uri - 0553 - MITLL Sent: Thursday, March 17, 2016 18:09 To: Viktor Dukhovni; 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? 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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