[openssl-users] Naive: how to generate EC public key from EC private key?

Blumenthal, Uri - 0553 - MITLL uri at ll.mit.edu
Tue Mar 22 22:49:49 UTC 2016

One more hurdle passed. The code is working perfect, AFAIK.
Now one small question: how do I ensure that ‎RAND_engine (and therefore Intel RDRAND output) is being used for the key generation in
   EVP_PKEY_keygen(ctx, &newkey);

Is just loading RAND_engine enough for that?‎
Sent from my BlackBerry 10 smartphone on the Verizon Wireless 4G LTE network.
  Original Message  
From: Viktor Dukhovni‎
Sent: Sunday, March 20, 2016 22:39‎
To: openssl-users at openssl.org
Reply To: openssl-users at openssl.org
Subject: Re: [openssl-users] Naive: how to generate EC public key from EC	private key?

> On Mar 20, 2016, at 10:32 PM, Blumenthal, Uri - 0553 - MITLL <uri at ll.mit.edu> wrote:
> dup_ekey = EVP_PKEY_get1_EC_KEY(pubkey);
> group = (EC_GROUP*) EC_KEY_get0_group(dup_ekey);

Declare the group as:

const EC_GROUP *group;


group = EC_KEY_get0_group();

> nid = EC_GROUP_get_curve_name(group);
> printf("wrap: Deriving ECC keys over curve \"%s\"\n",
> EC_curve_nid2nist(nid));
This is fine.

> EC_GROUP_free(group);

This is very wrong. You're not supposed to free the group.
Note the "get0_group", you're not getting a copy...


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