[openssl-users] Naive: how to generate EC public key from EC private key?
noloader at gmail.com
Mon Mar 21 02:37:27 UTC 2016
> 2. For some reason the following code does not work - subsequent requests
> that involve pub key fail:
> dup_ekey = EVP_PKEY_get1_EC_KEY(pubkey);
> group = (EC_GROUP*) EC_KEY_get0_group(dup_ekey);
> nid = EC_GROUP_get_curve_name(group);
> printf("wrap: Deriving ECC keys over curve \"%s\"\n",
> But if I move the two XXX_free() calls to the end of the function -
> everything is fine. So in my working version of the code these lines are
> just before the return, after everything has been done. But I don’t
> understand why it behaves that way, given the man pages here:
get0 means the reference count was _not_ bumped, so the object should
not be free'd.
get1 means the reference count was incremented, and it needs an
accompanying free on the object.
I think the call to `EC_GROUP_free(group)` is superfluous and causing
memory corruption/double free.
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