[openssl-users] RDRAND and engine (was: how to generate EC public key from EC private key)
noloader at gmail.com
Wed Mar 23 00:11:07 UTC 2016
On Tue, Mar 22, 2016 at 6:54 PM, Jeffrey Walton <noloader at gmail.com> wrote:
>> 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?
> To verify it, I think you need to inspect the default RAND method. Its
> going to look something like:
> RAND_METHOD* rm = RAND_get_rand_method();
> if(rm == RAND_SSLeay())
> printf("Using default generator\n");
> Also see https://wiki.openssl.org/index.php/Random_Numbers#Generators.
> RDRAND is discussed there, too. But I don't recall how much detail is
Ah, its right there. I should have checked earlier
To ensure RAND_bytes uses the [RDRAND] hardware engine, you must
perform three steps:
* load the rdrand engine
* acquire a handle to the engine
* set the default RAND_method to the engine
It also provides the sample code.
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