Thank you - employing the pointers (no pun intended :) that you gave, the code now is doing exactly what’s needed, and utilizes RDRAND (as required by the specs I have, and my personal preferences as well).
> set the default RAND_method to the engine
This is what I did not do originally - fixed now.
P.S. I wonder if there’s a way for the application (that did NOT set the
environment by itself - think a function or a module called by somebody
else) can verify that, e.g., RAND_METHOD is what it wants (say, RDRAND in
my case), rather than what it is NOT (e.g., not RAND_SSLeay()).
--
Regards,
Uri Blumenthal
On 3/22/16, 20:11 , "openssl-users on behalf of Jeffrey Walton"
<openssl-users-boun...@openssl.org on behalf of noloa...@gmail.com> wrote:
>On Tue, Mar 22, 2016 at 6:54 PM, Jeffrey Walton <noloa...@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
>> provided.
>
>Ah, its right there. I should have checked earlier
>(http://wiki.openssl.org/index.php/Random_Numbers#Hardware):
>
>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.
>
>Jeff
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