OpenSSL-3.+ how to configure [random]?

Matthew Tanner matthew at
Thu Nov 11 21:57:07 UTC 2021


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From: openssl-users <openssl-users-bounces at> on behalf of Dr Paul Dale <pauli at>
Sent: Wednesday, November 10, 2021 2:20:03 PM
To: openssl-users at <openssl-users at>
Subject: Re: OpenSSL-3.+ how to configure [random]?

I'm pretty sure the underlying problem is that there is a call to
RAND_set_rand_method() or RAND_set_rand_engine() occurring (likely the

These completely replace the built in RNG infrastructure with the
RAND_METHOD/engine.  If the engine then fails to produce output for any
reason, the observed results will present.

Adding the RDRAND engine again replaces the RAND_METHOD and things begin

I've no idea why the PKCS#11 engine has stopped working with 3.0. It
wasn't meant to.


On 11/11/21 1:36 am, Blumenthal, Uri - 0553 - MITLL wrote:
> Yes, it's related to, and yes - the same solution worked.
> There's something wrong with how PKCS#11 engine deals with (or presents itself as) rand provider.
> In any case, removing PKCS#11 engine from the [engines] section alleviated this problem.
> Thanks!
> P.S. I configured rand seed sources the standard way: "--with-rand-seed=rdcpu,os", as I think everybody does.

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