linux-kernel - Re: [PATCH 3/3] hwrng: msm

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Message-ID: <015f1c8d-553c-3d54-c7c6-34bbb4fcd1a0@linaro.org>
Date:   Fri, 22 Jun 2018 18:33:40 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Vinod Koul <vinod.koul@...aro.org>, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, Matt Mackall <mpm@...enic.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, Vinod Koul <vkoul@...nel.org>
Subject: Re: [PATCH 3/3] hwrng: msm - Add support for prng v2

Hi,

On 06/22/2018 05:38 PM, Herbert Xu wrote:
> On Fri, Jun 22, 2018 at 11:27:59AM +0300, Stanimir Varbanov wrote:
>> Hi Herbert,
>>
>> On 06/21/2018 02:53 PM, Herbert Xu wrote:
>>> On Thu, Jun 21, 2018 at 02:27:10PM +0300, Stanimir Varbanov wrote:
>>>>
>>>> OK, I just wanted to say that it is _not_ PRNG and the register names
>>>> gives us wrong impression.
>>>
>>> So does it generate one bit of output for each bit of hardware-
>>> generated entropy like /dev/random? Or does it use a hardware-
>>> generated seed to power a PRNG?
>>
>> I believe it is the second one. Isn't the second one SP 800-90A?
> 
> In that case it should switch over to algif_rng.

OK, what about the rest drivers in drivers/char/hw_random? Are they all
true RNG?

-- 
regards,
Stan