linux-kernel - Re: [PATCH v1] crypto: caam

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Message-ID: <VI1PR0401MB25919FFF2B07150E1BD02AE298B10@VI1PR0401MB2591.eurprd04.prod.outlook.com>
Date:   Thu, 3 Aug 2017 07:48:51 +0000
From:   Horia Geantă <horia.geanta@....com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     Harald Freudenberger <freude@...ux.vnet.ibm.com>,
        Oleksij Rempel <ore@...gutronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        "Dan Douglass" <dan.douglass@....com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v1] crypto: caam - set hwrng quality level

On 8/3/2017 6:17 AM, Herbert Xu wrote:
> On Wed, Aug 02, 2017 at 02:03:14PM +0000, Horia Geantă wrote:
>>
>> Take CAAM's engine HWRNG: it can work both as a TRNG and as a
>> TRNG-seeded DRBG (that's how it's currently configured).
>> IIUC, both setups are fit as source for the entropy pool.
> 
> So which is it? If it's a DRBG then it should not be exposed through
> the hwrng interface.  Only TRNG should go through hwrng.  DRBGs
> can use the crypto rng API.

Right now it's configured as a DRBG.
If I read correctly, it doesn't matter it's using the internal TRNG for
(automated) seeding, it still shouldn't use hwrng.
This means it's broken since the very beginning:
e24f7c9e87d4 crypto: caam - hwrng support

Thanks,
Horia