linux-kernel - Re: [PATCH] crypto: caam: set hwrng quality level

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Message-ID: <VI1PR0402MB34850724B851235EE1FCE2D0987C0@VI1PR0402MB3485.eurprd04.prod.outlook.com>
Date:   Tue, 19 Feb 2019 06:57:10 +0000
From:   Horia Geanta <horia.geanta@....com>
To:     Philipp Puschmann <philipp.puschmann@...ix.com>
CC:     Aymen Sghaier <aymen.sghaier@....com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "o.rempel@...gutronix.de" <o.rempel@...gutronix.de>
Subject: Re: [PATCH] crypto: caam: set hwrng quality level

On 2/13/2019 4:49 PM, Philipp Puschmann wrote:
> When quality is set to 0 this driver is not used as randomness source by
> HWRNG framework at all. So set the quality and finally make this driver
> work. The value of the quality was discussed before
> ( see see https://patchwork.kernel.org/patch/9850669/ ) and it is still a rough
> value.
> 
In the same thread you mention, the conclusion is that caamrng should be
properly configured (TRNG instead of DRBG) before claiming to be a reliable
hwrng entropy source.

Horia