From: krzk@kernel.org (Krzysztof Kozlowski)
To: linux-arm-kernel@lists.infradead.org
Subject: Question - seeding the hw pseudo random number generator
Date: Sat, 18 Mar 2017 11:25:54 +0200 [thread overview]
Message-ID: <20170318092554.lggkhfg5eko23o3k@kozik-lap> (raw)
Hi,
I looked at Exynos Pseudo Random Nubmer Generator driver
(drivers/char/hw_random/exynos-rng.c) and noticed that it always seeds
the device with jiffies. Then I looked at few other drivers and found
that they do not seed themself (or at least I couldn't find this).
I think the hw_random API does not provide generic infrastructure for
seeding.
What is the preferred approach for seeding a PRNG device? Use jiffies or
a fixed value?
Or maybe the interface should be abandoned in favor of crypto API?
Best regards,
Krzysztof
next reply other threads:[~2017-03-18 9:25 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-18 9:25 Krzysztof Kozlowski [this message]
2017-03-20 6:49 ` Question - seeding the hw pseudo random number generator PrasannaKumar Muralidharan
2017-03-20 13:28 ` Herbert Xu
2017-03-20 13:39 ` Stephan Müller
2017-03-23 8:03 ` Harald Freudenberger
2017-03-23 11:35 ` Stephan Müller
2017-03-20 18:24 ` Krzysztof Kozlowski
2017-03-23 8:23 ` Corentin Labbe
2017-03-23 9:44 ` Herbert Xu
2017-03-23 11:44 ` Stephan Müller
2017-03-23 13:06 ` Stephan Müller
2017-03-26 4:10 ` Stephan Müller
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