From: Stephan Mueller <smueller@chronox.de>
To: "Łukasz Stelmach" <l.stelmach@samsung.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>,
robh+dt@kernel.org, Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
Kukjin Kim <kgene@kernel.org>,
linux-crypto@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
linux-kernel@vger.kernel.org, m.szyprowski@samsung.com,
b.zolnierkie@samsung.com
Subject: Re: [PATCH 3/3] crypto: exynos - Reseed PRNG after generating 2^16 random bytes
Date: Tue, 05 Dec 2017 14:52:31 +0100 [thread overview]
Message-ID: <6915204.SlqusmoAzB@tauon.chronox.de> (raw)
In-Reply-To: <20171205123558.31087-4-l.stelmach@samsung.com>
Am Dienstag, 5. Dezember 2017, 13:35:58 CET schrieb Łukasz Stelmach:
Hi Łukasz,
> Reseed PRNG after reading 65 kB of randomness. Although this may reduce
> performance, in most casese the loss is not noticable.
Please add to the log that you also increase the timer-based reseed to 1
second?!
Another suggestion: maybe you want to add a comment to the reseed function to
indicate it is for enhanced backtracking resistance. Otherwise a lot of folks
would scratch their head why such code exists in the first place. :-)
Other than that:
Reviewed-by: Stephan Mueller <smueller@chronox.de>
Ciao
Stephan
next prev parent reply other threads:[~2017-12-05 13:52 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20171205123601eucas1p2ef1a2fdce84dce8dc4b54c419ce566a7@eucas1p2.samsung.com>
2017-12-05 12:35 ` [PATCH 0/3] Assorted changes for Exynos PRNG driver Łukasz Stelmach
[not found] ` <CGME20171205123602eucas1p2d3ee1e53adc35df7c52917d43bcdebfd@eucas1p2.samsung.com>
2017-12-05 12:35 ` [PATCH 1/3] crypto: exynos - Support Exynos5250+ SoCs Łukasz Stelmach
2017-12-05 13:34 ` Krzysztof Kozlowski
[not found] ` <CGME20171206134305eucas1p218c38b977c14cae58763586458c3e78d@eucas1p2.samsung.com>
2017-12-06 13:42 ` Łukasz Stelmach
2017-12-06 14:05 ` Krzysztof Kozlowski
[not found] ` <CGME20171206145312eucas1p226d52f60f15e45456aefd6270cc88e07@eucas1p2.samsung.com>
2017-12-06 14:53 ` Łukasz Stelmach
2017-12-06 15:28 ` Krzysztof Kozlowski
[not found] ` <CGME20171207092032eucas1p296f7cbc547d159c52561182cc6461504@eucas1p2.samsung.com>
2017-12-07 9:20 ` Łukasz Stelmach
2017-12-06 17:56 ` Joe Perches
[not found] ` <CGME20171205123603eucas1p177cceb022e3a5c0a9d13ca437c05b669@eucas1p1.samsung.com>
2017-12-05 12:35 ` [PATCH 2/3] crypto: exynos - Improve performance of PRNG Łukasz Stelmach
2017-12-05 13:49 ` Krzysztof Kozlowski
2017-12-05 13:54 ` Stephan Mueller
[not found] ` <CGME20171205164319eucas1p1e79b9798d655851762cc83a6737b73b4@eucas1p1.samsung.com>
2017-12-05 16:43 ` Łukasz Stelmach
2017-12-05 17:53 ` Krzysztof Kozlowski
2017-12-05 18:06 ` Krzysztof Kozlowski
[not found] ` <CGME20171206113301eucas1p23da9decc34cc646b0bf4eb88953ef94a@eucas1p2.samsung.com>
2017-12-06 11:32 ` Łukasz Stelmach
2017-12-06 11:37 ` Krzysztof Kozlowski
[not found] ` <CGME20171206130651eucas1p22b5d0799f2a128d3d9efcc799fc3cfdc@eucas1p2.samsung.com>
2017-12-06 13:06 ` Łukasz Stelmach
[not found] ` <CGME20171205123604eucas1p2a6a2738e3cf1f9c300e8d128362429ed@eucas1p2.samsung.com>
2017-12-05 12:35 ` [PATCH 3/3] crypto: exynos - Reseed PRNG after generating 2^16 random bytes Łukasz Stelmach
2017-12-05 13:52 ` Stephan Mueller [this message]
2017-12-05 13:55 ` Krzysztof Kozlowski
[not found] ` <CGME20171211140635eucas1p22ab5dac69623926c583779a6b93872ce@eucas1p2.samsung.com>
2017-12-11 14:06 ` [PATCH v2 0/4] Assorted changes for Exynos PRNG driver Łukasz Stelmach
[not found] ` <CGME20171212163609eucas1p2aaee0a21276b66f4cb492a4502f66756@eucas1p2.samsung.com>
2017-12-12 16:36 ` [PATCH v3 " Łukasz Stelmach
2017-12-22 9:09 ` Herbert Xu
2017-12-12 16:36 ` [PATCH v3 1/4] crypto: exynos - Support Exynos5250+ SoCs Łukasz Stelmach
2017-12-13 8:06 ` Krzysztof Kozlowski
2017-12-12 16:36 ` [PATCH v3 2/4] crypto: exynos - Improve performance of PRNG Łukasz Stelmach
2017-12-13 8:07 ` Krzysztof Kozlowski
2017-12-12 16:36 ` [PATCH v3 3/4] crypto: exynos - Reseed PRNG after generating 2^16 random bytes Łukasz Stelmach
2017-12-13 8:12 ` Krzysztof Kozlowski
2017-12-12 16:36 ` [PATCH v3 4/4] crypto: exynos - Introduce mutex to prevent concurrent access to hardware Łukasz Stelmach
2017-12-11 14:06 ` [PATCH v2 1/4] crypto: exynos - Support Exynos5250+ SoCs Łukasz Stelmach
2017-12-11 14:36 ` Krzysztof Kozlowski
2017-12-11 14:06 ` [PATCH v2 2/4] crypto: exynos - Improve performance of PRNG Łukasz Stelmach
2017-12-11 14:54 ` Krzysztof Kozlowski
[not found] ` <CGME20171212144953eucas1p2079156cb46dc72e2a73868ca2d88ba05@eucas1p2.samsung.com>
2017-12-12 14:49 ` Łukasz Stelmach
2017-12-11 14:06 ` [PATCH v2 3/4] crypto: exynos - Reseed PRNG after generating 2^16 random bytes Łukasz Stelmach
2017-12-11 14:57 ` Krzysztof Kozlowski
2017-12-11 14:06 ` [PATCH v2 4/4] crypto: exynos - Introduce mutex to prevent concurrent access to hardware Łukasz Stelmach
2017-12-11 15:03 ` Krzysztof Kozlowski
[not found] ` <CGME20171212103021eucas1p19a2a24930cadde55eac2f822a6a9f80c@eucas1p1.samsung.com>
2017-12-12 10:30 ` Łukasz Stelmach
2017-12-12 11:09 ` Krzysztof Kozlowski
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