From: "Lasse Kärkkäinen" <ljkarkk2@cc.hut.fi>
To: linux-kernel@vger.kernel.org
Subject: urandom is too slow
Date: Tue, 30 Oct 2012 16:55:22 +0200 [thread overview]
Message-ID: <508FEA5A.7010406@cc.hut.fi> (raw)
Apparently there has been little or no development on urandom even
though the device is in widespread use for disk shredding and such use.
The device emits data at rather slow rate of 19 MB/s even on modern
hardware where other software-based PRNGs could do far better. An even
better option seems to be utilizing AES for encrypting zeroes, using a
random key, allowing for rates up to 500 MB/s with hardware that has
AES-NI instructions.
Why is urandom so slow and why isn't AES hardware acceleration utilized?
next reply other threads:[~2012-10-30 14:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-30 14:55 Lasse Kärkkäinen [this message]
2012-10-30 18:54 ` urandom is too slow Theodore Ts'o
2012-10-30 20:56 ` Pádraig Brady
2012-10-30 21:38 ` Alan Cox
2012-11-02 1:10 ` Lasse Kärkkäinen
2012-11-02 19:56 ` Theodore Ts'o
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