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Date: Mon, 18 Sep 2017 10:49:56 +0200
From: Stephan Mueller <>
To: "Jason A. Donenfeld" <>
Cc:,,,,,, Herbert Xu <>, Kirill Marinushkin <>, Ard Biesheuvel <>, Ilhan Gurel <>,,
Subject: Re: [PATCH v4] security/keys: rewrite all of big_key crypto

Am Samstag, 16. September 2017, 15:00:34 CEST schrieb Jason A. Donenfeld:

Hi Jason,

> This started out as just replacing the use of crypto/rng with
> get_random_bytes_wait, 

This change is a challenge. The use of the kernel crypto API's DRNG has been 
made to allow FIPS 140-2 compliance. Otherwise, the entire key generation 
logic will not be using the right(TM) DRNG. Thus, I would not suggest to 
replace that for a stable tree.

Note, I am currently working on a pluggable DRNG apporach for /dev/random and 
/dev/urandom to be able to get rid of the use of the kernel crypto API's DRNG 
API. It is ready and I will air that solution shortly. Yet, it needs work to 
be integrated upstream (and approval from Ted Tso).


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