linux-kernel - Re: [PATCH RESEND] random: initialize ChaCha20 constants with correct endianness

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Date:   Fri, 2 Apr 2021 20:03:56 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Theodore Ts'o <tytso@....edu>, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Jann Horn <jannh@...gle.com>, Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH RESEND] random: initialize ChaCha20 constants with
 correct endianness

On Sun, Mar 21, 2021 at 10:13:47PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> On big endian CPUs, the ChaCha20-based CRNG is using the wrong
> endianness for the ChaCha20 constants.
> 
> This doesn't matter cryptographically, but technically it means it's not
> ChaCha20 anymore.  Fix it to always use the standard constants.
> 
> Cc: linux-crypto@...r.kernel.org
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Jann Horn <jannh@...gle.com>
> Cc: Theodore Ts'o <tytso@....edu>
> Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
> Acked-by: Ard Biesheuvel <ardb@...nel.org>
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> ---
>  drivers/char/random.c   | 4 ++--
>  include/crypto/chacha.h | 9 +++++++--
>  2 files changed, 9 insertions(+), 4 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt