linux-kernel - Re: [PATCH RFC] crypto/hkdf: Fix salt length short issue in FIPS mode

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Message-ID: <20251127011446.GA1548@sol>
Date: Wed, 26 Nov 2025 17:14:46 -0800
From: Eric Biggers <ebiggers@...nel.org>
To: Li Tian <litian@...hat.com>
Cc: linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fscrypt@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S . Miller" <davem@...emloft.net>,
	"Theodore Y . Ts'o" <tytso@....edu>,
	Jaegeuk Kim <jaegeuk@...nel.org>
Subject: Re: [PATCH RFC] crypto/hkdf: Fix salt length short issue in FIPS mode

On Thu, Nov 27, 2025 at 09:10:45AM +0800, Li Tian wrote:
> Eric,
> 
> Thanks for reviewing. Not just the salt_size=0 case, but several cases with
> salt < 32 from my tests.
> So simply skip those then?
> 
> BR,
> Li Tian

Why do you think the salt needs to be at least 32 bytes?

- Eric