linux-kernel - Re: IMA and PQC

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Message-ID: <aYH5AlnUIv9MPRiY@Rk>
Date: Tue, 3 Feb 2026 21:43:03 +0800
From: Coiby Xu <coxu@...hat.com>
To: David Howells <dhowells@...hat.com>
Cc: Mimi Zohar <zohar@...ux.ibm.com>, Simo Sorce <simo@...hat.com>, 
	Roberto Sassu <roberto.sassu@...wei.com>, Dmitry Kasatkin <dmitry.kasatkin@...il.com>, 
	Eric Snowberg <eric.snowberg@...cle.com>, Eric Biggers <ebiggers@...nel.org>, 
	linux-integrity@...r.kernel.org, linux-crypto@...r.kernel.org, keyrings@...r.kernel.org, 
	linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: IMA and PQC

On Fri, Jan 30, 2026 at 02:10:21PM +0000, David Howells wrote:
>Coiby Xu <coxu@...hat.com> wrote:
>
>> Take latest fresh CentOS Stream 10 x86_64 KVM guest as example, without any
>> file system optimization, extra ~189MB disk space is needed if all files in
>> /usr signed using by ML-DSA-65 where the disk size is 50G.
>
>Is that storing raw signatures rather than PKCS#7 wrapped signatures?

Yes, it's storing raw signatures + per ~20 bytes overhead including the
4-byte key ID.

>
>David
>

-- 
Best regards,
Coiby