linux-kernel - Re: [PATCH 1/4] lib/crypto: Add ML-DSA verification support

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Message-ID: <aSDnvNGos9qM2Uj5@wunner.de>
Date: Fri, 21 Nov 2025 23:29:16 +0100
From: Lukas Wunner <lukas@...ner.de>
To: Eric Biggers <ebiggers@...nel.org>
Cc: David Howells <dhowells@...hat.com>, linux-crypto@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Petr Pavlu <petr.pavlu@...e.com>,
	Daniel Gomez <da.gomez@...nel.org>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	"Jason A . Donenfeld" <Jason@...c4.com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Stephan Mueller <smueller@...onox.de>,
	Ignat Korchagin <ignat@...udflare.com>, keyrings@...r.kernel.org,
	linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] lib/crypto: Add ML-DSA verification support

On Fri, Nov 21, 2025 at 10:23:09PM +0000, Eric Biggers wrote:
> That list actually includes the same three files that use -EKEYREJECTED.
> It looks like if the signature verification fails "early" it's -EBADMSG,
> whereas if it fails "late" it's -EKEYREJECTED?

-EBADMSG denotes malformed data (e.g. incorrectly formatted ASN.1 payload).

-EKEYREJECTED denotes a well-formed, but incorrect signature (e.g. made
by a wrong key).

I think it's important and useful to be able to differentiate that.

Thanks,

Lukas