From nobody Tue Jan 27 00:12:57 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8B88F33E35C for ; Mon, 26 Jan 2026 14:29:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769437798; cv=none; b=raA2yYV0/eWnkQqqpAATvM++v2hEGfM6FFiay4RmxPaDuippvfTSsjrJJen9Yl2+GWbVKKk01U7yyt+ZsbhtsnX8nJnD0At6o/hqE7uu8TZxzxiAoDo+fJayKlYwKqZmsXX7fYBE6y1HzcneI1L5OzSYzBjvABBfN0Wj1d21C4w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769437798; c=relaxed/simple; bh=yxuz1XGwka25nwbP3TQtMQjnCd1A9XYnkw4fpQ+1zI4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OfBRrY+vZHWE9I/NEtDl77k6PyuW5lHOhB5aFgIImLKsomYD+jTMUF9algEH6sypGMh/O9cdDfqpyTlVdRwiiQdbNhk+BMQ0Xkgb7Bn/2v1e7WTyo2UnlAWSwg4GxlRjGjxTDhrt41e1B1B9CAmBfH0YgWSsHBuB3iHxqkmrB0c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=aMhSJ/AN; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="aMhSJ/AN" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769437794; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PrapPTZIg/B6PDqm9XjQ/SresbhuKzegBZp9ZIwUVT0=; b=aMhSJ/AN5ZcuwOEzaE0HFj9saBiSR28LxlBKd7KtlEpYAs7gwSDVrsl3Zw7aaUJd1eg0CI 0qiz+h184FNt3GZTEuUcRFbrQVnwML3523tGYJilSaSPd2HCrz/DCJnWwmhpKOaQS5UG9I dm2ZpUnukjiNuXl1KoqYKsXdtHWg4WE= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-50-wjpE7r4MOwufjKWD_dXKdg-1; Mon, 26 Jan 2026 09:29:51 -0500 X-MC-Unique: wjpE7r4MOwufjKWD_dXKdg-1 X-Mimecast-MFC-AGG-ID: wjpE7r4MOwufjKWD_dXKdg_1769437789 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 93479180034D; Mon, 26 Jan 2026 14:29:48 +0000 (UTC) Received: from warthog.procyon.org.uk.com (unknown [10.44.33.164]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 8F9171800993; Mon, 26 Jan 2026 14:29:43 +0000 (UTC) From: David Howells To: Lukas Wunner , Ignat Korchagin Cc: David Howells , Jarkko Sakkinen , Herbert Xu , Eric Biggers , Luis Chamberlain , Petr Pavlu , Daniel Gomez , Sami Tolvanen , "Jason A . Donenfeld" , Ard Biesheuvel , Stephan Mueller , linux-crypto@vger.kernel.org, keyrings@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v15 1/7] crypto: Add ML-DSA crypto_sig support Date: Mon, 26 Jan 2026 14:29:22 +0000 Message-ID: <20260126142931.1940586-2-dhowells@redhat.com> In-Reply-To: <20260126142931.1940586-1-dhowells@redhat.com> References: <20260126142931.1940586-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Content-Type: text/plain; charset="utf-8" Add verify-only public key crypto support for ML-DSA so that the X.509/PKCS#7 signature verification code, as used by module signing, amongst other things, can make use of it through the common crypto_sig API. Signed-off-by: David Howells Reviewed-by: Jarkko Sakkinen cc: Eric Biggers cc: Lukas Wunner cc: Ignat Korchagin cc: Stephan Mueller cc: Herbert Xu cc: keyrings@vger.kernel.org cc: linux-crypto@vger.kernel.org --- crypto/Kconfig | 9 +++ crypto/Makefile | 2 + crypto/mldsa.c | 201 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 212 insertions(+) create mode 100644 crypto/mldsa.c diff --git a/crypto/Kconfig b/crypto/Kconfig index 12a87f7cf150..a210575fa5e0 100644 --- a/crypto/Kconfig +++ b/crypto/Kconfig @@ -344,6 +344,15 @@ config CRYPTO_ECRDSA One of the Russian cryptographic standard algorithms (called GOST algorithms). Only signature verification is implemented. =20 +config CRYPTO_MLDSA + tristate "ML-DSA (Module-Lattice-Based Digital Signature Algorithm)" + select CRYPTO_SIG + select CRYPTO_LIB_MLDSA + help + ML-DSA (Module-Lattice-Based Digital Signature Algorithm) (FIPS-204). + + Only signature verification is implemented. + endmenu =20 menu "Block ciphers" diff --git a/crypto/Makefile b/crypto/Makefile index 23d3db7be425..267d5403045b 100644 --- a/crypto/Makefile +++ b/crypto/Makefile @@ -60,6 +60,8 @@ ecdsa_generic-y +=3D ecdsa-p1363.o ecdsa_generic-y +=3D ecdsasignature.asn1.o obj-$(CONFIG_CRYPTO_ECDSA) +=3D ecdsa_generic.o =20 +obj-$(CONFIG_CRYPTO_MLDSA) +=3D mldsa.o + crypto_acompress-y :=3D acompress.o crypto_acompress-y +=3D scompress.o obj-$(CONFIG_CRYPTO_ACOMP2) +=3D crypto_acompress.o diff --git a/crypto/mldsa.c b/crypto/mldsa.c new file mode 100644 index 000000000000..d8de082cc67a --- /dev/null +++ b/crypto/mldsa.c @@ -0,0 +1,201 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * crypto_sig wrapper around ML-DSA library. + */ +#include +#include +#include +#include + +struct crypto_mldsa_ctx { + u8 pk[MAX(MAX(MLDSA44_PUBLIC_KEY_SIZE, + MLDSA65_PUBLIC_KEY_SIZE), + MLDSA87_PUBLIC_KEY_SIZE)]; + unsigned int pk_len; + enum mldsa_alg strength; + bool key_set; +}; + +static int crypto_mldsa_sign(struct crypto_sig *tfm, + const void *msg, unsigned int msg_len, + void *sig, unsigned int sig_len) +{ + return -EOPNOTSUPP; +} + +static int crypto_mldsa_verify(struct crypto_sig *tfm, + const void *sig, unsigned int sig_len, + const void *msg, unsigned int msg_len) +{ + const struct crypto_mldsa_ctx *ctx =3D crypto_sig_ctx(tfm); + + if (unlikely(!ctx->key_set)) + return -EINVAL; + + return mldsa_verify(ctx->strength, sig, sig_len, msg, msg_len, + ctx->pk, ctx->pk_len); +} + +static unsigned int crypto_mldsa_key_size(struct crypto_sig *tfm) +{ + struct crypto_mldsa_ctx *ctx =3D crypto_sig_ctx(tfm); + + switch (ctx->strength) { + case MLDSA44: + return MLDSA44_PUBLIC_KEY_SIZE; + case MLDSA65: + return MLDSA65_PUBLIC_KEY_SIZE; + case MLDSA87: + return MLDSA87_PUBLIC_KEY_SIZE; + default: + WARN_ON_ONCE(1); + return 0; + } +} + +static int crypto_mldsa_set_pub_key(struct crypto_sig *tfm, + const void *key, unsigned int keylen) +{ + struct crypto_mldsa_ctx *ctx =3D crypto_sig_ctx(tfm); + unsigned int expected_len =3D crypto_mldsa_key_size(tfm); + + if (keylen !=3D expected_len) + return -EINVAL; + + ctx->pk_len =3D keylen; + memcpy(ctx->pk, key, keylen); + ctx->key_set =3D true; + return 0; +} + +static int crypto_mldsa_set_priv_key(struct crypto_sig *tfm, + const void *key, unsigned int keylen) +{ + return -EOPNOTSUPP; +} + +static unsigned int crypto_mldsa_max_size(struct crypto_sig *tfm) +{ + struct crypto_mldsa_ctx *ctx =3D crypto_sig_ctx(tfm); + + switch (ctx->strength) { + case MLDSA44: + return MLDSA44_SIGNATURE_SIZE; + case MLDSA65: + return MLDSA65_SIGNATURE_SIZE; + case MLDSA87: + return MLDSA87_SIGNATURE_SIZE; + default: + WARN_ON_ONCE(1); + return 0; + } +} + +static int crypto_mldsa44_alg_init(struct crypto_sig *tfm) +{ + struct crypto_mldsa_ctx *ctx =3D crypto_sig_ctx(tfm); + + ctx->strength =3D MLDSA44; + ctx->key_set =3D false; + return 0; +} + +static int crypto_mldsa65_alg_init(struct crypto_sig *tfm) +{ + struct crypto_mldsa_ctx *ctx =3D crypto_sig_ctx(tfm); + + ctx->strength =3D MLDSA65; + ctx->key_set =3D false; + return 0; +} + +static int crypto_mldsa87_alg_init(struct crypto_sig *tfm) +{ + struct crypto_mldsa_ctx *ctx =3D crypto_sig_ctx(tfm); + + ctx->strength =3D MLDSA87; + ctx->key_set =3D false; + return 0; +} + +static void crypto_mldsa_alg_exit(struct crypto_sig *tfm) +{ +} + +static struct sig_alg crypto_mldsa_algs[] =3D { + { + .sign =3D crypto_mldsa_sign, + .verify =3D crypto_mldsa_verify, + .set_pub_key =3D crypto_mldsa_set_pub_key, + .set_priv_key =3D crypto_mldsa_set_priv_key, + .key_size =3D crypto_mldsa_key_size, + .max_size =3D crypto_mldsa_max_size, + .init =3D crypto_mldsa44_alg_init, + .exit =3D crypto_mldsa_alg_exit, + .base.cra_name =3D "mldsa44", + .base.cra_driver_name =3D "mldsa44-lib", + .base.cra_ctxsize =3D sizeof(struct crypto_mldsa_ctx), + .base.cra_module =3D THIS_MODULE, + .base.cra_priority =3D 5000, + }, { + .sign =3D crypto_mldsa_sign, + .verify =3D crypto_mldsa_verify, + .set_pub_key =3D crypto_mldsa_set_pub_key, + .set_priv_key =3D crypto_mldsa_set_priv_key, + .key_size =3D crypto_mldsa_key_size, + .max_size =3D crypto_mldsa_max_size, + .init =3D crypto_mldsa65_alg_init, + .exit =3D crypto_mldsa_alg_exit, + .base.cra_name =3D "mldsa65", + .base.cra_driver_name =3D "mldsa65-lib", + .base.cra_ctxsize =3D sizeof(struct crypto_mldsa_ctx), + .base.cra_module =3D THIS_MODULE, + .base.cra_priority =3D 5000, + }, { + .sign =3D crypto_mldsa_sign, + .verify =3D crypto_mldsa_verify, + .set_pub_key =3D crypto_mldsa_set_pub_key, + .set_priv_key =3D crypto_mldsa_set_priv_key, + .key_size =3D crypto_mldsa_key_size, + .max_size =3D crypto_mldsa_max_size, + .init =3D crypto_mldsa87_alg_init, + .exit =3D crypto_mldsa_alg_exit, + .base.cra_name =3D "mldsa87", + .base.cra_driver_name =3D "mldsa87-lib", + .base.cra_ctxsize =3D sizeof(struct crypto_mldsa_ctx), + .base.cra_module =3D THIS_MODULE, + .base.cra_priority =3D 5000, + }, +}; + +static int __init mldsa_init(void) +{ + int ret, i; + + for (i =3D 0; i < ARRAY_SIZE(crypto_mldsa_algs); i++) { + ret =3D crypto_register_sig(&crypto_mldsa_algs[i]); + if (ret < 0) + goto error; + } + return 0; + +error: + pr_err("Failed to register (%d)\n", ret); + for (i--; i >=3D 0; i--) + crypto_unregister_sig(&crypto_mldsa_algs[i]); + return ret; +} +module_init(mldsa_init); + +static void mldsa_exit(void) +{ + for (int i =3D 0; i < ARRAY_SIZE(crypto_mldsa_algs); i++) + crypto_unregister_sig(&crypto_mldsa_algs[i]); +} +module_exit(mldsa_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Crypto API support for ML-DSA signature verification"); +MODULE_ALIAS_CRYPTO("mldsa44"); +MODULE_ALIAS_CRYPTO("mldsa65"); +MODULE_ALIAS_CRYPTO("mldsa87");