From patchwork Wed Dec 1 00:48:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolai Stange X-Patchwork-Id: 519428 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8A57EC43219 for ; Wed, 1 Dec 2021 00:50:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346042AbhLAAxd (ORCPT ); Tue, 30 Nov 2021 19:53:33 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:58140 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345914AbhLAAww (ORCPT ); Tue, 30 Nov 2021 19:52:52 -0500 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 1F2C61FD5D; Wed, 1 Dec 2021 00:49:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1638319771; h=from:from:reply-to: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=srA8bsnlFmW4wisDufAdp5C+fl/L05W6nTkDzGSivQg=; b=dNyWg8juMIHnfiGl7jiV/FCTuNIDy1L4jkq0J4teM6BJF5ZzLe99vxwmYIm3TdSFyTkQ7u Hs2XZIcWACjfjTNE650ST36p9eHjUZ6vV1214wkWXcrEnxnnSbPxHi/wtx2Uz6IfP5jsfc f21RXyyiyX9v2FpkYju5MLf6AW2N/rg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1638319771; h=from:from:reply-to: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=srA8bsnlFmW4wisDufAdp5C+fl/L05W6nTkDzGSivQg=; b=dXvL5Jjn3oOWosrbYftrIJmwhx+t16+tsN7mixn287nPXJ/oCAB5kpiDnhUtWm6PpZzmeZ LYojkTuNK7YagzBg== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 09E1313C10; Wed, 1 Dec 2021 00:49:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id Ph3mAJvGpmH4KAAAMHmgww (envelope-from ); Wed, 01 Dec 2021 00:49:31 +0000 From: Nicolai Stange To: Herbert Xu , "David S. Miller" Cc: =?utf-8?q?Stephan_M=C3=BCller?= , Hannes Reinecke , Torsten Duwe , Zaibo Xu , Giovanni Cabiddu , David Howells , Jarkko Sakkinen , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, qat-linux@intel.com, keyrings@vger.kernel.org, Nicolai Stange Subject: [PATCH 10/18] crypto: dh - introduce support for ephemeral key generation to dh-generic Date: Wed, 1 Dec 2021 01:48:50 +0100 Message-Id: <20211201004858.19831-11-nstange@suse.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20211201004858.19831-1-nstange@suse.de> References: <20211201004858.19831-1-nstange@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The support for NVME in-band authentication currently in the works ([1]) needs to generate ephemeral DH keys. Make dh-generic's ->set_secret() to generate an ephemeral key via the recently added crypto_dh_gen_privkey() in case the input ->key_size is zero. Note that this behaviour is in analogy to ecdh's ->set_secret(). [1] https://lkml.kernel.org/r/20211122074727.25988-4-hare@suse.de Signed-off-by: Nicolai Stange Reviewed-by: Hannes Reinecke --- crypto/dh.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/crypto/dh.c b/crypto/dh.c index 131b80064cb1..2e49b114e038 100644 --- a/crypto/dh.c +++ b/crypto/dh.c @@ -71,25 +71,41 @@ static int dh_set_secret(struct crypto_kpp *tfm, const void *buf, { struct dh_ctx *ctx = dh_get_ctx(tfm); struct dh params; + char key[CRYPTO_DH_MAX_PRIVKEY_SIZE]; + int err; /* Free the old MPI key if any */ dh_clear_ctx(ctx); - if (crypto_dh_decode_key(buf, len, ¶ms) < 0) + err = crypto_dh_decode_key(buf, len, ¶ms); + if (err) goto err_clear_ctx; - if (dh_set_params(ctx, ¶ms) < 0) + if (!params.key_size) { + err = crypto_dh_gen_privkey(params.group_id, key, + ¶ms.key_size); + if (err) + goto err_clear_ctx; + params.key = key; + } + + err = dh_set_params(ctx, ¶ms); + if (err) goto err_clear_ctx; ctx->xa = mpi_read_raw_data(params.key, params.key_size); - if (!ctx->xa) + if (!ctx->xa) { + err = -EINVAL; goto err_clear_ctx; + } + + memzero_explicit(key, sizeof(key)); return 0; err_clear_ctx: dh_clear_ctx(ctx); - return -EINVAL; + return err; } /*