From patchwork Thu Dec 29 21:17:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladis Dronov X-Patchwork-Id: 13083828 X-Patchwork-Delegate: herbert@gondor.apana.org.au 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 9318EC46467 for ; Thu, 29 Dec 2022 21:18:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234239AbiL2VS1 (ORCPT ); Thu, 29 Dec 2022 16:18:27 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234194AbiL2VSR (ORCPT ); Thu, 29 Dec 2022 16:18:17 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A63A9FF0 for ; Thu, 29 Dec 2022 13:17:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1672348648; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HInbXzTW3Cb08AWmdq+dd1m19tc/OaqTF+DjibQiGV4=; b=c2sw2V+yh25IOTyTIW9MGybcOjZ6vI6xo9Ixrv5XOc59ECfWIIr3ls8NnPTpEW4ZJ/iaNH fmlyUc2WakfVSyYciI5ziHbL9HWVhdipYcRW7S84jpDp602SO8YTx5386XLVjtXTc3FvHr aGasklOaVw850HonWrPyxAX7oMeFPaw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-84-b4_ZkEDMNJOK7ZlJvgxDyw-1; Thu, 29 Dec 2022 16:17:23 -0500 X-MC-Unique: b4_ZkEDMNJOK7ZlJvgxDyw-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 825CC8533DA; Thu, 29 Dec 2022 21:17:22 +0000 (UTC) Received: from rules.brq.redhat.com (ovpn-208-2.brq.redhat.com [10.40.208.2]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3E53C492B00; Thu, 29 Dec 2022 21:17:20 +0000 (UTC) From: Vladis Dronov To: Herbert Xu , "David S . Miller" Cc: Nicolai Stange , Elliott Robert , Stephan Mueller , Eric Biggers , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, Vladis Dronov Subject: [PATCH v3 1/6] crypto: xts - restrict key lengths to approved values in FIPS mode Date: Thu, 29 Dec 2022 22:17:05 +0100 Message-Id: <20221229211710.14912-2-vdronov@redhat.com> In-Reply-To: <20221229211710.14912-1-vdronov@redhat.com> References: <20221229211710.14912-1-vdronov@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Nicolai Stange According to FIPS 140-3 IG C.I., only (total) key lengths of either 256 bits or 512 bits are allowed with xts(aes). Make xts_verify_key() to reject anything else in FIPS mode. As xts(aes) is the only approved xts() template instantiation in FIPS mode, the new restriction implemented in xts_verify_key() effectively only applies to this particular construction. Signed-off-by: Nicolai Stange Signed-off-by: Vladis Dronov --- include/crypto/xts.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/crypto/xts.h b/include/crypto/xts.h index 0f8dba69feb4..a233c1054df2 100644 --- a/include/crypto/xts.h +++ b/include/crypto/xts.h @@ -35,6 +35,13 @@ static inline int xts_verify_key(struct crypto_skcipher *tfm, if (keylen % 2) return -EINVAL; + /* + * In FIPS mode only a combined key length of either 256 or + * 512 bits is allowed, c.f. FIPS 140-3 IG C.I. + */ + if (fips_enabled && keylen != 32 && keylen != 64) + return -EINVAL; + /* ensure that the AES and tweak key are not identical */ if ((fips_enabled || (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&