From patchwork Wed May 29 22:48:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Weinberger X-Patchwork-Id: 10967915 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 88BFD76 for ; Wed, 29 May 2019 22:55:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 799C628662 for ; Wed, 29 May 2019 22:55:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6AC952871A; Wed, 29 May 2019 22:55:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0AB6628662 for ; Wed, 29 May 2019 22:55:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726408AbfE2Wzi (ORCPT ); Wed, 29 May 2019 18:55:38 -0400 Received: from lilium.sigma-star.at ([109.75.188.150]:56270 "EHLO lilium.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726189AbfE2Wzi (ORCPT ); Wed, 29 May 2019 18:55:38 -0400 X-Greylist: delayed 386 seconds by postgrey-1.27 at vger.kernel.org; Wed, 29 May 2019 18:55:37 EDT Received: from localhost (localhost [127.0.0.1]) by lilium.sigma-star.at (Postfix) with ESMTP id A75C71809AD8C; Thu, 30 May 2019 00:49:08 +0200 (CEST) From: Richard Weinberger To: linux-crypto@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-imx@nxp.com, festevam@gmail.com, kernel@pengutronix.de, s.hauer@pengutronix.de, shawnguo@kernel.org, davem@davemloft.net, herbert@gondor.apana.org.au, david@sigma-star.at, Richard Weinberger Subject: [RFC PATCH 1/2] crypto: Allow working with key references Date: Thu, 30 May 2019 00:48:43 +0200 Message-Id: <20190529224844.25203-1-richard@nod.at> X-Mailer: git-send-email 2.16.4 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some crypto accelerators allow working with secure or hidden keys. This keys are not exposed to Linux nor main memory. To use them for a crypto operation they are referenced with a device specific id. This patch adds a new flag, CRYPTO_TFM_REQ_REF_KEY. If this flag is set, crypto drivers should tread the key as specified via setkey as reference and not as regular key. Since we reuse the key data structure such a reference is limited by the key size of the chiper and is chip specific. TODO: If the cipher implementation or the driver does not support reference keys, we need a way to detect this an fail upon setkey. How should the driver indicate that it supports this feature? Signed-off-by: Richard Weinberger --- include/linux/crypto.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/crypto.h b/include/linux/crypto.h index f2565a103158..737ea00e026b 100644 --- a/include/linux/crypto.h +++ b/include/linux/crypto.h @@ -121,6 +121,7 @@ #define CRYPTO_TFM_REQ_FORBID_WEAK_KEYS 0x00000100 #define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200 #define CRYPTO_TFM_REQ_MAY_BACKLOG 0x00000400 +#define CRYPTO_TFM_REQ_REF_KEY 0x00000800 #define CRYPTO_TFM_RES_WEAK_KEY 0x00100000 #define CRYPTO_TFM_RES_BAD_KEY_LEN 0x00200000 #define CRYPTO_TFM_RES_BAD_KEY_SCHED 0x00400000