From patchwork Wed Jan 23 11:59:44 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lars Persson X-Patchwork-Id: 10777131 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 85A4F1399 for ; Wed, 23 Jan 2019 11:59:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 76F682B846 for ; Wed, 23 Jan 2019 11:59:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6BA432B898; Wed, 23 Jan 2019 11:59:58 +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 0DE242B846 for ; Wed, 23 Jan 2019 11:59:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725991AbfAWL75 (ORCPT ); Wed, 23 Jan 2019 06:59:57 -0500 Received: from bastet.se.axis.com ([195.60.68.11]:40657 "EHLO bastet.se.axis.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726168AbfAWL75 (ORCPT ); Wed, 23 Jan 2019 06:59:57 -0500 Received: from localhost (localhost [127.0.0.1]) by bastet.se.axis.com (Postfix) with ESMTP id BA9C71849C; Wed, 23 Jan 2019 12:59:54 +0100 (CET) X-Axis-User: NO X-Axis-NonUser: YES X-Virus-Scanned: Debian amavisd-new at bastet.se.axis.com X-Amavis-Alert: BAD HEADER SECTION, Duplicate header field: "References" Received: from bastet.se.axis.com ([IPv6:::ffff:127.0.0.1]) by localhost (bastet.se.axis.com [::ffff:127.0.0.1]) (amavisd-new, port 10024) with LMTP id e-KxI6pp37oY; Wed, 23 Jan 2019 12:59:53 +0100 (CET) Received: from boulder03.se.axis.com (boulder03.se.axis.com [10.0.8.17]) by bastet.se.axis.com (Postfix) with ESMTPS id 1FA951848F; Wed, 23 Jan 2019 12:59:53 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C23661E06A; Wed, 23 Jan 2019 12:59:52 +0100 (CET) Received: from boulder03.se.axis.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B67851E064; Wed, 23 Jan 2019 12:59:52 +0100 (CET) Received: from seth.se.axis.com (unknown [10.0.2.172]) by boulder03.se.axis.com (Postfix) with ESMTP; Wed, 23 Jan 2019 12:59:52 +0100 (CET) Received: from pc32929-1845.se.axis.com (pc32929-1845.se.axis.com [10.88.129.17]) by seth.se.axis.com (Postfix) with ESMTP id AADD41CA2; Wed, 23 Jan 2019 12:59:52 +0100 (CET) Received: by pc32929-1845.se.axis.com (Postfix, from userid 20456) id A8635409B9; Wed, 23 Jan 2019 12:59:52 +0100 (CET) From: Lars Persson To: linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au Cc: Lars Persson Subject: [PATCH 5/7] crypto: axis - support variable AEAD tag length Date: Wed, 23 Jan 2019 12:59:44 +0100 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: X-TM-AS-GCONF: 00 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 The implementation assumed that the client always wants the whole 16 byte AES-GCM tag. Now we respect the requested authentication tag size fetched using crypto_aead_authsize(). Signed-off-by: Lars Persson --- drivers/crypto/axis/artpec6_crypto.c | 35 +++++++++++++++++++++++++---------- 1 file changed, 25 insertions(+), 10 deletions(-) diff --git a/drivers/crypto/axis/artpec6_crypto.c b/drivers/crypto/axis/artpec6_crypto.c index 4936f8fb253a..1be5bdd658a4 100644 --- a/drivers/crypto/axis/artpec6_crypto.c +++ b/drivers/crypto/axis/artpec6_crypto.c @@ -1907,7 +1907,7 @@ static int artpec6_crypto_prepare_aead(struct aead_request *areq) /* For the decryption, cryptlen includes the tag. */ input_length = areq->cryptlen; if (req_ctx->decrypt) - input_length -= AES_BLOCK_SIZE; + input_length -= crypto_aead_authsize(cipher); /* Prepare the context buffer */ req_ctx->hw_ctx.aad_length_bits = @@ -1972,7 +1972,7 @@ static int artpec6_crypto_prepare_aead(struct aead_request *areq) size_t output_len = areq->cryptlen; if (req_ctx->decrypt) - output_len -= AES_BLOCK_SIZE; + output_len -= crypto_aead_authsize(cipher); artpec6_crypto_walk_init(&walk, areq->dst); @@ -2001,19 +2001,32 @@ static int artpec6_crypto_prepare_aead(struct aead_request *areq) * the output ciphertext. For decryption it is put in a context * buffer for later compare against the input tag. */ - count = AES_BLOCK_SIZE; if (req_ctx->decrypt) { ret = artpec6_crypto_setup_in_descr(common, - req_ctx->decryption_tag, count, false); + req_ctx->decryption_tag, AES_BLOCK_SIZE, false); if (ret) return ret; } else { + /* For encryption the requested tag size may be smaller + * than the hardware's generated tag. + */ + size_t authsize = crypto_aead_authsize(cipher); + ret = artpec6_crypto_setup_sg_descrs_in(common, &walk, - count); + authsize); if (ret) return ret; + + if (authsize < AES_BLOCK_SIZE) { + count = AES_BLOCK_SIZE - authsize; + ret = artpec6_crypto_setup_in_descr(common, + ac->pad_buffer, + count, false); + if (ret) + return ret; + } } } @@ -2174,27 +2187,29 @@ static void artpec6_crypto_complete_aead(struct crypto_async_request *req) /* Verify GCM hashtag. */ struct aead_request *areq = container_of(req, struct aead_request, base); + struct crypto_aead *aead = crypto_aead_reqtfm(areq); struct artpec6_crypto_aead_req_ctx *req_ctx = aead_request_ctx(areq); if (req_ctx->decrypt) { u8 input_tag[AES_BLOCK_SIZE]; + unsigned int authsize = crypto_aead_authsize(aead); sg_pcopy_to_buffer(areq->src, sg_nents(areq->src), input_tag, - AES_BLOCK_SIZE, + authsize, areq->assoclen + areq->cryptlen - - AES_BLOCK_SIZE); + authsize); if (memcmp(req_ctx->decryption_tag, input_tag, - AES_BLOCK_SIZE)) { + authsize)) { pr_debug("***EBADMSG:\n"); print_hex_dump_debug("ref:", DUMP_PREFIX_ADDRESS, 32, 1, - input_tag, AES_BLOCK_SIZE, true); + input_tag, authsize, true); print_hex_dump_debug("out:", DUMP_PREFIX_ADDRESS, 32, 1, req_ctx->decryption_tag, - AES_BLOCK_SIZE, true); + authsize, true); result = -EBADMSG; }