From patchwork Wed Jun 26 20:40:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 11018347 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 0D2221708 for ; Wed, 26 Jun 2019 20:41:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 009E12871C for ; Wed, 26 Jun 2019 20:41:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E7F99289B9; Wed, 26 Jun 2019 20:41:03 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable 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 9B4B7289BD for ; Wed, 26 Jun 2019 20:41:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726370AbfFZUlC (ORCPT ); Wed, 26 Jun 2019 16:41:02 -0400 Received: from mail-wr1-f66.google.com ([209.85.221.66]:46176 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726441AbfFZUlB (ORCPT ); Wed, 26 Jun 2019 16:41:01 -0400 Received: by mail-wr1-f66.google.com with SMTP id n4so4229817wrw.13 for ; Wed, 26 Jun 2019 13:40:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=20kar+4njHVQnk3Y1QM9bnnvyr2Y5wWcvH/MhU3+4M0=; b=gcjRn8/B7+5aQ7YY8vCzFyDndiyD+sJvN1BG7BVcIVeM2yB+q7MxyySMZJUh0F5jRQ deTbyo8sMVcb2nqJjeyCnYod1uPPzhmkp8DgjzrkbTfCZbVi43Z/YFd9oogs5cJt2d/O GIESa5XwQ1NhyUlmB+lyxFL5e610pWTr3ArdpDWG+pDkC07X4KswbDBiZGBFf0J1ztRu Jd9l17ozkQlkovDv5vg6mEFWhzvyu9R26RjhxTJpQhyPDzBKAvED5nI1E2vLcGBqShK0 VLauin1Tg5lSDWS6Jo4P2gwc4qCCd4GdJUnhwD5Ts1PfdY0MOH+snKf26MAwFR/u3MMu Mb1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=20kar+4njHVQnk3Y1QM9bnnvyr2Y5wWcvH/MhU3+4M0=; b=lBZAYo5jxR3goAWmv6y7bvvZYtaeNtBnlhYKV3kjQiblDS+qbMkNsZJK9uOOfZk5YR dRi4E1YRP2NT05kwclSQHOcHKr+dIJUF1xeGDibT+Dp0zOL1xwcR0jh2VMap0tcR58Ep V+k1gaJH6c89Pi30FHuhuZJiOT4D7cv4SvSb6GoaOR0/v9/JuNOrS15KYVtiR46DtGFw dBlUCszyX89exRtcErfSSBf6PDTeZWBIGWBAjY2ntoDcR4qHll2ybRq27k9CSZWF4jqI hNBheTp7IBR9W0AhhcYOwQTbYsj24GDQ/bENty3Kt4sFFbunF5OFwkJGfo60/4XhpjCE 1oAw== X-Gm-Message-State: APjAAAVOWqqSnkLcdWr9yfFVz969eYBhqBRA83Zjnp6esTyYUKuJtpcT 8Vg6Xr3NwVKdPwkHTz4K4WTVdg== X-Google-Smtp-Source: APXvYqyRIEdBtLVsF7V8V07NC67xLXPG+qJZC98XUjaja1QIzI8jmm/EGi9COcIZXwwNIh0OSSVOBA== X-Received: by 2002:a5d:5702:: with SMTP id a2mr5328790wrv.89.1561581658767; Wed, 26 Jun 2019 13:40:58 -0700 (PDT) Received: from sudo.home ([2a01:cb1d:112:6f00:9c7f:f574:ee94:7dec]) by smtp.gmail.com with ESMTPSA id 32sm35164587wra.35.2019.06.26.13.40.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Jun 2019 13:40:58 -0700 (PDT) From: Ard Biesheuvel To: linux-crypto@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Ard Biesheuvel , Herbert Xu , Eric Biggers , dm-devel@redhat.com, linux-fscrypt@vger.kernel.org, Gilad Ben-Yossef , Milan Broz Subject: [PATCH v5 6/7] crypto: arm64/aes-cts-cbc - factor out CBC en/decryption of a walk Date: Wed, 26 Jun 2019 22:40:46 +0200 Message-Id: <20190626204047.32131-7-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190626204047.32131-1-ard.biesheuvel@linaro.org> References: <20190626204047.32131-1-ard.biesheuvel@linaro.org> MIME-Version: 1.0 Sender: linux-fscrypt-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fscrypt@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The plain CBC driver and the CTS one share some code that iterates over a scatterwalk and invokes the CBC asm code to do the processing. The upcoming ESSIV/CBC mode will clone that pattern for the third time, so let's factor it out first. Signed-off-by: Ard Biesheuvel --- arch/arm64/crypto/aes-glue.c | 82 ++++++++++---------- 1 file changed, 40 insertions(+), 42 deletions(-) diff --git a/arch/arm64/crypto/aes-glue.c b/arch/arm64/crypto/aes-glue.c index f0ceb545bd1e..11b85ce02d7a 100644 --- a/arch/arm64/crypto/aes-glue.c +++ b/arch/arm64/crypto/aes-glue.c @@ -185,46 +185,64 @@ static int ecb_decrypt(struct skcipher_request *req) return err; } -static int cbc_encrypt(struct skcipher_request *req) +static int cbc_encrypt_walk(struct skcipher_request *req, + struct skcipher_walk *walk) { struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); - int err, rounds = 6 + ctx->key_length / 4; - struct skcipher_walk walk; + int err = 0, rounds = 6 + ctx->key_length / 4; unsigned int blocks; - err = skcipher_walk_virt(&walk, req, false); - - while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { + while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { kernel_neon_begin(); - aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr, - ctx->key_enc, rounds, blocks, walk.iv); + aes_cbc_encrypt(walk->dst.virt.addr, walk->src.virt.addr, + ctx->key_enc, rounds, blocks, walk->iv); kernel_neon_end(); - err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); + err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); } return err; } -static int cbc_decrypt(struct skcipher_request *req) +static int cbc_encrypt(struct skcipher_request *req) { - struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); - struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); - int err, rounds = 6 + ctx->key_length / 4; struct skcipher_walk walk; - unsigned int blocks; + int err; err = skcipher_walk_virt(&walk, req, false); + if (err) + return err; + return cbc_encrypt_walk(req, &walk); +} - while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { +static int cbc_decrypt_walk(struct skcipher_request *req, + struct skcipher_walk *walk) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm); + int err = 0, rounds = 6 + ctx->key_length / 4; + unsigned int blocks; + + while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) { kernel_neon_begin(); - aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, - ctx->key_dec, rounds, blocks, walk.iv); + aes_cbc_decrypt(walk->dst.virt.addr, walk->src.virt.addr, + ctx->key_dec, rounds, blocks, walk->iv); kernel_neon_end(); - err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE); + err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE); } return err; } +static int cbc_decrypt(struct skcipher_request *req) +{ + struct skcipher_walk walk; + int err; + + err = skcipher_walk_virt(&walk, req, false); + if (err) + return err; + return cbc_decrypt_walk(req, &walk); +} + static int cts_cbc_init_tfm(struct crypto_skcipher *tfm) { crypto_skcipher_set_reqsize(tfm, sizeof(struct cts_cbc_req_ctx)); @@ -250,22 +268,12 @@ static int cts_cbc_encrypt(struct skcipher_request *req) } if (cbc_blocks > 0) { - unsigned int blocks; - skcipher_request_set_crypt(&rctx->subreq, req->src, req->dst, cbc_blocks * AES_BLOCK_SIZE, req->iv); - err = skcipher_walk_virt(&walk, &rctx->subreq, false); - - while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { - kernel_neon_begin(); - aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr, - ctx->key_enc, rounds, blocks, walk.iv); - kernel_neon_end(); - err = skcipher_walk_done(&walk, - walk.nbytes % AES_BLOCK_SIZE); - } + err = skcipher_walk_virt(&walk, &rctx->subreq, false) ?: + cbc_encrypt_walk(&rctx->subreq, &walk); if (err) return err; @@ -315,22 +323,12 @@ static int cts_cbc_decrypt(struct skcipher_request *req) } if (cbc_blocks > 0) { - unsigned int blocks; - skcipher_request_set_crypt(&rctx->subreq, req->src, req->dst, cbc_blocks * AES_BLOCK_SIZE, req->iv); - err = skcipher_walk_virt(&walk, &rctx->subreq, false); - - while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) { - kernel_neon_begin(); - aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr, - ctx->key_dec, rounds, blocks, walk.iv); - kernel_neon_end(); - err = skcipher_walk_done(&walk, - walk.nbytes % AES_BLOCK_SIZE); - } + err = skcipher_walk_virt(&walk, &rctx->subreq, false) ?: + cbc_decrypt_walk(&rctx->subreq, &walk); if (err) return err;