From patchwork Fri Jan 3 03:58:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Biggers X-Patchwork-Id: 11316381 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0CA406C1 for ; Fri, 3 Jan 2020 04:01:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E098A222C3 for ; Fri, 3 Jan 2020 04:01:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578024095; bh=oP03XBrmE4G+p/Xh8RaSzFf/+MvvdLPxYmtN3QYvfM8=; h=From:To:Subject:Date:In-Reply-To:References:List-ID:From; b=W+d365cVWv3ywJwxt75JP+6JBhOTUwSIjfD9k6ykRCMuA6liOldURbZP1sKF6kH9G ntm/5PhqSUcJbEc+eOFKggQb7mBTX8EIOw5cl6qWtvSOvkf/4o3lnCDfNIBWbiLoGk 2HeAv74yTW95uLfaTsvb1qUsHuEzjvGNnPaOCDjE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727213AbgACEBa (ORCPT ); Thu, 2 Jan 2020 23:01:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:33636 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727210AbgACEB2 (ORCPT ); Thu, 2 Jan 2020 23:01:28 -0500 Received: from sol.localdomain (c-24-5-143-220.hsd1.ca.comcast.net [24.5.143.220]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CF48724649 for ; Fri, 3 Jan 2020 04:01:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578024087; bh=oP03XBrmE4G+p/Xh8RaSzFf/+MvvdLPxYmtN3QYvfM8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=x/BPPO0rVcV/6kGDGvrclV8Qmgj0XcfEoPlxxh0jpw7uHdI3MWsOxVN7YXIbIXC90 hV/uAQ/QeCk1dLSLimfExkcTN6cnBUgsjOVtY2AAtHJ4STYSh1e7R7pv4gsUp7h76W faJDtALvrtHuVXFUpP7WUDfUoVGaxKP2yBDbE1gE= From: Eric Biggers To: linux-crypto@vger.kernel.org Subject: [PATCH v2 19/28] crypto: chacha20poly1305 - use crypto_grab_ahash() and simplify error paths Date: Thu, 2 Jan 2020 19:58:59 -0800 Message-Id: <20200103035908.12048-20-ebiggers@kernel.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200103035908.12048-1-ebiggers@kernel.org> References: <20200103035908.12048-1-ebiggers@kernel.org> MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Eric Biggers Make the rfc7539 and rfc7539esp templates use the new function crypto_grab_ahash() to initialize their ahash spawn. This is needed to make all spawns be initialized in a consistent way. Also simplify the error handling by taking advantage of crypto_drop_*() now accepting (as a no-op) spawns that haven't been initialized yet, and by taking advantage of crypto_grab_*() now handling ERR_PTR() names. Signed-off-by: Eric Biggers --- crypto/chacha20poly1305.c | 84 +++++++++++++-------------------------- 1 file changed, 27 insertions(+), 57 deletions(-) diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c index fcb8ec4ba083..72543cfa45ef 100644 --- a/crypto/chacha20poly1305.c +++ b/crypto/chacha20poly1305.c @@ -16,8 +16,6 @@ #include #include -#include "internal.h" - struct chachapoly_instance_ctx { struct crypto_skcipher_spawn chacha; struct crypto_ahash_spawn poly; @@ -565,11 +563,9 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, struct crypto_attr_type *algt; u32 mask; struct aead_instance *inst; - struct skcipher_alg *chacha; - struct crypto_alg *poly; - struct hash_alg_common *poly_hash; struct chachapoly_instance_ctx *ctx; - const char *chacha_name, *poly_name; + struct skcipher_alg *chacha; + struct hash_alg_common *poly; int err; if (ivsize > CHACHAPOLY_IV_SIZE) @@ -584,68 +580,51 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, mask = crypto_requires_sync(algt->type, algt->mask); - chacha_name = crypto_attr_alg_name(tb[1]); - if (IS_ERR(chacha_name)) - return PTR_ERR(chacha_name); - poly_name = crypto_attr_alg_name(tb[2]); - if (IS_ERR(poly_name)) - return PTR_ERR(poly_name); - - poly = crypto_find_alg(poly_name, &crypto_ahash_type, - CRYPTO_ALG_TYPE_HASH, - CRYPTO_ALG_TYPE_AHASH_MASK | mask); - if (IS_ERR(poly)) - return PTR_ERR(poly); - poly_hash = __crypto_hash_alg_common(poly); - - err = -EINVAL; - if (poly_hash->digestsize != POLY1305_DIGEST_SIZE) - goto out_put_poly; - - err = -ENOMEM; inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); if (!inst) - goto out_put_poly; - + return -ENOMEM; ctx = aead_instance_ctx(inst); ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize; - err = crypto_init_ahash_spawn(&ctx->poly, poly_hash, - aead_crypto_instance(inst)); - if (err) - goto err_free_inst; err = crypto_grab_skcipher(&ctx->chacha, aead_crypto_instance(inst), - chacha_name, 0, mask); + crypto_attr_alg_name(tb[1]), 0, mask); if (err) - goto err_drop_poly; - + goto err_free_inst; chacha = crypto_spawn_skcipher_alg(&ctx->chacha); + err = crypto_grab_ahash(&ctx->poly, aead_crypto_instance(inst), + crypto_attr_alg_name(tb[2]), 0, mask); + if (err) + goto err_free_inst; + poly = crypto_spawn_ahash_alg(&ctx->poly); + err = -EINVAL; + if (poly->digestsize != POLY1305_DIGEST_SIZE) + goto err_free_inst; /* Need 16-byte IV size, including Initial Block Counter value */ if (crypto_skcipher_alg_ivsize(chacha) != CHACHA_IV_SIZE) - goto out_drop_chacha; + goto err_free_inst; /* Not a stream cipher? */ if (chacha->base.cra_blocksize != 1) - goto out_drop_chacha; + goto err_free_inst; err = -ENAMETOOLONG; if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s,%s)", name, chacha->base.cra_name, - poly->cra_name) >= CRYPTO_MAX_ALG_NAME) - goto out_drop_chacha; + poly->base.cra_name) >= CRYPTO_MAX_ALG_NAME) + goto err_free_inst; if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s,%s)", name, chacha->base.cra_driver_name, - poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) - goto out_drop_chacha; + poly->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) + goto err_free_inst; - inst->alg.base.cra_flags = (chacha->base.cra_flags | poly->cra_flags) & - CRYPTO_ALG_ASYNC; + inst->alg.base.cra_flags = (chacha->base.cra_flags | + poly->base.cra_flags) & CRYPTO_ALG_ASYNC; inst->alg.base.cra_priority = (chacha->base.cra_priority + - poly->cra_priority) / 2; + poly->base.cra_priority) / 2; inst->alg.base.cra_blocksize = 1; inst->alg.base.cra_alignmask = chacha->base.cra_alignmask | - poly->cra_alignmask; + poly->base.cra_alignmask; inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) + ctx->saltlen; inst->alg.ivsize = ivsize; @@ -661,20 +640,11 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, inst->free = chachapoly_free; err = aead_register_instance(tmpl, inst); - if (err) - goto out_drop_chacha; - -out_put_poly: - crypto_mod_put(poly); - return err; - -out_drop_chacha: - crypto_drop_skcipher(&ctx->chacha); -err_drop_poly: - crypto_drop_ahash(&ctx->poly); + if (err) { err_free_inst: - kfree(inst); - goto out_put_poly; + chachapoly_free(inst); + } + return err; } static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb)