From patchwork Wed Jul 14 05:45:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Mueller X-Patchwork-Id: 12376017 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 X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2207BC11F67 for ; Wed, 14 Jul 2021 05:52:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B5BB613B9 for ; Wed, 14 Jul 2021 05:52:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237980AbhGNFy6 (ORCPT ); Wed, 14 Jul 2021 01:54:58 -0400 Received: from mo4-p04-ob.smtp.rzone.de ([81.169.146.223]:13894 "EHLO mo4-p04-ob.smtp.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237957AbhGNFy5 (ORCPT ); Wed, 14 Jul 2021 01:54:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; t=1626241857; s=strato-dkim-0002; d=chronox.de; h=References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Cc:Date: From:Subject:Sender; bh=kIn18Gl5jJH4Qdjhpwk/B77xDmu22AE5ZZyc01lwBWU=; b=dlKtEsaKCju2aKn8wTYqlt3fydAvh0U7DKx1ZOMm0kfyF3b6+/C4M6omw+GL8NMD8l +hTK1PNgTkWxr1/2Ad7xOG6RSNOQvUrJ1RPlYk0dcWxwbygIqzvT/ZeuEg3ssqSPYAXL kbprzolGu/bCp0FjItI2NSHGN7Ne3I7AWKzZJRCmXqp08dhMcW9DETAkpWfNGdbvVB5N AT7q+9RJ+xSxshYwr+UuO4kBm2nPhyYr28xfKmfzpW/L9Fg6/Pmy2W/7yzsDkH30mI/C 2/ZSCTXwdqqShOQfXMPJvisPG0iRzN8ywSSMvu74KqwkcuS2jMHExGWd43OX8KxEYPfN L2nQ== Authentication-Results: strato.com; dkim=none X-RZG-AUTH: ":P2ERcEykfu11Y98lp/T7+hdri+uKZK8TKWEqNyiHySGSa9k9xmwdNnzHHXPSI/SaRQ==" X-RZG-CLASS-ID: mo00 Received: from positron.chronox.de by smtp.strato.de (RZmta 47.28.1 DYNA|AUTH) with ESMTPSA id N0753fx6E5ouwyZ (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Wed, 14 Jul 2021 07:50:56 +0200 (CEST) From: Stephan =?iso-8859-1?q?M=FCller?= To: Tso Ted , linux-crypto@vger.kernel.org Cc: Willy Tarreau , Nicolai Stange , LKML , Arnd Bergmann , Greg Kroah-Hartman , "Eric W. Biederman" , "Alexander E. Patrakov" , "Ahmed S. Darwish" , Matthew Garrett , Vito Caputo , Andreas Dilger , Jan Kara , Ray Strode , William Jon McCann , zhangjs , Andy Lutomirski , Florian Weimer , Lennart Poettering , Peter Matthias , Marcelo Henrique Cerri , Neil Horman , Randy Dunlap , Julia Lawall , Dan Carpenter , Andy Lavr , Eric Biggers , "Jason A. Donenfeld" , Petr Tesarik , John Haxby , Alexander Lobakin Subject: [PATCH v41 05/13] LRNG - add common generic hash support Date: Wed, 14 Jul 2021 07:45:48 +0200 Message-ID: <2460884.q7F22EL2Vm@positron.chronox.de> In-Reply-To: <7822794.ITf6fX9eNu@positron.chronox.de> References: <7822794.ITf6fX9eNu@positron.chronox.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The LRNG switchable DRNG support also allows the replacement of the hash implementation used as conditioning component. The common generic hash support code provides the required callbacks using the synchronous hash implementations of the kernel crypto API. All synchronous hash implementations supported by the kernel crypto API can be used as part of the LRNG with this generic support. The generic support is intended to be configured by separate switchable DRNG backends. CC: Torsten Duwe CC: "Eric W. Biederman" CC: "Alexander E. Patrakov" CC: "Ahmed S. Darwish" CC: "Theodore Y. Ts'o" CC: Willy Tarreau CC: Matthew Garrett CC: Vito Caputo CC: Andreas Dilger CC: Jan Kara CC: Ray Strode CC: William Jon McCann CC: zhangjs CC: Andy Lutomirski CC: Florian Weimer CC: Lennart Poettering CC: Nicolai Stange CC: Alexander Lobakin CC: "Peter, Matthias" CC: Marcelo Henrique Cerri CC: Neil Horman Signed-off-by: Stephan Mueller --- drivers/char/lrng/Kconfig | 8 +++ drivers/char/lrng/Makefile | 1 + drivers/char/lrng/lrng_kcapi_hash.c | 103 ++++++++++++++++++++++++++++ drivers/char/lrng/lrng_kcapi_hash.h | 20 ++++++ 4 files changed, 132 insertions(+) create mode 100644 drivers/char/lrng/lrng_kcapi_hash.c create mode 100644 drivers/char/lrng/lrng_kcapi_hash.h diff --git a/drivers/char/lrng/Kconfig b/drivers/char/lrng/Kconfig index c10a0c3f2015..ab17c45a356b 100644 --- a/drivers/char/lrng/Kconfig +++ b/drivers/char/lrng/Kconfig @@ -209,4 +209,12 @@ menuconfig LRNG_DRNG_SWITCH accessible via the external interfaces. With this configuration option other DRNGs can be selected and loaded at runtime. +if LRNG_DRNG_SWITCH + +config LRNG_KCAPI_HASH + bool + select CRYPTO_HASH + +endif # LRNG_DRNG_SWITCH + endif # LRNG diff --git a/drivers/char/lrng/Makefile b/drivers/char/lrng/Makefile index 0eb4a6849c88..40f8826edeeb 100644 --- a/drivers/char/lrng/Makefile +++ b/drivers/char/lrng/Makefile @@ -11,3 +11,4 @@ obj-y += lrng_pool.o lrng_aux.o \ obj-$(CONFIG_NUMA) += lrng_numa.o obj-$(CONFIG_SYSCTL) += lrng_proc.o obj-$(CONFIG_LRNG_DRNG_SWITCH) += lrng_switch.o +obj-$(CONFIG_LRNG_KCAPI_HASH) += lrng_kcapi_hash.o diff --git a/drivers/char/lrng/lrng_kcapi_hash.c b/drivers/char/lrng/lrng_kcapi_hash.c new file mode 100644 index 000000000000..9647d980e468 --- /dev/null +++ b/drivers/char/lrng/lrng_kcapi_hash.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause +/* + * Backend for providing the hash primitive using the kernel crypto API. + * + * Copyright (C) 2021, Stephan Mueller + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include + +#include "lrng_kcapi_hash.h" + +struct lrng_hash_info { + struct crypto_shash *tfm; +}; + +static inline void _lrng_kcapi_hash_free(struct lrng_hash_info *lrng_hash) +{ + struct crypto_shash *tfm = lrng_hash->tfm; + + crypto_free_shash(tfm); + kfree(lrng_hash); +} + +void *lrng_kcapi_hash_alloc(const char *name) +{ + struct lrng_hash_info *lrng_hash; + struct crypto_shash *tfm; + int ret; + + if (!name) { + pr_err("Hash name missing\n"); + return ERR_PTR(-EINVAL); + } + + tfm = crypto_alloc_shash(name, 0, 0); + if (IS_ERR(tfm)) { + pr_err("could not allocate hash %s\n", name); + return ERR_CAST(tfm); + } + + ret = sizeof(struct lrng_hash_info); + lrng_hash = kmalloc(ret, GFP_KERNEL); + if (!lrng_hash) { + crypto_free_shash(tfm); + return ERR_PTR(-ENOMEM); + } + + lrng_hash->tfm = tfm; + + pr_info("Hash %s allocated\n", name); + + return lrng_hash; +} +EXPORT_SYMBOL(lrng_kcapi_hash_alloc); + +u32 lrng_kcapi_hash_digestsize(void *hash) +{ + struct lrng_hash_info *lrng_hash = (struct lrng_hash_info *)hash; + struct crypto_shash *tfm = lrng_hash->tfm; + + return crypto_shash_digestsize(tfm); +} +EXPORT_SYMBOL(lrng_kcapi_hash_digestsize); + +void lrng_kcapi_hash_dealloc(void *hash) +{ + struct lrng_hash_info *lrng_hash = (struct lrng_hash_info *)hash; + + _lrng_kcapi_hash_free(lrng_hash); + pr_info("Hash deallocated\n"); +} +EXPORT_SYMBOL(lrng_kcapi_hash_dealloc); + +int lrng_kcapi_hash_init(struct shash_desc *shash, void *hash) +{ + struct lrng_hash_info *lrng_hash = (struct lrng_hash_info *)hash; + struct crypto_shash *tfm = lrng_hash->tfm; + + shash->tfm = tfm; + return crypto_shash_init(shash); +} +EXPORT_SYMBOL(lrng_kcapi_hash_init); + +int lrng_kcapi_hash_update(struct shash_desc *shash, const u8 *inbuf, + u32 inbuflen) +{ + return crypto_shash_update(shash, inbuf, inbuflen); +} +EXPORT_SYMBOL(lrng_kcapi_hash_update); + +int lrng_kcapi_hash_final(struct shash_desc *shash, u8 *digest) +{ + return crypto_shash_final(shash, digest); +} +EXPORT_SYMBOL(lrng_kcapi_hash_final); + +void lrng_kcapi_hash_zero(struct shash_desc *shash) +{ + shash_desc_zero(shash); +} +EXPORT_SYMBOL(lrng_kcapi_hash_zero); diff --git a/drivers/char/lrng/lrng_kcapi_hash.h b/drivers/char/lrng/lrng_kcapi_hash.h new file mode 100644 index 000000000000..2f94558d2dd6 --- /dev/null +++ b/drivers/char/lrng/lrng_kcapi_hash.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */ +/* + * Copyright (C) 2020 - 2021, Stephan Mueller + */ + +#ifndef _LRNG_KCAPI_HASH_H +#define _LRNG_KCAPI_HASH_H + +#include + +void *lrng_kcapi_hash_alloc(const char *name); +u32 lrng_kcapi_hash_digestsize(void *hash); +void lrng_kcapi_hash_dealloc(void *hash); +int lrng_kcapi_hash_init(struct shash_desc *shash, void *hash); +int lrng_kcapi_hash_update(struct shash_desc *shash, const u8 *inbuf, + u32 inbuflen); +int lrng_kcapi_hash_final(struct shash_desc *shash, u8 *digest); +void lrng_kcapi_hash_zero(struct shash_desc *shash); + +#endif /* _LRNG_KCAPI_HASH_H */