From patchwork Thu Feb 10 23:28:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nathan Huckleberry X-Patchwork-Id: 541545 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2BFFC433F5 for ; Thu, 10 Feb 2022 23:28:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235301AbiBJX2f (ORCPT ); Thu, 10 Feb 2022 18:28:35 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:41196 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345655AbiBJX2f (ORCPT ); Thu, 10 Feb 2022 18:28:35 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3F207116D for ; Thu, 10 Feb 2022 15:28:35 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id z15-20020a25bb0f000000b00613388c7d99so15316445ybg.8 for ; Thu, 10 Feb 2022 15:28:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:message-id:mime-version:subject:from:to:cc :content-transfer-encoding; bh=X4pGovICiPQ0U+Wm+4Mu3dfpVMwLlQ+3KkIwYwKv2HY=; b=JwD33JaCAdwyGy0A45Vk6WDnFItu+aqp8GMTky89wFARQDZXlfOVNqaT9dWXtuQT0W oIIYuvVAGp5n3+826axpuJSMg9Ywdo+SGL8/b7YiTHwrZMcSnXamKw9lqcbjMmVCT0Kd Tv36pXuj+yUVH6Xe7DoITIf74d4kX+Vh3eWP3jpNPZwuveodR/20y9cieYqS+Wu2g48a zCocD7ZuDG7AG2MunqE34VUGiJGG3cFJG2x8PAeVt4JDg7ZBDuo1ChClCnvjMVxSk057 8QP4ueC/UG2ztofFRdQKXWJcpMXr1MAwtMm+ZV1+lNV60BD6xSedODK4Y+qaZHGQvpf5 fqCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc :content-transfer-encoding; bh=X4pGovICiPQ0U+Wm+4Mu3dfpVMwLlQ+3KkIwYwKv2HY=; b=3bappqV9v02c3s6cdrnOoLTbfS3Kbe9yNoELCPDwOa6TD9+cJigHcQqDbCpY5GTnA7 N7r5NArSyXYywUsYNKS6q6UmYJWI5KmWUIPQ8pWfZQcnoMMwFwfKWulh9e2CHETdmNiQ lTAjKadsK5yTQYsKITaaC/YjIBCgAfAC0c1RA3u0NzakWs1VzpwmSw6Agvfq+ghwiU8/ NvhPGO4eQDSlS2/2GXjh2mFwfzqDvAcPtac2vP2Zt68pOCa82Q9NS1ZQoKHcRXS30hNH 8yjoWw/XHbT+C+l/xkUVWp3YiuZkOvyuBAbMmHTaLaLlM0WEtZoF4lJhwopfqBNPvyOs c+rw== X-Gm-Message-State: AOAM530JeNM/6CiSwx3Af2shU567TJ2BM0nN6LvGsXmNJ3qRf0EoQKRw VD5VnI+Q0Se5GvOkjTZd8GMYde9YkT/xn8oR4tCcIfvpEIzjQzEPMvkb0abs13VlJz8F+gP+g52 Z6HWSnC2uoulPXW7v2I8vomM6JLAxMKDHUALETomNUuzlw4RRAqMdir93SQcDRg0UdIQ= X-Google-Smtp-Source: ABdhPJxwZ4Y6YJ+RiwWywKVKfsWcJiykReiGnNG6XrsemntyXE/P+wYILD44hJRaJ3u7EJU7Kuy7AT51Ww== X-Received: from nhuck.c.googlers.com ([fda3:e722:ac3:cc00:14:4d90:c0a8:39cc]) (user=nhuck job=sendgmr) by 2002:a25:30d4:: with SMTP id w203mr9052733ybw.511.1644535714443; Thu, 10 Feb 2022 15:28:34 -0800 (PST) Date: Thu, 10 Feb 2022 23:28:05 +0000 Message-Id: <20220210232812.798387-1-nhuck@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.35.1.265.g69c8d7142f-goog Subject: [RFC PATCH v2 0/7] crypto: HCTR2 support From: Nathan Huckleberry To: linux-crypto@vger.kernel.org Cc: Herbert Xu , "David S. Miller" , linux-arm-kernel@lists.infradead.org, Paul Crowley , Eric Biggers , Sami Tolvanen , Ard Biesheuvel , Nathan Huckleberry Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org HCTR2 is a length-preserving encryption mode that is efficient on processors with instructions to accelerate AES and carryless multiplication, e.g. x86 processors with AES-NI and CLMUL, and ARM processors with the ARMv8 Crypto Extensions. HCTR2 is specified in https://ia.cr/2021/1441 "Length-preserving encryption with HCTR2" which shows that if AES is secure and HCTR2 is instantiated with AES, then HCTR2 is secure. Reference code and test vectors are at https://github.com/google/hctr2. As a length-preserving encryption mode, HCTR2 is suitable for applications such as storage encryption where ciphertext expansion is not possible, and thus authenticated encryption cannot be used. Currently, such applications usually use XTS, or in some cases Adiantum. XTS has the disadvantage that it is a narrow-block mode: a bitflip will only change 16 bytes in the resulting ciphertext or plaintext. This reveals more information to an attacker than necessary. HCTR2 is a wide-block mode, so it provides a stronger security property: a bitflip will change the entire message. HCTR2 is somewhat similar to Adiantum, which is also a wide-block mode. However, HCTR2 is designed to take advantage of existing crypto instructions, while Adiantum targets devices without such hardware support. Adiantum is also designed with longer messages in mind, while HCTR2 is designed to be efficient even on short messages. The first intended use of this mode in the kernel is for the encryption of filenames, where for efficiency reasons encryption must be fully deterministic (only one ciphertext for each plaintext) and the existing CBC solution leaks more information than necessary for filenames with common prefixes. HCTR2 uses two passes of an ε-almost-∆-universal hash function called POLYVAL and one pass of a block cipher mode called XCTR. POLYVAL is a polynomial hash designed for efficiency on modern processors and was originally specified for use in AES-GCM-SIV (RFC 8452). XCTR mode is a variant of CTR mode that is more efficient on little-endian machines. This patchset adds HCTR2 to Linux's crypto API, including generic implementations of XCTR and POLYVAL, hardware accelerated implementations of XCTR and POLYVAL for both x86-64 and ARM64, and a templated implementation of HCTR2. Nathan Huckleberry (7): crypto: xctr - Add XCTR support crypto: polyval - Add POLYVAL support crypto: hctr2 - Add HCTR2 support crypto: x86/aesni-xctr: Add accelerated implementation of XCTR crypto: arm64/aes-xctr: Add accelerated implementation of XCTR crypto: x86/polyval: Add PCLMULQDQ accelerated implementation of POLYVAL crypto: arm64/polyval: Add PMULL accelerated implementation of POLYVAL arch/arm64/crypto/Kconfig | 11 +- arch/arm64/crypto/Makefile | 3 + arch/arm64/crypto/aes-glue.c | 72 +- arch/arm64/crypto/aes-modes.S | 130 ++ arch/arm64/crypto/polyval-ce-core.S | 405 ++++++ arch/arm64/crypto/polyval-ce-glue.c | 365 ++++++ arch/x86/crypto/Makefile | 5 +- arch/x86/crypto/aes_xctrby8_avx-x86_64.S | 529 ++++++++ arch/x86/crypto/aesni-intel_asm.S | 70 + arch/x86/crypto/aesni-intel_glue.c | 89 ++ arch/x86/crypto/polyval-clmulni_asm.S | 414 ++++++ arch/x86/crypto/polyval-clmulni_glue.c | 365 ++++++ crypto/Kconfig | 38 + crypto/Makefile | 3 + crypto/hctr2.c | 532 ++++++++ crypto/polyval-generic.c | 199 +++ crypto/tcrypt.c | 10 + crypto/testmgr.c | 20 + crypto/testmgr.h | 1500 ++++++++++++++++++++++ crypto/xctr.c | 193 +++ include/crypto/polyval.h | 22 + 21 files changed, 4970 insertions(+), 5 deletions(-) create mode 100644 arch/arm64/crypto/polyval-ce-core.S create mode 100644 arch/arm64/crypto/polyval-ce-glue.c create mode 100644 arch/x86/crypto/aes_xctrby8_avx-x86_64.S create mode 100644 arch/x86/crypto/polyval-clmulni_asm.S create mode 100644 arch/x86/crypto/polyval-clmulni_glue.c create mode 100644 crypto/hctr2.c create mode 100644 crypto/polyval-generic.c create mode 100644 crypto/xctr.c create mode 100644 include/crypto/polyval.h