Return-Path: Received: from mail.kernel.org ([198.145.29.99]:52162 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728081AbeKBH7Q (ORCPT ); Fri, 2 Nov 2018 03:59:16 -0400 From: Eric Biggers To: linux-fscrypt@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, "Theodore Y . Ts'o" , Jaegeuk Kim , Victor Hsieh , Chandan Rajendra Subject: [PATCH v2 07/12] fs-verity: add SHA-512 support Date: Thu, 1 Nov 2018 15:52:25 -0700 Message-Id: <20181101225230.88058-8-ebiggers@kernel.org> In-Reply-To: <20181101225230.88058-1-ebiggers@kernel.org> References: <20181101225230.88058-1-ebiggers@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-ext4-owner@vger.kernel.org List-ID: From: Eric Biggers Add SHA-512 support to fs-verity. This is primarily a demonstration of the (small) changes needed to support a new hash algorithm; it's anticipated that most users will still prefer SHA-256 due to the smaller space required to store the hashes, though some may prefer SHA-512. Signed-off-by: Eric Biggers --- fs/verity/fsverity_private.h | 2 +- fs/verity/hash_algs.c | 5 +++++ include/uapi/linux/fsverity.h | 1 + 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/fs/verity/fsverity_private.h b/fs/verity/fsverity_private.h index dfdbac3874d74..c3a261a598557 100644 --- a/fs/verity/fsverity_private.h +++ b/fs/verity/fsverity_private.h @@ -30,7 +30,7 @@ * Largest digest size among all hash algorithms supported by fs-verity. This * can be increased if needed. */ -#define FS_VERITY_MAX_DIGEST_SIZE SHA256_DIGEST_SIZE +#define FS_VERITY_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE /* A hash algorithm supported by fs-verity */ struct fsverity_hash_alg { diff --git a/fs/verity/hash_algs.c b/fs/verity/hash_algs.c index 9c19c9553f120..3174a0c08785d 100644 --- a/fs/verity/hash_algs.c +++ b/fs/verity/hash_algs.c @@ -18,6 +18,11 @@ struct fsverity_hash_alg fsverity_hash_algs[] = { .digest_size = 32, .cryptographic = true, }, + [FS_VERITY_ALG_SHA512] = { + .name = "sha512", + .digest_size = 64, + .cryptographic = true, + }, }; /* diff --git a/include/uapi/linux/fsverity.h b/include/uapi/linux/fsverity.h index 55b9f32676220..67ed830ae2ece 100644 --- a/include/uapi/linux/fsverity.h +++ b/include/uapi/linux/fsverity.h @@ -28,6 +28,7 @@ struct fsverity_digest { /* Supported hash algorithms */ #define FS_VERITY_ALG_SHA256 1 +#define FS_VERITY_ALG_SHA512 2 /* Metadata stored near the end of verity files, after the Merkle tree */ /* This structure is 64 bytes long */ -- 2.19.1.568.g152ad8e336-goog