[PATCH v6 12/17] fs-verity: add SHA-512 support
From: Eric Biggers <ebiggers@kernel.org>
Date: 2019-07-01 15:34:24
Also in:
linux-ext4, linux-f2fs-devel, linux-fscrypt, linux-fsdevel, linux-integrity
Subsystem:
filesystems (vfs and infrastructure), fsverity: read-only file-based authenticity protection, the rest · Maintainers:
Alexander Viro, Christian Brauner, Eric Biggers, Theodore Y. Ts'o, Linus Torvalds
From: Eric Biggers <redacted> Add SHA-512 support to fs-verity. This is primarily a demonstration of the trivial changes needed to support a new hash algorithm in fs-verity; most users will still use SHA-256, due to the smaller space required to store the hashes. But some users may prefer SHA-512. Reviewed-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Eric Biggers <redacted> --- 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 eaa2b3b93bbf..02a547f0667c 100644
--- a/fs/verity/fsverity_private.h
+++ b/fs/verity/fsverity_private.h@@ -29,7 +29,7 @@ struct ahash_request; * Largest digest size among all hash algorithms supported by fs-verity. * Currently assumed to be <= size of fsverity_descriptor::root_hash. */ -#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 c0457915ca10..27cbecb86be7 100644
--- a/fs/verity/hash_algs.c
+++ b/fs/verity/hash_algs.c@@ -17,6 +17,11 @@ struct fsverity_hash_alg fsverity_hash_algs[] = { .digest_size = SHA256_DIGEST_SIZE, .block_size = SHA256_BLOCK_SIZE, }, + [FS_VERITY_HASH_ALG_SHA512] = { + .name = "sha512", + .digest_size = SHA512_DIGEST_SIZE, + .block_size = SHA512_BLOCK_SIZE, + }, }; /**
diff --git a/include/uapi/linux/fsverity.h b/include/uapi/linux/fsverity.h
index 57d1d7fc0c34..da0daf6c193b 100644
--- a/include/uapi/linux/fsverity.h
+++ b/include/uapi/linux/fsverity.h@@ -14,6 +14,7 @@ #include <linux/types.h> #define FS_VERITY_HASH_ALG_SHA256 1 +#define FS_VERITY_HASH_ALG_SHA512 2 struct fsverity_enable_arg { __u32 version;
--
2.22.0