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authorEric Biggers <ebiggers@google.com>2019-07-22 19:26:23 +0300
committerEric Biggers <ebiggers@google.com>2019-08-13 05:33:50 +0300
commitadd890c9f9d2d1d79184ded72f23b37b164fc673 (patch)
treecb982f8ac59675b4435c74b10571bc75a0ceb965 /fs/verity
parent4dd893d832cf4da5409e1fecea9c4f6452a93f2b (diff)
downloadlinux-add890c9f9d2d1d79184ded72f23b37b164fc673.tar.xz
fs-verity: add SHA-512 support
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 <ebiggers@google.com>
Diffstat (limited to 'fs/verity')
-rw-r--r--fs/verity/fsverity_private.h2
-rw-r--r--fs/verity/hash_algs.c5
2 files changed, 6 insertions, 1 deletions
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 7df1d67742b8..31e6d7d2389a 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,
+ },
};
/**