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fs-verity: add SHA-512 support

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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>
This commit is contained in:
Eric Biggers 2019-07-22 09:26:23 -07:00
parent 4dd893d832
commit add890c9f9
3 changed files with 7 additions and 1 deletions
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2
fs/verity/fsverity_private.h
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@ -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 {

5
fs/verity/hash_algs.c
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@ -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,
},
};
/**

1
include/uapi/linux/fsverity.h
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@ -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;