From: Eric Biggers <ebiggers@xxxxxxxxxx> 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 <ebiggers@xxxxxxxxxx> --- 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
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