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    Subject[PATCH v2 07/12] fs-verity: add SHA-512 support
    Date
    From: Eric Biggers <ebiggers@google.com>

    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@google.com>
    ---
    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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