fsverity_hash_block(9)

💖 fsverity_hash_block(9) 💖

okay so bestie, welcome to the Kernel API Manual page for fsverity_hash_block — it is literally here to hash one single data or hash block, and we are obsessed. 🦋

✨ NAME ✨

fsverity_hash_block — hash a single data or hash block

🫶 SYNOPSIS 🫶

it’s giving this exact signature, bestie:

void fsverity_hash_block (const struct merkle_tree_params *params ,
       const void *data , u8 *out );

💅 ARGUMENTS 💅

• params — the Merkle tree’s parameters. yes, the whole tree’s lil config moment. 🌈
• data — virtual address of a buffer containing the block to hash. literally the address of the buffer holding the block. 🎀
• out — output digest, size params->digest_size bytes. this is where the digest goes, and its size is exactly params->digest_size bytes. 💜

🌸 DESCRIPTION 🌸

okay so the whole vibe: hash a single data or hash block. that’s the main-character job. 🔥

and the tea is: the hash is salted if a salt is specified in the Merkle tree parameters. if that salt is there in the Merkle tree parameters, the hash gets salted. periodt. 💅

👑 SEE ALSO 👑

• Kernel file: ./fs/verity/hash_algs.c
• fsverity_get_hash_alg(9)
• fsverity_prepare_hash_state(9)
• fsverity_hash_buffer(9)

these are the related icons to check out if you want the full fsverity friend group. 🫶

cute sign-off bestie: source/version ./fs/verity, dated October 2026, for the fsverity_hash_block(9) page itself. slay. 💅✨