ocs_hcu_write_key(9)

🎀 ocs_hcu_write_key(9) 🎀

okay bestie, welcome to the ocs_hcu_write_key(9) page from the Kernel API Manual — section 9, no cap. This function’s whole main character moment is getting a key into the OCS HMAC KEY registers. ✨

🌸 NAME 🌸

ocs_hcu_write_key — write a key to the OCS HMAC KEY registers, periodt.

✨ SYNOPSIS ✨

Here’s the signature, character-for-character, so don’t let the group chat edit it:

int ocs_hcu_write_key (struct ocs_hcu_dev *hcu_dev , const u8 *key , size_t len );

💅 ARGUMENTS 💅

• hcu_dev — the OCS HCU device the key should be written to.
• key — the key to be written.
• len — the size of the key to write. It must be OCS_HCU_HW_KEY_LEN.

⚠️ bestie, len is not vibes-based: it must be OCS_HCU_HW_KEY_LEN. no exceptions 💀

🔥 RETURN 🔥

It returns 0 on success, and a negative error code otherwise. That’s the whole return mood. 💅

🦋 SEE ALSO 🦋

Kernel file ./drivers/crypto/intel/keembay/ocs-hcu.c — and the whole reference squad:

• struct ocs_hcu_dma_entry(9)
• struct ocs_hcu_dma_list(9)
• ocs_hcu_wait_busy(9)
• ocs_hcu_get_intermediate_data(9)
• ocs_hcu_set_intermediate_data(9)
• ocs_hcu_hw_cfg(9)
• ocs_hcu_clear_key(9)
• ocs_hcu_ll_dma_start(9)
• ocs_hcu_hash_init(9)
• ocs_hcu_hash_update(9)
• ocs_hcu_hash_finup(9)
• ocs_hcu_hash_final(9)
• ocs_hcu_digest(9)
• ocs_hcu_hmac(9)

Source/version: ./drivers/crypto/intel/keembay · date: October 2026 · page: ocs_hcu_write_key(9) — bye bestie, go slay that key 🫶✨