STRUCT GHASH_KEY(9)

💖 struct ghash_key 💖

okay bestie, welcome to the struct ghash_key page from the Kernel API Manual — this is literally the prepared key for GHASH, and we're about to go through every single detail together. no cap, no skipped members. ✨

🌸 NAME 🌸

struct ghash_key — Prepared key for GHASH 💅

🎀 SYNOPSIS 🎀

okay so here's the struct, and I'm keeping the preprocessor branches exactly as they are because they matter, bestie:

       struct ghash_key {
         #if defined(CONFIG_CRYPTO_LIB_GF128HASH_ARCH) &&
       defined(CONFIG_PPC64);
           u64 htable[4][2];
         #elif defined(CONFIG_CRYPTO_LIB_GF128HASH_ARCH) &&
       (defined(CONFIG_RISCV) || defined(CONFIG_S390));
           u8 h_raw[GHASH_BLOCK_SIZE];
         #endif;
           struct polyval_elem h;
        };

👑 Members 👑

• htable — the GHASH key format used by the POWER8 assembly code. iconic. 💥
• h_raw — the hash key H, in GHASH format. 🦋
• h — the hash key H, in POLYVAL format. 🌸

🌈 Description 🌈

okay so the move here is simple: use ghash_preparekey to initialize this. that's the instruction, bestie — literally initialize it with ghash_preparekey. 🫶

🦋 SEE ALSO 🦋

Kernel file: ./include/crypto/gf128hash.h

also go check out these icons, in this exact order:

• struct polyval_elem(9)
• struct polyval_key(9)
• struct ghash_ctx(9)
• struct polyval_ctx(9)
• ghash_preparekey(9)
• polyval_preparekey(9)
• ghash_init(9)
• polyval_init(9)
• polyval_import_blkaligned(9)
• polyval_export_blkaligned(9)
• ghash_update(9)
• polyval_update(9)
• ghash_final(9)
• polyval_final(9)
• ghash(9)
• polyval(9)

that's the whole page, bestie 🫶 source/version: ./include/crypto · date: October 2026 · page: struct ghash_key(9) — bye! 💅