STRUCT FSCRYPT_PREPARED_KEY(9)

✨ struct fscrypt_prepared_key(9) ✨

okay bestie, so this is a page from the Kernel API Manual and it's literally about struct fscrypt_prepared_key — no cap, the whole vibe is "a key prepared for actual encryption/decryption" 💅

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🎀 NAME 🎀

struct fscrypt_prepared_key — a key prepared for actual encryption/decryption

like, it's the glow-up era of a key. it's ready. it's been prepped. main character energy fr fr 🔥

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🦋 SYNOPSIS 🦋

struct fscrypt_prepared_key {
    struct crypto_sync_skcipher *tfm;
  #ifdef CONFIG_FS_ENCRYPTION_INLINE_CRYPT;
    struct blk_crypto_key *blk_key;
  #endif;
 };

that's it, that's the struct 🫶

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💖 Members 💖

• tfm — the crypto API transform object ✨ like the actual machinery doing the crypto thing
• blk_key — the key for blk-crypto 🔑

heads up bestie: blk_key only exists when CONFIG_FS_ENCRYPTION_INLINE_CRYPT is defined — it's living inside that #ifdef, so don't come for me if you don't see it in every build 🙈

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🌸 Description 🌸

Only one of the fields is non-NULL. periodt. 💀

so like, it's either the tfm or the blk_key — never both, never neither. it's giving "pick a lane" and honestly? iconic 👑

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🌈 SEE ALSO 🌈

• Kernel file ./fs/crypto/fscrypt_private.h 🗂️
• fscrypt_require_key(9) 🔐

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and that's the whole page, bestie, you ate that 🍓 go forth and encrypt 💜

— mwah, this one's from ./fs/crypto, dated October 2026, in the Kernel API Manual 🧚✨