STRUCT BLAKE2B_CTX(9)

struct blake2b_ctx(9) 💅

okay so bestie, welcome to the Kernel API Manual entry for struct blake2b_ctx(9) — yes, the (9) is giving kernel-section energy, and we're about to make this struct make sense. no cap. 💖

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✨ NAME ✨

struct blake2b_ctx — context for hashing a message with BLAKE2b. that's the whole vibe: it's the little state basket you carry around while BLAKE2b does its thing. 🦋

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🎀 SYNOPSIS 🎀

here's the whole struct, bestie — every field exactly where it lives:

struct blake2b_ctx {
    u64 h[8];
    u64 t[2];
    u64 f[2];
    u8 buf[BLAKE2B_BLOCK_SIZE];
    unsigned int buflen;
    unsigned int outlen;
};

no mystery, just the struct layout. 💅

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🌸 Members 🌸

• h — compression function state. the main-character state, lowkey.
• t — block counter. it's counting blocks, periodt.
• f — finalization indicator. tells you we're at the finalization moment, iykyk.
• buf — partial block buffer; buflen bytes are valid. so it's the holding spot for a partial block, and only buflen bytes in there are valid.
• buflen — number of bytes buffered in buf. exactly what it says, no cap.
• outlen — length of output hash value in bytes, at most BLAKE2B_HASH_SIZE. so it's the output size, and it cannot exceed BLAKE2B_HASH_SIZE. 🫶

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🌈 SEE ALSO 🌈

go look at these besties, fr fr:

• Kernel file ./include/crypto/blake2b.h
• blake2b_init(9)
• blake2b_init_key(9)
• blake2b_update(9)
• blake2b_final(9)
• blake2b(9)

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that's the whole page, bestie 💖 — source/version vibe: ./include/crypto, dated October 2026, for struct blake2b_ctx(9). mwah, go hash something slay. 🎀✨