ecryptfs_par...acket_length(9)

💅 ecryptfs_parse_packet_length(9) — from the Kernel API Manual, bestie

Okay so this is a page straight out of the Kernel API Manual, and the function it's about is ecryptfs_parse_packet_length, bestie. It lives down in the ecryptfs keystore code, and honestly it's giving "small function, big responsibilities" energy. Let's get into it 🫶

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✨ NAME ✨

ecryptfs_parse_packet_length —

Yes, the original NAME line literally just ends in a dash with nothing after it, and no, I'm not gonna make something up 💀 That's the whole name entry. Slay, I guess.

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🎀 SYNOPSIS 🎀

int ecryptfs_parse_packet_length (unsigned char *data , size_t *size ,
       size_t *length_size );

Three args, one int coming back at you. Very demure, very mindful, very C 🤍

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🦋 ARGUMENTS 🦋

• data — a pointer to memory that's holding a length sitting at some offset, iykyk. It's unsigned char *, so treat those bytes with respect 👑
• size — the function writes the decoded size into this memory address. And here's the important part, no cap: it's zero on error. So if something goes sideways, you get a big fat 0 here 🙈
• length_size — the number of bytes that the encoded length actually occupies. So like, how much room the encoded length ate up 📏

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🌸 DESCRIPTION 🌸

Short and sweet, bestie: it returns zero on success; non-zero on error. That's literally the description. That's it. That's the whole vibe check 💀✨

Lowkey obsessed with how the whole DESCRIPTION is one sentence. Main character energy of a function that knows exactly what it does and refuses to elaborate 💅

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🧚 SEE ALSO 🧚

The whole ecryptfs keystore crew, plus the file it lives in:

• Kernel file ./fs/ecryptfs/keystore.c
• ecryptfs_write_packet_length(9)
• ecryptfs_verify_version(9)
• ecryptfs_verify_auth_tok_from_key(9)
• ecryptfs_find_auth_tok_for_sig(9)
• ecryptfs_parse_tag_70_packet(9)
• decrypt_pki_encrypted_session_key(9)
• parse_tag_1_packet(9)
• parse_tag_3_packet(9)
• parse_tag_11_packet(9)
• decrypt_passphrase_encrypted_session_key(9)
• ecryptfs_parse_packet_set(9)
• write_tag_1_packet(9)
• write_tag_11_packet(9)
• write_tag_3_packet(9)
• ecryptfs_generate_key_packet_set(9)

Like, the entire packet-parsing friend group showed up to the group chat 🌈🫶

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⭐ Sign-off ⭐

This lil cutie comes to you from ./fs/ecryptfs, dated October 2026 — so yeah, mark your calendars bestie, the keystore source is where it lives, it's iconic, it ate, periodt 💖🔥

Go forth and parse those packet lengths. You got this 👑💜