ecryptfs_ve...tok_from_key(9)

💅 ecryptfs_verify_auth_tok_from_key — Kernel API Manual ✨

okay bestie, so this little cutie lives in the Kernel API Manual and its whole personality is: "is this auth token actually valid or are we being catfished?" 🕵️‍♀️ That's it. That's the vibe. Let's get into it 💖

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🌸 SYNOPSIS 🌸

int ecryptfs_verify_auth_tok_from_key (struct key *auth_tok_key , struct
ecryptfs_auth_tok **auth_tok );

no cap, that's literally the whole signature 🫶

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🎀 ARGUMENTS 🎀

• auth_tok_key — the struct key * that's holding the authentication token. it's giving "the bag where the token lives" 👜
• auth_tok — the authentication token itself, handed over as a struct ecryptfs_auth_tok **. double pointer moment, main character energy ✨

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🦋 DESCRIPTION 🦋

so here's the tea, bestie 🍓: this function does a vibe check on your auth tok and reports back like the world's most honest group chat.

• Returns zero on a valid auth tok — slay, we're so back 👑
• -EINVAL if the payload is invalid — literally not it, the payload is sus 😭
• -EKEYREVOKED if the key was revoked before we acquired its semaphore — awkward timing fr fr, the semaphore came in late and the key already got the boot 💀

⚠️ watch those two negative returns carefully, bestie — -EINVAL and -EKEYREVOKED mean two totally different things and you do not wanna mix them up 🙈

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🌈 SEE ALSO 🌈

the whole friend group, all in the kernel file ./fs/ecryptfs/keystore.c — go say hi 🫶

• ecryptfs_parse_packet_length(9)
• ecryptfs_write_packet_length(9)
• ecryptfs_verify_version(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)

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and that's the whole page, bestie 🧚💜 this icon of a manpage came from ./fs/ecryptfs, dated October 2026 — bookmark it, screenshot it, put it on your mood board 💅✨