crypto_krb5_get_mic(9)

📦 version 7.3.1, in nixpkgs unstable

💅 crypto_krb5_get_mic(9)

okay bestie, welcome to the Kernel API Manual ✨ this one's about slapping a Kerberos integrity checksum onto your buffer, and honestly? it ate.

🎀 NAME

crypto_krb5_get_mic — apply that Kerberos integrity checksum, periodt 💅

🌸 SYNOPSIS

ssize_t crypto_krb5_get_mic (const struct krb5_enctype *krb5 , struct
crypto_shash *shash , const struct krb5_buffer *metadata , struct
scatterlist *sg , unsigned int nr_sg , size_t sg_len , size_t
data_offset , size_t data_len );

✨ ARGUMENTS

  • krb5 — the encoding to use, like literally which flavor of Kerberos we're vibing with 🦋
  • shash — the keyed hash to use, this is the main character of the hashing operation 👑
  • metadata — metadata to add into the hash before adding the data, order matters bestie 🎀
  • sg — scatterlist defining the crypto buffer, that's the whole spread 🫶
  • nr_sg — the number of elements in sg, count 'em ⭐
  • sg_len — the size of the buffer, yes the whole thing 💖
  • data_offset — the offset of the data in the sg buffer, where the actual goods start 🔥
  • data_len — the length of the data, how much of it there is 🌸

💜 DESCRIPTION

Using the specified Kerberos encoding, calculate and insert an integrity checksum into the buffer ✨ that's the whole gig, no cap.

🚨 real talk: the buffer must include space for the checksum at the front. like, you gotta leave room for it upfront or this is not gonna go how you want 💀

On success it returns the size of the secure blob 🌈 — and if it doesn't slay, here's the receipts:

  • -ENOMEM — allocation failure, the allocator said no 🙈
  • -EFAULT — insufficient space, there's just not enough room 😭
  • -EMSGSIZE — the gap for the checksum is too short, awkward 💀

Other errors may also be returned from the crypto layer, so don't come for this manpage if the crypto layer has its own opinions 🧚

🦋 SEE ALSO

Kernel file ./crypto/krb5/krb5_api.c, plus the whole friend group:

and that's the tea, bestie 🍓 this little icon lives in ./crypto/krb5 and was stamped October 2026 — go forth and checksum responsibly, ily 💖🫶

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