pskc_get_key_a...ll_checkdigits(3)

💖 pskc_get_key_a...ll_checkdigits(3) 💖

Okay so this is the libpskc manual page for pskc_get_key_algparm_chall_checkdigits, and it's lowkey a tiny function with a very specific job. Bestie, we're gonna read it together and not skip a single argument, value, or caveat. 🎀✨

✨ NAME ✨

pskc_get_key_algparm_chall_checkdigits — API function

🎀 SYNOPSIS 🎀

#include <pskc.h>

int pskc_get_key_algparm_chall_checkdigits(pskc_key_t * key, int *
       present);

🫶 ARGUMENTS 🫶

• pskc_key_t * key — a pskc_key_t handle, from pskc_get_keypackage().
• int * present — output variable indicating whether data was provided or not.

🌸 DESCRIPTION 🌸

So you're getting the PSKC KeyPackage Key AlgorithmParameters ChallengeFormat CheckDigits value. That CheckDigits attribute is the one that says whether a device needs to check the appended Luhn check digit, as defined in [ISOIEC7812], that's contained in a challenge. 🎀

This is only valid if the 'Encoding' attribute is set to 'DECIMAL'. Like, only then, bestie. A value of TRUE indicates that the device will check the appended Luhn check digit in a provided challenge. A value of FALSE indicates that the device will not check the appended Luhn check digit in the challenge. No cap. 💅

If present is non-NULL, it will be 0 if the field is not present or 1 if it was present. That's the little presence vibe check. ✨

🔥 RETURNS 🔥

1 to indicate a CheckDigits value of true, or 0 to indicate false. Periodt. 💖

💀 REPORTING BUGS 💀

Report bugs to <oath-toolkit-help@nongnu.org>. 🫶

libpskc home page: https://oath-toolkit.codeberg.page/

General help using GNU software: http://www.gnu.org/gethelp/

👑 COPYRIGHT 👑

Copyright © 2009-2026 Simon Josefsson.

Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.

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Okay that's the page! Footer sign-off: source libpskc, version 2.6.15 — and there's no date in the original footer line, so we're not making one up, periodt. 💅🦋