---
name: "pskc_set_key_algparm_chall_checkdigits"
section: "3"
platform: "linux"
package: "oath-toolkit"
version: "2.6.15-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/pskc_set_key_algparm_chall_checkdigits"
---

# pskc\_set\_key\_algparm\_chall\_checkdigits(3)

API function

## NAME

pskc\_set\_key\_algparm\_chall\_checkdigits - API function

## SYNOPSIS

**#include \<pskc.h\>**

**void pskc\_set\_key\_algparm\_chall\_checkdigits(pskc\_key\_t \*** *key***, int** *checkdigit***);**

## ARGUMENTS

- pskc\_key\_t \* key

  a **pskc\_key\_t** handle, from **pskc\_get\_keypackage()**.

- int checkdigit

  non-zero to indicate setting true CheckDigit, 0 otherwise.

## DESCRIPTION

Set the PSKC KeyPackage Key AlgorithmParameters ChallengeFormat CheckDigits value.  This attribute indicates whether a device needs to check the appended Luhn check digit, as defined in \[ISOIEC7812\], contained in a challenge.  This is only valid if the 'Encoding' attribute is set to 'DECIMAL'.  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.

## SINCE

2\.2.0

## 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.