--- name: "pskc_get_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_get_key_algparm_chall_checkdigits" --- # pskc\_get\_key\_algparm\_chall\_checkdigits(3) API function ## NAME pskc\_get\_key\_algparm\_chall\_checkdigits - API function ## SYNOPSIS **#include \** **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 Get 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. If *present* is non-NULL, it will be 0 if the field is not present or 1 if it was present. ## RETURNS 1 to indicate a CheckDigits value of true, or 0 to indicate false. ## REPORTING BUGS Report bugs to \. 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.