pskc\_get\_key\_algparm\_chall\_checkdigits(3) libpskc pskc\_get\_key\_algparm\_chall\_checkdigits(3)

# [NAME](#NAME)

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

# [SYNOPSIS](#SYNOPSIS)

**#include <pskc.h>**

**int pskc\_get\_key\_algparm\_chall\_checkdigits(pskc\_key\_t * key, int * present);**

# [ARGUMENTS](#ARGUMENTS)

[pskc\_key\_t * key](#pskc_key_t)

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

[int * present](#int)

output variable indicating whether data was provided or not.

# [DESCRIPTION](#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](#RETURNS)

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

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to <oath-toolkit-help@nongnu.org>. libpskc home page: https://www.nongnu.org/oath-toolkit/ General help using GNU software: http://www.gnu.org/gethelp/

# [COPYRIGHT](#COPYRIGHT)

Copyright © 2012-2020 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.

2.6.12-dirty libpskc

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Document: pskc_get_key_algparm_chall_checkdigits(3) from oath-toolkit 2.6.12-r13 (Chainguard OS)
Source: https://gitlab.com/oath-toolkit/oath-toolkit.git