The perl program pg_hmac.pl implements functionality to seal (tamper protect) a file to be sent to Nordea PlusGirot PG.
See the following url plusgirot
Download: pg_hmac.pl
Docs: pg_hmac.html
A SAP ABAP version is available
https://sites.google.com/site/ottofsoftware/home/nordea-plusgirot-pg-hmac-sap-abap
Author: Otto Frost working for Nuport
Phone: 0735 196702