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/*
This file is part of Anastasis
Copyright (C) 2020, 2021 Anastasis SARL
Anastasis is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
Anastasis; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file reducer/validation_NL_BSN.c
* @brief Validation for Dutch Buergerservicenummern
* @author Christian Grothoff
*/
#include <string.h>
#include <stdbool.h>
/**
* Function to validate a Dutch Social Security number.
*
* See https://nl.wikipedia.org/wiki/Burgerservicenummer
*
* @param bsn_number social security number to validate (input)
* @return true if validation passed, else false
*/
bool
NL_BSN_check (const char *bsn_number)
{
static const int factors[] = {
9, 8, 7, 6, 5, 4, 3, 2, -1
};
unsigned int sum = 0;
if (strlen (bsn_number) != 9)
return false;
for (unsigned int i = 0; i<8; i++)
{
unsigned char c = (unsigned char) bsn_number[i];
if ( ('0' > c) || ('9' < c) )
return false;
sum += (c - '0') * factors[i];
}
{
unsigned char c = (unsigned char) bsn_number[8];
unsigned int v = (c - '0');
return (sum % 11 == v);
}
}
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