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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 Lesser 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_DE_SVN.c
* @brief
* @author Christian Grothoff
* @author Dominik Meister
* @author Dennis Neufeld
*/
#include <string.h>
#include <stdbool.h>
/**
* Sum up all digits in @a v and return the result.
*/
static unsigned int
q (unsigned int v)
{
unsigned int r = 0;
while (0 != v)
{
r += v % 10;
v = v / 10;
}
return r;
}
/**
* Function to validate a German Social Security number.
*
* See https://www.financescout24.de/wissen/ratgeber/sozialversicherungsnummer
* and https://de.wikipedia.org/wiki/Versicherungsnummer
* for the structure!
*
* @param ssn_number social security number to validate (input)
* @return true if validation passed, else false
*/
bool
DE_SVN_check (const char *ssn_number)
{
static const unsigned int factors[] = {
2, 1, 2, 5, 7, 1, 2, 1, 2, 1, 2, 1
};
unsigned int sum = 0;
if (strlen (ssn_number) != 12)
return false;
for (unsigned int i = 0; i<8; i++)
{
unsigned char c = (unsigned char) ssn_number[i];
if ( ('0' > c) || ('9' < c) )
return false;
sum += q ((c - '0') * factors[i]);
}
{
unsigned char c = (unsigned char) ssn_number[8];
unsigned int v = (c - 'A' + 1);
if ( ('A' > c) || ('Z' < c) )
return false;
sum += q ((v / 10) * factors[8]);
sum += q ((v % 10) * factors[9]);
}
for (unsigned int i = 9; i<11; i++)
{
unsigned char c = ssn_number[i];
if ( ('0' > c) || ('9' < c) )
return false;
sum += q ((c - '0') * factors[i + 1]);
}
if (ssn_number[11] != '0' + (sum % 10))
return false;
{
unsigned int month = (ssn_number[4] - '0') * 10 + (ssn_number[5] - '0');
if ( (0 == month) ||
(12 < month) )
return false;
}
return true;
}
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