From 18d7ebb1b74e81c5ccf750dda4cfe5c0c268f88d Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 27 Feb 2022 15:57:07 +0100
Subject: add support for NL

---
 src/reducer/Makefile.am         |  1 +
 src/reducer/validation_NL_BSN.c | 57 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)
 create mode 100644 src/reducer/validation_NL_BSN.c

(limited to 'src/reducer')

diff --git a/src/reducer/Makefile.am b/src/reducer/Makefile.am
index 7aa389e..bfdb521 100644
--- a/src/reducer/Makefile.am
+++ b/src/reducer/Makefile.am
@@ -26,6 +26,7 @@ libanastasisredux_la_SOURCES = \
   validation_ES_DNI.c \
   validation_IN_AADHAR.c \
   validation_IT_CF.c \
+  validation_NL_BSN.c \
   validation_XX_SQUARE.c \
   validation_XY_PRIME.c
 libanastasisredux_la_LIBADD = \
diff --git a/src/reducer/validation_NL_BSN.c b/src/reducer/validation_NL_BSN.c
new file mode 100644
index 0000000..f92bb38
--- /dev/null
+++ b/src/reducer/validation_NL_BSN.c
@@ -0,0 +1,57 @@
+/*
+  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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