[taler-anastasis] branch master updated: draft DNI validation logic

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grothoff pushed a commit to branch master
in repository anastasis.

The following commit(s) were added to refs/heads/master by this push:
     new c291d70  draft DNI validation logic
c291d70 is described below

commit c291d70a2e05409738ae30db468438fffc4e63e2
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Thu Sep 30 15:00:58 2021 +0200

    draft DNI validation logic
---
 src/reducer/validation_ES_DNI.c | 75 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

diff --git a/src/reducer/validation_ES_DNI.c b/src/reducer/validation_ES_DNI.c
new file mode 100644
index 0000000..06bf143
--- /dev/null
+++ b/src/reducer/validation_ES_DNI.c
@@ -0,0 +1,75 @@
+/*
+  This file is part of Anastasis
+  Copyright (C) 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 Affero General Public License for more 
details.
+
+  You should have received a copy of the GNU Affero General Public License 
along with
+  Anastasis; see the file COPYING.GPL.  If not, see 
<http://www.gnu.org/licenses/>
+*/
+/**
+ * @file reducer/validation_ES_DNI.c
+ * @brief validation logic for Spanish Documento Nacional de Identidad 
numbers, and Número de Identificación de Extranjeros
+ * @author Christian Grothoff
+ */
+#include <string.h>
+#include <stdbool.h>
+
+
+/**
+ * Function to validate a Spanish DNI number.
+ *
+ * See https://www.ordenacionjuego.es/en/calculo-digito-control
+ *
+ * @param dni_number number to validate (input)
+ * @return true if validation passed, else false
+ */
+bool
+ES_DNI_check (const char *dni_number)
+{
+  const char map[] = "TRWAGMYFPDXBNJZSQVHLCKE";
+  unsigned int num;
+  char chksum;
+  unsigned int fact;
+  char dummy;
+
+  if (strlen (dni_number) < 8)
+    return false;
+  switch (dni_number[0])
+  {
+  case 'X':
+    fact = 0;
+    dni_number++;
+    break;
+  case 'Y':
+    fact = 10000000;
+    dni_number++;
+    break;
+  case 'Z':
+    fact = 20000000;
+    dni_number++;
+    break;
+  default:
+    fact = 0;
+    /* domestic */
+  }
+
+  if (2 != sscanf (dni_number,
+                   "%7u%c%c"
+                   & num,
+                   &chksum,
+                   &dummy))
+    return false;
+  num += fact;
+  if (map[num % 23] != chksum)
+    return false;
+  if (map[num % 23] != chksum)
+    return false;
+  return true;
+}

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