From 9f7a6d50b4c6a79ab16dfabe2c57510565bc4cf2 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Thu, 30 Dec 2021 00:06:02 +0100
Subject: simplify pin entry by breaking up into groups and auto-completion
 (#7088)

---
 src/util/Makefile.am |  3 +-
 src/util/pin.c       | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+), 1 deletion(-)
 create mode 100644 src/util/pin.c

(limited to 'src/util')

diff --git a/src/util/Makefile.am b/src/util/Makefile.am
index 22c7a1c..4e64c0e 100644
--- a/src/util/Makefile.am
+++ b/src/util/Makefile.am
@@ -34,7 +34,8 @@ lib_LTLIBRARIES = \
 
 libanastasisutil_la_SOURCES = \
   anastasis_crypto.c \
-  os_installation.c
+  os_installation.c \
+  pin.c
 libanastasisutil_la_LIBADD = \
   -lgnunetutil \
   $(LIBGCRYPT_LIBS) \
diff --git a/src/util/pin.c b/src/util/pin.c
new file mode 100644
index 0000000..0285bb0
--- /dev/null
+++ b/src/util/pin.c
@@ -0,0 +1,84 @@
+/*
+     This file is part of GNU Anastasis.
+     Copyright (C) 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.  If not, write to the
+     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+     Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @file anastasis/src/util/pin.c
+ * @brief pin conversion functions
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "anastasis_util_lib.h"
+
+
+bool
+ANASTASIS_scan_pin (const char *as,
+                    unsigned long long *pin)
+{
+  char dummy;
+  char s[16];
+
+  if ( (NULL != as) &&
+       (0 == strncasecmp ("A-", as, 2)) )
+    as += 2; /* skip "A-" prefix if present */
+  if (strlen (as) != 18)
+    return false;
+  if ( ('-' != as[5]) ||
+       ('-' != as[9]) ||
+       ('-' != as[14]) )
+    return false;
+  GNUNET_snprintf (s,
+                   sizeof (s),
+                   "%.5s%.3s%.4s%.3s",
+                   as,
+                   &as[6],
+                   &as[10],
+                   &as[15]);
+  if (1 != sscanf (s,
+                   "%llu%c",
+                   pin,
+                   &dummy))
+  {
+    GNUNET_break (0);
+    return false;
+  }
+  return true;
+}
+
+
+const char *
+ANASTASIS_pin2s (uint64_t pin)
+{
+  static char buf[22];
+  char tmp[16];
+
+  GNUNET_assert (pin < ANASTASIS_PIN_MAX_VALUE);
+  GNUNET_snprintf (tmp,
+                   sizeof (tmp),
+                   "%015llu",
+                   (unsigned long long) pin);
+  GNUNET_snprintf (buf,
+                   sizeof (buf),
+                   "A-%.5s-%.3s-%.4s-%.3s",
+                   tmp,
+                   &tmp[5],
+                   &tmp[8],
+                   &tmp[12]);
+  return buf;
+}
-- 
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