From 89d6b85f1d63b2e59affb27021f8159a7f5a0181 Mon Sep 17 00:00:00 2001
From: Denis Kenzior <denkenz@gmail.com>
Date: Mon, 13 Feb 2017 19:37:10 -0600
Subject: [PATCH] wscutil: Add wsc_is_pin_valid

---
 src/wscutil.c | 16 ++++++++++++++++
 src/wscutil.h |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/src/wscutil.c b/src/wscutil.c
index 3f2133bf..aa55f7e3 100644
--- a/src/wscutil.c
+++ b/src/wscutil.c
@@ -2515,3 +2515,19 @@ bool wsc_kdf(const void *key, void *output, size_t size)
 
 	return true;
 }
+
+bool wsc_pin_is_valid(const char *pin)
+{
+	unsigned int i;
+
+	for (i = 0; pin[i] >= '0' && pin[i] <= '9'; i++)
+		;
+
+	if (pin[i])
+		return false;
+
+	if (i != 8 && i != 4)
+		return false;
+
+	return true;
+}
diff --git a/src/wscutil.h b/src/wscutil.h
index 4958ad29..1d86c0b0 100644
--- a/src/wscutil.h
+++ b/src/wscutil.h
@@ -637,3 +637,5 @@ struct wsc_session_key {
 } __attribute__ ((packed));
 
 bool wsc_kdf(const void *kdk, void *output, size_t size);
+
+bool wsc_pin_is_valid(const char *pin);