From 00dac648aa7dff66566ba7b4546a12d19e2dd171 Mon Sep 17 00:00:00 2001
From: Denis Kenzior <denkenz@gmail.com>
Date: Fri, 26 Aug 2016 11:51:07 -0500
Subject: [PATCH] wscutil: Add wsc_build_nack

---
 src/wscutil.c | 21 +++++++++++++++++++++
 src/wscutil.h |  2 ++
 2 files changed, 23 insertions(+)

diff --git a/src/wscutil.c b/src/wscutil.c
index 3a2b3e8b..58eaf5f4 100644
--- a/src/wscutil.c
+++ b/src/wscutil.c
@@ -1716,7 +1716,28 @@ done:
 
 	ret = wsc_attr_builder_free(builder, false, out_len);
 	return ret;
+}
 
+uint8_t *wsc_build_nack(const struct wsc_nack *nack, size_t *out_len)
+{
+	struct wsc_attr_builder *builder;
+	uint8_t *ret;
+
+	builder = wsc_attr_builder_new(256);
+	build_version(builder, 0x10);
+	build_message_type(builder, WSC_MESSAGE_TYPE_WSC_NACK);
+	build_enrollee_nonce(builder, nack->enrollee_nonce);
+	build_registrar_nonce(builder, nack->registrar_nonce);
+	build_configuration_error(builder, nack->configuration_error);
+
+	if (!nack->version2)
+		goto done;
+
+	START_WFA_VENDOR_EXTENSION();
+
+done:
+	ret = wsc_attr_builder_free(builder, false, out_len);
+	return ret;
 }
 
 bool wsc_uuid_from_addr(const uint8_t addr[], uint8_t *out_uuid)
diff --git a/src/wscutil.h b/src/wscutil.h
index 2cae6694..3bb33226 100644
--- a/src/wscutil.h
+++ b/src/wscutil.h
@@ -479,6 +479,8 @@ uint8_t *wsc_build_m3(const struct wsc_m3 *m3, size_t *out_len);
 uint8_t *wsc_build_m4(const struct wsc_m4 *m4, const uint8_t *encrypted,
 			size_t encrypted_len, size_t *out_len);
 
+uint8_t *wsc_build_nack(const struct wsc_nack *nack, size_t *out_len);
+
 bool wsc_uuid_from_addr(const uint8_t addr[], uint8_t *out_uuid);
 
 struct wsc_session_key {