From 6d88c555019f32509f303e23dcfbba824fecd2ee Mon Sep 17 00:00:00 2001
From: Chris Hiszpanski <chris@hiszpanski.name>
Date: Thu, 18 Apr 2019 00:55:30 -0700
Subject: Initial public commit.

mDNS and SDP are functional. Otherwise, library is still very much
a work in progress. All tests pass.
---
 src/uuid.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/uuid.c

(limited to 'src/uuid.c')

diff --git a/src/uuid.c b/src/uuid.c
new file mode 100644
index 0000000..6dfa4c1
--- /dev/null
+++ b/src/uuid.c
@@ -0,0 +1,76 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * Pseudo-random univerally-unique identifier generator [^RFC4122].
+ *
+ * [^RFC4122]: https://tools.ietf.org/html/rfc4122#section-4.4
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "prng.h"
+#include "uuid.h"
+
+/**
+ * Generate a pseudo-random UUID.
+ *
+ * \return Populated UUID.
+ */
+struct uuid uuid_create() {
+	struct uuid u;
+
+	// fill with randomness
+	prng(&u, sizeof(u));
+
+	// set reserved and version bits
+	u.clk_seq_hi_and_reserved = (u.clk_seq_hi_and_reserved & 0x3F) | 0x80;
+	u.time_hi_and_version = (u.time_hi_and_version & 0x0FFF) | 0x4000;
+
+	return u;
+}
+
+/**
+ * Generate pseudorandom UUID (as a string)
+ *
+ * \param s Destination string memory.
+ *
+ */
+void uuid_create_str(char s[UUID_STR_LEN]) {
+	struct uuid u = uuid_create();
+
+	sprintf(s, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+		u.time_low,
+		u.time_mid,
+		u.time_hi_and_version,
+		u.clk_seq_hi_and_reserved,
+		u.clk_seq_low,
+		u.node[0],
+		u.node[1],
+		u.node[2],
+		u.node[3],
+		u.node[4],
+		u.node[5]
+	);
+}
-- 
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