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authorale <ale@incal.net>2017-12-18 22:35:16 +0000
committerale <ale@incal.net>2017-12-18 22:35:16 +0000
commit445bf898d2015d1e28e5f01ef07b26be9dd42bf1 (patch)
tree05bae03d8625be5dee79ac408cf96b6ffae97840 /vendor/github.com/pborman/uuid/version4.go
parent394de2d98a9cfde6244620f0b188625b60f68f96 (diff)
downloadcrawl-445bf898d2015d1e28e5f01ef07b26be9dd42bf1.tar.gz
crawl-445bf898d2015d1e28e5f01ef07b26be9dd42bf1.zip
Add vendor deps
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+// Copyright 2011 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package uuid
+
+// Random returns a Random (Version 4) UUID or panics.
+//
+// The strength of the UUIDs is based on the strength of the crypto/rand
+// package.
+//
+// A note about uniqueness derived from from the UUID Wikipedia entry:
+//
+// Randomly generated UUIDs have 122 random bits. One's annual risk of being
+// hit by a meteorite is estimated to be one chance in 17 billion, that
+// means the probability is about 0.00000000006 (6 × 10−11),
+// equivalent to the odds of creating a few tens of trillions of UUIDs in a
+// year and having one duplicate.
+func NewRandom() UUID {
+ uuid := make([]byte, 16)
+ randomBits([]byte(uuid))
+ uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
+ uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
+ return uuid
+}