Hulk did something

[bytom/vapor.git] / vendor / github.com / pborman / uuid / version4.go

diff --git a/vendor/github.com/pborman/uuid/version4.go b/vendor/github.com/pborman/uuid/version4.go
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index 0000000..b3d4a36
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+++ b/vendor/github.com/pborman/uuid/version4.go
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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
+}