ducky/devices
2016-01-02
Parent:a700ede02f91
ducky/devices/vendor/github.com/pborman/uuid/version4.go
Update trout to fix routing bug. Update to tip on trout to fix the routing bug that was causing us such issues. See the commit message of trout at 3df515f0cec5 for more details.
| paddy@0 | 1 // Copyright 2011 Google Inc. All rights reserved. |
| paddy@0 | 2 // Use of this source code is governed by a BSD-style |
| paddy@0 | 3 // license that can be found in the LICENSE file. |
| paddy@0 | 4 |
| paddy@0 | 5 package uuid |
| paddy@0 | 6 |
| paddy@0 | 7 // Random returns a Random (Version 4) UUID or panics. |
| paddy@0 | 8 // |
| paddy@0 | 9 // The strength of the UUIDs is based on the strength of the crypto/rand |
| paddy@0 | 10 // package. |
| paddy@0 | 11 // |
| paddy@0 | 12 // A note about uniqueness derived from from the UUID Wikipedia entry: |
| paddy@0 | 13 // |
| paddy@0 | 14 // Randomly generated UUIDs have 122 random bits. One's annual risk of being |
| paddy@0 | 15 // hit by a meteorite is estimated to be one chance in 17 billion, that |
| paddy@0 | 16 // means the probability is about 0.00000000006 (6 × 10−11), |
| paddy@0 | 17 // equivalent to the odds of creating a few tens of trillions of UUIDs in a |
| paddy@0 | 18 // year and having one duplicate. |
| paddy@0 | 19 func NewRandom() UUID { |
| paddy@0 | 20 uuid := make([]byte, 16) |
| paddy@0 | 21 randomBits([]byte(uuid)) |
| paddy@0 | 22 uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4 |
| paddy@0 | 23 uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10 |
| paddy@0 | 24 return uuid |
| paddy@0 | 25 } |