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911 B
25 lines
911 B
// Copyright 2011 Google Inc. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package uuid |
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// Random returns a Random (Version 4) UUID or panics. |
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// |
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// The strength of the UUIDs is based on the strength of the crypto/rand |
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// package. |
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// |
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// A note about uniqueness derived from from the UUID Wikipedia entry: |
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// |
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// Randomly generated UUIDs have 122 random bits. One's annual risk of being |
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// hit by a meteorite is estimated to be one chance in 17 billion, that |
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// means the probability is about 0.00000000006 (6 × 10−11), |
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// equivalent to the odds of creating a few tens of trillions of UUIDs in a |
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// year and having one duplicate. |
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func NewRandom() UUID { |
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uuid := make([]byte, 16) |
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randomBits([]byte(uuid)) |
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uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4 |
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uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10 |
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return uuid |
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}
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