-
Notifications
You must be signed in to change notification settings - Fork 0
/
seed.go
34 lines (31 loc) · 1.11 KB
/
seed.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
// Copyright 2017 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mathrand
import (
cryptorand "crypto/rand"
"encoding/binary"
"math/rand"
)
// SeedRandomly seeds global math/rand RNG with bytes from crypto-random source.
//
// It is a good idea to call this in main() of some process to guarantee that
// multiple instances of this process don't go through the exact same PRNG
// sequence (go runtime doesn't seed math/rand itself).
func SeedRandomly() {
var seed int64
if err := binary.Read(cryptorand.Reader, binary.LittleEndian, &seed); err != nil {
panic(err)
}
rand.Seed(seed)
}