49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
/*
|
|
Copyright The containerd 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 randutil provides utilities for [cyrpto/rand].
|
|
package randutil
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"math"
|
|
"math/big"
|
|
)
|
|
|
|
// Int63n is similar to [math/rand.Int63n] but uses [crypto/rand.Reader] under the hood.
|
|
func Int63n(n int64) int64 {
|
|
b, err := rand.Int(rand.Reader, big.NewInt(n))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return b.Int64()
|
|
}
|
|
|
|
// Int63 is similar to [math/rand.Int63] but uses [crypto/rand.Reader] under the hood.
|
|
func Int63() int64 {
|
|
return Int63n(math.MaxInt64)
|
|
}
|
|
|
|
// Intn is similar to [math/rand.Intn] but uses [crypto/rand.Reader] under the hood.
|
|
func Intn(n int) int {
|
|
return int(Int63n(int64(n)))
|
|
}
|
|
|
|
// Int is similar to [math/rand.Int] but uses [crypto/rand.Reader] under the hood.
|
|
func Int() int {
|
|
return int(Int63())
|
|
}
|