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49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package randutil provides utilities for [cyrpto/rand].
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package randutil
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import (
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"crypto/rand"
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"math"
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"math/big"
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)
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// Int63n is similar to [math/rand.Int63n] but uses [crypto/rand.Reader] under the hood.
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func Int63n(n int64) int64 {
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b, err := rand.Int(rand.Reader, big.NewInt(n))
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if err != nil {
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panic(err)
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}
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return b.Int64()
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}
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// Int63 is similar to [math/rand.Int63] but uses [crypto/rand.Reader] under the hood.
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func Int63() int64 {
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return Int63n(math.MaxInt64)
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}
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// Intn is similar to [math/rand.Intn] but uses [crypto/rand.Reader] under the hood.
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func Intn(n int) int {
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return int(Int63n(int64(n)))
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}
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// Int is similar to [math/rand.Int] but uses [crypto/rand.Reader] under the hood.
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func Int() int {
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return int(Int63())
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}
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