d8b68e3ccc
From golangci-lint: > SA1019: rand.Read has been deprecated since Go 1.20 because it >shouldn't be used: For almost all use cases, crypto/rand.Read is more >appropriate. (staticcheck) > SA1019: rand.Seed has been deprecated since Go 1.20 and an alternative >has been available since Go 1.0: Programs that call Seed and then expect >a specific sequence of results from the global random source (using >functions such as Int) can be broken when a dependency changes how >much it consumes from the global random source. To avoid such breakages, >programs that need a specific result sequence should use >NewRand(NewSource(seed)) to obtain a random generator that other >packages cannot access. (staticcheck) See also: - https://pkg.go.dev/math/rand@go1.20#Read - https://pkg.go.dev/math/rand@go1.20#Seed Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
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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