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Code Editor : randutil.go
// Copyright 2018 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Package randutil contains internal randomness utilities for various // crypto packages. package randutil import ( "io" "sync" ) var ( closedChanOnce sync.Once closedChan chan struct{} ) // MaybeReadByte reads a single byte from r with ~50% probability. This is used // to ensure that callers do not depend on non-guaranteed behaviour, e.g. // assuming that rsa.GenerateKey is deterministic w.r.t. a given random stream. // // This does not affect tests that pass a stream of fixed bytes as the random // source (e.g. a zeroReader). func MaybeReadByte(r io.Reader) { closedChanOnce.Do(func() { closedChan = make(chan struct{}) close(closedChan) }) select { case <-closedChan: return case <-closedChan: var buf [1]byte r.Read(buf[:]) } }
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