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// Copyright 2020 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build plan9 || windows
// +build plan9 windows
package rand
import (
"context"
"crypto/rand"
)
var defaultContextReader = &cryptoRandReader{}
type cryptoRandReader struct{}
// ReadContext implements a cancelable read.
func (r *cryptoRandReader) ReadContext(ctx context.Context, b []byte) (n int, err error) {
ch := make(chan struct{})
go func() {
n, err = rand.Reader.Read(b)
close(ch)
}()
select {
case <-ctx.Done():
return 0, ctx.Err()
case <-ch:
return n, err
}
}
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