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// Copyright 2018 Google Inc.
//
// 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 rand implements a cryptographically secure pseudorandom number
// generator.
package rand
import (
"io"
"golang.org/x/sys/unix"
)
// reader implements an io.Reader that returns pseudorandom bytes.
type reader struct{}
// Read implements io.Reader.Read.
func (reader) Read(p []byte) (int, error) {
return unix.Getrandom(p, 0)
}
// Reader is the default reader.
var Reader io.Reader = reader{}
// Read reads from the default reader.
func Read(b []byte) (int, error) {
return io.ReadFull(Reader, b)
}
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