| // 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) |
| } |