1// Copyright 2018 Google LLC 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14// 15//////////////////////////////////////////////////////////////////////////////// 16 17// Package random provides functions that generate random numbers or bytes. 18package random 19 20import ( 21 "crypto/rand" 22 "encoding/binary" 23) 24 25// GetRandomBytes randomly generates n bytes. 26func GetRandomBytes(n uint32) []byte { 27 buf := make([]byte, n) 28 _, err := rand.Read(buf) 29 if err != nil { 30 panic(err) // out of randomness, should never happen 31 } 32 return buf 33} 34 35// GetRandomUint32 randomly generates an unsigned 32-bit integer. 36func GetRandomUint32() uint32 { 37 b := GetRandomBytes(4) 38 return binary.BigEndian.Uint32(b) 39} 40