| // Copyright 2018 Google LLC |
| // |
| // 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 random provides functions that generate random numbers or bytes. |
| package random |
| |
| import ( |
| "crypto/rand" |
| "encoding/binary" |
| ) |
| |
| // GetRandomBytes randomly generates n bytes. |
| func GetRandomBytes(n uint32) []byte { |
| buf := make([]byte, n) |
| _, err := rand.Read(buf) |
| if err != nil { |
| panic(err) // out of randomness, should never happen |
| } |
| return buf |
| } |
| |
| // GetRandomUint32 randomly generates an unsigned 32-bit integer. |
| func GetRandomUint32() uint32 { |
| b := GetRandomBytes(4) |
| return binary.BigEndian.Uint32(b) |
| } |
