1 /* 2 * Copyright © 2015-2018 Aeneas Rekkas <aeneas+oss@aeneas.io> 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 * 16 * @author Aeneas Rekkas <aeneas+oss@aeneas.io> 17 * @copyright 2015-2018 Aeneas Rekkas <aeneas+oss@aeneas.io> 18 * @license Apache-2.0 19 * 20 */ 21 22 package hmac 23 24 import ( 25 "crypto/rand" 26 "io" 27 28 "github.com/ory/x/errorsx" 29 ) 30 31 // RandomBytes returns n random bytes by reading from crypto/rand.Reader 32 func RandomBytes(n int) ([]byte, error) { 33 bytes := make([]byte, n) 34 if _, err := io.ReadFull(rand.Reader, bytes); err != nil { 35 return []byte{}, errorsx.WithStack(err) 36 } 37 return bytes, nil 38 } 39