1// Copyright 2022 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 aead provides internal implementations of the AEAD primitive. 18package aead 19 20import "fmt" 21 22const ( 23 // AESGCMIVSize is the acceptable IV size defined by RFC 5116. 24 AESGCMIVSize = 12 25 // AESGCMTagSize is the acceptable tag size defined by RFC 5116. 26 AESGCMTagSize = 16 27) 28 29// ValidateAESKeySize checks if the given key size is a valid AES key size. 30func ValidateAESKeySize(sizeInBytes uint32) error { 31 switch sizeInBytes { 32 case 16, 32: 33 return nil 34 default: 35 return fmt.Errorf("invalid AES key size; want 16 or 32, got %d", sizeInBytes) 36 } 37} 38