go/aead/subtle/subtle.go

// Copyright 2020 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 subtle provides subtle implementations of the AEAD primitive.
package subtle

import internalaead "github.com/google/tink/go/internal/aead"

const (
	intSize = 32 << (^uint(0) >> 63) // 32 or 64
	maxInt  = 1<<(intSize-1) - 1
)

// ValidateAESKeySize checks if the given key size is a valid AES key size.
func ValidateAESKeySize(sizeInBytes uint32) error {
	return internalaead.ValidateAESKeySize(sizeInBytes)
}