1*e7b1675dSTing-Kang Chang// Copyright 2022 Google LLC 2*e7b1675dSTing-Kang Chang// 3*e7b1675dSTing-Kang Chang// Licensed under the Apache License, Version 2.0 (the "License"); 4*e7b1675dSTing-Kang Chang// you may not use this file except in compliance with the License. 5*e7b1675dSTing-Kang Chang// You may obtain a copy of the License at 6*e7b1675dSTing-Kang Chang// 7*e7b1675dSTing-Kang Chang// http://www.apache.org/licenses/LICENSE-2.0 8*e7b1675dSTing-Kang Chang// 9*e7b1675dSTing-Kang Chang// Unless required by applicable law or agreed to in writing, software 10*e7b1675dSTing-Kang Chang// distributed under the License is distributed on an "AS IS" BASIS, 11*e7b1675dSTing-Kang Chang// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12*e7b1675dSTing-Kang Chang// See the License for the specific language governing permissions and 13*e7b1675dSTing-Kang Chang// limitations under the License. 14*e7b1675dSTing-Kang Chang// 15*e7b1675dSTing-Kang Chang//////////////////////////////////////////////////////////////////////////////// 16*e7b1675dSTing-Kang Chang 17*e7b1675dSTing-Kang Changpackage keyderivation 18*e7b1675dSTing-Kang Chang 19*e7b1675dSTing-Kang Changimport ( 20*e7b1675dSTing-Kang Chang "github.com/google/tink/go/keyset" 21*e7b1675dSTing-Kang Chang) 22*e7b1675dSTing-Kang Chang 23*e7b1675dSTing-Kang Chang// KeysetDeriver is the interface used to derive new keysets based on an 24*e7b1675dSTing-Kang Chang// additional input, the salt. 25*e7b1675dSTing-Kang Chang// 26*e7b1675dSTing-Kang Chang// The salt is used to create the keyset using a pseudorandom function. 27*e7b1675dSTing-Kang Chang// Implementations must be indistinguishable from ideal KeysetDerivers, which, 28*e7b1675dSTing-Kang Chang// for every salt, generates a new random keyset and caches it. 29*e7b1675dSTing-Kang Changtype KeysetDeriver interface { 30*e7b1675dSTing-Kang Chang DeriveKeyset(salt []byte) (*keyset.Handle, error) 31*e7b1675dSTing-Kang Chang} 32