1 // Copyright 2023 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 com.google.crypto.tink.keyderivation; 18 19 import com.google.crypto.tink.Key; 20 21 /** 22 * Represents a function to derive a key. 23 * 24 * <p>Tink Key Derivation is given by the primitive which maps a {@code byte[] salt} to a Keyset. 25 * For each key, a {@link KeyDerivationKey} maps a {@code byte[] salt} to a new "derived" {@code 26 * Key}. For a Keyset containing multiple derivation keys, the derived keyset is obtained by mapping 27 * each key according to this map (for the same {@code byte[] salt}), and inserting them into a new 28 * keyset. 29 */ 30 public abstract class KeyDerivationKey extends Key { 31 @Override getParameters()32 public abstract KeyDerivationParameters getParameters(); 33 } 34