1 /* 2 * Copyright (C) 2019 The Android Open Source Project 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 17 package com.android.internal.net.ipsec.ike.crypto; 18 19 /** 20 * IkeCrypto is an abstract class that represents common information for all negotiated 21 * cryptographic algorithms that are used to build IKE SA and protect IKE message. 22 */ 23 abstract class IkeCrypto { 24 private final int mAlgorithmId; 25 private final int mKeyLength; 26 private final String mAlgorithmName; 27 28 // IKE crypto algorithm that is not supported by Java Cryptography Extension(JCE) 29 protected static final String ALGO_NAME_JCE_UNSUPPORTED = "ALGO_NAME_JCE_UNSUPPORTED"; 30 IkeCrypto(int algorithmId, int keyLength, String algorithmName)31 protected IkeCrypto(int algorithmId, int keyLength, String algorithmName) { 32 mAlgorithmId = algorithmId; 33 mKeyLength = keyLength; 34 mAlgorithmName = algorithmName; 35 } 36 getAlgorithmId()37 protected int getAlgorithmId() { 38 return mAlgorithmId; 39 } 40 getAlgorithmName()41 protected String getAlgorithmName() { 42 return mAlgorithmName; 43 } 44 45 /** 46 * Gets key length of this algorithm (in bytes). 47 * 48 * @return the key length (in bytes). 49 */ getKeyLength()50 public int getKeyLength() { 51 return mKeyLength; 52 } 53 54 /** 55 * Returns algorithm type as a String. 56 * 57 * @return the algorithm type as a String. 58 */ getTypeString()59 public abstract String getTypeString(); 60 } 61