001/* 002 * nimbus-jose-jwt 003 * 004 * Copyright 2012-2016, Connect2id Ltd. 005 * 006 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use 007 * this file except in compliance with the License. You may obtain a copy of the 008 * License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software distributed 013 * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 014 * CONDITIONS OF ANY KIND, either express or implied. See the License for the 015 * specific language governing permissions and limitations under the License. 016 */ 017 018package com.nimbusds.jose.crypto.bc; 019 020 021import org.bouncycastle.jce.provider.BouncyCastleProvider; 022 023 024/** 025 * BouncyCastle JCA provider singleton, intended to prevent memory leaks by 026 * ensuring a single instance is loaded at all times. Application code that 027 * needs a BouncyCastle JCA provider should use the {@link #getInstance()} 028 * method to obtain an instance. 029 * 030 * <p>Requires the following optional dependency: 031 * 032 * <pre> 033 * <dependency> 034 * <groupId>org.bouncycastle</groupId> 035 * <artifactId>bcprov-jdk15on</artifactId> 036 * <version>[1.68,2.0.0)</version> 037 * <optional>true</optional> 038 * </dependency> 039 * </pre> 040 * 041 * <p><strong>Important:</strong> The BouncyCastle FIPS JCA provider dependency 042 * must not be present to prevent class conflicts! 043 * 044 * @author Vladimir Dzhuvinov 045 */ 046public final class BouncyCastleProviderSingleton { 047 048 049 /** 050 * The BouncyCastle provider, lazily instantiated. 051 */ 052 private static BouncyCastleProvider bouncyCastleProvider; 053 054 055 /** 056 * Prevents external instantiation. 057 */ 058 private BouncyCastleProviderSingleton() { } 059 060 061 /** 062 * Returns a BouncyCastle JCA provider instance. 063 * 064 * @return The BouncyCastle JCA provider instance. 065 */ 066 public static BouncyCastleProvider getInstance() { 067 068 if (bouncyCastleProvider == null) { 069 bouncyCastleProvider = new BouncyCastleProvider(); 070 } 071 return bouncyCastleProvider; 072 } 073}