001/*
002 * nimbus-jose-jwt
003 *
004 * Copyright 2012-2016, Connect2id Ltd and contributors.
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.impl;
019
020
021import java.security.NoSuchAlgorithmException;
022import java.security.Provider;
023import javax.crypto.Cipher;
024import javax.crypto.NoSuchPaddingException;
025
026import net.jcip.annotations.ThreadSafe;
027
028
029/**
030 * Helper utilities for instantiating ciphers.
031 *
032 * @author Cedric Staub
033 * @version 2014-01-22
034 */
035@ThreadSafe
036public class CipherHelper {
037
038
039        /**
040         * Instantiates a cipher with an (optional) JCA provider.
041         *
042         * @param name     The name of the cipher. Must not be {@code null}.
043         * @param provider The JCA provider, {@code null} to use the default.
044         *
045         * @return The cipher.
046         *
047         * @throws NoSuchAlgorithmException On unsupported algorithm.
048         * @throws NoSuchPaddingException   On unsupported padding.
049         */
050        public static Cipher getInstance(String name, Provider provider)
051                throws NoSuchAlgorithmException, NoSuchPaddingException {
052
053                if (provider == null) {
054                        return Cipher.getInstance(name);
055                } else {
056                        return Cipher.getInstance(name, provider);
057                }
058        }
059}