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The jose.4.j library is a robust and easy to use open source implementation of JSON Web Token (JWT) and the JOSE specification suite (JWS, JWE, and JWK). It is written in Java and relies solely on the JCA APIs for cryptography. Please see https://bitbucket.org/b_c/jose4j/wiki/Home for more info, examples, etc..

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/*
 * Copyright 2012-2017 Brian Campbell
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jose4j.jwa;

import org.jose4j.lang.InvalidAlgorithmException;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import static org.jose4j.jwa.AlgorithmConstraints.ConstraintType.BLACKLIST;
import static org.jose4j.jwa.AlgorithmConstraints.ConstraintType.WHITELIST;
import static org.jose4j.jws.AlgorithmIdentifiers.NONE;

/**
 */
public class AlgorithmConstraints
{
    public static final AlgorithmConstraints NO_CONSTRAINTS = new AlgorithmConstraints(ConstraintType.BLACKLIST);
    public static final AlgorithmConstraints DISALLOW_NONE = new AlgorithmConstraints(BLACKLIST, NONE);
    public static final AlgorithmConstraints ALLOW_ONLY_NONE = new AlgorithmConstraints(WHITELIST, NONE);

    public enum ConstraintType {WHITELIST, BLACKLIST}

    private final ConstraintType type;
    private final Set algorithms;

    public AlgorithmConstraints(ConstraintType type, String... algorithms)
    {
        if (type == null)
        {
            throw new NullPointerException("ConstraintType cannot be null");
        }
        this.type = type;
        this.algorithms = new HashSet<>(Arrays.asList(algorithms));
    }

    public void checkConstraint(String algorithm) throws InvalidAlgorithmException
    {
        switch (type)
        {
            case WHITELIST:
                if (!algorithms.contains(algorithm))
                {
                    throw new InvalidAlgorithmException("'" +algorithm + "' is not a whitelisted algorithm.");
                }
                break;
            case BLACKLIST:
                if (algorithms.contains(algorithm))
                {
                    throw new InvalidAlgorithmException("'" + algorithm + "' is a blacklisted algorithm.");
                }
                break;
        }
    }
}