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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.jwk;

import org.jose4j.jwe.JsonWebEncryption;
import org.jose4j.jws.JsonWebSignature;
import org.jose4j.jwx.JsonWebStructure;
import org.jose4j.lang.JoseException;


/**
 *
 */
class SelectorSupport
{
    private static final String[] VERIFY_OPS = new String[] {KeyOperations.VERIFY};
    private static final String[] DECRYPT_OPS = new String[] {KeyOperations.DECRYPT, KeyOperations.DERIVE_KEY, KeyOperations.UNWRAP_KEY};

    public static SimpleJwkFilter filterForInboundSigned(JsonWebSignature jws) throws JoseException
    {
        SimpleJwkFilter filter = commonFilterForInbound(jws);
        filter.setUse(Use.SIGNATURE, SimpleJwkFilter.OMITTED_OKAY);
        filter.setKeyOperations(VERIFY_OPS, SimpleJwkFilter.OMITTED_OKAY);
        return filter;
    }

    public static SimpleJwkFilter filterForInboundEncrypted(JsonWebEncryption jwe) throws JoseException
    {
        SimpleJwkFilter filter = commonFilterForInbound(jwe);
        filter.setUse(Use.ENCRYPTION, SimpleJwkFilter.OMITTED_OKAY);
        filter.setKeyOperations(DECRYPT_OPS, SimpleJwkFilter.OMITTED_OKAY);
        return filter;
    }

    private static SimpleJwkFilter commonFilterForInbound(JsonWebStructure jwx) throws JoseException
    {
        SimpleJwkFilter filter = new SimpleJwkFilter();
        String kid = jwx.getKeyIdHeaderValue();
        if (kid != null)
        {
            filter.setKid(kid, SimpleJwkFilter.VALUE_REQUIRED);
        }

        String x5t = jwx.getX509CertSha1ThumbprintHeaderValue();
        String x5tS256 = jwx.getX509CertSha256ThumbprintHeaderValue();
        filter.setAllowFallbackDeriveFromX5cForX5Thumbs(true);
        if (x5t != null)
        {
            filter.setX5t(x5t, SimpleJwkFilter.OMITTED_OKAY);
        }
        if (x5tS256 != null)
        {
            filter.setX5tS256(x5tS256, SimpleJwkFilter.OMITTED_OKAY);
        }

        String keyType = jwx.getAlgorithmNoConstraintCheck().getKeyType();
        filter.setKty(keyType);

        return filter;
    }


}