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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.lang;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;

/**
 *
 */
public class HashUtil
{
    public static final String SHA_256 = "SHA-256";

    public static MessageDigest getMessageDigest(String alg)
    {
        return getMessageDigest(alg, null);
    }

    public static MessageDigest getMessageDigest(String alg, String provider)
    {
        try
        {
            return provider == null ? MessageDigest.getInstance(alg) : MessageDigest.getInstance(alg, provider);
        }
        catch (NoSuchAlgorithmException e)
        {
            throw new UncheckedJoseException("Unable to get MessageDigest instance with " + alg);
        }
        catch (NoSuchProviderException e)
        {
            throw new UncheckedJoseException("Unable to get a MessageDigest implementation of algorithm name: " + alg + " using provider " + provider, e);
        }
    }
}