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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.keys;

import org.jose4j.lang.StringUtil;

import javax.crypto.spec.SecretKeySpec;

/**
 */
public class PbkdfKey extends SecretKeySpec
{
    public static final String ALGORITHM = "PBKDF2";

    public PbkdfKey(String password)
    {
        super(StringUtil.getBytesUtf8(password), ALGORITHM);
    }

    // todo a char[] version? Like PBEKeySpec and other java stuff does and for the same reasons
    // "Also note that this class stores passwords as char arrays instead of String objects
    // (which would seem more logical), because the String class is immutable and there is no way to
    // overwrite its internal value when the password stored in it is no longer needed. Hence, this
    // class requests the password as a char array, so it can be overwritten when done."
    // -- http://docs.oracle.com/javase/7/docs/api/javax/crypto/spec/PBEKeySpec.html
}