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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.io.UnsupportedEncodingException;
import java.nio.charset.Charset;

/**
 */
public class StringUtil
{
    // not using StandardCharsets due to lack of support in Android until API 19
    public static final String UTF_8 = "UTF-8";
    public static final String US_ASCII = "US-ASCII";

    public static String newStringUtf8(byte[] bytes)
    {
        return newString(bytes, UTF_8);
    }

    public static String newStringUsAscii(byte[] bytes)
    {
        return newString(bytes, US_ASCII);
    }

    public static String newString(byte[] bytes, String charsetName)
    {
        try
        {
            return (bytes == null) ? null : new String(bytes, charsetName);
        }
        catch (UnsupportedEncodingException e)
        {
            throw newISE(charsetName);
        }
    }

    public static String newString(byte[] bytes, Charset charset)
    {
        return (bytes == null) ? null : new String(bytes, charset);
    }

    public static byte[] getBytesUtf8(String string)
    {
        return getBytesUnchecked(string, UTF_8);
    }

    public static byte[] getBytesAscii(String string)
    {
        return getBytesUnchecked(string, US_ASCII);
    }

    public static byte[] getBytes(String string, Charset charset)
    {
        return (string == null) ? null : string.getBytes(charset);
    }

    public static byte[] getBytesUnchecked(String string, String charsetName)
    {
        try
        {
            return (string == null) ? null : string.getBytes(charsetName);
        }
        catch (UnsupportedEncodingException e)
        {
            throw newISE(charsetName);
        }
    }

    private static IllegalStateException newISE(String charsetName)
    {
        return new IllegalStateException("Unknown or unsupported character set name: " + charsetName);
    }
}