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This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).

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package org.bouncycastle.jcajce.util;

import java.security.Provider;
import java.security.Security;

import org.bouncycastle.jce.provider.BouncyCastleProvider;

/**
 * A JCA/JCE helper that refers to the BC provider for all it's needs.
 */
public class BCJcaJceHelper
    extends ProviderJcaJceHelper
{
    private static volatile Provider bcProvider;

    private static Provider getBouncyCastleProvider()
    {
        if (Security.getProvider("BC") != null)
        {
            return Security.getProvider("BC");
        }
        else if (bcProvider != null)
        {
            return bcProvider;
        }
        else
        {
            bcProvider = new BouncyCastleProvider();

            return bcProvider;
        }
    }

    public BCJcaJceHelper()
    {
        super(getBouncyCastleProvider());
    }
}