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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.jcajce.util;

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

import org.spongycastle.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("SC") != null)
        {
            return Security.getProvider("SC");
        }
        else if (bcProvider != null)
        {
            return bcProvider;
        }
        else
        {
            bcProvider = new BouncyCastleProvider();

            return bcProvider;
        }
    }

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