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Java implementation of the Ethereum protocol adapted to use for Hedera Smart Contract Service

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/*
 * Copyright (c) [2016] [  ]
 * This file is part of the ethereumJ library.
 *
 * The ethereumJ library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * The ethereumJ library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the ethereumJ library. If not, see .
 */
package org.ethereum.crypto.jce;

import org.spongycastle.jcajce.provider.config.ConfigurableProvider;
import org.spongycastle.jce.provider.BouncyCastleProvider;

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

public final class SpongyCastleProvider {

  private static class Holder {
    private static final Provider INSTANCE;
    static{
        Provider p = Security.getProvider("SC");
        
        INSTANCE = (p != null) ? p : new BouncyCastleProvider();
            
        INSTANCE.put("MessageDigest.ETH-KECCAK-256", "org.ethereum.crypto.cryptohash.Keccak256");
        INSTANCE.put("MessageDigest.ETH-KECCAK-512", "org.ethereum.crypto.cryptohash.Keccak512");
    }
  }

  public static Provider getInstance() {
    return Holder.INSTANCE;
  }
}