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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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package org.openjdk.bench.javax.crypto.full;

import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.Param;

import org.openjdk.jmh.annotations.Setup;

import java.security.NoSuchAlgorithmException;

import java.security.Provider;

import java.security.SecureRandom;

public class SecureRandomBench extends CryptoBase {

    @Param({"NativePRNG", "SHA1PRNG"})

    private String algorithm;

    @Param({"64"})

    int dataSize;

    @Param({"true", "false"})

    // if shared - use the single SecureRandom instance for all threads

    // otherwise - each thread uses its own SecureRandom instance

    boolean shared;

    private byte[] bytes;

    private SecureRandom rnd;

    private static SecureRandom sharedRnd;

    private static synchronized SecureRandom getSharedInstance(String algorithm, Provider prov) throws NoSuchAlgorithmException {

        if (sharedRnd == null) {

            sharedRnd = (prov == null) ? SecureRandom.getInstance(algorithm) : SecureRandom.getInstance(algorithm, prov);

        }

        return sharedRnd;

    }

    @Setup

    public void setup() throws NoSuchAlgorithmException {

        setupProvider();

        bytes = new byte[dataSize];

        if (shared) {

            rnd = getSharedInstance(algorithm, prov);

        } else {

            rnd = (prov == null) ? SecureRandom.getInstance(algorithm) : SecureRandom.getInstance(algorithm, prov);

        }

    }

    @Benchmark

    public byte[] nextBytes() {

        rnd.nextBytes(bytes);

        return bytes;

    }

}