http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
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package org.bouncycastle.crypto.test;

import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA512tDigest;


standard vector test for SHA-512/224 from FIPS 180-4.
Note, only the last 2 message entries are FIPS originated..

/**
 * standard vector test for SHA-512/224 from FIPS 180-4.
 *
 * Note, only the last 2 message entries are FIPS originated..
 */
public class SHA512t224DigestTest
    extends DigestTest
{
    private static String[] messages =
    {
        "",
        "a",
        "abc",
        "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu"
    };

    private static String[] digests =
    {
        "6ed0dd02806fa89e25de060c19d3ac86cabb87d6a0ddd05c333b84f4",
        "d5cdb9ccc769a5121d4175f2bfdd13d6310e0d3d361ea75d82108327",
        "4634270F707B6A54DAAE7530460842E20E37ED265CEEE9A43E8924AA",
        "23FEC5BB94D60B23308192640B0C453335D664734FE40E7268674AF9"
    };

    // 1 million 'a'
    static private String  million_a_digest = "37ab331d76f0d36de422bd0edeb22a28accd487b7a8453ae965dd287";

    SHA512t224DigestTest()
    {
        super(new SHA512tDigest(224), messages, digests);
    }

    public void performTest()
    {
        super.performTest();

        millionATest(million_a_digest);
    }

    protected Digest cloneDigest(Digest digest)
    {
        return new SHA512tDigest((SHA512tDigest)digest);
    }

    protected Digest cloneDigest(byte[] encodedState)
    {
        return new SHA512tDigest(encodedState);
    }

    public static void main(
        String[]    args)
    {
        runTest(new SHA512t224DigestTest());
    }
}