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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.crypto.test;

import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA512Digest;


standard vector test for SHA-512 from FIPS Draft 180-2.
Note, the first two vectors are _not_ from the draft, the last three are.

/**
 * standard vector test for SHA-512 from FIPS Draft 180-2.
 *
 * Note, the first two vectors are _not_ from the draft, the last three are.
 */
public class SHA512DigestTest
    extends DigestTest
{
    private static String[] messages =
    {
        "",
        "a",
        "abc",
        "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu"
    };

    private static String[] digests =
    {
        "cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e",
        "1f40fc92da241694750979ee6cf582f2d5d7d28e18335de05abc54d0560e0f5302860c652bf08d560252aa5e74210546f369fbbbce8c12cfc7957b2652fe9a75",
        "ddaf35a193617abacc417349ae20413112e6fa4e89a97ea20a9eeee64b55d39a2192992a274fc1a836ba3c23a3feebbd454d4423643ce80e2a9ac94fa54ca49f",
        "8e959b75dae313da8cf4f72814fc143f8f7779c6eb9f7fa17299aeadb6889018501d289e4900f7e4331b99dec4b5433ac7d329eeb6dd26545e96e55b874be909"
    };

    // 1 million 'a'
    static private String  million_a_digest = "e718483d0ce769644e2e42c7bc15b4638e1f98b13b2044285632a803afa973ebde0ff244877ea60a4cb0432ce577c31beb009c5c2c49aa2e4eadb217ad8cc09b";

    SHA512DigestTest()
    {
        super(new SHA512Digest(), messages, digests);
    }

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

        millionATest(million_a_digest);
    }

    protected Digest cloneDigest(Digest digest)
    {
        return new SHA512Digest((SHA512Digest)digest);
    }

    protected Digest cloneDigest(byte[] encodedState)
    {
        return new SHA512Digest(encodedState);
    }

    public static void main(
        String[]    args)
    {
        runTest(new SHA512DigestTest());
    }
}