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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.InvalidCipherTextException;
import org.bouncycastle.crypto.engines.SerpentEngine;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.modes.EAXBlockCipher;
import org.bouncycastle.crypto.paddings.PKCS7Padding;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.AEADParameters;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.test.SimpleTest;

/**
 * Test vectors based on the NESSIE submission
 */
public class SerpentTest
    extends CipherTest
{
    static SimpleTest[]  tests = 
            {
                new BlockCipherVectorTest(0, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("00000000000000000000000000000000")),
                                    "00000000000000000000000000000000", "3620b17ae6a993d09618b8768266bae9"),
                new BlockCipherVectorTest(1, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("80000000000000000000000000000000")),
                                    "00000000000000000000000000000000", "264E5481EFF42A4606ABDA06C0BFDA3D"),
                new BlockCipherVectorTest(2, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9")),
                                    "D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9D9", "20EA07F19C8E93FDA30F6B822AD5D486"),
                new BlockCipherVectorTest(3, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("000000000000000000000000000000000000000000008000")),
                                   "00000000000000000000000000000000", "40520018C4AC2BBA285AEEB9BCB58755"),
                new BlockCipherVectorTest(4, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("0000000000000000000000000000000000000000000000000000000000000000")),
                                   "00000000000000000000000000000001", "AD86DE83231C3203A86AE33B721EAA9F"),
                new BlockCipherVectorTest(5, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F")),
                                   "3DA46FFA6F4D6F30CD258333E5A61369", "00112233445566778899AABBCCDDEEFF"),
                new BlockCipherVectorTest(6, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("2BD6459F82C5B300952C49104881FF482BD6459F82C5B300952C49104881FF48")),
                                   "677C8DFAA08071743FD2B415D1B28AF2", "EA024714AD5C4D84EA024714AD5C4D84"),
                new BlockCipherVectorTest(7, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("000102030405060708090A0B0C0D0E0F1011121314151617")),
                                   "4528CACCB954D450655E8CFD71CBFAC7", "00112233445566778899AABBCCDDEEFF"),
                new BlockCipherVectorTest(8, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("2BD6459F82C5B300952C49104881FF482BD6459F82C5B300")),
                                   "E0208BE278E21420C4B1B9747788A954", "EA024714AD5C4D84EA024714AD5C4D84"),
                new BlockCipherVectorTest(9, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("000102030405060708090A0B0C0D0E0F")),
                                   "33B3DC87EDDD9B0F6A1F407D14919365", "00112233445566778899AABBCCDDEEFF"),
                new BlockCipherVectorTest(10, new SerpentEngine(),
                                    new KeyParameter(Hex.decode("2BD6459F82C5B300952C49104881FF48")),
                                   "BEB6C069393822D3BE73FF30525EC43E", "EA024714AD5C4D84EA024714AD5C4D84"),
                new BlockCipherMonteCarloTest(20, 100, new SerpentEngine(),
                        new KeyParameter(Hex.decode("F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3")),
                        "F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3F3", "8FD0E58DB7A54B929FCA6A12F96F20AF"),
                new BlockCipherMonteCarloTest(21, 100, new SerpentEngine(),
                         new KeyParameter(Hex.decode("0004000000000000000000000000000000000000000000000000000000000000")),
                         "00000000000000000000000000000000", "E7B681E8871FD05FEAE5FB64DA891EA2"),
                new BlockCipherMonteCarloTest(22, 100, new SerpentEngine(),
                         new KeyParameter(Hex.decode("0000000020000000000000000000000000000000000000000000000000000000")),
                         "00000000000000000000000000000000", "C5545D516EEC73BFA3622A8194F95620"),
                new BlockCipherMonteCarloTest(23, 100, new SerpentEngine(),
                         new KeyParameter(Hex.decode("0000000000000000000000000000000000000000000000000000000002000000")),
                         "00000000000000000000000000000000", "11FF5C9BE006F82C98BD4FAC1A19920E"),
                new BlockCipherMonteCarloTest(24, 100, new SerpentEngine(),
                         new KeyParameter(Hex.decode("0000000000000000000000000000000000000000000000000000000000000000")),
                         "00000000000000000000000000010000", "47CA1CA404B6481CAD4C21C8A0415A0E"),
                new BlockCipherMonteCarloTest(25, 100, new SerpentEngine(),
                          new KeyParameter(Hex.decode("0000000000000000000000000000000000000000000000000000000000000000")),
                          "00000000000000008000000000000000", "A0A2D5B07E27D539CA5BEE9DE1EAB3E6")
            };

    SerpentTest()
    {
        super(tests, new SerpentEngine(), new KeyParameter(new byte[32]));
    }

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

        doCbc(Hex.decode("BE4295539F6BD1752FD0A80229EF8847"), Hex.decode("00963F59224794D5AD4252094358FBC3"), Strings.toByteArray("CBC Mode Test"), Hex.decode("CF2CF2547E02F6D34D97246E8042ED89"));
        doEax(Hex.decode("7494A57648FB420043BFBFC5639EB82D"), Hex.decode("6DF94638B83E01458F3E30C9A1D6AF1C"), Strings.toByteArray("EAX Mode Test"), new byte[0], 128, Hex.decode("96C521F32DC5E9BBC369DDE4914CB13B710EEBBAB7D706D3ABE06A99DC"));
    }

    private void doEax(byte[] key, byte[] iv, byte[] pt, byte[] aad, int tagLength, byte[] expected)
        throws InvalidCipherTextException
    {
        EAXBlockCipher c = new EAXBlockCipher(new SerpentEngine());

        c.init(true, new AEADParameters(new KeyParameter(key), tagLength, iv, aad));

        byte[] out = new byte[expected.length];

        int len = c.processBytes(pt, 0, pt.length, out, 0);

        c.doFinal(out, len);

        if (!Arrays.areEqual(expected, out))
        {
            fail("EAX test failed");
        }
    }

    private void doCbc(byte[] key, byte[] iv, byte[] pt, byte[] expected)
        throws Exception
    {
        PaddedBufferedBlockCipher c = new PaddedBufferedBlockCipher(new CBCBlockCipher(new SerpentEngine()), new PKCS7Padding());

        byte[] ct = new byte[expected.length];

        c.init(true, new ParametersWithIV(new KeyParameter(key), iv));

        int l = c.processBytes(pt, 0, pt.length, ct, 0);

        c.doFinal(ct, l);

        if (!Arrays.areEqual(expected, ct))
        {
            fail("CBC test failed");
        }
    }

    public String getName()
    {
        return "Serpent";
    }

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