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This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).
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package org.bouncycastle.crypto.test;

import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.Mac;
import org.bouncycastle.crypto.digests.KeccakDigest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.test.SimpleTest;

/**
 * Keccak Digest Test
 */
public class KeccakDigestTest
    extends SimpleTest
{
    final static String[] messages = {
        "",
        "54686520717569636b2062726f776e20666f78206a756d7073206f76657220746865206c617a7920646f67",
        "54686520717569636b2062726f776e20666f78206a756d7073206f76657220746865206c617a7920646f672e"
    };

    final static String[] digests288 = { // the default settings
        "6753e3380c09e385d0339eb6b050a68f66cfd60a73476e6fd6adeb72f5edd7c6f04a5d01",  // message[0]    
        "0bbe6afae0d7e89054085c1cc47b1689772c89a41796891e197d1ca1b76f288154933ded",  // message[1]
        "82558a209b960ddeb531e6dcb281885b2400ca160472462486e79f071e88a3330a8a303d",  // message[2]
        "94049e1ad7ef5d5b0df2b880489e7ab09ec937c3bfc1b04470e503e1ac7b1133c18f86da",  // 64k a-test
        "a9cb5a75b5b81b7528301e72553ed6770214fa963956e790528afe420de33c074e6f4220",  // random alphabet test
        "eadaf5ba2ad6a2f6f338fce0e1efdad2a61bb38f6be6068b01093977acf99e97a5d5827c"   // extremely long data test
    };

    final static String[] digests224 = {
        "f71837502ba8e10837bdd8d365adb85591895602fc552b48b7390abd",
        "310aee6b30c47350576ac2873fa89fd190cdc488442f3ef654cf23fe",
        "c59d4eaeac728671c635ff645014e2afa935bebffdb5fbd207ffdeab",
        "f621e11c142fbf35fa8c22841c3a812ba1e0151be4f38d80b9f1ff53",
        "68b5fc8c87193155bba68a2485377e809ee4f81a85ef023b9e64add0",
        "c42e4aee858e1a8ad2976896b9d23dd187f64436ee15969afdbc68c5"
    };

    final static String[] digests256 = {
        "c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470",
        "4d741b6f1eb29cb2a9b9911c82f56fa8d73b04959d3d9d222895df6c0b28aa15",
        "578951e24efd62a3d63a86f7cd19aaa53c898fe287d2552133220370240b572d",
        "0047a916daa1f92130d870b542e22d3108444f5a7e4429f05762fb647e6ed9ed",
        "db368762253ede6d4f1db87e0b799b96e554eae005747a2ea687456ca8bcbd03",
        "5f313c39963dcf792b5470d4ade9f3a356a3e4021748690a958372e2b06f82a4"
    };

    final static String[] digests384 = {
        "2c23146a63a29acf99e73b88f8c24eaa7dc60aa771780ccc006afbfa8fe2479b2dd2b21362337441ac12b515911957ff",
        "283990fa9d5fb731d786c5bbee94ea4db4910f18c62c03d173fc0a5e494422e8a0b3da7574dae7fa0baf005e504063b3",
        "9ad8e17325408eddb6edee6147f13856ad819bb7532668b605a24a2d958f88bd5c169e56dc4b2f89ffd325f6006d820b",
        "c704cfe7a1a53208ca9526cd24251e0acdc252ecd978eee05acd16425cfb404ea81f5a9e2e5e97784d63ee6a0618a398",
        "d4fe8586fd8f858dd2e4dee0bafc19b4c12b4e2a856054abc4b14927354931675cdcaf942267f204ea706c19f7beefc4",
        "9b7168b4494a80a86408e6b9dc4e5a1837c85dd8ff452ed410f2832959c08c8c0d040a892eb9a755776372d4a8732315"
    };

    final static String[] digests512 = {
        "0eab42de4c3ceb9235fc91acffe746b29c29a8c366b7c60e4e67c466f36a4304c00fa9caf9d87976ba469bcbe06713b435f091ef2769fb160cdab33d3670680e",
        "d135bb84d0439dbac432247ee573a23ea7d3c9deb2a968eb31d47c4fb45f1ef4422d6c531b5b9bd6f449ebcc449ea94d0a8f05f62130fda612da53c79659f609",
        "ab7192d2b11f51c7dd744e7b3441febf397ca07bf812cceae122ca4ded6387889064f8db9230f173f6d1ab6e24b6e50f065b039f799f5592360a6558eb52d760",
        "34341ead153aa1d1fdcf6cf624c2b4f6894b6fd16dc38bd4ec971ac0385ad54fafcb2e0ed86a1e509456f4246fdcb02c3172824cd649d9ad54c51f7fb49ea67c",
        "dc44d4f4d36b07ab5fc04016cbe53548e5a7778671c58a43cb379fd00c06719b8073141fc22191ffc3db5f8b8983ae8341fa37f18c1c969664393aa5ceade64e",
        "3e122edaf37398231cfaca4c7c216c9d66d5b899ec1d7ac617c40c7261906a45fc01617a021e5da3bd8d4182695b5cb785a28237cbb167590e34718e56d8aab8"
    };

    // test vectors from  http://www.di-mgt.com.au/hmac_sha3_testvectors.html
    final static byte[][] macKeys =
    {
        Hex.decode("0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"),
        Hex.decode("4a656665"),
        Hex.decode("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"),
        Hex.decode("0102030405060708090a0b0c0d0e0f10111213141516171819"),
        Hex.decode("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaa"),
        Hex.decode("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaa"),
        Hex.decode("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" +
                   "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa")
    };

    final static String[] macData =
    {
        "4869205468657265",
        "7768617420646f2079612077616e7420666f72206e6f7468696e673f",
        "dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd" +
            "dddddddddddddddddddddddddddddddddddd",
        "cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd" +
            "cdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd",
        "54657374205573696e67204c6172676572205468616e20426c6f636b2d53697a" +
            "65204b6579202d2048617368204b6579204669727374",
        "5468697320697320612074657374207573696e672061206c6172676572207468" +
            "616e20626c6f636b2d73697a65206b657920616e642061206c61726765722074" +
            "68616e20626c6f636b2d73697a6520646174612e20546865206b6579206e6565" +
            "647320746f20626520686173686564206265666f7265206265696e6720757365" +
            "642062792074686520484d414320616c676f726974686d2e",
        "5468697320697320612074657374207573696e672061206c6172676572207468" +
            "616e20626c6f636b2d73697a65206b657920616e642061206c61726765722074" +
            "68616e20626c6f636b2d73697a6520646174612e20546865206b6579206e6565" +
            "647320746f20626520686173686564206265666f7265206265696e6720757365\n" +
            "642062792074686520484d414320616c676f726974686d2e"
    };

    final static String[] mac224 =
    {
        "b73d595a2ba9af815e9f2b4e53e78581ebd34a80b3bbaac4e702c4cc",
        "e824fec96c074f22f99235bb942da1982664ab692ca8501053cbd414",
        "770df38c99d6e2bacd68056dcfe07d4c89ae20b2686a6185e1faa449",
        "305a8f2dfb94bad28861a03cbc4d590febe775c58cb4961c28428a0b",
        "e7a52dfa45f95a217c100066b239aa8ad519be9b35d667268b1b57ff",
        "ba13009405a929f398b348885caa5419191bb948ada32194afc84104",
        "92649468be236c3c72c189909c063b13f994be05749dc91310db639e"
    };

    final static String[] mac256 =
    {
        "9663d10c73ee294054dc9faf95647cb99731d12210ff7075fb3d3395abfb9821",
        "aa9aed448c7abc8b5e326ffa6a01cdedf7b4b831881468c044ba8dd4566369a1",
        "95f43e50f8df80a21977d51a8db3ba572dcd71db24687e6f86f47c1139b26260",
        "6331ba9b4af5804a68725b3663eb74814494b63c6093e35fb320a85d507936fd",
        "b4d0cdee7ec2ba81a88b86918958312300a15622377929a054a9ce3ae1fac2b6",
        "1fdc8cb4e27d07c10d897dec39c217792a6e64fa9c63a77ce42ad106ef284e02",
        "fdaa10a0299aecff9bb411cf2d7748a4022e4a26be3fb5b11b33d8c2b7ef5484"
    };

    final static String[] mac384 =
    {
        "892dfdf5d51e4679bf320cd16d4c9dc6f749744608e003add7fba894acff87361efa4e5799be06b6461f43b60ae97048",
        "5af5c9a77a23a6a93d80649e562ab77f4f3552e3c5caffd93bdf8b3cfc6920e3023fc26775d9df1f3c94613146ad2c9d",
        "4243c29f2201992ff96441e3b91ff81d8c601d706fbc83252684a4bc51101ca9b2c06ddd03677303c502ac5331752a3c",
        "b730724d3d4090cda1be799f63acbbe389fef7792fc18676fa5453aab398664650ed029c3498bbe8056f06c658e1e693",
        "d62482ef601d7847439b55236e9679388ffcd53c62cd126f39be6ea63de762e26cd5974cb9a8de401b786b5555040f6f",
        "4860ea191ac34994cf88957afe5a836ef36e4cc1a66d75bf77defb7576122d75f60660e4cf731c6effac06402787e2b9",
        "fe9357e3cfa538eb0373a2ce8f1e26ad6590afdaf266f1300522e8896d27e73f654d0631c8fa598d4bb82af6b744f4f5"
    };

    final static String[] mac512 =
    {
        "8852c63be8cfc21541a4ee5e5a9a852fc2f7a9adec2ff3a13718ab4ed81aaea0b87b7eb397323548e261a64e7fc75198f6663a11b22cd957f7c8ec858a1c7755",
        "c2962e5bbe1238007852f79d814dbbecd4682e6f097d37a363587c03bfa2eb0859d8d9c701e04cececfd3dd7bfd438f20b8b648e01bf8c11d26824b96cebbdcb",
        "eb0ed9580e0ec11fc66cbb646b1be904eaff6da4556d9334f65ee4b2c85739157bae9027c51505e49d1bb81cfa55e6822db55262d5a252c088a29a5e95b84a66",
        "b46193bb59f4f696bf702597616da91e2a4558a593f4b015e69141ba81e1e50ea580834c2b87f87baa25a3a03bfc9bb389847f2dc820beae69d30c4bb75369cb",
        "d05888a6ebf8460423ea7bc85ea4ffda847b32df32291d2ce115fd187707325c7ce4f71880d91008084ce24a38795d20e6a28328a0f0712dc38253370da3ebb5",
        "2c6b9748d35c4c8db0b4407dd2ed2381f133bdbd1dfaa69e30051eb6badfcca64299b88ae05fdbd3dd3dd7fe627e42e39e48b0fe8c7f1e85f2dbd52c2d753572",
        "6adc502f14e27812402fc81a807b28bf8a53c87bea7a1df6256bf66f5de1a4cb741407ad15ab8abc136846057f881969fbb159c321c904bfb557b77afb7778c8"
    };

    final static KeyParameter truncKey = new KeyParameter(Hex.decode("0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c"));
    final static byte[]       truncData = Hex.decode("546573742057697468205472756e636174696f6e");

    final static byte[]       trunc224 = Hex.decode("f52bbcfd654264e7133085c5e69b72c3");
    final static byte[]       trunc256 = Hex.decode("745e7e687f8335280d54202ef13cecc6");
    final static byte[]       trunc384 = Hex.decode("fa9aea2bc1e181e47cbb8c3df243814d");
    final static byte[]       trunc512 = Hex.decode("04c929fead434bba190dacfa554ce3f5");

    final static byte[]       xtremeData = Hex.decode("61626364656667686263646566676869636465666768696a6465666768696a6b65666768696a6b6c666768696a6b6c6d6768696a6b6c6d6e68696a6b6c6d6e6f");

    KeccakDigestTest()
    {
    }

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

    private void testDigest(Digest digest, String[] expected)
    {
        byte[] hash = new byte[digest.getDigestSize()];

        for (int i = 0; i != messages.length; i++)
        {
            if (messages.length != 0)
            {
                byte[] data = Hex.decode(messages[i]);

                digest.update(data, 0, data.length);
            }

            digest.doFinal(hash, 0);

            if (!Arrays.areEqual(Hex.decode(expected[i]), hash))
            {
                fail("Keccak mismatch on " + digest.getAlgorithmName() + " index " + i);
            }
        }

        byte[] k64 = new byte[1024 * 64];

        for (int i = 0; i != k64.length; i++)
        {
            k64[i] = (byte)'a';
        }

        digest.update(k64, 0, k64.length);

        digest.doFinal(hash, 0);

        if (!Arrays.areEqual(Hex.decode(expected[messages.length]), hash))
        {
            fail("Keccak mismatch on " + digest.getAlgorithmName() + " 64k a");
        }

        for (int i = 0; i != k64.length; i++)
        {
            digest.update((byte)'a');
        }

        digest.doFinal(hash, 0);

        if (!Arrays.areEqual(Hex.decode(expected[messages.length]), hash))
        {
            fail("Keccak mismatch on " + digest.getAlgorithmName() + " 64k a single");
        }


        for (int i = 0; i != k64.length; i++)
        {
            k64[i] = (byte)('a' + (i % 26));
        }

        digest.update(k64, 0, k64.length);

        digest.doFinal(hash, 0);

        if (!Arrays.areEqual(Hex.decode(expected[messages.length + 1]), hash))
        {
            fail("Keccak mismatch on " + digest.getAlgorithmName() + " 64k alpha");
        }

        for (int i = 0; i != 64; i++)
        {
            digest.update(k64[i * 1024]);
            digest.update(k64, i * 1024 + 1, 1023);
        }

        digest.doFinal(hash, 0);

        if (!Arrays.areEqual(Hex.decode(expected[messages.length + 1]), hash))
        {
            fail("Keccak mismatch on " + digest.getAlgorithmName() + " 64k chunked alpha");
        }

        testDigestDoFinal(digest);
        
        //
        // extremely long data test
        //
//        System.out.println("Starting very long");
//        for (int i = 0; i != 16384; i++)
//        {
//            for (int j = 0; j != 1024; j++)
//            {
//                digest.update(xtremeData, 0, xtremeData.length);
//            }
//        }
//
//        digest.doFinal(hash, 0);
//
//        if (!Arrays.areEqual(Hex.decode(expected[messages.length + 2]), hash))
//        {
//            fail("Keccak mismatch on " + digest.getAlgorithmName() + " extreme data test");
//        }
//        System.out.println("Done");
    }

    private void testDigestDoFinal(Digest digest)
    {
        byte[] hash = new byte[digest.getDigestSize()];
        digest.doFinal(hash, 0);

        for (int i = 0; i <= digest.getDigestSize(); ++i)
        {
            byte[] cmp = new byte[2 * digest.getDigestSize()];
            System.arraycopy(hash, 0, cmp, i, hash.length);

            byte[] buf = new byte[2 * digest.getDigestSize()];
            digest.doFinal(buf, i);

            if (!Arrays.areEqual(cmp, buf))
            {
                fail("Keccak offset doFinal on " + digest.getAlgorithmName());
            }
        }
    }

    private void testMac(Digest digest, byte[][] keys, String[] data, String[] expected, byte[] truncExpected)
    {
        Mac mac = new HMac(digest);

        for (int i = 0; i != keys.length; i++)
        {
            mac.init(new KeyParameter(keys[i]));

            byte[] mData = Hex.decode(data[i]);

            mac.update(mData, 0, mData.length);

            byte[] macV = new byte[mac.getMacSize()];

            mac.doFinal(macV, 0);

            if (!Arrays.areEqual(Hex.decode(expected[i]), macV))
            {
                fail("Keccak HMAC mismatch on " + digest.getAlgorithmName());
            }
        }

        mac = new HMac(digest);

        mac.init(truncKey);

        mac.update(truncData, 0, truncData.length);

        byte[] macV = new byte[mac.getMacSize()];

        mac.doFinal(macV, 0);

        for (int i = 0; i != truncExpected.length; i++)
        {
            if (macV[i] != truncExpected[i])
            {
                fail("mismatch on truncated HMAC for " + digest.getAlgorithmName());
            }
        }
    }

    public void performTest() throws Exception
    {
        testDigest(new KeccakDigest(), digests288);
        testDigest(new KeccakDigest(224), digests224);
        testDigest(new KeccakDigest(256), digests256);
        testDigest(new KeccakDigest(384), digests384);
        testDigest(new KeccakDigest(512), digests512);

        testMac(new KeccakDigest(224), macKeys, macData, mac224, trunc224);
        testMac(new KeccakDigest(256), macKeys, macData, mac256, trunc256);
        testMac(new KeccakDigest(384), macKeys, macData, mac384, trunc384);
        testMac(new KeccakDigest(512), macKeys, macData, mac512, trunc512);
    }

    protected Digest cloneDigest(Digest digest)
    {
        return new KeccakDigest((KeccakDigest)digest);
    }
    
    public static void main(
        String[]    args)
    {
        runTest(new KeccakDigestTest());
    }
}