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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.digests.NonMemoableDigest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.test.SimpleTestResult;
import org.bouncycastle.util.test.Test;
import org.bouncycastle.util.test.TestResult;

/**
 * SHA1 HMac Test, test vectors from RFC 2202
 */
public class NonMemoableDigestTest
    implements Test
{
    final static String[] keys = {
        "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b",
        "4a656665",
        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
        "0102030405060708090a0b0c0d0e0f10111213141516171819",
        "0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c",
        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
        "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
    };

    final static String[] digests = {
        "b617318655057264e28bc0b6fb378c8ef146be00",
        "effcdf6ae5eb2fa2d27416d5f184df9c259a7c79",
        "125d7342b9ac11cd91a39af48aa17b4f63f175d3",
        "4c9007f4026250c6bc8414f9bf50c86c2d7235da",
        "4c1a03424b55e07fe7f27be1d58bb9324a9a5a04",
        "aa4ae5e15272d00e95705637ce8a3b55ed402112",
        "e8e99d0f45237d786d6bbaa7965c7808bbff1a91",
        "4c1a03424b55e07fe7f27be1d58bb9324a9a5a04",
        "aa4ae5e15272d00e95705637ce8a3b55ed402112",
        "e8e99d0f45237d786d6bbaa7965c7808bbff1a91"
    };

    final static String[] messages = {
        "Hi There",
        "what do ya want for nothing?",
        "0xdddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd",
        "0xcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcdcd",
        "Test With Truncation",
        "Test Using Larger Than Block-Size Key - Hash Key First",
        "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"
    };
        
    public String getName()
    {
        return "NonMemoableDigest";
    }

    public TestResult perform()
    {
        HMac hmac = new HMac(new NonMemoableDigest(new SHA1Digest()));
        byte[] resBuf = new byte[hmac.getMacSize()];

        for (int i = 0; i < messages.length; i++)
        {
            byte[] m = Strings.toByteArray(messages[i]);
            if (messages[i].startsWith("0x"))
            {
                m = Hex.decode(messages[i].substring(2));
            }
            hmac.init(new KeyParameter(Hex.decode(keys[i])));
            hmac.update(m, 0, m.length);
            hmac.doFinal(resBuf, 0);

            if (!Arrays.areEqual(resBuf, Hex.decode(digests[i])))
            {
                return new SimpleTestResult(false, getName() + ": Vector " + i + " failed");
            }
        }

        //
        // test reset
        //
        int vector = 0; // vector used for test
        byte[] m = Strings.toByteArray(messages[vector]);
        if (messages[vector].startsWith("0x"))
        {
            m = Hex.decode(messages[vector].substring(2));
        }
        hmac.init(new KeyParameter(Hex.decode(keys[vector])));
        hmac.update(m, 0, m.length);
        hmac.doFinal(resBuf, 0);
        hmac.reset();
        hmac.update(m, 0, m.length);
        hmac.doFinal(resBuf, 0);

        if (!Arrays.areEqual(resBuf, Hex.decode(digests[vector])))
        {
            return new SimpleTestResult(false, getName() +
                    ": Reset with vector " + vector + " failed");
        }

        return new SimpleTestResult(true, getName() + ": Okay");
    }

    public static void main(
        String[]    args)
    {
        NonMemoableDigestTest test = new NonMemoableDigestTest();
        TestResult      result = test.perform();

        System.out.println(result);
    }
}