Examples of javax.crypto.Mac

javax.crypto.Mac
This class provides the public API for Message Authentication Code (MAC) algorithms.

    {
        try
        {
            SecretKey sk = new SecretKeySpec( key, "AES" );


            Mac mac = Mac.getInstance( "HmacSHA1" );
            mac.init( sk );


            return mac.doFinal( data );
        }
        catch ( GeneralSecurityException nsae )
        {
            nsae.printStackTrace();
            return null;

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    {
        try
        {
            SecretKey sk = new SecretKeySpec( key, "DESede" );


            Mac mac = Mac.getInstance( "HmacSHA1" );
            mac.init( sk );


            return mac.doFinal( data );
        }
        catch ( GeneralSecurityException nsae )
        {
            nsae.printStackTrace();
            return null;

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    {
        try
        {
            SecretKey sk = new SecretKeySpec( key, "ARCFOUR" );


            Mac mac = Mac.getInstance( "HmacMD5" );
            mac.init( sk );


            return mac.doFinal( data );
        }
        catch ( GeneralSecurityException nsae )
        {
            nsae.printStackTrace();
            return null;

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    public byte[] calculateIntegrity( byte[] data, byte[] key, KeyUsage usage )
    {
        try
        {
            Mac digester = Mac.getInstance( "HmacMD5" );
            return digester.doFinal( data );
        }
        catch ( NoSuchAlgorithmException nsae )
        {
            return null;
        }

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    public void testGenerateHmacMd5() throws Exception
    {
        KeyGenerator kg = KeyGenerator.getInstance( "HmacMD5" );
        SecretKey sk = kg.generateKey();


        Mac mac = Mac.getInstance( "HmacMD5" );
        mac.init( sk );
        byte[] result = mac.doFinal( "Hello world!".getBytes() );


        assertEquals( "HmacMD5 size", 16, result.length );
    }

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    public void testGenerateHmacSha1() throws Exception
    {
        KeyGenerator kg = KeyGenerator.getInstance( "HmacSHA1" );
        SecretKey sk = kg.generateKey();


        Mac mac = Mac.getInstance( "HmacSHA1" );
        mac.init( sk );
        byte[] result = mac.doFinal( "Hi There".getBytes() );


        assertEquals( "HmacSHA1 size", 20, result.length );
    }

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        String macAlgorithm = findMacAlgorithm(ctx);
                
        try
        {
            // keep local to avoid threading issue
            Mac mac = Mac.getInstance(macAlgorithm);
            mac.init(macSecretKey);
            Cipher cipher = Cipher.getInstance(algorithm + "/" + algorithmParams);
            if (iv != null)
            {
                IvParameterSpec ivSpec = new IvParameterSpec(iv);
                cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivSpec);
            }
            else
            {
                cipher.init(Cipher.ENCRYPT_MODE, secretKey);
            }
            if (log.isDebugEnabled())
            {
                log.debug("encrypting w/ " + algorithm + "/" + algorithmParams);
            }
            
            //EtM Composition Approach
            int macLenght = mac.getMacLength();
            byte[] secure = new byte[cipher.getOutputSize(insecure.length)+ macLenght];
            int secureCount = cipher.doFinal(insecure,0,insecure.length,secure);
            mac.update(secure, 0, secureCount);
            mac.doFinal(secure, secureCount);
                        
            return secure;
        }
        catch (Exception e)
        {

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        String macAlgorithm = findMacAlgorithm(ctx);


        try
        {
            // keep local to avoid threading issue
            Mac mac = Mac.getInstance(macAlgorithm);
            mac.init(macSecretKey);
            Cipher cipher = Cipher.getInstance(algorithm + "/"
                    + algorithmParams);
            if (iv != null)
            {
                IvParameterSpec ivSpec = new IvParameterSpec(iv);
                cipher.init(Cipher.DECRYPT_MODE, secretKey, ivSpec);
            }
            else
            {
                cipher.init(Cipher.DECRYPT_MODE, secretKey);
            }
            if (log.isDebugEnabled())
            {
                log.debug("decrypting w/ " + algorithm + "/" + algorithmParams);
            }


            //EtM Composition Approach
            int macLenght = mac.getMacLength();
            mac.update(secure, 0, secure.length-macLenght);
            byte[] signedDigestHash = mac.doFinal();


            boolean isMacEqual = true;
            for (int i = 0; i < signedDigestHash.length; i++)
            {
                if (signedDigestHash[i] != secure[secure.length-macLenght+i])

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        /**
         * Make sure that we can generate the  Mac.
         */
        try {
            Mac mac = Mac.getInstance(algorithm);
            mac.init(key);
        } catch (NoSuchAlgorithmException e) {
            assert false : "Should never have reached here";
            throw new ProviderException("No such algorithm: " + algorithm + ".  This can be caused by a misconfigured java.ext.dirs, JAVA_HOME or JRE_HOME environment variable.");
        } catch (InvalidKeyException e) {
            assert false : "Should never have reached here";

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        for (int i = 7; i >= 0; i--) {
            bytes[i] = (byte) (n);
            n >>>= 8;
        }


        Mac mac = Mac.getInstance(algorithm);
        mac.init(key);
        mac.update(bytes);


        return mac.doFinal();
    }

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