Examples of java.security.DigestInputStream

java.security.DigestInputStream
A transparent stream that updates the associated message digest using the bits going through the stream.
To complete the message digest computation, call one of the digest methods on the associated message digest after your calls to one of this digest input stream's {@link #read() read} methods.
It is possible to turn this stream on or off (see {@link #on(boolean) on}). When it is on, a call to one of the read methods results in an update on the message digest. But when it is off, the message digest is not updated. The default is for the stream to be on.
Note that digest objects can compute only one digest (see {@link MessageDigest}), so that in order to compute intermediate digests, a caller should retain a handle onto the digest object, and clone it for each digest to be computed, leaving the orginal digest untouched. @see MessageDigest @see DigestOutputStream @version 1.38 05/11/17 @author Benjamin Renaud

    @Override
    public String addBlob(String tempFilePath) throws Exception {
        File file = new File(tempFilePath);
        InputStream in = new FileInputStream(file);
        MessageDigest messageDigest = MessageDigest.getInstance(HASH_ALGORITHM);
        DigestInputStream din = new DigestInputStream(in, messageDigest);
        long length = file.length();
        try {
            while (true) {
                int len = din.read(buffer, 0, buffer.length);
                if (len < 0) {
                    break;
                }
            }
        } finally {
            din.close();
        }
        ByteArrayOutputStream idStream = new ByteArrayOutputStream();
        idStream.write(TYPE_HASH);
        IOUtils.writeVarInt(idStream, 0);
        IOUtils.writeVarLong(idStream, length);

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                log.error(msg);
                throw new DataStoreException(msg);
            }
            temporaryInUse.add(tempId);
            MessageDigest digest = getDigest();
            DigestInputStream dIn = new DigestInputStream(stream, digest);
            TrackingInputStream in = new TrackingInputStream(dIn);
            StreamWrapper wrapper;
            if (STORE_SIZE_MINUS_ONE.equals(storeStream)) {
                wrapper = new StreamWrapper(in, -1);
            } else if (STORE_SIZE_MAX.equals(storeStream)) {

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  /**
   * Calculate the MD5 hash of the newly-merged fsimage.
   * @return the checksum of the newly-merged fsimage.
   */
  MD5Hash getNewChecksum() throws IOException {
    DigestInputStream imageIn = null;
    try {
      MessageDigest digester = MD5Hash.getDigester();
      imageIn = new DigestInputStream(
          new FileInputStream(checkpointImage.getFsImageName()), digester);
      byte[] in = new byte[BUFFER_SIZE];
      int totalRead = 0;
      int read = 0;
      while ((read = imageIn.read(in)) > 0) {
        totalRead += read;
        LOG.debug("Computing fsimage checksum. Read " + totalRead + " bytes so far.");
      }
      return new MD5Hash(digester.digest());
    } finally {
      if (imageIn != null) {
        imageIn.close();
      }
    }
  }

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    }


    public XmlObject parse ( InputStream jiois, SchemaType type, XmlOptions options ) throws XmlException, IOException
    {
        XmlFactoryHook hook = XmlFactoryHook.ThreadContext.getHook();
        DigestInputStream digestStream = null;
        setupDigest: if (options != null && options.hasOption(XmlOptions.LOAD_MESSAGE_DIGEST))
        {
            MessageDigest sha;
            try
            {
                sha = MessageDigest.getInstance("SHA");
            }
            catch (NoSuchAlgorithmException e)
            {
                break setupDigest;
            }


            digestStream = new DigestInputStream(jiois, sha);
            jiois = digestStream;
        }


        if (hook != null)
            return hook.parse( this, jiois, type, options );


        XmlObject result = createNewStore( null, options ).loadXml( jiois, type, options );


        if (digestStream != null)
            result.documentProperties().setMessageDigest(digestStream.getMessageDigest().digest());


        return result;
    }

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    public final void testDigestInputStream01()  {
        for (int i=0; i<algorithmName.length; i++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[i]);
                InputStream is = new ByteArrayInputStream(myMessage);
                InputStream dis = new DigestInputStream(is, md);
                assertTrue(dis instanceof DigestInputStream);
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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     * 
     * Assertion: creates new <code>DigestInputStream</code> instance
     * using valid parameters (both <code>null</code>)
     */
    public final void testDigestInputStream02() {
        InputStream dis = new DigestInputStream(null, null);
        assertTrue(dis instanceof DigestInputStream);
    }

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        throws IOException {
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                for (int i=0; i<MY_MESSAGE_LEN; i++) {
                    // check that read() returns valid values
                    assertTrue("retval", ((byte)dis.read() == myMessage[i]));
                }
                // check that associated digest has been updated properly
                assertTrue("update",
                        Arrays.equals(
                                dis.getMessageDigest().digest(),
                                MDGoldenData.getDigest(algorithmName[ii])));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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        throws IOException {
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                for (int i=0; i<MY_MESSAGE_LEN; i++) {
                    dis.read();
                }
                // check that subsequent read() calls return -1 (eos)
                assertEquals("retval1", -1, dis.read());
                assertEquals("retval2", -1, dis.read());
                assertEquals("retval3", -1, dis.read());
                // check that 3 previous read() calls did not update digest
                assertTrue("update",
                        Arrays.equals(dis.getMessageDigest().digest(),
                                MDGoldenData.getDigest(algorithmName[ii])));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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        throws IOException {
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                
                // turn digest off
                dis.on(false);
                
                for (int i=0; i<MY_MESSAGE_LEN; i++) {
                    dis.read();
                }
                
                // check that digest value has not been updated by read()
                assertTrue(Arrays.equals(dis.getMessageDigest().digest(),
                        MDGoldenData.getDigest(algorithmName[ii]+"_NU")));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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     */
    public final void testRead04() throws IOException {
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                DigestInputStream dis = new DigestInputStream(null, md);
                // must result in an exception
                try {
                    for (int i=0; i<MY_MESSAGE_LEN; i++) {
                        dis.read();
                    }
                } catch (Exception e) {
                    return;
                }

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