Examples of java.security.DigestOutputStream

java.security.DigestOutputStream
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 ouput stream's {@link #write(int) write} 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 write 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. @see MessageDigest @see DigestInputStream @version 1.32 05/11/17 @author Benjamin Renaud

        ByteArrayOutputStream devnull = new ByteArrayOutputStream(512);


        long h = 0;
        try {
            MessageDigest md = MessageDigest.getInstance("SHA");
            DigestOutputStream mdo = new DigestOutputStream(devnull, md);
            DataOutputStream data = new DataOutputStream(mdo);


            if (DEBUG_SVUID)
                msg( "\twriteUTF( \"" + cl.getName() + "\" )" ) ;
            data.writeUTF(cl.getName());

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            if (java.io.Externalizable.class.isAssignableFrom(cl)) {
                return 1;
            }


            MessageDigest md = MessageDigest.getInstance("SHA");
            DigestOutputStream mdo = new DigestOutputStream(devnull, md);
            DataOutputStream data = new DataOutputStream(mdo);


            // Get SUID of parent
            Class parent = cl.getSuperclass();
            if ((parent != null))

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            if (java.io.Externalizable.class.isAssignableFrom(cl)) {
                return 1;
            }


            MessageDigest md = MessageDigest.getInstance("SHA");
            DigestOutputStream mdo = new DigestOutputStream(devnull, md);
            DataOutputStream data = new DataOutputStream(mdo);


            // Get SUID of parent
            Class parent = cl.getSuperclass();
            if ((parent != null))

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        ByteArrayOutputStream devnull = new ByteArrayOutputStream(512);


        long h = 0;
        try {
            MessageDigest md = MessageDigest.getInstance("SHA");
            DigestOutputStream mdo = new DigestOutputStream(devnull, md);
            DataOutputStream data = new DataOutputStream(mdo);




            data.writeUTF(cl.getName());

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    public byte[] getHash() {
        if (hash == null) {
            try {
                MessageDigest d = MessageDigest.getInstance("SHA-1");
                DigestOutputStream out = new DigestOutputStream(new OutputStream() {
                    @Override
                    public void write(byte[] buff, int off, int length) {
                        // ignore
                    }
                    @Override

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            usesIdentifier(tempId);
            // Copy the stream to the temporary file and calculate the
            // stream length and the message digest of the stream
            long length = 0;
            MessageDigest digest = MessageDigest.getInstance(DIGEST);
            OutputStream output = new DigestOutputStream(
                    new FileOutputStream(temporary), digest);
            try {
                length = IOUtils.copyLarge(input, output);
            } finally {
                output.close();
            }
            DataIdentifier identifier = new DataIdentifier(digest.digest());
            File file;


            synchronized (this) {

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      this.key = key;
      this.backupFile = newBackupFile();
      LOG.info("OutputStream for key '" + key + "' writing to tempfile '" + this.backupFile + "'");
      try {
        this.digest = MessageDigest.getInstance("MD5");
        this.backupStream = new BufferedOutputStream(new DigestOutputStream(
            new FileOutputStream(backupFile), this.digest));
      } catch (NoSuchAlgorithmException e) {
        LOG.warn("Cannot load MD5 digest algorithm," +
            "skipping message integrity check.", e);
        this.backupStream = new BufferedOutputStream(

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      //
      // Write out data
      //
      MessageDigest digester = MD5Hash.getDigester();
      FileOutputStream fout = new FileOutputStream(newFile);
      DigestOutputStream fos = new DigestOutputStream(fout, digester);
      DataOutputStream out = new DataOutputStream(fos);
      try {
        out.writeInt(HdfsConstants.LAYOUT_VERSION);
        // We use the non-locked version of getNamespaceInfo here since
        // the coordinating thread of saveNamespace already has read-locked

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        assert path != null : "Expect SWF path";


        final OutputStream outputStream = new BufferedOutputStream(new FileOutputStream(new File(directory, path)));
        ISWFWriter swfWriter = swfWriterFactory.createSWFWriter(swf, 
                getLibrarySWFCompression(), enableDebug);
        final DigestOutputStream digestStream = getDigestOutputStream(library, outputStream);
        
        swfWriter.writeTo(digestStream != null ? digestStream : outputStream);
        swfWriter.close();
        outputStream.close();

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     * 
     * @return a digest stream if a digest is needed, null otherwise.
     */
    protected DigestOutputStream getDigestOutputStream(ISWCLibrary library, OutputStream outputStream)
    {
        DigestOutputStream digestStream = null;
        MessageDigest messageDigest = null;
        if (!hasUnsignedDigest(library))
        {
            try
            {
                messageDigest = MessageDigest.getInstance(SWCDigest.SHA_256);
                digestStream = new DigestOutputStream(outputStream, messageDigest);
            }
            catch (NoSuchAlgorithmException e)
            {
                // Eat the exception, this should never happen in a
                // production environment.

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