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

      try {
    Field[] fields = getFields(clazz);
    MessageDigest md = MessageDigest.getInstance("SHA");
    DataOutputStream out =
        new DataOutputStream(
      new DigestOutputStream(new ByteArrayOutputStream(127),
                 md));
    Class c = clazz.getSuperclass();
    if (c != Object.class)
        // recursive call
        out.writeLong(findHash(c, marshaling).longValue());

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    private void computeHash() throws IOException, NoSuchAlgorithmException
    {
  hash = 0;
  MessageDigest md = MessageDigest.getInstance("SHA");
  DataOutputStream out = new DataOutputStream(
      new DigestOutputStream(new ByteArrayOutputStream(127),md));      
  out.writeUTF(name);     
  out.flush();
  byte[] digest = md.digest();
  for (int i = Math.min(8, digest.length); --i >= 0; ) {
      hash += ((long) (digest[i] & 0xFF)) << (i * 8);

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        } else
            try {
                ByteArrayOutputStream barr = new ByteArrayOutputStream(512);
                MessageDigest md = MessageDigest.getInstance("SHA");
                DigestOutputStream digestout = new DigestOutputStream(barr, md);
                DataOutputStream out = new DataOutputStream(digestout);


                Class superType = type.getSuperclass();
                if (superType != null) {
                    TypeDescriptor desc = getTypeRepository().getDescriptor(

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        byte[] block = new byte[blockSize];
        int count = 0;
        while (true) {
            MessageDigest messageDigest = MessageDigest.getInstance(HASH_ALGORITHM);
            ByteArrayOutputStream buff = new ByteArrayOutputStream();
            DigestOutputStream dout = new DigestOutputStream(buff, messageDigest);
            int blockLen = IOUtils.readFully(in, block, 0, block.length);
            count++;
            if (blockLen == 0) {
                break;
            } else if (blockLen < blockSizeMin) {
                idStream.write(TYPE_DATA);
                IOUtils.writeVarInt(idStream, blockLen);
                idStream.write(block, 0, blockLen);
                totalLength += blockLen;
            } else {
                dout.write(block, 0, blockLen);
                byte[] digest = messageDigest.digest();
                idStream.write(TYPE_HASH);
                IOUtils.writeVarInt(idStream, level);
                if (level > 0) {
                    IOUtils.writeVarLong(idStream, totalLength);

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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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     * the digest value.
     */
    @Override
    public void write(OutputStream outputStream) throws IOException {
        getWrappedRepresentation().write(
                new DigestOutputStream(outputStream, this.computedDigest));
    }

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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);


            //In the old case, for the caller class, the write Method wasn't considered
            // for rep-id calculations correctly, but for parent classes it was taken
            // into account.  That is the reason there is the klude of getting the write

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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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        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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