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

    private void renderPDF(String fo, String digestIn, String digestOut)
        throws Exception {
        FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
        foUserAgent.setCreationDate(new Date(10000));
        MessageDigest outDigest = MessageDigest.getInstance("MD5");
        DigestOutputStream out =
            new DigestOutputStream(new ByteArrayOutputStream(), outDigest);
        Fop fop = fopFactory.newFop(MimeConstants.MIME_PDF, foUserAgent, out);
        InputSource source = new InputSource(new StringReader(fo));
        DigestFilter filter = new DigestFilter("MD5");
        filter.setParent(parserFactory.newSAXParser().getXMLReader());
        filter.setContentHandler(fop.getDefaultHandler());

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

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            final OutputStream os = new OutputStream() {
                public void write(int b) throws IOException {
                    //
                }
            };
            final DigestOutputStream dos = new DigestOutputStream(os, messageDigest);
            calculateHash(file, dos);
            sha1Bytes = messageDigest.digest();
        }
        final File content = getExternalFileReference(sha1Bytes, true);
        final OutputStream os = new FileOutputStream(content);

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           throws Exception
   {
      long hash = 0;
      ByteArrayOutputStream bytearrayoutputstream = new ByteArrayOutputStream(512);
      MessageDigest messagedigest = MessageDigest.getInstance("SHA");
      DataOutputStream dataoutputstream = new DataOutputStream(new DigestOutputStream(bytearrayoutputstream, messagedigest));
      dataoutputstream.writeUTF(methodDesc);
      dataoutputstream.flush();
      byte abyte0[] = messagedigest.digest();
      for (int j = 0; j < Math.min(8, abyte0.length); j++)
         hash += (long) (abyte0[j] & 0xff) << j * 8;

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    }
  }


  void writeTo(final OutputStream os) throws IOException {
    final MessageDigest foot = Constants.newMessageDigest();
    final DigestOutputStream dos = new DigestOutputStream(os, foot);


    boolean extended = false;
    for (int i = 0; i < entryCnt; i++)
      extended |= sortedEntries[i].isExtended();


    // Write the header.
    //
    final byte[] tmp = new byte[128];
    System.arraycopy(SIG_DIRC, 0, tmp, 0, SIG_DIRC.length);
    NB.encodeInt32(tmp, 4, extended ? 3 : 2);
    NB.encodeInt32(tmp, 8, entryCnt);
    dos.write(tmp, 0, 12);


    // Write the individual file entries.
    //
    if (lastModified <= 0) {
      // Write a new index, as no entries require smudging.
      //
      for (int i = 0; i < entryCnt; i++)
        sortedEntries[i].write(dos);
    } else {
      final int smudge_s = (int) (lastModified / 1000);
      final int smudge_ns = ((int) (lastModified % 1000)) * 1000000;
      for (int i = 0; i < entryCnt; i++) {
        final DirCacheEntry e = sortedEntries[i];
        if (e.mightBeRacilyClean(smudge_s, smudge_ns))
          e.smudgeRacilyClean();
        e.write(dos);
      }
    }


    if (tree != null) {
      final TemporaryBuffer bb = new TemporaryBuffer.LocalFile();
      tree.write(tmp, bb);
      bb.close();


      NB.encodeInt32(tmp, 0, EXT_TREE);
      NB.encodeInt32(tmp, 4, (int) bb.length());
      dos.write(tmp, 0, 8);
      bb.writeTo(dos, null);
    }


    os.write(foot.digest());
    os.close();

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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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            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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        } finally {
          destroy();
        }
      }
    };
    return encryption.encrypt(new DigestOutputStream(buffer, md5));
  }

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      try {
        OutputStream out = fOut;
        if (config.getFSyncObjectFiles())
          out = Channels.newOutputStream(fOut.getChannel());
        DeflaterOutputStream cOut = compress(out);
        DigestOutputStream dOut = new DigestOutputStream(cOut, md);
        writeHeader(dOut, type, len);


        final byte[] buf = buffer();
        while (len > 0) {
          int n = is.read(buf, 0, (int) Math.min(len, buf.length));
          if (n <= 0)
            throw shortInput(len);
          dOut.write(buf, 0, n);
          len -= n;
        }
        dOut.flush();
        cOut.finish();
      } finally {
        if (config.getFSyncObjectFiles())
          fOut.getChannel().force(true);
        fOut.close();

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   * @param dst
   *            the stream this instance outputs to. If not already buffered
   *            it will be automatically wrapped in a buffered stream.
   */
  protected PackIndexWriter(final OutputStream dst) {
    out = new DigestOutputStream(dst instanceof BufferedOutputStream ? dst
        : new BufferedOutputStream(dst), Constants.newMessageDigest());
    tmp = new byte[4 + Constants.OBJECT_ID_LENGTH];
  }

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