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 writeBlob(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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      {
         byte[] buffer = new byte[1 << 4];
         MessageDigest md = MessageDigest.getInstance("MD5");


         FileInputStream is = new FileInputStream(file);
         DigestInputStream is2 = new DigestInputStream(is, md);
         while (is2.read(buffer) > 0)
         {
            continue;
         }
         byte[] digest = md.digest();
         is.close();
         is2.close();
         return Base64.encodeBytes(digest);
      }
      catch (Exception e)
      {
         throw new RuntimeException(e);

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      {
         byte[] buffer = new byte[1 << 4];
         MessageDigest md = MessageDigest.getInstance("MD5");


         FileInputStream is = new FileInputStream(file);
         DigestInputStream is2 = new DigestInputStream(is, md);
         while (is2.read(buffer) > 0)
         {
            continue;
         }
         byte[] digest = md.digest();
         is.close();
         is2.close();
         return Base64.encodeBytes(digest);
      }
      catch (Exception e)
      {
         throw new RuntimeException(e);

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      //
      // Load in bits
      //
      MessageDigest digester = MD5Hash.getDigester();
      DigestInputStream fin = new DigestInputStream(
           new FileInputStream(curFile), digester);


      DataInputStream in = new DataInputStream(fin);
      try {
        // read image version: first appeared in version -1

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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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   */
  public static MD5Hash computeMd5ForFile(File dataFile) throws IOException {
    InputStream in = new FileInputStream(dataFile);
    try {
      MessageDigest digester = MD5Hash.getDigester();
      DigestInputStream dis = new DigestInputStream(in, digester);
      IOUtils.copyBytes(dis, new IOUtils.NullOutputStream(), 128*1024);
      
      return new MD5Hash(digester.digest());
    } finally {
      IOUtils.closeStream(in);

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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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                    // prevent that rs.close() is called again
                    rs = null;
                }
            }
            MessageDigest digest = getDigest();
            DigestInputStream dIn = new DigestInputStream(stream, digest);
            CountingInputStream in = new CountingInputStream(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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                log.error(msg);
                throw new DataStoreException(msg);
            }
            temporaryInUse.add(tempId);
            MessageDigest digest = getDigest();
            DigestInputStream dIn = new DigestInputStream(stream, digest);
            CountingInputStream in = new CountingInputStream(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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                    // prevent that rs.close() is called again
                    rs = null;
                }
            }
            MessageDigest digest = getDigest();
            DigestInputStream dIn = new DigestInputStream(stream, digest);
            CountingInputStream in = new CountingInputStream(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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