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

    URLConnection connection = SecurityUtil.openSecureHttpConnection(url);
    InputStream stream = connection.getInputStream();
    MessageDigest digester = null;
    if (getChecksum) {
      digester = MD5Hash.getDigester();
      stream = new DigestInputStream(stream, digester);
    }
    FileOutputStream[] output = null;


    try {
      if (localPath != null) {

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        for (final File file : files) {
            if (!file.exists()) {
                continue;
            }


            DigestInputStream is = null;
            try {
                is = new DigestInputStream(new FileInputStream(file), digest);
                IO.copy(is, new NoopOutputStream()); // read the stream
            } catch (final IOException e) {
                // no-op: shouldn't occur here
            } finally {
                IO.close(is);

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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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      //
      // 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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                File src = (File) e.nextElement();
                if (!isCondition) {
                    log("Calculating " + algorithm + " checksum for " + src, Project.MSG_VERBOSE);
                }
                fis = new FileInputStream(src);
                DigestInputStream dis = new DigestInputStream(fis,
                                                              messageDigest);
                while (dis.read(buf, 0, readBufferSize) != -1) {
                    // Empty statement
                }
                dis.close();
                fis.close();
                fis = null;
                byte[] fileDigest = messageDigest.digest ();
                if (totalproperty != null) {
                    allDigests.put(src, fileDigest);

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            byte[] buf = new byte[readBufferSize];
            try {
                messageDigest.reset();
                fis = new FileInputStream(file);
                DigestInputStream dis = new DigestInputStream(fis,
                                                              messageDigest);
                while (dis.read(buf, 0, readBufferSize) != -1) {
                    // do nothing
                }
                dis.close();
                fis.close();
                fis = null;
                byte[] fileDigest = messageDigest.digest();
                StringBuffer checksumSb = new StringBuffer();
                for (int i = 0; i < fileDigest.length; i++) {

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        }


        InputStream is = open(connection);


        if (result != null)
            is = new DigestInputStream(is, result);


        FileOutputStream fos = new FileOutputStream(_dest);
        OutputStream os = new BufferedOutputStream(fos);


        byte[] buffer = new byte[100 * 1024];

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     * @throws NoSuchAlgorithmException
     */
    private String md5(InputStream is) throws IOException,
            NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("MD5");
        DigestInputStream dis = new DigestInputStream(is, digest);


        byte[] buffer = new byte[1024];


        int read = dis.read(buffer);
        while (read > -1) {
            read = dis.read(buffer);
        }


        return new String(encodeHex(dis.getMessageDigest().digest()));
    }

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     *
     * @throws NoSuchAlgorithmException
     *             If the running JVM doesn't support MD5 MessageDigests.
     */
    public ChecksumValidatingInputStream(InputStream in, byte[] expectedChecksum, String sourceObject) throws NoSuchAlgorithmException {
        super(new DigestInputStream(in, MessageDigest.getInstance("MD5")));
        this.expectedChecksum = expectedChecksum;
        this.sourceObject = sourceObject;
        this.digestInputStream = (DigestInputStream)super.in;
    }

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     * @throws NoSuchAlgorithmException
     */
    private String md5(InputStream is) throws IOException,
            NoSuchAlgorithmException {
        MessageDigest digest = MessageDigest.getInstance("MD5");
        DigestInputStream dis = new DigestInputStream(is, digest);


        byte[] buffer = new byte[1024];


        int read = dis.read(buffer);
        while (read > -1) {
            read = dis.read(buffer);
        }


        return new String(encodeHex(dis.getMessageDigest().digest()));
    }

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