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


    long received = 0;
    MessageDigest digester = null;
    if (getChecksum) {
      digester = MD5Hash.getDigester();
      stream = new DigestInputStream(stream, digester);
    }
    boolean finishedReceiving = false;


    List<FileOutputStream> outputStreams = Lists.newArrayList();

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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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                    // 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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            /* Computing message digest for the file */
            md = MessageDigest.getInstance(alg);
            FileInputStream fin = new FileInputStream(file);
            BufferedInputStream bin = new BufferedInputStream(fin, BUFSIZE);
            DigestInputStream in = new DigestInputStream(bin, md);
            in.on(true);
            byte[] buf = new byte[BUFSIZE];
            byte[] mdbyte = new byte[BUFSIZE];


            while (true) {
                int n = in.read(buf, 0, buf.length);


                if (n < 0) {
                    break;
                }
            }
            md = in.getMessageDigest();
            mdbyte = md.digest();
            return digestString(mdbyte);
        }

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            } catch (Exception e) {
                md = MessageDigest.getInstance(ALG);
            }
            FileInputStream fin = new FileInputStream(fileObj);
            BufferedInputStream bin = new BufferedInputStream(fin, BUFSIZE);
            DigestInputStream in = new DigestInputStream(bin, md);
            in.on(true);
            byte[] buf = new byte[BUFSIZE];
            byte[] mdbyte = new byte[BUFSIZE];


            while (true) {
                int n = in.read(buf, 0, buf.length);


                if (n < 0) {
                    break;
                }
            }
            md = in.getMessageDigest();
            mdbyte = md.digest();
            return digestString(mdbyte);
        }

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    protected static String getSHA(StringBuffer primaryXML) throws NoSuchAlgorithmException, IOException {
        // Note:  For RHEL6 this may need to change to "SHA-256", 
        // going for SHA for now, as it's a lowest common denominator so it can work with older clients.
        MessageDigest md = MessageDigest.getInstance("SHA");
        ByteArrayInputStream bis = new ByteArrayInputStream(primaryXML.toString().getBytes());
        DigestInputStream mdistr = new DigestInputStream(bis, md);
        while (mdistr.read() != -1) {
            ;
        }
        mdistr.close();
        return Hex.encodeHexString(md.digest());
    }

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        }
    }


    private String calculateDigest() throws Exception {
        MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
        DigestInputStream in = null;
        
        try {
            in = new DigestInputStream(new FileInputStream(fileToBeCheckedLocation), messageDigest);
            byte[] buffer = new byte[4096];
            while (in.read(buffer) != -1) {
            }
        } finally {
            StreamUtil.safeClose(in);
        }

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     * @throws Exception On all errors.
     */
    String sha(InputStream istr) throws Exception {
        byte[] bfr = new byte[10240];
        MessageDigest md = MessageDigest.getInstance("SHA");
        DigestInputStream mdistr = new DigestInputStream(istr, md);
        while (mdistr.read(bfr) != -1) {
            ;
        }


        mdistr.close();
        byte[] b = md.digest();
        String result = "";
        for (int i = 0; i < b.length; i++) {
            result += Integer.toString((b[i] & 0xff) + 0x100, 16).substring(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 String addBlob(String tempFilePath) {
        try {
            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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