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

            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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    }


    private static String writeMF(File dir, Manifest manifest, ZipOutputStream zos) throws NoSuchAlgorithmException,
            IOException {
        MessageDigest md = MessageDigest.getInstance("SHA1");
        DigestOutputStream dos = new DigestOutputStream(zos, md);
        zipAndSha1(dir, zos, dos, manifest);
        Attributes main = manifest.getMainAttributes();
        main.putValue("Manifest-Version", "1.0");
        main.putValue("Created-By", "tiny-sign-" + TinySign.class.getPackage().getImplementationVersion());
        zos.putNextEntry(new ZipEntry("META-INF/MANIFEST.MF"));

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        return new String(Base64.encodeBase64(data));
    }


    private static Manifest generateSF(Manifest manifest) throws NoSuchAlgorithmException, UnsupportedEncodingException {
        MessageDigest md = MessageDigest.getInstance("SHA1");
        PrintStream print = new PrintStream(new DigestOutputStream(new OutputStream() {


            @Override
            public void write(byte[] arg0) throws IOException {
            }

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            if (withIntegrityPacket)
            {
                String digestName = PGPUtil.getDigestName(HashAlgorithmTags.SHA1);
                MessageDigest digest = MessageDigest.getInstance(digestName, defProvider);
                genOut = digestOut = new DigestOutputStream(cOut, digest);
            }


            byte[] inLineIv = new byte[c.getBlockSize() + 2];
            rand.nextBytes(inLineIv);
            inLineIv[inLineIv.length - 1] = inLineIv[inLineIv.length - 3];

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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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        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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        digest = MessageDigest.getInstance("MD5");
      } catch (NoSuchAlgorithmException e) {
        throw (IOException) (new IOException("No MD5 implementation")
        .initCause(e));
      }
      DigestOutputStream digestStream = new DigestOutputStream(
          new NullOutputStream(), digest);
      PrintWriter pw = new PrintWriter(digestStream);
      String line;
      String existingMD5 = null;
      while ((line = br.readLine()) != null) {
        if (line.startsWith(MD5_LINE_PART_1)) {
          existingMD5 = line.replaceAll(MD5_LINE_PART_1q, "").replaceAll(
              MD5_LINE_PART_2q, "");
        } else {
          pw.println(line);
        }
      }


      pw.close();
      String calculatedDigest = toHexString(digestStream
          .getMessageDigest().digest());


      if (existingMD5 == null || !existingMD5.equals(calculatedDigest)) {
        // No checksum in file, or checksum differs.
        needToWrite = false;

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        }
        OutputStream base;
        if (digest == null) {
            base = new FileOutputStream(localFile);
        } else {
            base = new DigestOutputStream(
                    new FileOutputStream(localFile), digest);
        }
        if (lineFeed != null) {
            base = new LineOutputStream(base, lineFeed);
        }

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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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            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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