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


            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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     * instance of the {@link DigestInputStream} class, which allows to compute
     * progressively the digest value.
     */
    @Override
    public InputStream getStream() throws IOException {
        return new DigestInputStream(getWrappedRepresentation().getStream(),
                this.computedDigest);
    }

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        catch (NoSuchAlgorithmException e)
        {
            throw new XmlRuntimeException(e);
        }


        DigestInputStream str = new DigestInputStream(input, sha);


        return str;
    }

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        {
            URL url = new URL( schemaLocation );
            URLConnection conn = url.openConnection();
            conn.setRequestProperty("User-Agent", USER_AGENT);
            conn.setRequestProperty("Accept", "application/xml, text/xml, */*");
            DigestInputStream input = digestInputStream(conn.getInputStream());
            IOUtil.copyCompletely(input, buffer);
            digest = HexBin.bytesToString(input.getMessageDigest().digest());
        }
        catch (Exception e)
        {
            warning("Could not copy remote resource " + schemaLocation + ":" + e.getMessage());
            return;

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        }


        try
        {
            URL url = new URL( schemaLocation );
            DigestInputStream input = digestInputStream(url.openStream());
            writeInputStreamToFile(input, targetFilename);
            digest = HexBin.bytesToString(input.getMessageDigest().digest());
        }
        catch (Exception e)
        {
            warning("Could not copy remote resource " + schemaLocation + ":" + e.getMessage());
            return null;

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        resource.setNamespace(actualNamespace);
    }


    private String shaDigestForFile(String filename) throws IOException
    {
        DigestInputStream str = digestInputStream(inputStreamForFile(filename));


        byte[] dummy = new byte[4096];
        for (int i = 1; i > 0; i = str.read(dummy));


        str.close();


        return HexBin.bytesToString(str.getMessageDigest().digest());
    }

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    }


    public Checksum update( InputStream stream )
        throws IOException
    {
        DigestInputStream dig = new DigestInputStream( stream, md );
        IOUtils.copy( dig, new NullOutputStream() );


        return this;
    }

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                truncStream = new TruncatedStream(encStream);


                String digestName = PGPUtil.getDigestName(HashAlgorithmTags.SHA1);
                MessageDigest digest = MessageDigest.getInstance(digestName, provider);


                encStream = new DigestInputStream(truncStream, digest);
            }


            for (int i = 0; i != iv.length; i++)
            {
                int    ch = encStream.read();

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                encStream = new BCPGInputStream(new CipherInputStream(encData.getInputStream(), c2));
                
                if (encData instanceof SymmetricEncIntegrityPacket)
                {
                    truncStream = new TruncatedStream(encStream);
                    encStream = new DigestInputStream(truncStream, MessageDigest.getInstance(PGPUtil.getDigestName(HashAlgorithmTags.SHA1), provider));
                }
                
                for (int i = 0; i != iv.length; i++)
                {
                    int    ch = encStream.read();

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        if (!this.isIntegrityProtected())
        {
            throw new PGPException("data not integrity protected.");
        }
        
        DigestInputStream    dIn = (DigestInputStream)encStream;


        //
        // make sure we are at the end.
        //
        while (encStream.read() >= 0)
        {
            // do nothing
        }


        MessageDigest        hash = dIn.getMessageDigest();
        
        //
        // process the MDC packet
        //
        int[]    lookAhead = truncStream.getLookAhead();

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