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

     * <code>read()</code> must not work when digest
     * functionality is on
     */
    public final void testRead05() {
        InputStream is = new ByteArrayInputStream(myMessage);
        DigestInputStream dis = new DigestInputStream(is, null);


        // must result in an exception
        try {
            for (int i=0; i<MY_MESSAGE_LEN; i++) {
                dis.read();
            }
            fail("read() must not work when digest functionality is on");
        } catch (Exception e) {
        }
    }

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     */
    public final void testRead06()
        throws IOException {
        InputStream is = new ByteArrayInputStream(myMessage);
        // construct object without digest
        DigestInputStream dis = new DigestInputStream(is, null);
        // set digest functionality to off
        dis.on(false);
        // the following must pass without any exception
        for (int i=0; i<MY_MESSAGE_LEN; i++) {
            assertTrue((byte)dis.read() == myMessage[i]);
        }
    }

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        throws IOException {        
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                byte[] bArray = new byte[MY_MESSAGE_LEN];
                
                // check that read(byte[],int,int) returns valid value
                assertTrue("retval",
                        dis.read(bArray, 0, bArray.length) == MY_MESSAGE_LEN);
                // check that bArray has been filled properly
                assertTrue("bArray", Arrays.equals(myMessage, bArray));
                // check that associated digest has been updated properly
                assertTrue("update", Arrays.equals(dis.getMessageDigest().digest(),
                        MDGoldenData.getDigest(algorithmName[ii])));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                byte[] bArray = new byte[MY_MESSAGE_LEN];
                
                for (int i=0; i<MY_MESSAGE_LEN/CHUNK_SIZE; i++) {
                    // check that read(byte[],int,int) returns valid value
                    assertTrue("retval",
                            dis.read(bArray, i*CHUNK_SIZE, CHUNK_SIZE) == CHUNK_SIZE);
                }
                // check that bArray has been filled properly
                assertTrue("bArray", Arrays.equals(myMessage, bArray));
                // check that associated digest has been updated properly
                assertTrue("update", Arrays.equals(dis.getMessageDigest().digest(),
                        MDGoldenData.getDigest(algorithmName[ii])));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                byte[] bArray = new byte[MY_MESSAGE_LEN];
                
                for (int i=0; i<MY_MESSAGE_LEN/(CHUNK_SIZE+1); i++) {
                    // check that read(byte[],int,int) returns valid value
                    assertTrue("retval1",
                            dis.read(bArray, i*(CHUNK_SIZE+1), CHUNK_SIZE+1) ==
                                CHUNK_SIZE + 1);
                }
                
                // check that last call returns right
                // number of remaining bytes
                assertTrue("retval2",
                        dis.read(bArray,
                                MY_MESSAGE_LEN/(CHUNK_SIZE+1)*(CHUNK_SIZE+1),
                                MY_MESSAGE_LEN % (CHUNK_SIZE+1)) ==
                                    (MY_MESSAGE_LEN % (CHUNK_SIZE+1)));
                
                // check that bArray has been filled properly
                assertTrue("bArray", Arrays.equals(myMessage, bArray));
                // check that associated digest has been updated properly
                assertTrue("update", Arrays.equals(dis.getMessageDigest().digest(),
                        MDGoldenData.getDigest(algorithmName[ii])));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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        throws IOException {        
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                byte[] bArray = new byte[MY_MESSAGE_LEN];
                // read all but EOS
                dis.read(bArray, 0, bArray.length);
                // check that subsequent read(byte[],int,int) calls return -1 (EOS)
                assertEquals("retval1", -1, dis.read(bArray, 0, 1));
                assertEquals("retval2", -1, dis.read(bArray, 0, bArray.length));
                assertEquals("retval3", -1, dis.read(bArray, 0, 1));
                // check that 3 previous read() calls did not update digest
                assertTrue("update",
                        Arrays.equals(dis.getMessageDigest().digest(),
                                MDGoldenData.getDigest(algorithmName[ii])));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                byte[] bArray = new byte[MY_MESSAGE_LEN];
                
                // turn digest off
                dis.on(false);
                
                for (int i=0; i<MY_MESSAGE_LEN/CHUNK_SIZE; i++) {
                    dis.read(bArray, i*CHUNK_SIZE, CHUNK_SIZE);
                }
                // check that digest has not been updated
                assertTrue(Arrays.equals(dis.getMessageDigest().digest(),
                        MDGoldenData.getDigest(algorithmName[ii]+"_NU")));
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }

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     */
    public final void testGetMessageDigest() {
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                DigestInputStream dis = new DigestInputStream(null, md);
                
                assertTrue(dis.getMessageDigest() == md);
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }
        }

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     * Assertion: set associated message digest<br>
     */
    public final void testSetMessageDigest() {
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                DigestInputStream dis = new DigestInputStream(null, null);
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                dis.setMessageDigest(md);
                
                assertTrue(dis.getMessageDigest() == md);
                return;
            } catch (NoSuchAlgorithmException e) {
                // allowed failure
            }
        }

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    public final void testOn() throws IOException {
        for (int ii=0; ii<algorithmName.length; ii++) {
            try {
                MessageDigest md = MessageDigest.getInstance(algorithmName[ii]);
                InputStream is = new ByteArrayInputStream(myMessage);
                DigestInputStream dis = new DigestInputStream(is, md);
                
                // turn digest off
                dis.on(false);
                
                for (int i=0; i<MY_MESSAGE_LEN-1; i++) {
                    dis.read();
                }
                
                // turn digest on
                dis.on(true);
                
                // read remaining byte
                dis.read();
                
                byte[] digest = dis.getMessageDigest().digest();
                
                // check that digest value has been
                // updated by the last read() call
                assertFalse(
                        Arrays.equals(digest,MDGoldenData.getDigest(algorithmName[ii])) ||

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