java/security/DigestOutputStream.java

36  * A transparent stream that updates the associated message digest using
39  * <p>To complete the message digest computation, call one of the
40  * {@code digest} methods on the associated message
41  * digest after your calls to one of this digest output stream's
47  * an update on the message digest.  But when it is off, the message
48  * digest is not updated. The default is for the stream to be on.
61      * The message digest associated with this stream.
63     protected MessageDigest digest;
66      * Creates a digest output stream, using the specified output stream
67      * and message digest.
71      * @param digest the message digest to associate with this stream.
73     public DigestOutputStream(OutputStream stream, MessageDigest digest) {
75         setMessageDigest(digest);
79      * Returns the message digest associated with this stream.
81      * @return the message digest associated with this stream.
85         return digest;
89      * Associates the specified message digest with this stream.
91      * @param digest the message digest to be associated with this stream.
94     public void setMessageDigest(MessageDigest digest) {
95         this.digest = digest;
99      * Updates the message digest (if the digest function is on) using
101      * to the output stream. That is, if the digest function is on
103      * {@code update} on the message digest associated with this
118             digest.update((byte)b);
123      * Updates the message digest (if the digest function is on) using
125      * the output stream. That is, if the digest function is on (see
127      * on the message digest associated with this stream, passing it
148             digest.update(b, off, len);
153      * Turns the digest function on or off. The default is on.  When
155      * update on the message digest.  But when it is off, the message
156      * digest is not updated.
158      * @param on true to turn the digest function on, false to turn it
166      * Prints a string representation of this digest output stream and
167      * its associated message digest object.
170          return "[Digest Output Stream] " + digest.toString();