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This class is a byte output stream with
an associated MessageDigest object. When bytes are
written to the stream with any of the write( ) methods,
those bytes are automatically passed to the update(
) method of the MessageDigest. When you
have finished writing bytes, you can call the digest(
) method of the MessageDigest to obtain
a message digest. If you want to compute a digest just for some of
the bytes written to the stream, use on( ) to turn the
digesting function on and off. Digesting is on by default; call
on(false) to turn it off. See also
DigestInputStream and
MessageDigest.
Figure 14-9. java.security.DigestOutputStream
public class DigestOutputStream extends java.io.FilterOutputStream {
// Public Constructors
public DigestOutputStream (java.io.OutputStream stream ,
MessageDigest digest );
// Public Instance Methods
public MessageDigest getMessageDigest ( );
public void on (boolean on );
public void setMessageDigest (MessageDigest digest );
// Public Methods Overriding FilterOutputStream
public void write (int b ) throws java.io.IOException;
public void write (byte[ ] b , int off , int len ) throws java.io.IOException;
// Public Methods Overriding Object
public String toString ( );
// Protected Instance Fields
protected MessageDigest digest ;
}