Java in a Nutshell, 5th Edition

Name

MessageDigestSpi

Synopsis

This abstract class defines the service-provider interface for MessageDigest. A security provider must implement a concrete subclass of this class for each message-digest algorithm it supports. Applications never need to use or subclass this class.

public abstract class MessageDigestSpi {
// Public Constructors
     public MessageDigestSpi( );  
// Public Methods Overriding Object
     public Object clone( ) throws CloneNotSupportedException;  
// Protected Instance Methods
     protected abstract byte[ ] engineDigest( );  
     protected int engineDigest(byte[ ] buf, int offset, int len) 
         throws DigestException;  
     protected int engineGetDigestLength( );               constant
     protected abstract void engineReset( );  
     protected abstract void engineUpdate(byte input);  
5.0  protected void engineUpdate(java.nio.ByteBuffer input);  
     protected abstract void engineUpdate(byte[ ] input, int offset, int len);  
}

Subclasses

MessageDigest