DigestInputStream

DigestInputStream

java.security

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Java 1.1

closeable

This class is a byte input stream with an associated MessageDigest object. When bytes are read with any of the read( ) methods , those bytes are automatically passed to the update( ) method of the MessageDigest . When you have finished reading 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 read from 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 DigestOutputStream and MessageDigest .

Figure 14-8. java.security.DigestInputStream

 public class  DigestInputStream  extends java.io.FilterInputStream {  // Public Constructors  public  DigestInputStream  (java.io.InputStream  stream  , MessageDigest  digest  );  // Public Instance Methods  public MessageDigest  getMessageDigest  ( );        public void  on  (boolean  on  );        public void  setMessageDigest  (MessageDigest  digest  );  // Public Methods Overriding FilterInputStream  public int  read  ( ) throws java.io.IOException;        public int  read  (byte[ ]  b  , int  off  , int  len  ) throws java.io.IOException;  // Public Methods Overriding Object  public String  toString  ( );  // Protected Instance Fields  protected MessageDigest  digest  ;   }