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<A NAME="digest"><!-- --></A><H3>
digest</H3>
<PRE>
protected <A HREF="../../java/security/MessageDigest.html">MessageDigest</A> <B>digest</B></PRE>
<DL>
<DD>The message digest associated with this stream.</DL>

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<A NAME="DigestInputStream(java.io.InputStream, java.security.MessageDigest)"><!-- --></A><H3>
DigestInputStream</H3>
<PRE>
public <B>DigestInputStream</B>(<A HREF="../../java/io/InputStream.html">InputStream</A>&nbsp;stream,
                         <A HREF="../../java/security/MessageDigest.html">MessageDigest</A>&nbsp;digest)</PRE>
<DL>
<DD>Creates a digest input stream, using the specified input stream
 and message digest.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>stream</CODE> - the input stream.<DD><CODE>digest</CODE> - the message digest to associate with this stream.</DL>
</DD>
</DL>

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<A NAME="getMessageDigest()"><!-- --></A><H3>
getMessageDigest</H3>
<PRE>
public <A HREF="../../java/security/MessageDigest.html">MessageDigest</A> <B>getMessageDigest</B>()</PRE>
<DL>
<DD>Returns the message digest associated with this stream.<DD><DL>
<DT><B>Returns:</B><DD>the message digest associated with this stream.<DT><B>See Also: </B><DD><A HREF="../../java/security/DigestInputStream.html#setMessageDigest(java.security.MessageDigest)"><CODE>setMessageDigest(java.security.MessageDigest)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="setMessageDigest(java.security.MessageDigest)"><!-- --></A><H3>
setMessageDigest</H3>
<PRE>
public void <B>setMessageDigest</B>(<A HREF="../../java/security/MessageDigest.html">MessageDigest</A>&nbsp;digest)</PRE>
<DL>
<DD>Associates the specified message digest with this stream.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>digest</CODE> - the message digest to be associated with this stream.<DT><B>See Also: </B><DD><A HREF="../../java/security/DigestInputStream.html#getMessageDigest()"><CODE>getMessageDigest()</CODE></A></DL>
</DD>
</DL>
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<A NAME="read()"><!-- --></A><H3>
read</H3>
<PRE>
public int <B>read</B>()
         throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Reads a byte, and updates the message digest (if the digest
 function is on).  That is, this method reads a byte from the
 input stream, blocking until the byte is actually read. If the
 digest function is on (see <A HREF="../../java/security/DigestInputStream.html#on(boolean)"><CODE>on</CODE></A>), this method
 will then call <code>update</code> on the message digest associated
 with this stream, passing it the byte read.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#read()">read</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Returns:</B><DD>the byte read.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.<DT><B>See Also: </B><DD><A HREF="../../java/security/MessageDigest.html#update(byte)"><CODE>MessageDigest.update(byte)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="read(byte[], int, int)"><!-- --></A><H3>
read</H3>
<PRE>
public int <B>read</B>(byte[]&nbsp;b,
                int&nbsp;off,
                int&nbsp;len)
         throws <A HREF="../../java/io/IOException.html">IOException</A></PRE>
<DL>
<DD>Reads into a byte array, and updates the message digest (if the
 digest function is on).  That is, this method reads up to
 <code>len</code> bytes from the input stream into the array
 <code>b</code>, starting at offset <code>off</code>. This method
 blocks until the data is actually
 read. If the digest function is on (see
 <A HREF="../../java/security/DigestInputStream.html#on(boolean)"><CODE>on</CODE></A>), this method will then call <code>update</code>
 on the message digest associated with this stream, passing it
 the data.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/io/FilterInputStream.html#read(byte[], int, int)">read</A></CODE> in class <CODE><A HREF="../../java/io/FilterInputStream.html">FilterInputStream</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the array into which the data is read.<DD><CODE>off</CODE> - the starting offset into <code>b</code> of where the
 data should be placed.<DD><CODE>len</CODE> - the maximum number of bytes to be read from the input
 stream into b, starting at offset <code>off</code>.<DT><B>Returns:</B><DD>the actual number of bytes read. This is less than
 <code>len</code> if the end of the stream is reached prior to
 reading <code>len</code> bytes. -1 is returned if no bytes were
 read because the end of the stream had already been reached when
 the call was made.<DT><B>Throws:</B><DD><CODE><A HREF="../../java/io/IOException.html">IOException</A></CODE> - if an I/O error occurs.<DT><B>See Also: </B><DD><A HREF="../../java/security/MessageDigest.html#update(byte[], int, int)"><CODE>MessageDigest.update(byte[], int, int)</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="on(boolean)"><!-- --></A><H3>
on</H3>
<PRE>
public void <B>on</B>(boolean&nbsp;on)</PRE>
<DL>
<DD>Turns the digest function on or off. The default is on.  When
 it is on, a call to one of the <code>read</code> methods results in an
 update on the message digest.  But when it is off, the message
 digest is not updated.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>on</CODE> - true to turn the digest function on, false to turn
 it off.</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public <A HREF="../../java/lang/String.html">String</A> <B>toString</B>()</PRE>
<DL>
<DD>Prints a string representation of this digest input stream and
 its associated message digest object.<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../java/lang/Object.html#toString()">toString</A></CODE> in class <CODE><A HREF="../../java/lang/Object.html">Object</A></CODE></DL>
</DD>
<DD>Following copied from class: <CODE>java.lang.Object</CODE></DD>
<DD><DL>
<DT><B>Returns:</B><DD>a string representation of the object.</DL>
</DD>
</DL>
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