File	Doc	Category	Size	Date	Package
DigestOutputStream.java	API Doc	Java SE 5 API	4913	Fri Aug 26 14:57:14 BST 2005	java.security

DigestOutputStream

• java.lang.Object
  • java.io.OutputStream
    • java.io.FilterOutputStream

Fields Summary
private boolean	on
protected MessageDigest	digest The message digest associated with this stream.

Constructors Summary
public DigestOutputStream(OutputStream stream, MessageDigest digest) Creates a digest output stream, using the specified output stream and message digest. param stream the output stream. param digest the message digest to associate with this stream. super(stream); setMessageDigest(digest);

Methods Summary
public java.security.MessageDigest	getMessageDigest() Returns the message digest associated with this stream. return the message digest associated with this stream. see #setMessageDigest(java.security.MessageDigest) return digest;
public void	on(boolean on) Turns the digest function on or off. The default is on. When it is on, a call to one of the write methods results in an update on the message digest. But when it is off, the message digest is not updated. param on true to turn the digest function on, false to turn it off. this.on = on;
public void	setMessageDigest(java.security.MessageDigest digest) Associates the specified message digest with this stream. param digest the message digest to be associated with this stream. see #getMessageDigest() this.digest = digest;
public java.lang.String	toString() Prints a string representation of this digest output stream and its associated message digest object. return "[Digest Output Stream] " + digest.toString();
public void	write(int b) Updates the message digest (if the digest function is on) using the specified byte, and in any case writes the byte to the output stream. That is, if the digest function is on (see {@link #on(boolean) on}), this method calls update on the message digest associated with this stream, passing it the byte b. This method then writes the byte to the output stream, blocking until the byte is actually written. param b the byte to be used for updating and writing to the output stream. exception IOException if an I/O error occurs. see MessageDigest#update(byte) if (on) { digest.update((byte)b); } out.write(b);
public void	write(byte[] b, int off, int len) Updates the message digest (if the digest function is on) using the specified subarray, and in any case writes the subarray to the output stream. That is, if the digest function is on (see {@link #on(boolean) on}), this method calls update on the message digest associated with this stream, passing it the subarray specifications. This method then writes the subarray bytes to the output stream, blocking until the bytes are actually written. param b the array containing the subarray to be used for updating and writing to the output stream. param off the offset into b of the first byte to be updated and written. param len the number of bytes of data to be updated and written from b, starting at offset off. exception IOException if an I/O error occurs. see MessageDigest#update(byte[], int, int) if (on) { digest.update(b, off, len); } out.write(b, off, len);