java.security
Class DigestOutputStream
java.lang.Object
|
+--java.io.OutputStream
|
+--java.io.FilterOutputStream
|
+--java.security.DigestOutputStream
DigestOutputStream is a class that ties an OutputStream with a
MessageDigest. The Message Digest is used by the class to update it
self as bytes are written to the OutputStream.
The updating to the digest depends on the on flag which is set to
true by default that tells the class to update the data in the
message digest.
Author:- Mark Benvenuto <ivymccough@worldnet.att.net>
digest
protected MessageDigest digest
The message digest for the DigestOutputStream
DigestOutputStream
public DigestOutputStream(java.io.OutputStream stream, java.security.MessageDigest digest)
Constructs a new DigestOutputStream. It associates a
MessageDigest with the stream to compute the stream as data is
written.
Parameters:
getMessageDigest
public MessageDigest getMessageDigest()
Returns the MessageDigest associated with this DigestOutputStream
Returns:
- The MessageDigest used to hash this stream
on
public void on(boolean on)
Sets the flag specifying if this DigestOutputStream updates the
digest in the write() methods. The default is on;
Parameters:
setMessageDigest
public void setMessageDigest(java.security.MessageDigest digest)
Sets the current MessageDigest to current parameter
Parameters:
toString
public String toString()
Converts the output stream and underlying message digest to a string.
Returns:
- A string representing the output stream and message digest.
write
public void write(byte[] , int off, int len)
Updates the hash if the on flag is true and then writes the bytes
to the underlying output stream.
Parameters:
Throws:
IOException
- if the underlying output stream
cannot write the bytes, this is thrown.
write
public void write(int b)
Updates the hash if the on flag is true and then writes a byte to
the underlying output stream.
Parameters:
Throws:
IOException
- if the underlying output stream
cannot write the byte, this is thrown.