Skip navigation links

oracle.security.crypto.core
Class DigestOutputStream

java.lang.Object
java.io.OutputStream
java.io.FilterOutputStream
oracle.security.crypto.core.DigestOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

public class DigestOutputStream

extends java.io.FilterOutputStream

An output stream that keeps a message digest of the bytes going through it.

The computeCurrent() method computes and returns the current digest.

Field Summary

protected MessageDigest

messageDigest The message digest used by this stream.

Fields inherited from class java.io.FilterOutputStream

out

Constructor Summary

DigestOutputStream(java.io.OutputStream os, MessageDigest md)
Create a new DigestOutputStream with specified OutputStream and Message Digest.

Method Summary

byte[]	computeCurrent() Compute and return the current message digest.
MessageDigest	getMessageDigest() Return the message digest for this stream.
void	setMessageDigest(MessageDigest md) Set the message digest for this stream.
void	write(byte[] b, int off, int len) Write a sub array of bytes.
void	write(int b) Write one byte of data.

Methods inherited from class java.io.FilterOutputStream

close, flush, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

messageDigest

protected MessageDigest messageDigest

The message digest used by this stream.

Constructor Detail

DigestOutputStream

public DigestOutputStream(java.io.OutputStream os,
                          MessageDigest md)

Create a new DigestOutputStream with specified OutputStream and Message Digest.

Method Detail

write

public void write(int b)
           throws java.io.IOException

Write one byte of data. Blocks until byte is actually written. Updates the message digest.

Overrides:

write in class java.io.FilterOutputStream

Throws:

java.io.IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException

Write a sub array of bytes. Updates the message digest.

Overrides:

write in class java.io.FilterOutputStream

Parameters:

b - the data to be written

off - start offset of data

len - number of bytes to write

Throws:

java.io.IOException

computeCurrent

public byte[] computeCurrent()

Compute and return the current message digest.

getMessageDigest

public MessageDigest getMessageDigest()

Return the message digest for this stream.

setMessageDigest

public void setMessageDigest(MessageDigest md)

Set the message digest for this stream.

Skip navigation links