org.spongycastle.jcajce.io

Class MacOutputStream

java.lang.Object

java.io.OutputStream

org.spongycastle.jcajce.io.MacOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable, java.lang.AutoCloseable

public final class MacOutputStream
extends java.io.OutputStream

An output stream which calculates a MAC based on the data that is written to it.

Constructor Summary

Constructors

Constructor and Description
MacOutputStream(javax.crypto.Mac mac) Base constructor - specify the MAC algorithm to use.

Method Summary

Modifier and Type	Method and Description
byte[]	getMac() Execute doFinal() and return the calculated MAC.
void	write(byte[] bytes, int off, int len) Write a block of data of length len starting at offset off in the byte array bytes to the stream.
void	write(int b) Write a single byte to the stream.

Methods inherited from class java.io.OutputStream

close, flush, write

Methods inherited from class java.lang.Object

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

Constructor Detail

MacOutputStream

public MacOutputStream(javax.crypto.Mac mac)

Base constructor - specify the MAC algorithm to use.

Parameters:

mac - the MAC implementation to use as the basis of the stream.

Method Detail

write

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

Write a single byte to the stream.

Specified by:

write in class java.io.OutputStream

Parameters:

b - the byte value to write.

Throws:

java.io.IOException - in case of failure.

write

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

Write a block of data of length len starting at offset off in the byte array bytes to the stream.

Overrides:

write in class java.io.OutputStream

Parameters:

bytes - byte array holding the data.

off - offset into bytes that the data starts at.

len - the length of the data block to write.

Throws:

java.io.IOException - in case of failure.

getMac

public byte[] getMac()

Execute doFinal() and return the calculated MAC.

Returns:

the MAC calculated from the output written to the stream.