com.maverick.ssh.components.jce
Class AbstractHmac

java.lang.Object
  com.maverick.ssh.components.jce.AbstractHmac

All Implemented Interfaces:

SshHmac

Direct Known Subclasses:

HmacMD5, HmacMD596, HmacSha1, HmacSha196, HmacSha256, HmacSha512

public abstract class AbstractHmac
extends java.lang.Object
implements SshHmac

An abstract class that implements the SshHmac interface to provide support for JCE based message authentication.

Author:

Lee David Painter

Field Summary

protected java.lang.String	jceAlgorithm
protected javax.crypto.Mac	mac
protected int	macLength
protected int	macSize

Constructor Summary

AbstractHmac(java.lang.String jceAlgorithm, int macLength)

AbstractHmac(java.lang.String jceAlgorithm, int macSize, int outputLength)

Method Summary

byte[]	doFinal()
void	generate(long sequenceNo, byte[] data, int offset, int len, byte[] output, int start)
abstract java.lang.String	getAlgorithm()
int	getMacLength()
java.lang.String	getProvider()
void	init(byte[] keydata)
void	update(byte[] b)
boolean	verify(long sequenceNo, byte[] data, int start, int len, byte[] mac, int offset)

Methods inherited from class java.lang.Object

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

Field Detail

mac

protected javax.crypto.Mac mac

macSize

protected int macSize

macLength

protected int macLength

jceAlgorithm

protected java.lang.String jceAlgorithm

Constructor Detail

AbstractHmac

public AbstractHmac(java.lang.String jceAlgorithm,
                    int macLength)

AbstractHmac

public AbstractHmac(java.lang.String jceAlgorithm,
                    int macSize,
                    int outputLength)

Method Detail

generate

public void generate(long sequenceNo,
                     byte[] data,
                     int offset,
                     int len,
                     byte[] output,
                     int start)

Specified by:

generate in interface SshHmac

update

public void update(byte[] b)

Specified by:

update in interface SshHmac

doFinal

public byte[] doFinal()

Specified by:

doFinal in interface SshHmac

getAlgorithm

public abstract java.lang.String getAlgorithm()

Specified by:

getAlgorithm in interface SshHmac

getProvider

public java.lang.String getProvider()

getMacLength

public int getMacLength()

Specified by:

getMacLength in interface SshHmac

init

public void init(byte[] keydata)
          throws SshException

Specified by:

init in interface SshHmac

Throws:

SshException

verify

public boolean verify(long sequenceNo,
                      byte[] data,
                      int start,
                      int len,
                      byte[] mac,
                      int offset)

Specified by:

verify in interface SshHmac