Package com.sshtools.common.ssh.components.jce

Class AbstractHmac

java.lang.Object

com.sshtools.common.ssh.components.jce.AbstractHmac

All Implemented Interfaces:

Component, SshComponent, SshHmac, SecureComponent

Direct Known Subclasses:

HmacMD5, HmacMD596, HmacMD5ETM, HmacRipeMd160, HmacRipeMd160ETM, HmacSha1, HmacSha196, HmacSha1ETM, HmacSha256, HmacSha256_at_ssh_dot_com, HmacSha256ETM, HmacSha512, HmacSha512ETM

public abstract class AbstractHmac
extends 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

Fields

Modifier and Type	Field	Description
protected String	jceAlgorithm
protected Mac	mac
protected int	macLength
protected int	macSize

Constructor Summary

Constructors

Constructor	Description
AbstractHmac(String jceAlgorithm, int macSize, int outputLength, SecurityLevel securityLevel, int priority)
AbstractHmac(String jceAlgorithm, int macLength, SecurityLevel securityLevel, int priority)

Method Summary

Modifier and Type	Method	Description
byte[]	doFinal()
void	generate(long sequenceNo, byte[] data, int offset, int len, byte[] output, int start)
abstract String	getAlgorithm()
int	getMacLength()	The length of the message digest output by this implementation (maybe lower than mac size);
int	getMacSize()	The size of the message digest output by the hmac algorithm
int	getPriority()
String	getProvider()
SecurityLevel	getSecurityLevel()
void	init(byte[] keydata)
boolean	isETM()
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 Details

mac

protected Mac mac

macSize

protected int macSize

macLength

protected int macLength

jceAlgorithm

protected String jceAlgorithm

Constructor Details

AbstractHmac

public AbstractHmac(String jceAlgorithm,
 int macLength,
 SecurityLevel securityLevel,
 int priority)

AbstractHmac

public AbstractHmac(String jceAlgorithm,
 int macSize,
 int outputLength,
 SecurityLevel securityLevel,
 int priority)

Method Details

getSecurityLevel

public SecurityLevel getSecurityLevel()

Specified by:

getSecurityLevel in interface SecureComponent

getPriority

public int getPriority()

Specified by:

getPriority in interface SecureComponent

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 String getAlgorithm()

Specified by:

getAlgorithm in interface SecureComponent

Specified by:

getAlgorithm in interface SshComponent

Specified by:

getAlgorithm in interface SshHmac

getProvider

public String getProvider()

getMacSize

public int getMacSize()

Description copied from interface: SshHmac

The size of the message digest output by the hmac algorithm

Specified by:

getMacSize in interface SshHmac

Returns:

getMacLength

public int getMacLength()

Description copied from interface: SshHmac

The length of the message digest output by this implementation (maybe lower than mac size);

Specified by:

getMacLength in interface SshHmac

Returns:

isETM

public boolean isETM()

Specified by:

isETM 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