Class HmacT64

java.lang.Object

com.hierynomus.security.mac.HmacT64

All Implemented Interfaces:

Mac

public class HmacT64
extends Object
implements Mac

This is an implementation of the HMACT64 keyed hashing algorithm. HMACT64 is defined by Luke Leighton as a modified HMAC-MD5 (RFC 2104) in which the key is truncated at 64 bytes (rather than being hashed via MD5).

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	BLOCK_LENGTH
private byte[]	ipad
private static final byte	IPAD
private MessageDigest	md5
private byte[]	opad
private static final byte	OPAD

Constructor Summary

Constructors

Constructor	Description
HmacT64(MessageDigest md5)	Creates an HMACT64 instance which uses the given secret key material.

Method Summary

Modifier and Type	Method	Description
byte[]	doFinal()
void	init(byte[] key)
void	reset()
void	update(byte b)
void	update(byte[] array)
void	update(byte[] array, int offset, int length)

Methods inherited from class Object

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

Field Details

BLOCK_LENGTH

private static final int BLOCK_LENGTH

See Also:

• Constant Field Values

IPAD

private static final byte IPAD

See Also:

• Constant Field Values

OPAD

private static final byte OPAD

See Also:

• Constant Field Values

md5

private MessageDigest md5

ipad

private byte[] ipad

opad

private byte[] opad

Constructor Details

HmacT64

public HmacT64(MessageDigest md5)

Creates an HMACT64 instance which uses the given secret key material.

Method Details

init

public void init(byte[] key)
          throws SecurityException

Specified by:

init in interface Mac

Throws:

SecurityException

doFinal

public byte[] doFinal()

Specified by:

doFinal in interface Mac

update

public void update(byte b)

Specified by:

update in interface Mac

update

public void update(byte[] array)

Specified by:

update in interface Mac

update

public void update(byte[] array,
 int offset,
 int length)

Specified by:

update in interface Mac

reset

public void reset()

Specified by:

reset in interface Mac