oracle.security.crypto.core
Class HMAC

java.lang.Object
oracle.security.crypto.core.MessageDigest
oracle.security.crypto.core.HMAC

All Implemented Interfaces:

java.lang.Cloneable

public final class HMAC

extends MessageDigest

This class implements HMAC [RFC2104] as a subclass of MessageDigest. MD5 and SHA are supported.

Nested Class Summary

Nested classes inherited from class oracle.security.crypto.core.MessageDigest

MessageDigest.MDState

Field Summary

Fields inherited from class oracle.security.crypto.core.MessageDigest

algID, digestBits, digestValid

Constructor Summary

HMAC()

HMAC(AlgorithmIdentifier hashAlgID, byte[] key)

HMAC(AlgorithmIdentifier hashAlgID, byte[] key, int keyOff, int keyLen)

Method Summary

java.lang.String	algName() Returns the algorithm name of this HMAC.
int	blockSize()
java.lang.Object	clone() Returns a clone of this HMAC object.
void	computeCurrent() Completes the hash computation, performing any necessary operations such as padding.
AlgorithmIdentifier	getAlgID()
int	getDigestLength() Returns the length in bytes of the message digest.
protected MessageDigest.MDState	getState()
void	init() Resets this HMAC object to its initial state.
void	setAlgID(AlgorithmIdentifier algID)
void	setKey(byte[] key)
void	setKey(byte[] key, int keyOff, int keyLen)
protected void	setState(MessageDigest.MDState state)
void	update(byte b) Adds the specifed byte to the data being digested.
void	update(byte[] input, int off, int len) Adds the specified sequence of bytes to the data being digested.

Methods inherited from class oracle.security.crypto.core.MessageDigest

computeDigest, computeDigest, getDigestBits, getInstance, isEqual, isEqual, toString, update, update, update, update, update, update, update, update, update, update, updateASCII

Methods inherited from class java.lang.Object

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

Constructor Detail

HMAC

public HMAC()

HMAC

public HMAC(AlgorithmIdentifier hashAlgID,
            byte[] key,
            int keyOff,
            int keyLen)
     throws AlgorithmIdentifierException

HMAC

public HMAC(AlgorithmIdentifier hashAlgID,
            byte[] key)
     throws AlgorithmIdentifierException

Method Detail

setAlgID

public void setAlgID(AlgorithmIdentifier algID)
              throws AlgorithmIdentifierException

Overrides:

setAlgID in class MessageDigest

Throws:

AlgorithmIdentifierException

getAlgID

public AlgorithmIdentifier getAlgID()

Specified by:

getAlgID in class MessageDigest

setKey

public void setKey(byte[] key,
                   int keyOff,
                   int keyLen)

setKey

public void setKey(byte[] key)

init

public void init()

Resets this HMAC object to its initial state.

Specified by:

init in class MessageDigest

update

public void update(byte b)

Adds the specifed byte to the data being digested.

Specified by:

update in class MessageDigest

update

public void update(byte[] input,
                   int off,
                   int len)

Adds the specified sequence of bytes to the data being digested.

Overrides:

update in class MessageDigest

Parameters:

input - the input array

off - start position in the input array

len - the number of input array elements to add to the data being digested

computeCurrent

public void computeCurrent()

Completes the hash computation, performing any necessary operations such as padding. The result of the hash can be retrieved using MessageDigest.getDigestBits().

Specified by:

computeCurrent in class MessageDigest

algName

public java.lang.String algName()

Returns the algorithm name of this HMAC. Possible name would be "HMAC-MD5" and "HMAC-SHA".

Specified by:

algName in class MessageDigest

Returns:

algorithm name

blockSize

public int blockSize()

Specified by:

blockSize in class MessageDigest

getDigestLength

public int getDigestLength()

Description copied from class: MessageDigest

Returns the length in bytes of the message digest.

Specified by:

getDigestLength in class MessageDigest

clone

public java.lang.Object clone()

Returns a clone of this HMAC object.

Specified by:

clone in class MessageDigest

getState

protected MessageDigest.MDState getState()

Specified by:

getState in class MessageDigest

setState

protected void setState(MessageDigest.MDState state)

Specified by:

setState in class MessageDigest