com.microej.crypto.internal.mac

Class HmacCore

java.lang.Object

javax.crypto.MacSpi

com.microej.crypto.internal.mac.HmacCore

public class HmacCore
extends MacSpi

This class constitutes the core of HMAC-MD algorithms, where MD can be SHA1 or MD5, etc. See RFC 2104 for spec. It also contains the implementation classes for SHA-224, SHA-256, SHA-384, and SHA-512 HMACs. Implementation copied from com.sun.crypto.provider.HmacCore.

Author:

Jan Luehe

Constructor Summary

Constructors

Constructor and Description
HmacCore(String messageDigestAlgorithmName, int bl)

Method Summary

Modifier and Type	Method and Description
protected byte[]	engineDoFinal() Completes the MAC computation and resets the MAC for further use, maintaining the secret key that the MAC was initialized with.
protected int	engineGetMacLength() Returns the length of the MAC in bytes.
protected void	engineInit(Key key, AlgorithmParameterSpec params) Initializes the MAC with the given (secret) key and algorithm parameters.
protected void	engineReset() Resets the MAC for further use, maintaining the secret key that the MAC was initialized with.
protected void	engineUpdate(byte input) Processes the given byte.
protected void	engineUpdate(byte[] input, int offset, int len) Processes the first len bytes in input, starting at offset inclusive.

Methods inherited from class javax.crypto.MacSpi

clone

Methods inherited from class java.lang.Object

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

Constructor Detail

HmacCore

public HmacCore(String messageDigestAlgorithmName,
                int bl)

Method Detail

engineDoFinal

protected byte[] engineDoFinal()

Description copied from class: MacSpi

Completes the MAC computation and resets the MAC for further use, maintaining the secret key that the MAC was initialized with.

Specified by:

engineDoFinal in class MacSpi

Returns:

the MAC result.

engineGetMacLength

protected int engineGetMacLength()

Description copied from class: MacSpi

Returns the length of the MAC in bytes.

Specified by:

engineGetMacLength in class MacSpi

Returns:

the MAC length in bytes.

engineInit

protected void engineInit(Key key,
                          AlgorithmParameterSpec params)
                   throws InvalidKeyException,
                          InvalidAlgorithmParameterException

Description copied from class: MacSpi

Initializes the MAC with the given (secret) key and algorithm parameters.

Specified by:

engineInit in class MacSpi

Parameters:

key - the (secret) key.

params - the algorithm parameters.

Throws:

InvalidKeyException - if the given key is inappropriate for initializing this MAC.

InvalidAlgorithmParameterException - if the given algorithm parameters are inappropriate for this MAC.

engineReset

protected void engineReset()

Description copied from class: MacSpi

Resets the MAC for further use, maintaining the secret key that the MAC was initialized with.

Specified by:

engineReset in class MacSpi

engineUpdate

protected void engineUpdate(byte input)

Description copied from class: MacSpi

Processes the given byte.

Specified by:

engineUpdate in class MacSpi

Parameters:

input - the input byte to be processed.

engineUpdate

protected void engineUpdate(byte[] input,
                            int offset,
                            int len)

Description copied from class: MacSpi

Processes the first len bytes in input, starting at offset inclusive.

Specified by:

engineUpdate in class MacSpi

Parameters:

input - the input buffer.

offset - the offset in input where the input starts.

len - the number of bytes to process.