com.ibm.crypto.fips.provider

Class AuthHmacSHA512256

java.lang.Object

javax.crypto.MacSpi

com.ibm.crypto.fips.provider.AuthHmacSHA512256

All Implemented Interfaces:

java.lang.Cloneable

public final class AuthHmacSHA512256
extends javax.crypto.MacSpi
implements java.lang.Cloneable

This is an implementation of the AUTH_HMAC_SHA_512_256 algorithm.

Constructor Summary

Constructors

Constructor and Description
AuthHmacSHA512256() Standard constructor, creates a new HmacSHA512 instance.

Method Summary

Methods

Modifier and Type	Method and Description
java.lang.Object	clone()
protected byte[]	engineDoFinal() Completes the HMAC computation and resets the HMAC for further use, maintaining the secret key that the HMAC was initialized with.
protected int	engineGetMacLength() Returns the length of the HMAC in bytes.
protected void	engineInit(java.security.Key key, java.security.spec.AlgorithmParameterSpec params) Initializes the HMAC with the given secret key and algorithm parameters.
protected void	engineReset() Resets the HMAC for further use, maintaining the secret key that the HMAC 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.

Methods inherited from class javax.crypto.MacSpi

engineUpdate

Methods inherited from class java.lang.Object

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

Constructor Detail

AuthHmacSHA512256

public AuthHmacSHA512256()
                  throws java.security.NoSuchAlgorithmException

Standard constructor, creates a new HmacSHA512 instance. Verify the JCE framework in the constructor.

Throws:

java.lang.SecurityException - if fails to verify the JCE framework.

java.security.NoSuchAlgorithmException

Method Detail

engineGetMacLength

protected int engineGetMacLength()

Returns the length of the HMAC in bytes.

Specified by:

engineGetMacLength in class javax.crypto.MacSpi

Returns:

the HMAC length in bytes.

engineInit

protected void engineInit(java.security.Key key,
              java.security.spec.AlgorithmParameterSpec params)
                   throws java.security.InvalidKeyException,
                          java.security.InvalidAlgorithmParameterException

Initializes the HMAC with the given secret key and algorithm parameters.

Specified by:

engineInit in class javax.crypto.MacSpi

Parameters:

key - the secret key.

params - the algorithm parameters.

Throws:

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

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

engineUpdate

protected void engineUpdate(byte input)

Processes the given byte.

Specified by:

engineUpdate in class javax.crypto.MacSpi

Parameters:

input - the input byte to be processed.

engineUpdate

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

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

Specified by:

engineUpdate in class javax.crypto.MacSpi

Parameters:

input - the input buffer.

offset - the offset in input where the input starts.

len - the number of bytes to process.

engineDoFinal

protected byte[] engineDoFinal()

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

Specified by:

engineDoFinal in class javax.crypto.MacSpi

Returns:

the HMAC result.

engineReset

protected void engineReset()

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

Specified by:

engineReset in class javax.crypto.MacSpi

clone

public java.lang.Object clone()

Overrides:

clone in class javax.crypto.MacSpi