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cryptix.jce.provider.mac
Class HMAC  

java.lang.Object
  javax.crypto.MacSpi
      cryptix.jce.provider.mac.HMAC

Direct Known Subclasses:

HMAC_MD2, HMAC_MD4, HMAC_MD5, HMAC_RIPEMD128, HMAC_RIPEMD160, HMAC_SHA0, HMAC_SHA1, HMAC_SHA256, HMAC_SHA384, HMAC_SHA512, HMAC_Tiger

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class HMAC

extends javax.crypto.MacSpi

Abstract class implementing the methods common to an HMAC. Subclasses implement specifics (just the name of MessageDigest to use + size).

Version:

$Revision: 1.6 $

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Field Summary
private static byte	IPAD           Inner and outer padding constants
private  byte[]	iv_i           Inner and outer IVs
private  byte[]	iv_o           Inner and outer IVs
private  java.security.MessageDigest	md           Underlying MessageDigest
private  int	mdBlockSize           Block size and length of underlying MessageDigest
private  int	mdLen           Block size and length of underlying MessageDigest
private static byte	OPAD           Inner and outer padding constants

 

Constructor Summary
private	HMAC(java.security.MessageDigest md, int mdBlockSize, int mdLen, byte[] iv_i, byte[] iv_o)           Private constructor used for cloning.
protected	HMAC(java.lang.String mdName, int mdBlockSize, int mdLen)           Construct an HMAC on top of a MessageDigest.

 

Method Summary
java.lang.Object	clone()           Clone this HMAC object.
protected  byte[]	engineDoFinal()           Finalize the computation of this MAC and return the result as a byte array.
protected  int	engineGetMacLength()           Return the length of this Mac which equals the length of the underlying MessageDigest.
protected  void	engineInit(java.security.Key key, java.security.spec.AlgorithmParameterSpec params)           Initialize (or re-initialize) this instance.
protected  void	engineReset()           Reset this instance.
protected  void	engineUpdate(byte input)           Update this MAC with a single byte.
protected  void	engineUpdate(byte[] input, int offset, int len)           Update this MAC with a portion of a byte array.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

IPAD

private static final byte IPAD

Inner and outer padding constants

See Also:

Constant Field Values

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OPAD

private static final byte OPAD

Inner and outer padding constants

See Also:

Constant Field Values

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md

private final java.security.MessageDigest md

Underlying MessageDigest

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mdBlockSize

private final int mdBlockSize

Block size and length of underlying MessageDigest

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mdLen

private final int mdLen

Block size and length of underlying MessageDigest

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iv_i

private final byte[] iv_i

Inner and outer IVs

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iv_o

private final byte[] iv_o

Inner and outer IVs

Constructor Detail

HMAC

protected HMAC(java.lang.String mdName,
               int mdBlockSize,
               int mdLen)

Construct an HMAC on top of a MessageDigest.

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HMAC

private HMAC(java.security.MessageDigest md,
             int mdBlockSize,
             int mdLen,
             byte[] iv_i,
             byte[] iv_o)

Private constructor used for cloning.

Method Detail

engineGetMacLength

protected final int engineGetMacLength()

Return the length of this Mac which equals the length of the underlying MessageDigest.

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engineInit

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

Description copied from class: javax.crypto.MacSpi

Initialize (or re-initialize) this instance.

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engineUpdate

protected final void engineUpdate(byte input)

Description copied from class: javax.crypto.MacSpi

Update this MAC with a single byte.

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engineUpdate

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

Description copied from class: javax.crypto.MacSpi

Update this MAC with a portion of a byte array.

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engineDoFinal

protected final byte[] engineDoFinal()

Description copied from class: javax.crypto.MacSpi

Finalize the computation of this MAC and return the result as a byte array.

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engineReset

protected final void engineReset()

Description copied from class: javax.crypto.MacSpi

Reset this instance. After this method succeeds, the state of this instance should be the same as it was before any data was input (possibly after a call to #init(java.security.Key,java.security.spec.AlgorithmParameterSpec), possibly not).

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clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Clone this HMAC object. We support cloning if the underlying MessageDigest does support cloning.

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