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Class IALG  view IALG download

  extended bycryptix.sasl.srp.IALG
All Implemented Interfaces:

public final class IALG
extends java.lang.Object
implements java.lang.Cloneable

A Factory class that returns IALG (Integrity Algorithm) instances that operate as described in the draft-burdis-cat-sasl-srp-04.

$Revision: 1.1 $

Field Summary
private  java.lang.String algorithm
private static org.apache.log4j.Category cat
private  javax.crypto.Mac hmac
Constructor Summary
private IALG(java.lang.String algorithm, javax.crypto.Mac hmac)
          Trivial private constructor to enforce Singleton pattern.
Method Summary
 java.lang.Object clone()
          This method may be called to create a new copy of the Object.
 byte[] doFinal()
static IALG getInstance(java.lang.String algorithm, javax.crypto.SecretKey K)
          Returns an instance of a SASL-SRP IALG implementation.
 void update(byte[] data)
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


private static org.apache.log4j.Category cat


private java.lang.String algorithm


private javax.crypto.Mac hmac
Constructor Detail


private IALG(java.lang.String algorithm,
             javax.crypto.Mac hmac)
Trivial private constructor to enforce Singleton pattern.

Method Detail


public static IALG getInstance(java.lang.String algorithm,
                               javax.crypto.SecretKey K)
Returns an instance of a SASL-SRP IALG implementation.


public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException
Description copied from class: java.lang.Object
This method may be called to create a new copy of the Object. The typical behavior is as follows:
  • o == o.clone() is false
  • o.getClass() == o.clone().getClass() is true
  • o.equals(o) is true

However, these are not strict requirements, and may be violated if necessary. Of the three requirements, the last is the most commonly violated, particularly if the subclass does not override Object.equals(Object)>Object.equals(Object) 55 .

If the Object you call clone() on does not implement java.lang.Cloneable (which is a placeholder interface), then a CloneNotSupportedException is thrown. Notice that Object does not implement Cloneable; this method exists as a convenience for subclasses that do.

Object's implementation of clone allocates space for the new Object using the correct class, without calling any constructors, and then fills in all of the new field values with the old field values. Thus, it is a shallow copy. However, subclasses are permitted to make a deep copy.

All array types implement Cloneable, and override this method as follows (it should never fail):

 public Object clone()
   catch (CloneNotSupportedException e)
       throw new InternalError(e.getMessage());


public void update(byte[] data)


public byte[] doFinal()