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cryptix.sasl.srp
Class SRPDigest  

java.lang.Object
  cryptix.sasl.srp.SRPDigest

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final class SRPDigest

extends java.lang.Object

The SRP protocol does not disallow the use of digest algorithms other than SHA. This object encapsulates the concrete implementation of the Message Digest Algorithm instance used by an incarnation of an SRP agreement.

Since:

draft-burdis-cat-sasl-srp-04

Version:

$Revision: 1.3 $

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Field Summary
private static org.apache.log4j.Category	cat
private  int	digestLength           The size of the output (in bytes) of the underlying SRP message digest algorithm.
private  java.security.MessageDigest	md           The root of all instances of the underlying SRP message digest algorithm.

 

Constructor Summary
private	SRPDigest(java.security.MessageDigest md)           Trivial private constructor to enforce Singleton pattern.

 

Method Summary
(package private)  byte[]	digestInterleaved(byte[] ba)           Performs an interleaved even-odd hash on the designated byte string.
(package private)  int	getDigestLength()           Returns the size of the output, in bytes, of the message digest algorithm.
(package private) static SRPDigest	getInstance(java.lang.String mdName)           Returns an instance of this object for the designated message digest algorithm.
(package private)  java.security.MessageDigest	newDigest()           Returns a new instance of the SRP message digest algorithm --which is SHA-1 by default, but could be anything else provided the proper conditions as specified in the SRP specifications.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

cat

private static org.apache.log4j.Category cat

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digestLength

private int digestLength

The size of the output (in bytes) of the underlying SRP message digest algorithm.

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md

private java.security.MessageDigest md

The root of all instances of the underlying SRP message digest algorithm.

In this code of the SRP protocol we use Sun's SHA implementation. In later version this will change to use any provider's implementation but we shall add some verification tests (known test vectors) to ensure it is reliable.

Constructor Detail

SRPDigest

private SRPDigest(java.security.MessageDigest md)

Trivial private constructor to enforce Singleton pattern.

Method Detail

getInstance

static SRPDigest getInstance(java.lang.String mdName)

Returns an instance of this object for the designated message digest algorithm.

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getDigestLength

int getDigestLength()

Returns the size of the output, in bytes, of the message digest algorithm.

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newDigest

java.security.MessageDigest newDigest()

Returns a new instance of the SRP message digest algorithm --which is SHA-1 by default, but could be anything else provided the proper conditions as specified in the SRP specifications.

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digestInterleaved

byte[] digestInterleaved(byte[] ba)

Performs an interleaved even-odd hash on the designated byte string.

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