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cryptix.sasl.otp
Class OTPDigest  

java.lang.Object
  cryptix.sasl.otp.OTPDigest

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final class OTPDigest

extends java.lang.Object

This object encapsulates the concrete implementation of the Message Digest Algorithm instance used by an incarnation of an OTP session.

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 OTP message digest algorithm.
private  java.lang.String	digestName
private  java.security.MessageDigest	md           The root of all instances of the underlying OTP message digest algorithm.

 

Constructor Summary
private	OTPDigest(java.security.MessageDigest md, java.lang.String mdaName)           Trivial private constructor to enforce Singleton pattern.

 

Method Summary
(package private)  int	getDigestLength()           Return the size of the output, in bytes, of the message digest algorithm.
(package private)  java.lang.String	getDigestName()
(package private) static OTPDigest	getInstance(java.lang.String mdaName)
(package private)  java.security.MessageDigest	newDigest()           Returns a new instance of the OTP message digest algorithm --which is SHA-1 by default, but could be anything else provided the proper conditions as specified in the OTP 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 OTP message digest algorithm.

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md

private java.security.MessageDigest md

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

In this code of the OTP 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.

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digestName

private java.lang.String digestName

Constructor Detail

OTPDigest

private OTPDigest(java.security.MessageDigest md,
                  java.lang.String mdaName)

Trivial private constructor to enforce Singleton pattern.

Method Detail

getInstance

static OTPDigest getInstance(java.lang.String mdaName)

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getDigestLength

int getDigestLength()

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

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getDigestName

java.lang.String getDigestName()

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newDigest

java.security.MessageDigest newDigest()

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

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