gnu.crypto.sasl.srp

Class SRP

public final class SRP extends Object

A Factory class that returns SRP Singletons that know all SRP-related mathematical computations and protocol-related operations for both the client- and server-sides.

Version: $Revision: 1.6 $

Method Summary
byte[]computeX(byte[] s, String user, String password)
byte[]computeX(byte[] s, String user, byte[] p)
byte[]digest(byte[] src)

Convenience method to return the result of digesting the designated input with a new instance of the SRP message digest algorithm.

byte[]digest(String src)

Convenience method to return the result of digesting the designated input with a new instance of the SRP message digest algorithm.

byte[]generateKn(byte[] K, byte[] cn, byte[] sn)
byte[]generateM1(BigInteger N, BigInteger g, String U, byte[] s, BigInteger A, BigInteger B, byte[] K, String I, String L, byte[] cn, byte[] cCB)
byte[]generateM2(BigInteger A, byte[] M1, byte[] K, String U, String I, String o, byte[] sid, int ttl, byte[] cIV, byte[] sIV, byte[] sCB)
StringgetAlgorithm()
static SRPinstance(String mdName)

Returns an instance of this object that uses the designated message digest algorithm as its digest function.

IMessageDigestnewDigest()

Returns a new instance of the SRP message digest algorithm --which is SHA-160 by default, but could be anything else provided the proper conditions as specified in the SRP specifications.

byte[]xor(byte[] a, byte[] b)

Convenience method to XOR N bytes from two arrays; N being the output size of the SRP message digest algorithm.

Method Detail

computeX

public byte[] computeX(byte[] s, String user, String password)

computeX

public byte[] computeX(byte[] s, String user, byte[] p)

digest

public byte[] digest(byte[] src)

Convenience method to return the result of digesting the designated input with a new instance of the SRP message digest algorithm.

Parameters: src some bytes to digest.

Returns: the bytes constituting the result of digesting the designated input with a new instance of the SRP message digest algorithm.

digest

public byte[] digest(String src)

Convenience method to return the result of digesting the designated input with a new instance of the SRP message digest algorithm.

Parameters: src a String whose bytes (using US-ASCII encoding) are to be digested.

Returns: the bytes constituting the result of digesting the designated input with a new instance of the SRP message digest algorithm.

Throws: UnsupportedEncodingException if US-ASCII charset is not found.

generateKn

public byte[] generateKn(byte[] K, byte[] cn, byte[] sn)

generateM1

public byte[] generateM1(BigInteger N, BigInteger g, String U, byte[] s, BigInteger A, BigInteger B, byte[] K, String I, String L, byte[] cn, byte[] cCB)

generateM2

public byte[] generateM2(BigInteger A, byte[] M1, byte[] K, String U, String I, String o, byte[] sid, int ttl, byte[] cIV, byte[] sIV, byte[] sCB)

getAlgorithm

public String getAlgorithm()

Returns: the message digest algorithm name used by this instance.

instance

public static SRP instance(String mdName)

Returns an instance of this object that uses the designated message digest algorithm as its digest function.

Returns: an instance of this object for the designated digest name.

newDigest

public IMessageDigest newDigest()

Returns a new instance of the SRP message digest algorithm --which is SHA-160 by default, but could be anything else provided the proper conditions as specified in the SRP specifications.

Returns: a new instance of the underlying SRP message digest algorithm.

Throws: RuntimeException if the implementation of the message digest algorithm does not support cloning.

xor

public byte[] xor(byte[] a, byte[] b)

Convenience method to XOR N bytes from two arrays; N being the output size of the SRP message digest algorithm.

Parameters: a the first byte array. b the second one.

Returns: N bytes which are the result of the XOR operations on the first N bytes from the designated arrays. N is the size of the SRP message digest algorithm; eg. 20 for SHA-160.

Copyright © 2001, 2002, 2003 Free Software Foundation, Inc. All Rights Reserved.