ostore.security.thresh
Class KeyShare

java.lang.Object
  |
  +--ostore.security.thresh.KeyShare

All Implemented Interfaces:

QuickSerializable

public class KeyShare

extends Object

implements QuickSerializable

A Secret Key Share for an RSA (k,l) Threshold Scheme.

Reference: "Practical Threshold Signatures", Victor Shoup (sho@zurich.ibm.com), IBM Research Paper RZ3121, 4/30/99

Version:

$Id: KeyShare.java,v 1.23 2002/08/02 19:39:56 geels Exp $

Author:

Steve Weis

Constructor Summary

KeyShare(InputBuffer buffer)

KeyShare(int id, SafeBigInt secret, SafeBigInt n, SafeBigInt delta)
Create a new share

Method Summary

int	getId()
SafeBigInt	getSecret()
SafeBigInt	getSignVal()
SafeBigInt	getVerifier()
void	serialize(OutputBuffer buffer) Add the object to the buffer.
void	setVerifiers(SafeBigInt verifier, SafeBigInt groupVerifier)
SigShare	sign_using_c(SafeBigInt x, SafeBigInt n, SafeBigInt r, boolean debug)
SigShare	sign(byte[] b) Create a SigShare and a Verifier for byte[] b Refer to Shoup pg. 8
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

KeyShare

public KeyShare(InputBuffer buffer)
         throws QSException

KeyShare

public KeyShare(int id,
                SafeBigInt secret,
                SafeBigInt n,
                SafeBigInt delta)

Create a new share

Parameters:

id - - the identifier of this share

secret - - a secret value generated by a Dealer

n - - the modulo of the group public key

delta - - l! (group size factorial)

Method Detail

serialize

public void serialize(OutputBuffer buffer)

Description copied from interface: QuickSerializable

Add the object to the buffer.

Specified by:

serialize in interface QuickSerializable

Parameters:

buffer - the output buffer to add the object to

getId

public int getId()

getSecret

public SafeBigInt getSecret()

setVerifiers

public void setVerifiers(SafeBigInt verifier,
                         SafeBigInt groupVerifier)

getVerifier

public SafeBigInt getVerifier()

getSignVal

public SafeBigInt getSignVal()

toString

public String toString()

Overrides:

toString in class Object

sign

public SigShare sign(byte[] b)

Create a SigShare and a Verifier for byte[] b
Refer to Shoup pg. 8

Returns:

a sig share with a verifier

sign_using_c

public SigShare sign_using_c(SafeBigInt x,
                             SafeBigInt n,
                             SafeBigInt r,
                             boolean debug)