nxt.crypto

Class SimpleShamirSecretSharing

java.lang.Object

nxt.crypto.SimpleShamirSecretSharing

All Implemented Interfaces:

SecretSharing

public final class SimpleShamirSecretSharing
extends java.lang.Object
implements SecretSharing

Method Summary

Modifier and Type	Method and Description
java.math.BigInteger	combine(SecretShare[] shares, java.math.BigInteger prime) Given the needed number of shares or more, reproduce the original polynomial and extract the secret from its free term.
SecretShare[]	split(java.math.BigInteger secret, int needed, int available, java.math.BigInteger prime, java.util.Random random) Given a secret, split it into "available" shares where providing "needed" shares is enough to reproduce the secret.

Methods inherited from class java.lang.Object

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

Method Detail

split

public SecretShare[] split(java.math.BigInteger secret,
                           int needed,
                           int available,
                           java.math.BigInteger prime,
                           java.util.Random random)

Given a secret, split it into "available" shares where providing "needed" shares is enough to reproduce the secret. All calculations are performed mod p, where p is a large prime number.

Specified by:

split in interface SecretSharing

Parameters:

secret - the secret

needed - the number of shares needed to reproduce it

available - the total number of shares

prime - the prime number

random - the random source

Returns:

the secret shares

combine

public java.math.BigInteger combine(SecretShare[] shares,
                                    java.math.BigInteger prime)

Given the needed number of shares or more, reproduce the original polynomial and extract the secret from its free term. All calculations are performed mod p, where p is a large prime number

Specified by:

combine in interface SecretSharing

Parameters:

shares - the shares represention points over the polynomial

prime - the prime number

Returns:

the original secret reproduced from the free term of the polynomial which passes through these points