Package org.bouncycastle.crypto.threshold

Class ShamirSecretSplitter

java.lang.Object

org.bouncycastle.crypto.threshold.ShamirSecretSplitter

All Implemented Interfaces:

SecretSplitter

public class ShamirSecretSplitter
extends Object
implements SecretSplitter

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	ShamirSecretSplitter.Algorithm
static enum	ShamirSecretSplitter.Mode

Field Summary

Fields

Modifier and Type	Field	Description
protected int	l	Length of the secret
protected SecureRandom	random

Constructor Summary

Constructors

Constructor	Description
ShamirSecretSplitter(ShamirSecretSplitter.Algorithm algorithm, ShamirSecretSplitter.Mode mode, int l, SecureRandom random)

Method Summary

Modifier and Type	Method	Description
ShamirSplitSecret	resplit(byte[] secret, int m, int n)	Creates secret shares from a given secret.
ShamirSplitSecret	split(int m, int n)	Creates secret shares.
ShamirSplitSecret	splitAround(SecretShare s, int m, int n)	Creates secret shares from a given secret share.

Methods inherited from class java.lang.Object

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

Field Details

l

protected int l

Length of the secret

random

protected SecureRandom random

Constructor Details

ShamirSecretSplitter

public ShamirSecretSplitter(ShamirSecretSplitter.Algorithm algorithm,
 ShamirSecretSplitter.Mode mode,
 int l,
 SecureRandom random)

Method Details

split

public ShamirSplitSecret split(int m,
 int n)

Description copied from interface: SecretSplitter

Creates secret shares. The secret will be divided into shares, where the secret has a length of L bytes.

Specified by:

split in interface SecretSplitter

Parameters:

m - A threshold number of shares

n - Total number of shares

Returns:

An array of byte[][] representing the generated secret shares for m users with l bytes each.

splitAround

public ShamirSplitSecret splitAround(SecretShare s,
 int m,
 int n)
                              throws IOException

Description copied from interface: SecretSplitter

Creates secret shares from a given secret share. The secret will be divided into shares, where the secret has a length of L bytes.

Specified by:

splitAround in interface SecretSplitter

Parameters:

m - A threshold number of shares

n - Total number of shares

Returns:

An array of byte[][] representing the generated secret shares for m users with l bytes each.

Throws:

IOException

resplit

public ShamirSplitSecret resplit(byte[] secret,
 int m,
 int n)

Description copied from interface: SecretSplitter

Creates secret shares from a given secret. The secret will be divided into shares, where the secret has a length of L bytes.

Specified by:

resplit in interface SecretSplitter

Parameters:

m - A threshold number of shares

n - Total number of shares

Returns:

An array of byte[][] representing the generated secret shares for m users with l bytes each.