ch.epfl.dedis.skipchain

Class ForwardLink

java.lang.Object

ch.epfl.dedis.skipchain.ForwardLink

public class ForwardLink
extends Object

A forwardlink represents a signed proof that a future block has been accepted by the set of nodes of the current block.

Constructor Summary

Constructors

Constructor and Description
ForwardLink(byte[] buf)
ForwardLink(com.google.protobuf.ByteString bs)
ForwardLink(SkipchainProto.ForwardLink fl)

Method Summary

Modifier and Type	Method and Description
ByzcoinSig	getByzcoinSig()
SkipblockId	getFrom()
Roster	getNewRoster()
SkipblockId	getTo()
byte[]	hash()
boolean	isEmpty()
boolean	verify(List<Point> publics) Verifies whether the signature is correctly signed by the given public keys.

Methods inherited from class java.lang.Object

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

Constructor Detail

ForwardLink

public ForwardLink(SkipchainProto.ForwardLink fl)

ForwardLink

public ForwardLink(byte[] buf)
            throws com.google.protobuf.InvalidProtocolBufferException

Throws:

com.google.protobuf.InvalidProtocolBufferException

ForwardLink

public ForwardLink(com.google.protobuf.ByteString bs)
            throws com.google.protobuf.InvalidProtocolBufferException

Throws:

com.google.protobuf.InvalidProtocolBufferException

Method Detail

getFrom

public SkipblockId getFrom()
                    throws CothorityCryptoException

Returns:

the block where this link originates.

Throws:

CothorityCryptoException - if there's a problem with the cryptography

getTo

public SkipblockId getTo()
                  throws CothorityCryptoException

Returns:

the block where this link points to.

Throws:

CothorityCryptoException - if there's a problem with the cryptography

getNewRoster

public Roster getNewRoster()
                    throws URISyntaxException

Returns:

the new roster of the 'to' block. If the roster of 'to' and 'from' are the same, this returns null.

Throws:

URISyntaxException - if the roster in the forward link has a problem

getByzcoinSig

public ByzcoinSig getByzcoinSig()

Returns:

the byzcoin signature on the concatenated 'from', 'to', and 'newRoster', if present.

verify

public boolean verify(List<Point> publics)

Verifies whether the signature is correctly signed by the given public keys.

Parameters:

publics - is the list of public keys used to sign the forward link.

Returns:

true if the signature is ok.

isEmpty

public boolean isEmpty()

Returns:

if the From or To fields are missing.

hash

public byte[] hash()

Returns:

the digest of the forward-link