ch.epfl.dedis.lib.darc

Class SignerEd25519

java.lang.Object

ch.epfl.dedis.lib.darc.SignerEd25519

All Implemented Interfaces:

Signer

public class SignerEd25519
extends Object
implements Signer

Nested Class Summary

Nested classes/interfaces inherited from interface ch.epfl.dedis.lib.darc.Signer

Signer.SignRequestRejectedException

Constructor Summary

Constructors

Constructor and Description
SignerEd25519() Constructor for signer.
SignerEd25519(byte[] data) Creates a new signer from a slice of bytes.

Method Summary

Modifier and Type	Method and Description
Identity	getIdentity() Creates an identity of the signer.
Scalar	getPrivate() Returns the private key of the signer, or throws a NoPrivateKey exception.
Point	getPublic() Returns the public key of the signer or throws a NoPublicKey exception.
byte[]	serialize() Returns an array of bytes representing the signer.
byte[]	sign(byte[] msg) Signs the sha256 hash of the message.

Methods inherited from class java.lang.Object

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

Constructor Detail

SignerEd25519

public SignerEd25519()

Constructor for signer.

SignerEd25519

public SignerEd25519(byte[] data)

Creates a new signer from a slice of bytes. This must correspond to what Ed25519.prime_order.toBytes() returns.

Parameters:

data - a public key in byte form

Method Detail

sign

public byte[] sign(byte[] msg)

Signs the sha256 hash of the message. It must return an array of bytes that can be verified by the corresponding identity-implementation.

Specified by:

sign in interface Signer

Parameters:

msg - the message

Returns:

the signature

getPrivate

public Scalar getPrivate()

Returns the private key of the signer, or throws a NoPrivateKey exception.

Specified by:

getPrivate in interface Signer

Returns:

the private key

getPublic

public Point getPublic()

Returns the public key of the signer or throws a NoPublicKey exception.

Specified by:

getPublic in interface Signer

Returns:

the public key

getIdentity

public Identity getIdentity()

Creates an identity of the signer.

Specified by:

getIdentity in interface Signer

Returns:

an identity

serialize

public byte[] serialize()
                 throws IOException

Returns an array of bytes representing the signer. The first byte must indicate the type.

Specified by:

serialize in interface Signer

Returns:

the serialised signer

Throws:

IOException - if something went wrong with I/O