org.eclipse.californium.scandium.dtls

Class ECDHServerKeyExchange

java.lang.Object

org.eclipse.californium.scandium.dtls.AbstractMessage

org.eclipse.californium.scandium.dtls.HandshakeMessage

org.eclipse.californium.scandium.dtls.ServerKeyExchange

org.eclipse.californium.scandium.dtls.ECDHServerKeyExchange

All Implemented Interfaces:

DTLSMessage

Direct Known Subclasses:

EcdhEcdsaServerKeyExchange, EcdhPskServerKeyExchange

public abstract class ECDHServerKeyExchange
extends ServerKeyExchange

/** The server's ephemeral ECDH. See RFC 4492, section 5.4 Server Key Exchange for details regarding the message format. According RFC 8422, 5.1.1. Supported Elliptic Curves Extension only "named curves" are valid, the "prime" and "char2" curve descriptions are deprecated. Also only "UNCOMPRESSED" as point format is valid, the other formats have been deprecated.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	ECDHServerKeyExchange.EcdhData Utility class to keep results of reading the supported group and the encoded point-

Field Summary

Fields inherited from class org.eclipse.californium.scandium.dtls.HandshakeMessage

FRAGMENT_LENGTH_BITS, FRAGMENT_OFFSET_BITS, MESSAGE_HEADER_LENGTH_BYTES, MESSAGE_LENGTH_BITS, MESSAGE_SEQ_BITS, MESSAGE_TYPE_BITS

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ECDHServerKeyExchange(XECDHECryptography.SupportedGroup supportedGroup, byte[] encodedPoint, InetSocketAddress peerAddress) Called when reconstructing the byte array.

Method Summary

Methods

Modifier and Type	Method and Description
byte[]	getEncodedPoint() Get encoded point
protected int	getNamedCurveLength()
XECDHECryptography.SupportedGroup	getSupportedGroup() Get supported group for ECDH.
protected static ECDHServerKeyExchange.EcdhData	readNamedCurve(org.eclipse.californium.elements.util.DatagramReader reader, InetSocketAddress peerAddress)
String	toString()
protected void	updateSignatureForNamedCurve(Signature signature)
protected void	writeNamedCurve(org.eclipse.californium.elements.util.DatagramWriter writer)

Methods inherited from class org.eclipse.californium.scandium.dtls.ServerKeyExchange

getMessageType

Methods inherited from class org.eclipse.californium.scandium.dtls.HandshakeMessage

fragmentChanged, fragmentToByteArray, fromByteArray, fromGenericHandshakeMessage, getContentType, getFragmentLength, getFragmentOffset, getMessageLength, getMessageSeq, getNextHandshakeMessage, getRawMessage, setMessageSeq, setNextHandshakeMessage, size, toByteArray, writeTo

Methods inherited from class org.eclipse.californium.scandium.dtls.AbstractMessage

getPeer

Methods inherited from class java.lang.Object

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

Constructor Detail

ECDHServerKeyExchange

protected ECDHServerKeyExchange(XECDHECryptography.SupportedGroup supportedGroup,
                     byte[] encodedPoint,
                     InetSocketAddress peerAddress)

Called when reconstructing the byte array.

Parameters:

supportedGroup - supported group (named curve)

encodedPoint - the encoded point on the curve (public key).

peerAddress - the IP address and port of the peer this message has been received from or should be sent to

Method Detail

getNamedCurveLength

protected int getNamedCurveLength()

writeNamedCurve

protected void writeNamedCurve(org.eclipse.californium.elements.util.DatagramWriter writer)

readNamedCurve

protected static ECDHServerKeyExchange.EcdhData readNamedCurve(org.eclipse.californium.elements.util.DatagramReader reader,
                                            InetSocketAddress peerAddress)
                                                        throws HandshakeException

Throws:

HandshakeException

updateSignatureForNamedCurve

protected void updateSignatureForNamedCurve(Signature signature)
                                     throws SignatureException

Throws:

SignatureException

getSupportedGroup

public XECDHECryptography.SupportedGroup getSupportedGroup()

Get supported group for ECDH.

Returns:

supported group

getEncodedPoint

public byte[] getEncodedPoint()

Get encoded point

Returns:

encoded point (public key).

toString

public String toString()

Overrides:

toString in class HandshakeMessage