Namespace SipLib.Dtls

Classes required to support encryption and decryption of media (audio, video and Real Time Text) using the Datagram Transport Layer Security DTLS specified in RFC 5763 and RFC 5764. The classes in this namespace are used by the RtpChannel class for encrypting and decrypting RTP media data. Users of the SipLib class library do not normally need to use the classes in this namespace.

Classes

DtlsClientUdpTransport

Class for performing the client side of the DTLS handshake for DTLS-SRTP. This class uses a .NET UdpClient to communicate with the DTLS-SRTP server.

This class should be used to perform the DTLS-SRTP handshake only. At the end of the DTLS-SRTP handshake both the client and the server will have exchanged the SRTP keying material. Call the Close() method when the handshake is completed. The Close() method closes the UdpClient object so it is necessary to create a new UdpClient object to communicate with the server for transporting SRTP media packets.

After calling the constructor, call the DoHandshake() method of the DtlsSrtpTransport object to start the DTLS-SRTP handshake process.

DtlsServerUdpTransport

Class for performing the server side of the DTLS handshake for DTLS-SRTP. This class uses a .NET UdpClient to communicate with the DTLS-SRTP client.

This class should be used to perform the DTLS-SRTP handshake only. At the end of the DTLS-SRTP handshake both the client and the server will have exchanged the SRTP keying material. Call the Close() method when the handshake is completed. The Close() method closes the UdpClient object so it is necessary to create a new UdpClient object to communicate with the client for transporting SRTP media packets.

After calling the constructor, call the DoHandshake() method of the DtlsSrtpTransport object to start the DTLS-SRTP handshake process.

DtlsSrtpClient

Class for a DTLS-SRTP handshake client.

DtlsSrtpServer

Class for a DTLS-SRTP handshake server

DtlsSrtpTransport

Class for managing the transport logic for a DTLS SRTP client or a server.

DtlsUtils

This class provides various utility functions for the Datagram Transport Layer Security (DTLS) protocol.

NetConvert

This class provides various static functions for fixing Little-Endian/Big-Endian byte ordering issues.

RTCDtlsFingerprint

Represents a fingerprint of a certificate used to authenticate WebRTC communications.

RawPacket

When using a TransformConnector, a RTP/RTCP packet is represented using RawPacket. RawPacket stores the buffer holding the RTP/RTCP packet, as well as the inner offset and length of RTP/RTCP packet data.

After transformation, data is also stored in RawPacket objects, either the original RawPacket (in place transformation), or a newly created RawPacket.

SrtcpCryptoContext

SRTPCryptoContext class is the core class of SRTP implementation. There can be multiple SRTP sources in one SRTP session. And each SRTP stream has a corresponding SRTPCryptoContext object, identified by SSRC. In this way, different sources can be protected independently.

SrtpPolicy

SrtpPolicy holds the SRTP encryption / authentication policy of a SRTP session.

Author: Bing SU (nova.su@gmail.com)

SrtpTransformEngine

Implementation of the SRTP Transform Engine

SrtpTransformer

SRTPTransformer implements IPacketTransformer and provides implementations for RTP packet to SRTP packet transformation and SRTP packet to RTP packet transformation logic.

It will first find the corresponding SRTPCryptoContext for each packet based on their SSRC and then invoke the context object to perform the transformation and reverse transformation operation.

Interfaces

IDtlsSrtpPeer

Definition of the interface that must be implement by the DtlsSrtpClient and the DtlsSrtpServer

IPacketTransformer

Interface for transforming a non-secure packet.

ITransformEngine

Interface for the transform engine.

Enums

AlertLevelsEnum

Enumeration of the protocol alert levels

AlertTypesEnum

Enumeration of the protocol Alert types