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@ -6,7 +6,20 @@
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*/
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package net.java.sip.communicator.impl.protocol.jabber;
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import ch.imvs.sdes4j.srtp.*;
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import java.util.*;
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import net.java.sip.communicator.impl.protocol.jabber.extensions.jingle.*;
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import net.java.sip.communicator.impl.protocol.jabber.jinglesdp.*;
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import net.java.sip.communicator.service.protocol.*;
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import net.java.sip.communicator.service.protocol.media.*;
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import net.java.sip.communicator.util.*;
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import org.jitsi.impl.neomedia.transform.sdes.*;
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import org.jitsi.service.neomedia.*;
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import org.jivesoftware.smack.packet.*;
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/**
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* An implementation of the <tt>CallPeerMediaHandler</tt> abstract class for the
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@ -18,6 +31,13 @@ public abstract class AbstractCallPeerMediaHandlerJabberGTalkImpl
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<T extends AbstractCallPeerJabberGTalkImpl<?,?>>
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extends CallPeerMediaHandler<T>
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{
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/**
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* The <tt>Logger</tt> used by the <tt>CallPeerMediaHandlerJabberImpl</tt>
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* class and its instances for logging output.
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*/
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private static final Logger logger
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= Logger.getLogger(AbstractCallPeerMediaHandlerJabberGTalkImpl.class);
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/**
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* Indicates if the <tt>CallPeer</tt> will support </tt>inputevt</tt>
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* extension (i.e. will be able to be remote-controlled).
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@ -56,4 +76,438 @@ public void setLocalInputEvtAware(boolean enable)
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{
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localInputEvtAware = enable;
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}
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/**
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* Detects and adds ZRTP available encryption method present in the
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* description given in parameter.
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*
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* @param isInitiator True if the local call instance is the initiator of
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* the call. False otherwise.
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* @param description The DESCRIPTION element of the JINGLE element which
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* contains the PAYLOAD-TYPE and (more important here) the ENCRYPTION.
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* @param mediaType The type of media (AUDIO or VIDEO).
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*/
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protected void addZRTPAdvertisedEncryptions(
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boolean isInitiator,
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RtpDescriptionPacketExtension description,
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MediaType mediaType)
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{
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// Conforming to XEP-0167 schema there is 0 or 1 ENCRYPTION element for
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// a given DESCRIPTION.
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EncryptionPacketExtension encryptionPacketExtension
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= description.getFirstChildOfType(
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EncryptionPacketExtension.class);
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if(encryptionPacketExtension != null)
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{
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AccountID accountID
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= getPeer().getProtocolProvider().getAccountID();
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// ZRTP
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ZrtpHashPacketExtension zrtpHashPacketExtension =
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encryptionPacketExtension.getFirstChildOfType(
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ZrtpHashPacketExtension.class);
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if(zrtpHashPacketExtension != null
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&& zrtpHashPacketExtension.getValue() != null
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&& accountID.getAccountPropertyBoolean(
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ProtocolProviderFactory.DEFAULT_ENCRYPTION,
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true)
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&& getPeer().getCall().isSipZrtpAttribute())
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{
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addAdvertisedEncryptionMethod(SrtpControlType.ZRTP);
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}
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}
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}
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/**
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* Detects and adds SDES available encryption method present in the
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* description given in parameter.
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*
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* @param isInitiator True if the local call instance is the initiator of
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* the call. False otherwise.
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* @param description The DESCRIPTION element of the JINGLE element which
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* contains the PAYLOAD-TYPE and (more important here) the ENCRYPTION.
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* @param mediaType The type of media (AUDIO or VIDEO).
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*/
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protected void addSDESAdvertisedEncryptions(
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boolean isInitiator,
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RtpDescriptionPacketExtension description,
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MediaType mediaType)
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{
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// Conforming to XEP-0167 schema there is 0 or 1 ENCRYPTION element for
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// a given DESCRIPTION.
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EncryptionPacketExtension encryptionPacketExtension
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= description.getFirstChildOfType(
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EncryptionPacketExtension.class);
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if(encryptionPacketExtension != null)
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{
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AccountID accountID
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= getPeer().getProtocolProvider().getAccountID();
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// SDES
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if(accountID.getAccountPropertyBoolean(
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ProtocolProviderFactory.SDES_ENABLED,
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false)
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&& accountID.getAccountPropertyBoolean(
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ProtocolProviderFactory.DEFAULT_ENCRYPTION,
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true))
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{
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Map<MediaTypeSrtpControl, SrtpControl> srtpControls
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= getSrtpControls();
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MediaTypeSrtpControl key
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= new MediaTypeSrtpControl(mediaType, SrtpControlType.SDES);
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SrtpControl control = srtpControls.get(key);
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if(control == null)
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{
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control
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= JabberActivator.getMediaService().createSDesControl();
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srtpControls.put(key, control);
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}
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SDesControl tmpSDesControl = (SDesControl) control;
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SrtpCryptoAttribute selectedSdes = selectSdesCryptoSuite(
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isInitiator,
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tmpSDesControl,
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encryptionPacketExtension);
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if(selectedSdes != null)
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{
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//found an SDES answer, remove all other controls
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Iterator<Map.Entry<MediaTypeSrtpControl, SrtpControl>> iter
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= srtpControls.entrySet().iterator();
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while (iter.hasNext())
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{
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Map.Entry<MediaTypeSrtpControl, SrtpControl> entry
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= iter.next();
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MediaTypeSrtpControl mtsc = entry.getKey();
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if ((mtsc.mediaType == mediaType)
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&& (mtsc.srtpControlType != SrtpControlType.SDES))
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{
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entry.getValue().cleanup();
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iter.remove();
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}
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}
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addAdvertisedEncryptionMethod(SrtpControlType.SDES);
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}
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else
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{
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control.cleanup();
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srtpControls.remove(key);
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}
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}
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}
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// If we were initiating the encryption, and the remote peer does not
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// manage it, then we must remove the unusable SDES srtpControl.
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else if(isInitiator)
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{
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AccountID accountID
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= getPeer().getProtocolProvider().getAccountID();
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// SDES
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if(accountID.getAccountPropertyBoolean(
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ProtocolProviderFactory.SDES_ENABLED,
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false)
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&& accountID.getAccountPropertyBoolean(
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ProtocolProviderFactory.DEFAULT_ENCRYPTION,
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true))
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{
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Map<MediaTypeSrtpControl, SrtpControl> srtpControls
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= getSrtpControls();
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MediaTypeSrtpControl key
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= new MediaTypeSrtpControl(mediaType, SrtpControlType.SDES);
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SrtpControl control = srtpControls.get(key);
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if(control != null)
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{
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control.cleanup();
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srtpControls.remove(key);
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}
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}
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}
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}
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/**
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* Returns the selected SDES crypto suite selected.
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*
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* @param isInitiator True if the local call instance is the initiator of
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* the call. False otherwise.
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* @param sDesControl The SDES based SRTP MediaStream encryption
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* control.
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* @param encryptionPacketExtension The ENCRYPTION element received from the
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* remote peer. This may contain the SDES crypto suites available for the
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* remote peer.
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*
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* @return The selected SDES crypto suite supported by both the local and
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* the remote peer. Or null, if there is no crypto suite supported by both
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* of the peers.
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*/
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protected SrtpCryptoAttribute selectSdesCryptoSuite(
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boolean isInitiator,
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SDesControl sDesControl,
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EncryptionPacketExtension encryptionPacketExtension)
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{
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List<CryptoPacketExtension> cryptoPacketExtensions =
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encryptionPacketExtension.getCryptoList();
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Vector<SrtpCryptoAttribute> peerAttributes
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= new Vector<SrtpCryptoAttribute>(cryptoPacketExtensions.size());
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for(int i = 0; i < cryptoPacketExtensions.size(); ++i)
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{
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peerAttributes.add(
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cryptoPacketExtensions.get(i).toSrtpCryptoAttribute());
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}
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if(peerAttributes == null)
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{
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return null;
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}
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if(isInitiator)
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{
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return sDesControl.initiatorSelectAttribute(peerAttributes);
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}
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else
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{
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return sDesControl.responderSelectAttribute(peerAttributes);
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}
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}
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/**
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* Returns if the remote peer supports ZRTP.
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*
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* @param encryptionPacketExtension The ENCRYPTION element received from
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* the remote peer. This may contain the ZRTP acket element for the remote
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* peer.
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*
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* @return True if the remote peer supports ZRTP. False, otherwise.
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*/
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protected boolean isRemoteZrtpCapable(
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EncryptionPacketExtension encryptionPacketExtension)
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{
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List<? extends PacketExtension> packetExtensions =
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encryptionPacketExtension.getChildExtensions();
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for(int i = 0; i < packetExtensions.size(); ++i)
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{
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if(packetExtensions.get(i) instanceof ZrtpHashPacketExtension)
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{
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return true;
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}
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}
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return false;
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}
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/**
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* Sets ZRTP element to the ENCRYPTION element of the DESCRIPTION for a
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* given media.
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*
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* @param mediaType The type of media we are modifying the DESCRIPTION to
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* integrate the ENCRYPTION element.
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* @param description The element containing the media DESCRIPTION and its
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* encryption.
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* @param remoteDescription The element containing the media DESCRIPTION and
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* its encryption for the remote peer. Null, if the local peer is the
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* initiator of the call.
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*
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* @return True if the ZRTP element has been added to encryption. False,
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* otherwise.
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*/
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protected boolean setZrtpEncryptionToDescription(
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MediaType mediaType,
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RtpDescriptionPacketExtension description,
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RtpDescriptionPacketExtension remoteDescription)
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{
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boolean isRemoteZrtpCapable = (remoteDescription == null);
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if(remoteDescription != null)
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{
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// Conforming to XEP-0167 schema there is 0 or 1 ENCRYPTION
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// element for a given DESCRIPTION.
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EncryptionPacketExtension remoteEncryption
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= remoteDescription.getFirstChildOfType(
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EncryptionPacketExtension.class);
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if(remoteEncryption != null
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&& isRemoteZrtpCapable(remoteEncryption))
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{
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isRemoteZrtpCapable = true;
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}
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}
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if(getPeer().getProtocolProvider().getAccountID()
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.getAccountPropertyBoolean(
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ProtocolProviderFactory.DEFAULT_ENCRYPTION,
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true)
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&& getPeer().getCall().isSipZrtpAttribute()
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&& isRemoteZrtpCapable)
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{
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Map<MediaTypeSrtpControl, SrtpControl> srtpControls
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= getSrtpControls();
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MediaTypeSrtpControl key
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= new MediaTypeSrtpControl(mediaType, SrtpControlType.ZRTP);
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SrtpControl control = srtpControls.get(key);
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if(control == null)
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{
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control = JabberActivator.getMediaService().createZrtpControl();
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srtpControls.put(key, control);
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}
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String helloHash[] = ((ZrtpControl)control).getHelloHashSep();
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if(helloHash != null && helloHash[1].length() > 0)
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{
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ZrtpHashPacketExtension hash = new ZrtpHashPacketExtension();
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hash.setVersion(helloHash[0]);
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hash.setValue(helloHash[1]);
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EncryptionPacketExtension encryption
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= description.getFirstChildOfType(
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EncryptionPacketExtension.class);
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if(encryption == null)
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{
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encryption = new EncryptionPacketExtension();
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description.addChildExtension(encryption);
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}
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encryption.addChildExtension(hash);
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return true;
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}
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}
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return false;
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}
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/**
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* Sets SDES element(s) to the ENCRYPTION element of the DESCRIPTION for a
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* given media.
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*
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* @param mediaType The type of media we are modifying the DESCRIPTION to
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* integrate the ENCRYPTION element.
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* @param description The element containing the media DESCRIPTION and its
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* encryption.
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* @param remoteDescription The element containing the media DESCRIPTION and
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* its encryption for the remote peer. Null, if the local peer is the
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* initiator of the call.
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*
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* @return True if the crypto element has been added to encryption. False,
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* otherwise.
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*/
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protected boolean setSDesEncryptionToDescription(
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MediaType mediaType,
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RtpDescriptionPacketExtension localDescription,
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RtpDescriptionPacketExtension remoteDescription)
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{
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AccountID accountID = getPeer().getProtocolProvider().getAccountID();
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// check if SDES and encryption is enabled at all
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if(accountID.getAccountPropertyBoolean(
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ProtocolProviderFactory.SDES_ENABLED,
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false)
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&& accountID.getAccountPropertyBoolean(
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ProtocolProviderFactory.DEFAULT_ENCRYPTION,
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true))
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{
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// get or create the control
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Map<MediaTypeSrtpControl, SrtpControl> srtpControls
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= getSrtpControls();
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MediaTypeSrtpControl key
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= new MediaTypeSrtpControl(mediaType, SrtpControlType.SDES);
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SrtpControl control = srtpControls.get(key);
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if (control == null)
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{
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control = JabberActivator.getMediaService().createSDesControl();
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srtpControls.put(key, control);
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}
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// set the enabled ciphers suites
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SDesControl sdcontrol = (SDesControl) control;
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String ciphers
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= accountID.getAccountPropertyString(
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ProtocolProviderFactory.SDES_CIPHER_SUITES);
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if (ciphers == null)
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{
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ciphers =
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JabberActivator.getResources().getSettingsString(
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SDesControl.SDES_CIPHER_SUITES);
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}
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|
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sdcontrol.setEnabledCiphers(Arrays.asList(ciphers.split(",")));
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|
|
// act as initiator
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|
|
if (remoteDescription == null)
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|
|
{
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|
|
EncryptionPacketExtension localEncryption
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|
|
= localDescription.getFirstChildOfType(
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|
|
EncryptionPacketExtension.class);
|
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|
|
if(localEncryption == null)
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|
|
{
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|
|
localEncryption = new EncryptionPacketExtension();
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|
|
localDescription.addChildExtension(localEncryption);
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|
|
}
|
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|
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|
|
for(SrtpCryptoAttribute ca:
|
|
|
|
|
sdcontrol.getInitiatorCryptoAttributes())
|
|
|
|
|
{
|
|
|
|
|
CryptoPacketExtension crypto
|
|
|
|
|
= new CryptoPacketExtension(ca);
|
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|
|
|
localEncryption.addChildExtension(crypto);
|
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|
|
}
|
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|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
// act as responder
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
// Conforming to XEP-0167 schema there is 0 or 1 ENCRYPTION
|
|
|
|
|
// element for a given DESCRIPTION.
|
|
|
|
|
EncryptionPacketExtension remoteEncryption
|
|
|
|
|
= remoteDescription.getFirstChildOfType(
|
|
|
|
|
EncryptionPacketExtension.class);
|
|
|
|
|
if(remoteEncryption != null)
|
|
|
|
|
{
|
|
|
|
|
SrtpCryptoAttribute selectedSdes = selectSdesCryptoSuite(
|
|
|
|
|
false,
|
|
|
|
|
sdcontrol,
|
|
|
|
|
remoteEncryption);
|
|
|
|
|
|
|
|
|
|
if(selectedSdes != null)
|
|
|
|
|
{
|
|
|
|
|
EncryptionPacketExtension localEncryption
|
|
|
|
|
= localDescription.getFirstChildOfType(
|
|
|
|
|
EncryptionPacketExtension.class);
|
|
|
|
|
if(localEncryption == null)
|
|
|
|
|
{
|
|
|
|
|
localEncryption = new EncryptionPacketExtension();
|
|
|
|
|
localDescription.addChildExtension(localEncryption);
|
|
|
|
|
}
|
|
|
|
|
CryptoPacketExtension crypto
|
|
|
|
|
= new CryptoPacketExtension(selectedSdes);
|
|
|
|
|
localEncryption.addChildExtension(crypto);
|
|
|
|
|
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
// none of the offered suites match, destroy the sdes
|
|
|
|
|
// control
|
|
|
|
|
sdcontrol.cleanup();
|
|
|
|
|
srtpControls.remove(key);
|
|
|
|
|
logger.warn(
|
|
|
|
|
"Received unsupported sdes crypto attribute");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
else
|
|
|
|
|
{
|
|
|
|
|
// peer doesn't offer any SDES attribute, destroy the sdes
|
|
|
|
|
// control
|
|
|
|
|
sdcontrol.cleanup();
|
|
|
|
|
srtpControls.remove(key);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
Vincent Lucas
13 years ago