public override void ProcessServerExtensions(IDictionary clientExtensions)
{
base.ProcessServerExtensions(clientExtensions);
// set to some reasonable default value
int chosenProfile = SrtpProtectionProfile.SRTP_AES128_CM_HMAC_SHA1_80;
UseSrtpData clientSrtpData = TlsSRTPUtils.GetUseSrtpExtension(clientExtensions);
foreach (int profile in clientSrtpData.ProtectionProfiles)
{
switch (profile)
{
case SrtpProtectionProfile.SRTP_AES128_CM_HMAC_SHA1_32:
case SrtpProtectionProfile.SRTP_AES128_CM_HMAC_SHA1_80:
case SrtpProtectionProfile.SRTP_NULL_HMAC_SHA1_32:
case SrtpProtectionProfile.SRTP_NULL_HMAC_SHA1_80:
chosenProfile = profile;
break;
}
}
// server chooses a mutually supported SRTP protection profile
// http://tools.ietf.org/html/draft-ietf-avt-dtls-srtp-07#section-4.1.2
int[] protectionProfiles = { chosenProfile };
// server agrees to use the MKI offered by the client
clientSrtpData = new UseSrtpData(protectionProfiles, clientSrtpData.Mki);
}
public override void ProcessClientExtensions(IDictionary clientExtensions)
{
base.ProcessClientExtensions(clientExtensions);
var useSrtpData = TlsSRTPUtils.GetUseSrtpExtension(clientExtensions);
var protectionProfiles = useSrtpData.ProtectionProfiles;
ChosenSrtpProtectionProfile = DtlsUtils.ChooseSrtpProtectionProfile(SrtpConfig.ProtectionProfiles, protectionProfiles);
}
public override IDictionary GetServerExtensions()
{
var extensions = base.GetServerExtensions() ?? new Dictionary <int, byte[]>();
if (TlsSRTPUtils.GetUseSrtpExtension(extensions) == null)
{
TlsSRTPUtils.AddUseSrtpExtension(extensions, new UseSrtpData(new int[] { ChosenSrtpProtectionProfile }, TlsUtilities.EmptyBytes));
}
return(extensions);
}
public override IDictionary GetServerExtensions()
{
Hashtable serverExtensions = (Hashtable)base.GetServerExtensions();
if (TlsSRTPUtils.GetUseSrtpExtension(serverExtensions) == null)
{
if (serverExtensions == null)
{
serverExtensions = new Hashtable();
}
TlsSRTPUtils.AddUseSrtpExtension(serverExtensions, serverSrtpData);
}
return(serverExtensions);
}
public override IDictionary GetClientExtensions()
{
var clientExtensions = base.GetClientExtensions();
if (TlsSRTPUtils.GetUseSrtpExtension(clientExtensions) == null)
{
if (clientExtensions == null)
{
clientExtensions = new Hashtable();
}
TlsSRTPUtils.AddUseSrtpExtension(clientExtensions, clientSrtpData);
}
return(clientExtensions);
}
public override IDictionary GetClientExtensions()
{
var clientExtensions = base.GetClientExtensions();
if (TlsSRTPUtils.GetUseSrtpExtension(clientExtensions) == null)
{
if (clientExtensions == null)
{
clientExtensions = new Dictionary <int, byte[]>();
}
TlsSRTPUtils.AddUseSrtpExtension(clientExtensions, new UseSrtpData(SrtpConfig.ProtectionProfiles.ToArray(), TlsUtilities.EmptyBytes));
}
clientExtensions[ExtensionType.renegotiation_info] = new byte[] { 0 };
return(clientExtensions);
}