Laurent, tu ne t'es pas gour? de postit de
?
Le 20 janv. 2014 09:24, "master voip" <voip.batsman at gmail.com> a ?crit :
> Hi
>
> I am running a proxy server which supports signalling and media custom
> encryption based on XOR encryption with a key and prefix base.
>
> Proxy Server side plugin code includes iostream header which listen for
> UDP stream coming into and match the packet size decrypt the stearm with
> the key then pass it to SIP server .
>
> i would like to know which files have to be modified in client side PJSIP
> useragent inorder to send encrypted signalling and media stream ?.
>
> .
>
> Thank you
>
> Part of code in plugin :
>
>
>
> "
> #include <iostream>
> #include <string>
> #include <vector>
> #include <string.h>
> extern "C" { bool initializePlugin(PROXYPluginContainer* pluginManager); }
> typedef std::vector<char> Packet;
> static PROXYPluginContainer* _pPluginManager = 0;
> class XOREncryptor : public PROXYEncryptionPluginBase
> {
> public:
> std::string _key;
> std::string _prefix;
> XOREncryptor()
> {
> for(int i = 0; i < 6; i++)
> _key.push_back((char)(171 + i));
> _prefix = "0000";
> }
> void applyXor(Packet& packet)
> {
> if (packet.empty())
> return;
> //
> // Reserve enough space for the out buffer
> //
> Packet out;
> out.reserve(packet.size());
> std::size_t keyLen = _key.size();
> std::size_t offset = 0;
> //
> // Apply the XOR for each byte
> //
> for (Packet::const_iterator iter = packet.begin(); iter != packet.end();
> iter++)
> {
> if (offset == keyLen)
> offset = 0;
> out.push_back(*iter ^ _key.at(offset));
> offset++;
> }
> packet = out;
> }
> void applyPrefix(Packet& packet)
> {
> //
> // Insert the prefix at the beginning of the packet if it is present
> //
> if (_prefix.empty())
> return;
> Packet out;
> out.reserve(packet.size() + _prefix.size());
> for (std::string::const_iterator iter = _prefix.begin(); iter !=
> _prefix.end(); iter++)
> {
> out.push_back(*iter);
> }
> for (Packet::const_iterator iter = packet.begin(); iter != packet.end();
> iter++)
> {
> out.push_back(*iter);
> }
> packet = out;
> }
> void removePrefix(Packet& packet, std::size_t len)
> {
> if (packet.empty())
> return;
> Packet out;
> std::size_t offset = 0;
> std::string prefix;
> prefix.reserve(_prefix.size());
> out.reserve(len);
> for (Packet::const_iterator iter = packet.begin(); iter != packet.end();
> iter++)
> {
> if (offset < len)
> prefix.push_back(*iter);
> else
> out.push_back(*iter);
>
> offset++;
> }
> if (prefix == _prefix)
> {
> //PLUGIN_LOG_INFO("Removed prefix " << prefix << " prior to
> decryption");
> packet = out;
> }
> else
> {
> //PLUGIN_LOG_WARNING("Prefix is not removed. Collected prefix is " <<
> prefix);
> }
> }
>
> void encryptSIP(Packet& packet)
> {
> applyXor(packet);
> //applyPrefix(packet);
> }
> void decryptSIP(Packet& packet)
> {
> //removePrefix(packet, _prefix.size());
> applyXor(packet);
> }
> void encryptRTP(Packet& packet)
> {
> applyXor(packet);
> applyPrefix(packet);
> }
> void decryptRTP(Packet& packet)
> {
> if (packet.empty() || packet.size() < _prefix.size())
> {
> PLUGIN_LOG_ERROR("XOREncryptor::decryptRTP discarding inadequate size
> packet with " << packet.size() << " bytes.");
> }
> removePrefix(packet, _prefix.size());
> applyXor(packet);
> if (packet.empty())
> return;
> if (((packet[0]>>6)&3) != 2)
> {
> //
> // We had trouble decrypting the RTP packet if it ever gets here
> //
> PLUGIN_LOG_ERROR("XOREncryptor::decryptRTP returned a malformed
> output");
> }
> }
> };"
> "
>
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>
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