skypeopensource2

First in world self-made client to Skype Network based on reversing original Skype 5.5 client.

For now, only receiving and sending messages are supported.

Try to compile it with Visual Studio 2010 and test by youself or use already compiled binaries.

License

LGPL 3.0

A commercial license is also avaiable on request.

Known problems (added 2016-09-05)

Load contact list function stop working

Microsoft-Skype do something very weird with contact-list event servers. Like disable it for all users. I try to login using latests 7.27.66.101 skype version for windows with empty profile and dont get back my contact list at all. Hm... But, anyway, its okay. This is format for contact list file (contacts.txt) used in my app, just put it in same dir and add yours skypeusers manually:

u/skypeuser1

u/skypeuser2

u/skypeuser3

u/skypeuser4

u/skypeuser5

And so one.

Issue Statements (added 2016-09-04)

The README should clearly state:

whether or not this client is a complete re-implementation
whether or not it includes disassembled code from the other Skype clients
whether or not it is a clean-room reverse-engineered code, like Wine/ReactOS
why the specified license is valid and legal to use for the project
what are the legal complications, if any, to developing the project and to using it personally or commercially

Reply on issues

whether or not this client is a complete re-implementation

Yes. It's a complete re-implementation of proprietary Skype Network protocol.

whether or not it includes disassembled code from the other Skype clients

Well, maybe a little :) unpack-4142.c and pack-4142.c are HexRays decompiled code and should be rewritten but I don't have time for this now.

whether or not it is a clean-room reverse-engineered code, like Wine/ReactOS

No. Not clean room, not Chinese wall.

why the specified license is valid and legal to use for the project

It's my own code, I write it, I am the author of most code and I hold all copyright rights.

Well, except some login pieces (skyauth3/skype_login.c) which are copyrighted by Sean O'Neil from VEST Corporation in 2009 and RC4 reversing and implementation (skype_rc4.c/skype_rc4.h) also by Sean O'Neil.

what are the legal complications, if any, to developing the project and to using it personally or commercially

The pack-4142.c/unpack41-42.c mentioned above.
Also, it contains MIRACL for RSA and big numbers multiply arithmetics.

MIRACL Cryptographic SDK: Multiprecision Integer and Rational Arithmetic Cryptographic Library is a C software library that is widely regarded by developers as the gold standard open source SDK for elliptic curve cryptography (ECC). http://miracl.com https://github.com/miracl/MIRACL

For commercial usage and license send me an e-mail to skypeopensource@gmail.com

Links

Protocol brief overview: http://skype-open-source2.blogspot.ru/2016/06/skype-protocol-dumps.html

Release post: http://skype-open-source2.blogspot.ru/2016/09/first-in-world-skype-network-compatible.html

Binaries: http://epycs.ru/files/EpycsMessenger2_20160901.zip http://yadi.sk/d/xvKhmImdugThn

Sources (same as on GitHub here): http://epycs.ru/files/EpycsMessenger2_20160901_src.zip http://yadi.sk/d/V_IWJT-fugvND

denis-v-kashuba/skypeopensource2