This is a fork from TinyDTLS (Version from eclipse) 
The idea is to adapt it for Riot OS (And Contiki) 


Search for the branch for each one:
 - RIOT-Version

In general, when "compiling" (actually configuring), multipels files
are generated but for the constrained OS a big part of them are almost
useless. Plus, currently the Makefile for Contiki are a little deprecated.
And RIOT is not supported yet.

p.d. This a fork from the master branch of eclipse. 
https://git.eclipse.org/r/tinydtls/org.eclipse.tinydtls


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CONTENTS 

This library contains functions and structures that can help
constructing a single-threaded UDP server with DTLS support in
C99. The following components are available:

* dtls
  Basic support for DTLS with pre-shared key mode.

* tests
  The subdirectory tests contains test programs that show how each
  component is used. 

BUILDING

When using the code from the git repository at sourceforge, invoke
'autoreconf' to re-create the configure script. To build for Contiki,
place tinydtls into Contiki's apps directory and call 
  ./configure --with-contiki.

After configuration, invoke make to build the library and associated
test programs. To add tinydtls as Contiki application, drop it into
the apps directory and add the following line to your Makefile:

  APPS += tinydtls/aes tinydtls/sha2 tinydtls/ecc tinydtls