uts-server/README.rst

uts-server 
==========

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Micro `RFC 3161 Time-Stamp <https://www.ietf.org/rfc/rfc3161.txt>`_ server written in C.

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:Doc:    `Uts-Server documentation on ReadTheDoc <http://uts-server.readthedocs.org/en/latest/>`_
:Dev:    `Uts-Server source code on GitHub <https://github.com/kakwa/uts-server>`_
:License: MIT
:Author:  Pierre-Francois Carpentier - copyright © 2016

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License
-------

Released under the MIT Public License

What is RFC 3161?
-----------------

An RFC 3161 time-stamp is basically a cryptographic signature with a date attached.

Roughly, it works as follow:

1. A client application sends an hash of the data it wants to time-stamp to a Time-Stamp authority server.
2. The Time-Stamp authority server retrieves the current date, concatenates it with the hash and uses its private key to create the time-stamp (kind a like a signature).
3. The Time-Stamp authority server return the generated time-stamp to the client application.

Then a client can verify the piece of data with the time-stamp using the Certificate Authority of the time-stamp key pair (X509 certificates).

It gives a cryptographic proof of a piece of data content, like a file, at a given time.

Some use cases:

* time-stamp log files at rotation time.
* time-stamp file at upload to prove it was delivered in due time or not.

Quick Start
-----------

.. sourcecode:: bash

    # Building with civetweb embedded (will recover civetweb from github).
    $ cmake . -DBUNDLE_CIVETWEB=ON
    $ make
    
    # Create some test certificates.
    $ ./tests/cfg/pki/create_tsa_certs
    
    # Launching the time-stamp server with test configuration in debug mode.
    $ ./uts-server -c tests/cfg/uts-server.cnf -D
    
    # In another shell, launching a time-stamp script on the README.md file.
    $ ./goodies/timestamp-file.sh -i README.rst -u http://localhost:2020 -r -O "-cert";

    # Verify the time-stamp.
    $ openssl ts -verify -in README.rst.tsr -data README.rst -CAfile ./tests/cfg/pki/tsaca.pem

    # Display the time-stamp content.
    $ openssl ts -reply -in README.rst.tsr -text

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.. image:: https://github.com/civetweb/civetweb/blob/658c8d48b3bcdb34338dae1b83167a8d7836e356/resources/civetweb_32x32@2.png?raw=true
    :target: https://github.com/civetweb/civetweb