Micro RFC 3161 Time-Stamp server written in C.
Pierre-Francois Carpentier - copyright © 2019
A demo is accessible here: https://uts-server.kakwalab.ovh/
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:
- A client application sends an hash of the data it wants to time-stamp to a Time-Stamp authority server.
- 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 of like a signature).
- The Time-Stamp authority server returns 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, for example 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 (and dirty) Testing
Here a few steps to quickly try out uts-server, for production setup, please compile civetweb externally and create proper CA and certificates:
# Building with civetweb embedded (will recover civetweb from github). # Note: the BUNDLE_CIVETWEB option is only here for fast testing purpose # The recommended way to deploy uts-server in production is to build civetweb # separatly and to link against it. $ 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