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Two-way SSL authentication example in C

A simple example program that demonstrates two-way authentication between a client and the server.

There are a couple of things to be noted here:

  1. Hostname verification is not performed. If you want to perform it, you should take a look at this repository.
  2. Don't plugin this code directly into multi-threaded applications, you need to call some additional routines so that OpenSSL routines become reentrant.
  3. You can generate the keys by looking at this gist.

Steps to run the example

Pre-requisities

  • Any decent C compiler
  • OpenSSL development library

Build

make

Server

./openssl server 8888 ./keys/ca/ca_cert.pem ./keys/server/server_cert.pem ./keys/server/private/server_key.pem

Client

./openssl client 127.0.0.1:8888 ./keys/ca/ca_cert.pem ./keys/client/client_cert.pem ./keys/client/private/client_key.pem