1OpenSSL Simple Echo Client/Server 2================================= 3 4This project implements a simple echo client/server. 5 6It is a console application, with command line parameters determining the mode 7of operation (client or server). Start it with no parameters to see usage. 8 9The server code was adapted from the Simple TLS Server on the OpenSSL Wiki. 10The server code was modified to perform the echo function, and client code 11was added to open a connection with the server and to send keyboard input 12to the server. 13 14The new client code illustrates that: 15 16- Connection to the SSL server starts as a standard TCP 'connect'. 17- Once connected with TCP, the client 'upgrades' to SSL using 18 SSL_connect(). 19- When the SSL connection completes, data is sent and received using 20 SSL_write() and SSL_read(). 21- Pretty simple. 22 23The cert.pem and key.pem files included are self signed certificates with the 24"Common Name" of 'localhost'. 25 26Best to create the 'pem' files using an actual hostname. 27
