This is a vanilla implementation of server-client RSA encryption service where the communication happens between two clients.

Compilation

• Server (Same command for both Mac and Ubuntu): gcc -o server server.c
• Client (Mac): gcc client.c -o client -lssl -lcrypto -L/usr/local/opt/openssl/lib -I/usr/local/opt/openssl/
• Client (Ubuntu): gcc client.c -o client -lssl -lcrypto

Run

• Server: ./server 8080
• Client1: ./client private1.pem public2.pem 127.0.0.1 8080
• Client2: ./client private2.pem public1.pem 127.0.0.1 8080

Sample Run

• As soon as you connect both the clients to the server, the server will display the message that both the clients have connected.
• In client 1 terminal, enter "Hello, Client 1 here".
• You will see its cipher and its decrypted text in terminal 2.
• Similarly, do this for client 2 "Hello, Client 2 here".
• You will see its cipher and its decrypted text in terminal 1.
• Write "exit" and hit enter in any one of the two terminals, you will see both the clients exit.
• The server will now be ready for accepting two more clients.