File-server

This is one project from Lehigh CSE303 course which enables user to upload and download file in multiple secure methods.

Features:

1. a server listening on certain port so that client can connect it to send and recieve files.
2. a well-defined protocol for client and server so that they can send file fast and correctly.
3. Using md5 to verify, public-private key to encrypt the content of file.
4. Implemented LRU cache on both client and server.

How to run?

##Preparation:

1. Clone the repository.
2. cd to the newly cloned project.
3. Run make in command line to get output file in ./obj64.

About server:

1. To run server, you need to build one folder as root of server.
2. cd to that folder and execute server file with ./.../server. Here, server is the file in ./obj64 folder.
3. There are three parameters: -h help; -l cache basket #; -p port.

About client:

1. To run client, you also need to build one folder as root of client.

2. cd to that folder and execute server file with ./.../client. Here, client is the file in ./obj64 folder.

3. There are six parameters: -h help; -s server IP; -P put file name; -G get file name; -S save file name; `-P port.

4. You can build pem encryption file with:

   openssl genrsa -out private.pem 2048
   openssl rsa -in private.pem -outform PEM -pubout -out public.pem
   

and put them in ./obj64. Program would recognize them and encrypt or decrypt file automatically.

Technology stack

RSA, Openssl, md5, Socket