README

This was developed on a MAC OSX 10.9 and uses Common Crypto for encryption

Notes: 
- Run the make file to get the client and server programs.
- I could only test the server on loopback but it 'should' work over a normal network.

Server Notes
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1. File has limit of 8MB (Realloc kept messing up my hash and couldn't figure out why :( ) - this can be changed in server.c if needed  
2. Each read from client has a timeout (check code to see why)
3. Usage: server <portno>

Program Flow

1. Create and bind socket - initiateServer()
2. Listen for connections in infinite loop
3. Fork on new connection - processFile()
	4. Create hash (uses SHA256)
	5. Read until no data left (or timeout trigures)
	6. Update hash for every read
	7. Send hash back to client
	8. Use shutdown to prevent further writes
	9. Wait from response from client (5 second timeout)


Client Notes (If using to test)
------------

1. Usage: client <hostname> <portno> <filetoencrypt>
2. File size limit of 8MB
3. Refrain from creating files using dd 'if=/dev/zero ... ' as fread does not work for some reason (use truncate instead)

Program Flow

1. Retrieve hostname and portno and assign file to encrypt
2. Set up socket
3. Connect to host
4. Read file into buffer
5. Send file to server
6. Create local hash of file
7. Read encrypted file from server
8. Compare local and received buffers
9. Send back response to server indicating whether buffers match