AES Encryption Program

This project implements the AES-128 Encryption and Decryption in C, supporting different modes of operation. Follow the steps below to run and interact with the program.

How to Run

1. Setting up the Program

1. Open main.c.
2. Enter the key in 128-bit Hex String format (Default: YELLOW SUBMARINE).
3. Initialization Vector (IV) is generated randomly for each encryption, so you have no control over it.
4. The encrypted output file will be saved in the same directory (Default: encrypt.bin).
5. For verification, the same encrypted file will be decrypted (Default: decrypt.bin).

2. Running the Program

1. Ensure that gcc and make are installed on your system.
2. Open a terminal and navigate to the project directory.
3. Run make to build the program.
4. Run the program using ./aes.
5. When prompted:
   • Enter the name of the file you want to encrypt.
   • Select the mode of operation for encryption.
   • Select the mode of operation for decryption.

3. Installing Dependencies

To install gcc and make on Ubuntu:

sudo apt-get update
sudo apt-get install build-essential
sudo apt-get install make

If make command is not working, then execute the program manually by :

gcc -o aes main.c run/prog/utils.c run/prog/algo.c run/prog/enc_dec.c modes/prog/enc/cfb_enc.c modes/prog/dec/cfb_dec.c modes/prog/enc/ofb_enc.c modes/prog/dec/ofb_dec.c modes/prog/enc/ecb_enc.c modes/prog/dec/ecb_dec.c modes/prog/enc/cbc_enc.c modes/prog/dec/cbc_dec.c