Encryption and decryption programs written in C++ to improve my understanding of the 128-bit AES cipher.

• encrypt.cpp - Source file for encryption utility.
• decrypt.cpp - Source file for decryption utility.
• structures.h - Provides the structures and Key Expansion functions for use in the main program files.
• keyfile - Specify the encryption key in this file. Key must be a 128-bit key in hexadecimal format with a space between each hex value, example: 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10
• message.aes - Generated by encryption tool, stores the encrypted message. Read in and decrypted by decryption tool.

If using the g++ compiler you can do:
g++ encrypt.cpp -o encrypt
g++ decrypt.cpp -o decrypt

To run the encryption utility simply do ./encrypt after compilation.
To run the decryption utility simply do ./decrypt after compilation.