Cross platform command line tool to encrypt/decrypt files with AES (ECB or CBC).

Compile with "gcc aes.c sha256.c encrypt.c -Werror -Wall"

The tool can encrypt files and directories and take a user specified key or use the default. The initialization vector in CBC mode is stored with the key in a file. This file cannot be re-created as the IV is completely random, so don't lose this file if in CBC mode (default).

Credit to kokke's Tiny AES and B-con's crypto-algorithms.

NOTICE: This tool was created as a learning experience. While the algorithms used are standardized, it is still possible vulnerabilities remain in the program.

• Build and test on *nix environment
• Add extension to encrypted files
• Add key checksum to encrypted files
• Implement different key sizes
• Rewrite AES to have GPU support, side-channel resistance
• Add other crypto options (twofish, RSA, one-time-pad, viginere?, 3DES?)