Encrypts the contents of a file using AES-256 encryption with a provided key, and saves the encrypted data to a new file.
aes256_encrypt_f({key}, {input_file}, {output_file})
Encrypt the file “data.txt” with the key “mysecretkey” and save the encrypted file as “data_encrypted.txt”
aes256_encrypt_f("mysecretkey", "data.txt", "data_encrypted.txt"); // returns status based on success or failure