Usage example of AES-CBC with 256-bit keys
// AES256-CBC requires a key of length 32 bytes. static immutable KEY = "abcdefghijklmnopqrstuvwxyz012345"; // AES256-CBC requires an IV of length 16 bytes. static immutable IV = "0123456789ABCDEF"; testAES_IV!(AES256_CBC, KEY, IV);