Decrypt will take in a key and a cipherHex (hex representation of the ciphertext) and decrypt it.

DecryptReader will return a reader that will decrypt data from the provided reader and give the user a way to read that data as it if was not encrypted.

Encrypt will take in a key and plaintext and return a hex representation of the encrypted value.

EncryptWriter will return a writer that will write encrypted data to the original writer.