Updates the prompt receiver to take in the in and out files from arguments.
The default function uses stdin and stdout.
Fixed a typo in comment from "directiory" to "directory".
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
The logic to retrieve passphrase is generic and may be used by directly by clients.
Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)