a safely passphrase prompt library and application, support Chroma-Hash-like colorhash, use seckey protecte password.
library:
``` extern crate ttyaskpass; use ttyaskpass::askpass;
fn main() {
let pass = askpass::
see examples/readme.rs and ttyaskpass.rs.
application:
env SSH_ASKPASS=ttyaskpass ssh-add </dev/null