a safely passphrase prompt library and application, support Chroma-Hash-like colorhash, use seckey protecte password.
library:
```rust extern crate ttyaskpass; use ttyaskpass::askpass;
fn main() {
let pass = askpass::
see readme.rs and ttyaskpass.rs.
application:
bash
env SSH_ASKPASS=ttyaskpass ssh-add </dev/null
and
bash
echo "pinentry-program $(which ttypinentry)" >> $HOME/.gnupg/gpg-agent.conf