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+---
+title: "My first Rust crate"
+description: "A command-line application and Rust library to compute the WPA-PSK of a Wi-Fi SSID and passphrase."
+published: 2022-01-03
+---
+
+Recently I decided to give Rust another try -- if only to compare it to Haskell.
+After reading through the decent documentation, especially [*the book*](https://doc.rust-lang.org/book/), I felt prepared to write some remotely useful application: a command-line application to compute the WPA pre-shared key of a Wi-Fi from its SSID and passphrase.
+
+Why?
+Because I needed to manually connect to some wireless networks with *special* and sometimes downright *invalid* SSIDs and passphrases.
+Of course, the popular [wpa_supplicant](https://hostap.epitest.fi/wpa_supplicant/) comes with a similar tool, `wpa_passphrase(8)`.
+But where's the fun in that?
+
+So here it is: my very first Rust crate, `wpa-psk`, on [crates.io](https://crates.io/crates/wpa-psk/0.1.0) and [docs.rs](https://docs.rs/wpa-psk/0.1.0/wpa_psk/).
+
+The command-line interface looks like this:
+
+    $ wpa-psk "123abcABC.,-" "456defDEF *<:D"
+    0x8a366e5bc51cd5d8fbbeffacc5f1af23fac30e3ac93cdcc368fafbbf63a1085c
+    
+    $ wpa-psk --force "bar" "2short"
+    0xcb5de4e4d23b2ab0bf5b9ba0fe8132c1e2af3bb52298ec801af8ad520cea3437
+
+And the Rust interface looks like this:
+
+    let ssid = Ssid::try_from("home")?;
+    let passphrase = Passphrase::try_from("0123-4567-89")?;
+    let psk = wpa_psk(&ssid, &passphrase);
+    assert_eq!(
+        bytes_to_hex(&psk),
+        "150c047b6fad724512a17fa431687048ee503d14c1ea87681d4f241beb04f5ee"
+    );
+
+Note the validating newtypes `Ssid` and `Passphrase`.
+I like that.
+Feels like Haskell :)