Create a tock environment

src/env/tock.rs

@@ -0,0 +1,43 @@
+use crypto::rng256::TockRng256;
+
+use crate::ctap::hid::ChannelID;
+use crate::ctap::status_code::Ctap2StatusCode;
+use crate::env::{Env, UserPresence};
+
+pub struct TockEnv<CheckUserPresence: Fn(ChannelID) -> Result<(), Ctap2StatusCode>> {
+    rng: TockRng256,
+    check_user_presence: CheckUserPresence,
+}
+
+impl<CheckUserPresence: Fn(ChannelID) -> Result<(), Ctap2StatusCode>> TockEnv<CheckUserPresence> {
+    pub fn new(check_user_presence: CheckUserPresence) -> Self {
+        let rng = TockRng256 {};
+        TockEnv {
+            rng,
+            check_user_presence,
+        }
+    }
+}
+
+impl<CheckUserPresence: Fn(ChannelID) -> Result<(), Ctap2StatusCode>> UserPresence
+    for TockEnv<CheckUserPresence>
+{
+    fn check(&self, cid: ChannelID) -> Result<(), Ctap2StatusCode> {
+        (self.check_user_presence)(cid)
+    }
+}
+
+impl<CheckUserPresence: Fn(ChannelID) -> Result<(), Ctap2StatusCode>> Env
+    for TockEnv<CheckUserPresence>
+{
+    type Rng = TockRng256;
+    type UserPresence = Self;
+
+    fn rng(&mut self) -> &mut Self::Rng {
+        &mut self.rng
+    }
+
+    fn user_presence(&mut self) -> &mut Self::UserPresence {
+        self
+    }
+}