From e9bac43cad31e2040484dff16c39e03702a3d8ca Mon Sep 17 00:00:00 2001
From: Heiko Schaefer <heiko@schaefer.name>
Date: Tue, 31 May 2022 00:06:13 +0200
Subject: [PATCH] Implement touch_required() for TouchPolicy

---
 openpgp-card/src/card_do.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/openpgp-card/src/card_do.rs b/openpgp-card/src/card_do.rs
index 303ab3c..a55dc46 100644
--- a/openpgp-card/src/card_do.rs
+++ b/openpgp-card/src/card_do.rs
@@ -316,6 +316,7 @@ impl Display for UIF {
 ///
 /// Touch policies were introduced in YubiKey Version 4.2.0 with modes ON, OFF and FIXED.
 /// YubiKey Version >= 5.2.1 added support for modes CACHED and CACHED_FIXED.
+#[derive(Eq, PartialEq)]
 #[non_exhaustive]
 pub enum TouchPolicy {
     Off,
@@ -326,6 +327,17 @@ pub enum TouchPolicy {
     Unknown(u8),
 }
 
+impl TouchPolicy {
+    /// Returns "true" if this TouchPolicy (probably) requires touch confirmation.
+    ///
+    /// Note: When the Policy is set to `Cached` or `CachedFixed`, there is no way to be sure if a
+    /// previous touch confirmation is still valid (touch confirmations are valid for 15s, in
+    /// Cached mode)
+    pub fn touch_required(&self) -> bool {
+        !matches!(self, Self::Off)
+    }
+}
+
 impl Display for TouchPolicy {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         match self {