From bf4c310cb400294514ca42994a8c72cf4111e7d9 Mon Sep 17 00:00:00 2001
From: "Neal H. Walfield" <neal@pep.foundation>
Date: Mon, 24 Dec 2018 15:02:05 +0100
Subject: openpgp: Add a function to compare the public bits of two Keys

  - This is made available as Key::public_cmp and not as an
    implementation of Ord::cmp, because Ord::cmp, should it be
    implemented, should also compare the private bits.
---
 openpgp/src/packet/key.rs | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'openpgp')

diff --git a/openpgp/src/packet/key.rs b/openpgp/src/packet/key.rs
index c5a9e663..f31d58aa 100644
--- a/openpgp/src/packet/key.rs
+++ b/openpgp/src/packet/key.rs
@@ -1,6 +1,8 @@
 //! Public key, public subkey, private key and private subkey packets.
 
 use std::fmt;
+use std::mem;
+use std::cmp::Ordering;
 use time;
 
 use Error;
@@ -56,6 +58,33 @@ impl fmt::Display for Key {
     }
 }
 
+impl Key {
+    /// Compares the public bits of two keys.
+    ///
+    /// This returns Ordering::Equal if the public MPIs, version,
+    /// creation time and algorithm of the two `Key`s match.  This
+    /// does not consider the packet's encoding, packet's tag or the
+    /// secret key material.
+    pub fn public_cmp(a: &Self, b: &Self) -> Ordering {
+        match a.mpis.cmp(&b.mpis) {
+            Ordering::Equal => (),
+            o => return o,
+        }
+
+        match a.version.cmp(&b.version) {
+            Ordering::Equal => (),
+            o => return o,
+        }
+
+        match a.creation_time.cmp(&b.creation_time) {
+            Ordering::Equal => (),
+            o => return o,
+        }
+
+        a.pk_algo.cmp(&b.pk_algo)
+    }
+}
+
 impl Key {
     pub(crate) fn new_(creation_time: time::Tm,pk_algo: PublicKeyAlgorithm,
                        mpis: mpis::PublicKey, secret: Option<SecretKey>)
-- 
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