Improve usability of agreement::UnparsedPublicKey.

Author: briansmith

src/agreement.rs

@@ -162,11 +162,35 @@ where
     }
 }
 
+impl<B: core::fmt::Debug> core::fmt::Debug for UnparsedPublicKey<B>
+where
+    B: AsRef<[u8]>,
+{
+    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
+        f.debug_struct("UnparsedPublicKey")
+            .field("algorithm", &self.algorithm)
+            .field("bytes", &self.bytes)
+            .finish()
+    }
+}
+
 impl<B: AsRef<[u8]>> UnparsedPublicKey<B> {
     /// Constructs a new `UnparsedPublicKey`.
     pub fn new(algorithm: &'static Algorithm, bytes: B) -> Self {
         Self { algorithm, bytes }
     }
+
+    /// TODO: doc
+    #[inline]
+    pub fn algorithm(&self) -> &'static Algorithm {
+        self.algorithm
+    }
+
+    /// TODO: doc
+    #[inline]
+    pub fn bytes(&self) -> &B {
+        &self.bytes
+    }
 }
 
 /// Performs a key agreement with an ephemeral private key and the given public