Add Default trait to Fe32 (derived)

Author: optout21

src/primitives/gf32.rs

@@ -66,11 +66,14 @@ const CHARS_INV: [i8; 128] = [
 ];
 
 /// An element in GF(32), the finite field containing elements `[0,31]` inclusive.
-#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, Hash)]
 #[repr(transparent)]
 pub struct Fe32(pub(crate) u8);
 
 impl Fe32 {
+    /// The Zero element is 0 numeric (character 'Q')
+    pub const ZERO: Fe32 = Fe32(0);
+
     // These are a little gratuitous for a reference implementation, but it makes me happy to do it.
     /// Numeric value maps to bech32 character: 0 == "q".
     pub const Q: Fe32 = Fe32(0);
@@ -487,6 +490,18 @@ mod tests {
             assert_eq!(fe * Fe32::P, fe) // Fe32::P == Fe32(1)
         }
     }
+
+    #[test]
+    fn default() {
+        assert_eq!(Fe32::default().to_u8(), 0);
+        assert_eq!(Fe32::default(), Fe32::ZERO);
+    }
+
+    #[test]
+    fn const_zero() {
+        assert_eq!(Fe32::ZERO.to_u8(), 0);
+        assert_eq!(Fe32::ZERO.to_char(), 'q');
+    }
 }
 
 #[cfg(kani)]