feat(deps): update zeroize and use derive macro

Cargo.toml

@@ -46,7 +46,7 @@ default-features = false
 features = ["std"]
 
 [dependencies.zeroize]
-version = "0.5"
+version = "0.6"
 optional = true
 
 [dependencies.serde]

src/bigint.rs

@@ -51,6 +51,14 @@ pub enum Sign {
     Plus,
 }
 
+#[cfg(feature = "zeroize")]
+impl Zeroize for Sign {
+    fn zeroize(&mut self) {
+        // TODO: Figure out how to better clear the sign.
+        *self = Sign::NoSign;
+    }
+}
+
 impl Neg for Sign {
     type Output = Sign;
 
@@ -118,20 +126,12 @@ impl<'de> serde::Deserialize<'de> for Sign {
 
 /// A big signed integer type.
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "zeroize", derive(Zeroize))]
 pub struct BigInt {
     pub(crate) sign: Sign,
     pub(crate) data: BigUint,
 }
 
-#[cfg(feature = "zeroize")]
-impl Zeroize for BigInt {
-    fn zeroize(&mut self) {
-        // TODO: Figure out how to better clear the sign.
-        self.sign = Sign::NoSign;
-        self.data.zeroize();
-    }
-}
-
 /// Return the magnitude of a `BigInt`.
 ///
 /// This is in a private module, pseudo pub(crate)

src/biguint.rs

@@ -48,17 +48,11 @@ use UsizePromotion;
 
 /// A big unsigned integer type.
 #[derive(Clone, Debug)]
+#[cfg_attr(feature = "zeroize", derive(Zeroize))]
 pub struct BigUint {
     pub(crate) data: SmallVec<[BigDigit; VEC_SIZE]>,
 }
 
-#[cfg(feature = "zeroize")]
-impl Zeroize for BigUint {
-    fn zeroize(&mut self) {
-        self.data.zeroize();
-    }
-}
-
 impl PartialEq for BigUint {
     #[inline]
     fn eq(&self, other: &BigUint) -> bool {