From 0e7a96a267a756e642e102a28a44dd79b9c7df69 Mon Sep 17 00:00:00 2001
From: Kim Altintop <kim.altintop@gmail.com>
Date: Thu, 3 Dec 2020 22:10:52 +0100
Subject: [PATCH] Add Zeroize impl for SigningKey (#34)

* Add Zeroize impl for SigningKey
---
 Cargo.toml         | 1 +
 src/signing_key.rs | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 5de2d3a..cae694e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,7 @@ rand_core = "0.5"
 thiserror = "1"
 curve25519-dalek = "3"
 serde = { version = "1", optional = true, features = ["derive"] }
+zeroize = "1.1"
 
 [dev-dependencies]
 rand = "0.7"
diff --git a/src/signing_key.rs b/src/signing_key.rs
index 77c19a4..9760352 100644
--- a/src/signing_key.rs
+++ b/src/signing_key.rs
@@ -106,6 +106,13 @@ impl From<[u8; 32]> for SigningKey {
     }
 }
 
+impl zeroize::Zeroize for SigningKey {
+    fn zeroize(&mut self) {
+        self.seed.zeroize();
+        self.s.zeroize()
+    }
+}
+
 #[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 struct SerdeHelper([u8; 32]);