From a298344178e53b0e5f9781e5fe73452668f673c4 Mon Sep 17 00:00:00 2001
From: Praveen Perera <praveen@avencera.com>
Date: Mon, 19 Apr 2021 11:31:53 -0400
Subject: [PATCH] Add optional zeroize support

---
 Cargo.toml |  1 +
 src/lib.rs | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index cd4c2aa..4d7b5d8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,6 +46,7 @@ rand_core = "0.4.0"
 unicode-normalization = { version = "=0.1.9", optional = true }
 rand = { version = "0.6.0", optional = true }
 serde = { version = "1.0", default-features = false, optional = true }
+zeroize = {version = "1.2", optional = true}
 
 [dev-dependencies]
 rand = { version = "0.6.0", optional = false }
diff --git a/src/lib.rs b/src/lib.rs
index 79cb52f..51f7226 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -53,6 +53,11 @@ use bitcoin_hashes::{sha256, Hash};
 #[cfg(feature = "std")]
 use unicode_normalization::UnicodeNormalization;
 
+#[cfg(feature = "zeroize")]
+extern crate zeroize;
+#[cfg(feature = "zeroize")]
+use zeroize::Zeroize;
+
 #[macro_use]
 mod internal_macros;
 mod language;
@@ -160,6 +165,13 @@ pub struct Mnemonic {
 	words: [u16; MAX_NB_WORDS],
 }
 
+#[cfg(feature = "zeroize")]
+impl Zeroize for Mnemonic {
+	fn zeroize(&mut self) {
+		self.words.zeroize()
+	}
+}
+
 serde_string_impl!(Mnemonic, "a BIP-39 Mnemonic Code");
 
 impl Mnemonic {