From 53de684b4ae209516a23325f60f14c375447263e Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Wed, 9 Nov 2016 17:02:54 -0800
Subject: [PATCH] crypto: add `cleanse` function.

---
 lib/crypto/crypto.js | 22 ++++++++++++++++++++++
 package.json         |  2 +-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/lib/crypto/crypto.js b/lib/crypto/crypto.js
index 9918f1ca..01d3c710 100644
--- a/lib/crypto/crypto.js
+++ b/lib/crypto/crypto.js
@@ -514,6 +514,28 @@ crypto.ceq = function ceq(a, b) {
   return r === 1;
 };
 
+/**
+ * A maybe-secure memzero.
+ * @param {Buffer} data
+ */
+
+crypto.cleanse = function cleanse(data) {
+  var ctr = crypto._counter;
+  var i;
+
+  for (i = 0; i < data.length; i++) {
+    data[i] = ctr & 0xff;
+    ctr += i;
+  }
+
+  crypto._counter = ctr >>> 0;
+};
+
+crypto._counter = 0;
+
+if (native)
+  crypto.cleanse = native.cleanse;
+
 /**
  * Build a merkle tree from leaves.
  * @param {Buffer[]} leaves
diff --git a/package.json b/package.json
index fa1d905f..78def5c7 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "elliptic": "6.3.2"
   },
   "optionalDependencies": {
-    "bcoin-native": "0.0.7",
+    "bcoin-native": "0.0.8",
     "leveldown": "1.5.0",
     "secp256k1": "3.2.0",
     "socket.io": "1.4.8",