From 462c86f8f897448e45fa8b2e21a25c04d5c7dafd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joachim=20Stro=CC=88mbergson?= <joachim@secworks.se>
Date: Tue, 11 Dec 2018 14:40:28 +0100
Subject: Zeroisation of wrapper key registers. Adding reset of key_loaded
 register.

---
 src/rtl/keywrap.v | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/rtl/keywrap.v')

diff --git a/src/rtl/keywrap.v b/src/rtl/keywrap.v
index 02c20fc..36e95bf 100644
--- a/src/rtl/keywrap.v
+++ b/src/rtl/keywrap.v
@@ -270,6 +270,12 @@ module keywrap #(parameter ADDR_BITS = 13)
           if (a1_we)
             a1_reg <= write_data;
 
+          if (zeroise_reg)
+            begin
+              for (i = 0 ; i < 8 ; i = i + 1)
+                key_reg[i] <= 32'h0;
+            end
+
           if (key_we)
             key_reg[address[2 : 0]] <= write_data;
 
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