From ac77ca2bfe6d184c13da7ba90e8276ed0fc35765 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Joachim=20Stro=CC=88mbergson?= <joachim@secworks.se>
Date: Mon, 21 May 2018 17:50:37 +0200
Subject: Removed the sbox word mux. Removed ports for sbox access in the
 encipher datapath since it now has its own sboxes.

---
 src/rtl/aes_core.v           | 26 +-------------------------
 src/rtl/aes_encipher_block.v |  3 ---
 2 files changed, 1 insertion(+), 28 deletions(-)

(limited to 'src/rtl')

diff --git a/src/rtl/aes_core.v b/src/rtl/aes_core.v
index 5196a1f..7c5720d 100644
--- a/src/rtl/aes_core.v
+++ b/src/rtl/aes_core.v
@@ -94,7 +94,6 @@ module aes_core(
   wire [3 : 0]   enc_round_nr;
   wire [127 : 0] enc_new_block;
   wire           enc_ready;
-  wire [31 : 0]  enc_sboxw;
 
   reg            dec_next;
   wire [3 : 0]   dec_round_nr;
@@ -107,7 +106,6 @@ module aes_core(
 
   wire [31 : 0]  keymem_sboxw;
 
-  reg [31 : 0]   muxed_sboxw;
   wire [31 : 0]  new_sboxw;
 
 
@@ -124,9 +122,6 @@ module aes_core(
                                .round(enc_round_nr),
                                .round_key(round_key),
 
-                               .sboxw(enc_sboxw),
-                               .new_sboxw(new_sboxw),
-
                                .block(block),
                                .new_block(enc_new_block),
                                .ready(enc_ready)
@@ -166,7 +161,7 @@ module aes_core(
                     );
 
 
-  aes_sbox sbox_inst(.sboxw(muxed_sboxw), .new_sboxw(new_sboxw));
+  aes_sbox sbox_inst(.sboxw(keymem_sboxw), .new_sboxw(new_sboxw));
 
 
   //----------------------------------------------------------------
@@ -206,25 +201,6 @@ module aes_core(
     end // reg_update
 
 
-  //----------------------------------------------------------------
-  // sbox_mux
-  //
-  // Controls which of the encipher datapath or the key memory
-  // that gets access to the sbox.
-  //----------------------------------------------------------------
-  always @*
-    begin : sbox_mux
-      if (init_state)
-        begin
-          muxed_sboxw = keymem_sboxw;
-        end
-      else
-        begin
-          muxed_sboxw = enc_sboxw;
-        end
-    end // sbox_mux
-
-
   //----------------------------------------------------------------
   // encdex_mux
   //
diff --git a/src/rtl/aes_encipher_block.v b/src/rtl/aes_encipher_block.v
index c3e672c..c4440d7 100644
--- a/src/rtl/aes_encipher_block.v
+++ b/src/rtl/aes_encipher_block.v
@@ -49,9 +49,6 @@ module aes_encipher_block(
                           output wire [3 : 0]   round,
                           input wire [127 : 0]  round_key,
 
-                          output wire [31 : 0]  sboxw,
-                          input wire  [31 : 0]  new_sboxw,
-
                           input wire [127 : 0]  block,
                           output wire [127 : 0] new_block,
                           output wire           ready
-- 
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