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authorJoachim StroĢˆmbergson <joachim@secworks.se>2018-08-30 08:49:22 +0200
committerJoachim StroĢˆmbergson <joachim@secworks.se>2018-08-30 08:49:22 +0200
commit58f30c1e67b57e26ade0234107fbfb6f17b8af66 (patch)
treed5b6659cd44960eae6674073101db38a9d3d87b5 /src
parent702c57e301342005ea6f854fbeeb862d78b75360 (diff)
Adding two more pipeline registers in the qr module. Added two more wait cycles.
Diffstat (limited to 'src')
-rw-r--r--src/rtl/chacha_core.v20
-rw-r--r--src/rtl/chacha_qr.v28
2 files changed, 32 insertions, 16 deletions
diff --git a/src/rtl/chacha_core.v b/src/rtl/chacha_core.v
index 32f37f5..6cb1e51 100644
--- a/src/rtl/chacha_core.v
+++ b/src/rtl/chacha_core.v
@@ -82,8 +82,10 @@ module chacha_core(
localparam CTRL_INIT = 3'h1;
localparam CTRL_ROUNDS0 = 3'h2;
localparam CTRL_ROUNDS1 = 3'h3;
- localparam CTRL_FINALIZE = 3'h4;
- localparam CTRL_DONE = 3'h5;
+ localparam CTRL_ROUNDS2 = 3'h4;
+ localparam CTRL_ROUNDS3 = 3'h5;
+ localparam CTRL_FINALIZE = 3'h6;
+ localparam CTRL_DONE = 3'h7;
//----------------------------------------------------------------
@@ -666,6 +668,20 @@ module chacha_core(
CTRL_ROUNDS1:
begin
+ update_state = 1;
+ chacha_ctrl_new = CTRL_ROUNDS2;
+ chacha_ctrl_we = 1;
+ end
+
+ CTRL_ROUNDS2:
+ begin
+ update_state = 1;
+ chacha_ctrl_new = CTRL_ROUNDS3;
+ chacha_ctrl_we = 1;
+ end
+
+ CTRL_ROUNDS3:
+ begin
state_we = 1;
update_state = 1;
qr_ctr_inc = 1;
diff --git a/src/rtl/chacha_qr.v b/src/rtl/chacha_qr.v
index ba68d51..ec29c70 100644
--- a/src/rtl/chacha_qr.v
+++ b/src/rtl/chacha_qr.v
@@ -59,10 +59,10 @@ module chacha_qr(
//----------------------------------------------------------------
reg [31 : 0] a0_reg;
reg [31 : 0] a0_new;
-// reg [31 : 0] a1_reg;
-// reg [31 : 0] a1_new;
-// reg [31 : 0] c0_reg;
-// reg [31 : 0] c0_new;
+ reg [31 : 0] a1_reg;
+ reg [31 : 0] a1_new;
+ reg [31 : 0] c0_reg;
+ reg [31 : 0] c0_new;
//----------------------------------------------------------------
@@ -91,15 +91,15 @@ module chacha_qr(
if (!reset_n)
begin
a0_reg <= 32'h0;
-// a1_reg <= 32'h0;
-// c0_reg <= 32'h0;
+ a1_reg <= 32'h0;
+ c0_reg <= 32'h0;
end
else
begin
a0_reg <= a0_new;
-// a1_reg <= a1_new;
-// c0_reg <= c0_new;
+ a1_reg <= a1_new;
+ c0_reg <= c0_new;
end
end // reg_update
@@ -134,21 +134,21 @@ module chacha_qr(
d1 = {d0[15 : 0], d0[31 : 16]};
c0 = c + d1;
-// c0_new = c0;
+ c0_new = c0;
- b0 = b ^ c0;
+ b0 = b ^ c0_reg;
b1 = {b0[19 : 0], b0[31 : 20]};
a1 = a0_reg + b1;
-// a1_new = a1;
+ a1_new = a1;
- d2 = d1 ^ a1;
+ d2 = d1 ^ a1_reg;
d3 = {d2[23 : 0], d2[31 : 24]};
- c1 = c0 + d3;
+ c1 = c0_reg + d3;
b2 = b1 ^ c1;
b3 = {b2[24 : 0], b2[31 : 25]};
- internal_a_prim = a1;
+ internal_a_prim = a1_reg;
internal_b_prim = b3;
internal_c_prim = c1;
internal_d_prim = d3;