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-rw-r--r--src/rtl/sha256_core.v199
1 files changed, 106 insertions, 93 deletions
diff --git a/src/rtl/sha256_core.v b/src/rtl/sha256_core.v
index 6553aab..95ad28b 100644
--- a/src/rtl/sha256_core.v
+++ b/src/rtl/sha256_core.v
@@ -89,9 +89,10 @@ module sha256_core(
localparam SHA256_ROUNDS = 63;
- localparam CTRL_IDLE = 0;
- localparam CTRL_ROUNDS = 1;
- localparam CTRL_DONE = 2;
+ localparam CTRL_IDLE = 0;
+ localparam CTRL_ROUNDS0 = 1;
+ localparam CTRL_ROUNDS1 = 2;
+ localparam CTRL_DONE = 3;
//----------------------------------------------------------------
@@ -133,6 +134,9 @@ module sha256_core(
reg [31 : 0] H7_new;
reg H_we;
+ reg [31 : 0] t1_reg;
+ reg [31 : 0] t2_reg;
+
reg [5 : 0] t_ctr_reg;
reg [5 : 0] t_ctr_new;
reg t_ctr_we;
@@ -213,28 +217,32 @@ module sha256_core(
begin : reg_update
if (!reset_n)
begin
- a_reg <= 32'h00000000;
- b_reg <= 32'h00000000;
- c_reg <= 32'h00000000;
- d_reg <= 32'h00000000;
- e_reg <= 32'h00000000;
- f_reg <= 32'h00000000;
- g_reg <= 32'h00000000;
- h_reg <= 32'h00000000;
- H0_reg <= 32'h00000000;
- H1_reg <= 32'h00000000;
- H2_reg <= 32'h00000000;
- H3_reg <= 32'h00000000;
- H4_reg <= 32'h00000000;
- H5_reg <= 32'h00000000;
- H6_reg <= 32'h00000000;
- H7_reg <= 32'h00000000;
- digest_valid_reg <= 0;
- t_ctr_reg <= 6'b000000;
+ a_reg <= 32'h0;
+ b_reg <= 32'h0;
+ c_reg <= 32'h0;
+ d_reg <= 32'h0;
+ e_reg <= 32'h0;
+ f_reg <= 32'h0;
+ g_reg <= 32'h0;
+ h_reg <= 32'h0;
+ H0_reg <= 32'h0;
+ H1_reg <= 32'h0;
+ H2_reg <= 32'h0;
+ H3_reg <= 32'h0;
+ H4_reg <= 32'h0;
+ H5_reg <= 32'h0;
+ H6_reg <= 32'h0;
+ H7_reg <= 32'h0;
+ t1_reg <= 32'h0;
+ t2_reg <= 32'h0;
+ digest_valid_reg <= 1'h0;
+ t_ctr_reg <= 6'h0;
sha256_ctrl_reg <= CTRL_IDLE;
end
else
begin
+ t1_reg <= t1;
+ t2_reg <= t2;
if (a_h_we)
begin
@@ -309,19 +317,19 @@ module sha256_core(
//----------------------------------------------------------------
always @*
begin : digest_logic
- H0_new = 32'h00000000;
- H1_new = 32'h00000000;
- H2_new = 32'h00000000;
- H3_new = 32'h00000000;
- H4_new = 32'h00000000;
- H5_new = 32'h00000000;
- H6_new = 32'h00000000;
- H7_new = 32'h00000000;
- H_we = 0;
+ H0_new = 32'h0;
+ H1_new = 32'h0;
+ H2_new = 32'h0;
+ H3_new = 32'h0;
+ H4_new = 32'h0;
+ H5_new = 32'h0;
+ H6_new = 32'h0;
+ H7_new = 32'h0;
+ H_we = 1'h0;
if (digest_init)
begin
- H_we = 1;
+ H_we = 1'h1;
if (mode)
begin
H0_new = SHA256_H0_0;
@@ -356,7 +364,7 @@ module sha256_core(
H5_new = H5_reg + f_reg;
H6_new = H6_reg + g_reg;
H7_new = H7_reg + h_reg;
- H_we = 1;
+ H_we = 1'h1;
end
end // digest_logic
@@ -409,19 +417,19 @@ module sha256_core(
//----------------------------------------------------------------
always @*
begin : state_logic
- a_new = 32'h00000000;
- b_new = 32'h00000000;
- c_new = 32'h00000000;
- d_new = 32'h00000000;
- e_new = 32'h00000000;
- f_new = 32'h00000000;
- g_new = 32'h00000000;
- h_new = 32'h00000000;
- a_h_we = 0;
+ a_new = 32'h0;
+ b_new = 32'h0;
+ c_new = 32'h0;
+ d_new = 32'h0;
+ e_new = 32'h0;
+ f_new = 32'h0;
+ g_new = 32'h0;
+ h_new = 32'h0;
+ a_h_we = 1'h0;
if (state_init)
begin
- a_h_we = 1;
+ a_h_we = 1'h1;
if (first_block)
begin
if (mode)
@@ -470,7 +478,7 @@ module sha256_core(
f_new = e_reg;
g_new = f_reg;
h_new = g_reg;
- a_h_we = 1;
+ a_h_we = 1'h1;
end
end // state_logic
@@ -483,19 +491,19 @@ module sha256_core(
//----------------------------------------------------------------
always @*
begin : t_ctr
- t_ctr_new = 0;
- t_ctr_we = 0;
+ t_ctr_new = 6'h0;
+ t_ctr_we = 1'h0;
if (t_ctr_rst)
begin
- t_ctr_new = 0;
- t_ctr_we = 1;
+ t_ctr_new = 6'h0;
+ t_ctr_we = 1'h1;
end
if (t_ctr_inc)
begin
t_ctr_new = t_ctr_reg + 1'b1;
- t_ctr_we = 1;
+ t_ctr_we = 1'h1;
end
end // t_ctr
@@ -507,81 +515,86 @@ module sha256_core(
//----------------------------------------------------------------
always @*
begin : sha256_ctrl_fsm
- digest_init = 0;
- digest_update = 0;
-
- state_init = 0;
- state_update = 0;
-
- first_block = 0;
- ready_flag = 0;
-
- w_init = 0;
- w_next = 0;
-
- t_ctr_inc = 0;
- t_ctr_rst = 0;
-
- digest_valid_new = 0;
- digest_valid_we = 0;
-
+ digest_init = 1'h0;
+ digest_update = 1'h0;
+ state_init = 1'h0;
+ state_update = 1'h0;
+ first_block = 1'h0;
+ ready_flag = 1'h0;
+ w_init = 1'h0;
+ w_next = 1'h0;
+ t_ctr_inc = 1'h0;
+ t_ctr_rst = 1'h0;
+ digest_valid_new = 1'h0;
+ digest_valid_we = 1'h0;
sha256_ctrl_new = CTRL_IDLE;
- sha256_ctrl_we = 0;
+ sha256_ctrl_we = 1'h0;
case (sha256_ctrl_reg)
CTRL_IDLE:
begin
- ready_flag = 1;
+ ready_flag = 1'h1;
if (init)
begin
- digest_init = 1;
- w_init = 1;
- state_init = 1;
- first_block = 1;
- t_ctr_rst = 1;
- digest_valid_new = 0;
- digest_valid_we = 1;
- sha256_ctrl_new = CTRL_ROUNDS;
- sha256_ctrl_we = 1;
+ digest_init = 1'h1;
+ w_init = 1'h1;
+ state_init = 1'h1;
+ first_block = 1'h1;
+ t_ctr_rst = 1'h1;
+ digest_valid_new = 1'h0;
+ digest_valid_we = 1'h1;
+ sha256_ctrl_new = CTRL_ROUNDS0;
+ sha256_ctrl_we = 1'h1;
end
if (next)
begin
- w_init = 1;
- state_init = 1;
- t_ctr_rst = 1;
- digest_valid_new = 0;
- digest_valid_we = 1;
- sha256_ctrl_new = CTRL_ROUNDS;
- sha256_ctrl_we = 1;
+ w_init = 1'h1;
+ state_init = 1'h1;
+ t_ctr_rst = 1'h1;
+ digest_valid_new = 1'h0;
+ digest_valid_we = 1'h1;
+ sha256_ctrl_new = CTRL_ROUNDS0;
+ sha256_ctrl_we = 1'h1;
end
end
+ CTRL_ROUNDS0:
+ begin
+ sha256_ctrl_new = CTRL_ROUNDS1;
+ sha256_ctrl_we = 1'h1;
+ end
+
- CTRL_ROUNDS:
+ CTRL_ROUNDS1:
begin
- w_next = 1;
- state_update = 1;
- t_ctr_inc = 1;
+ w_next = 1'h1;
+ state_update = 1'h1;
+ t_ctr_inc = 1'h1;
if (t_ctr_reg == SHA256_ROUNDS)
begin
sha256_ctrl_new = CTRL_DONE;
- sha256_ctrl_we = 1;
+ sha256_ctrl_we = 1'h1;
+ end
+ else
+ begin
+ sha256_ctrl_new = CTRL_ROUNDS0;
+ sha256_ctrl_we = 1'h1;
end
end
CTRL_DONE:
begin
- digest_update = 1;
- digest_valid_new = 1;
- digest_valid_we = 1;
+ digest_update = 1'h1;
+ digest_valid_new = 1'h1;
+ digest_valid_we = 1'h1;
sha256_ctrl_new = CTRL_IDLE;
- sha256_ctrl_we = 1;
+ sha256_ctrl_we = 1'h1;
end
endcase // case (sha256_ctrl_reg)
end // sha256_ctrl_fsm
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