diff options
| -rw-r--r-- | src/rtl/sha256_core.v | 199 |
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 |