diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/modexp.v | 31 |
1 files changed, 7 insertions, 24 deletions
diff --git a/src/rtl/modexp.v b/src/rtl/modexp.v index 30b703e..58924c5 100644 --- a/src/rtl/modexp.v +++ b/src/rtl/modexp.v @@ -143,11 +143,8 @@ module modexp( reg [07 : 0] modulus_length_new; reg modulus_length_we; - reg [07 : 0] length_reg; - reg [07 : 0] length_new; reg [07 : 0] length_m1_reg; reg [07 : 0] length_m1_new; - reg length_we; reg start_reg; reg start_new; @@ -421,7 +418,6 @@ module modexp( modexp_ctrl_reg <= CTRL_IDLE; one_reg <= 32'h0; b_one_reg <= 32'h0; - length_reg <= DEFAULT_MODLENGTH; length_m1_reg <= 8'h0; loop_counter_reg <= 13'b0; ei_reg <= 1'b0; @@ -438,7 +434,10 @@ module modexp( exponent_length_reg <= exponent_length_new; if (modulus_length_we) - modulus_length_reg <= modulus_length_new; + begin + modulus_length_reg <= modulus_length_new; + length_m1_reg <= length_m1_new; + end if (start_we) start_reg <= start_new; @@ -455,12 +454,6 @@ module modexp( if (modexp_ctrl_we) modexp_ctrl_reg <= modexp_ctrl_new; - if (length_we) - begin - length_reg <= length_new; - length_m1_reg <= length_m1_new; - end - if (loop_counter_we) loop_counter_reg <= loop_counter_new; @@ -484,7 +477,6 @@ module modexp( exponent_length_we = 1'b0; start_new = 1'b0; start_we = 1'b0; - length_we = 1'b0; invalidate_residue = 1'b0; modulus_mem_api_rst = 1'b0; @@ -509,7 +501,6 @@ module modexp( exponation_mode_new = EXPONATION_MODE_SECRET_SECURE; modulus_length_new = write_data[7 : 0]; exponent_length_new = write_data[7 : 0]; - length_new = write_data[7 : 0]; length_m1_new = write_data[7 : 0] - 8'h1; tmp_read_data = 32'h00000000; @@ -546,11 +537,6 @@ module modexp( exponent_length_we = 1'b1; end - ADDR_LENGTH: - begin - length_we = 1'b1; - end - ADDR_MODULUS_PTR_RST: begin modulus_mem_api_rst = 1'b1; @@ -619,9 +605,6 @@ module modexp( ADDR_EXPONENT_LENGTH: tmp_read_data = {24'h000000, exponent_length_reg}; - ADDR_LENGTH: - tmp_read_data = {24'h000000, length_reg}; - ADDR_MODULUS_DATA: begin modulus_mem_api_cs = 1'b1; @@ -697,8 +680,8 @@ module modexp( always @* begin : residue_process //N*2, N=length*32, *32 = shl5, *64 = shl6 - residue_nn = { 1'b0, length_reg, 6'h0 }; - residue_length = length_reg; + residue_nn = { 1'b0, modulus_length_reg, 6'h0 }; + residue_length = modulus_length_reg; residue_opm_data = modulus_mem_int_rd_data; end @@ -726,7 +709,7 @@ module modexp( always @* begin : montprod_op_select - montprod_length = length_reg; + montprod_length = modulus_length_reg; result_mem_int_rd_addr = montprod_opa_addr; message_mem_int_rd_addr = montprod_opa_addr; |