Updating modexp core to v 0.50. This version contains a working core that can perform sign and verify with big keys/values. The core builds ok in Altera and Xilinx FPGA tools. This commit also includes a new testgenerator capable of generating testbench for modexp with autgenerated test data of different lengths. The README has been updated with status and implementation results in for different FPGA devices.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/rtl/montprod.v b/src/rtl/montprod.v
index 32bbdec..2ed1f5d 100644
--- a/src/rtl/montprod.v
+++ b/src/rtl/montprod.v
@@ -63,6 +63,7 @@ module montprod(
   //----------------------------------------------------------------
   // Internal constant and parameter definitions.
   //----------------------------------------------------------------
+
   localparam CTRL_IDLE           = 4'h0;
   localparam CTRL_INIT_S         = 4'h1;
   localparam CTRL_LOOP_INIT      = 4'h2;
@@ -217,9 +218,11 @@ module montprod(
         SMUX_SHR:
           s_mem_new = shr_adiv2;
       endcase
-      $display("SMUX%x: %x", s_mux_reg, s_mem_new);
+      if (DEBUG)
+        $display("SMUX%x: %x", s_mux_reg, s_mem_new);
     end
 
+
   //----------------------------------------------------------------
   // reg_update
   //
@@ -286,7 +289,8 @@ module montprod(
            //opa_addr will point to length-1 to get A LSB.
            //s_read_addr will point to length-1
            q = s_mem_read_data[0] ^ (opa_data[0] & b);
-           $display("s_mem_read_data: %x opa_data %x b %x q %x B_bit_index_reg %x", s_mem_read_data, opa_data, b, q, B_bit_index_reg);
+           if (DEBUG)
+             $display("s_mem_read_data: %x opa_data %x b %x q %x B_bit_index_reg %x", s_mem_read_data, opa_data, b, q, B_bit_index_reg);
         end
    end
 
@@ -296,6 +300,7 @@ module montprod(
   //----------------------------------------------------------------
   always @*
    begin : loop_counter_process
+     loop_counter_new  = loop_counter;
       length_m1        = length - 1'b1;
       loop_counter_dec = loop_counter - 1'b1;
       B_word_index     = loop_counter[12:5];
@@ -560,7 +565,8 @@ module montprod(
 
         CTRL_EMIT_S:
            begin
-             $display("EMIT_S word_index: %d", word_index);
+             if (DEBUG)
+               $display("EMIT_S word_index: %d", word_index);
              if (word_index_prev == 8'h0)
                begin
                  montprod_ctrl_new = CTRL_DONE;