【GoKit试用体验】GoKit无线数据传输加密系统

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2015.6.22
二元扩域下椭圆曲线加密算法域元素基本运算
1. 元元素加法

1. // f2m_add.v
   
2. // f2m_add: c = a + b, in field F_{2^M}
   
3. //`include "inc.v"
   
4. 
   
5. `include "../rtl/inc.v"
   
6. 
   
7. module f2m_add(
   
8. input wire [`WIDTH:0] pi_a,
   
9. input wire [`WIDTH:0] pi_b,
   
10. output wire [`WIDTH:0] po_c
    
11. );
    
12. 
    
13. assign po_c = pi_a ^ pi_b;
    
14. endmodule

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2. 域元素乘法

1. // f2m_mult.v
   
2. 
   
3. `include "../rtl/inc.v"
   
4. 
   
5. module f2m_mult(
   
6. input wire [0:0] clk,
   
7. input wire [0:0] rst,
   
8. input wire [`WIDTH:0] pi_a,
   
9. input wire [`WIDTH:0] pi_b,
   
10. input wire [`M:0] pi_fx,
    
11. output reg done,
    
12. output reg [`WIDTH:0] po_c
    
13. );
    
14. 
    
15. parameter [1:0] IDLE = 2'b00;
    
16. parameter [1:0] BUSY = 2'b01;
    
17. //parameter [1:0] WAIT = 2'b10;
    
18. //parameter [1:0] FREE = 2'b11;
    
19. 
    
20. reg [0:0] state = IDLE;
    
21. //reg [0:0] next = IDLE;
    
22. reg [`WIDTH:0] a = 0;
    
23. reg [`WIDTH:0] b = 0;
    
24. reg [`M:0] fx = 0;
    
25. reg [`WIDTH:0] i = 0;
    
26. reg [`WIDTH:0] cnt = 0;
    
27. 
    
28. always @(posedge clk)// or negedge rst
    
29. if(rst == 1'b1) begin
    
30. state <= IDLE;
    
31. done <= 1'b0;
    
32. po_c <= 0;//5'b10101;
    
33. cnt <= 0;
    
34. end
    
35. 
    
36. else if(state == IDLE && done == 1'b0) begin
    
37. a <= pi_a;
    
38. b <= pi_b;
    
39. fx <= pi_fx;
    
40. //done <= 1'b0;
    
41. if(a[0] == 1'b1)
    
42. po_c <= pi_b;
    
43. else
    
44. po_c <= 0;
    
45. state <= BUSY;
    
46. end
    
47. else if(state == BUSY && done == 1'b0) begin
    
48. if(b[`WIDTH] == 1'b0) begin
    
49. for(i = `WIDTH; i > 0; i = i - 1)
    
50. b[i] <= b[i-1];
    
51. b[0] <= 1'b0;//b <= (b << 1);
    
52. end
    
53. 
    
54. else if(b[`WIDTH] == 1'b1) begin
    
55. for(i = `WIDTH; i > 0; i = i - 1)
    
56. b[i] <= b[i-1] ^ fx[i];
    
57. b[0] <= fx[0];
    
58. end
    
59. 
    
60. for(i = 0; i < `WIDTH-1; i = i + 1)
    
61. a[i] <= a[i+1];//a <= (a >> 1);
    
62. a[`WIDTH] = 1'b0;
    
63. if(a[0] == 1'b1)
    
64. po_c <= po_c ^ b;
    
65. cnt <= cnt + 1;
    
66. if(cnt == `WIDTH) begin
    
67. done <= 1'b1;
    
68. state <= IDLE;
    
69. end
    
70. end
    
71. endmodule
    

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