Unified Coverage Report :: Module :: prim_subst_perm

Module : prim_subst_perm

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
100.00	100.00

Source File(s) :
/workspaces/repo/scratch/os_regression_2024_09_10/rom_ctrl_64kB-sim-vcs/default/sim-vcs/../src/lowrisc_prim_cipher_0/rtl/prim_subst_perm.sv

Module self-instances :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
tb.dut.gen_rom_scramble_enabled.u_rom.u_sp_addr	100.00	100.00

---

Module Instance : tb.dut.gen_rom_scramble_enabled.u_rom.u_sp_addr

Instance :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
100.00	100.00

Instance's subtree :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
100.00	100.00

Parent :

SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT	NAME
87.50	75.00					100.00	gen_rom_scramble_enabled.u_rom

Subtrees :

NAME	SCORE	LINE	COND	TOGGLE	FSM	BRANCH	ASSERT
no children

---

Since this is the module's only instance, the coverage report is the same as for the module.

Line Coverage for Module : prim_subst_perm

	Line No.	Total	Covered	Percent
TOTAL		22	22	100.00
CONT_ASSIGN	35	1	1	100.00
ALWAYS	64	10	10	100.00
ALWAYS	64	10	10	100.00
CONT_ASSIGN	90	1	1	100.00

34                        // initialize
35         1/1            assign data_state[0] = data_i;
           Tests:       T1 T2 T3 
36                      
37                        for (genvar r = 0; r < NumRounds; r++) begin : gen_round
38                          logic [DataWidth-1:0] data_state_sbox, data_state_flipped;
39                          ////////////////////////////////
40                          // decryption pass, performs inverse permutation and sbox
41                          if (Decrypt) begin : gen_dec
42                            always_comb begin : p_dec
43                              data_state_sbox = data_state[r] ^ key_i;
44                              // Reverse odd/even grouping
45                              data_state_flipped = data_state_sbox;
46                              for (int k = 0; k < DataWidth/2; k++) begin
47                                data_state_flipped[k * 2]     = data_state_sbox[k];
48                                data_state_flipped[k * 2 + 1] = data_state_sbox[k + DataWidth/2];
49                              end
50                              // Flip vector
51                              for (int k = 0; k < DataWidth; k++) begin
52                                data_state_sbox[DataWidth - 1 - k] = data_state_flipped[k];
53                              end
54                              // Inverse SBox layer
55                              for (int k = 0; k < DataWidth/4; k++) begin
56                                data_state_sbox[k*4 +: 4] = prim_cipher_pkg::PRESENT_SBOX4_INV[data_state_sbox[k*4 +: 4]];
57                              end
58                              data_state[r + 1] = data_state_sbox;
59                            end
60                          ////////////////////////////////
61                          // encryption pass
62                          end else begin : gen_enc
63                            always_comb begin : p_enc
64         1/1                  data_state_sbox = data_state[r] ^ key_i;
           Tests:       T1 T2 T3 
65                              // This SBox layer is aligned to nibbles, so the uppermost bits may not be affected by this.
66                              // However, the permutation below ensures that these bits get shuffled to a different
67                              // position when performing multiple rounds.
68         1/1                  for (int k = 0; k < DataWidth/4; k++) begin
           Tests:       T1 T2 T3 
69         1/1                    data_state_sbox[k*4 +: 4] = prim_cipher_pkg::PRESENT_SBOX4[data_state_sbox[k*4 +: 4]];
           Tests:       T1 T2 T3 
70                              end
71                              // Flip the vector to move the MSB positions into the LSB positions
72         1/1                  for (int k = 0; k < DataWidth; k++) begin
           Tests:       T1 T2 T3 
73         1/1                    data_state_flipped[DataWidth - 1 - k] = data_state_sbox[k];
           Tests:       T1 T2 T3 
74                              end
75                              // Regroup bits such that all even indices are stacked up first, followed by all odd
76                              // indices. Note that if the Width is odd, this is still ok, since
77                              // the uppermost bit just stays in place in that case.
78         1/1                  data_state_sbox = data_state_flipped;
           Tests:       T1 T2 T3 
79         1/1                  for (int k = 0; k < DataWidth/2; k++) begin
           Tests:       T1 T2 T3 
80         1/1                    data_state_sbox[k]               = data_state_flipped[k * 2];
           Tests:       T1 T2 T3 
81         1/1                    data_state_sbox[k + DataWidth/2] = data_state_flipped[k * 2 + 1];
           Tests:       T1 T2 T3 
82                              end
83         1/1                  data_state[r + 1] = data_state_sbox;
           Tests:       T1 T2 T3 
***repeat 1
64         1/1                  data_state_sbox = data_state[r] ^ key_i;
           Tests:       T1 T2 T3 
65                              // This SBox layer is aligned to nibbles, so the uppermost bits may not be affected by this.
66                              // However, the permutation below ensures that these bits get shuffled to a different
67                              // position when performing multiple rounds.
68         1/1                  for (int k = 0; k < DataWidth/4; k++) begin
           Tests:       T1 T2 T3 
69         1/1                    data_state_sbox[k*4 +: 4] = prim_cipher_pkg::PRESENT_SBOX4[data_state_sbox[k*4 +: 4]];
           Tests:       T1 T2 T3 
70                              end
71                              // Flip the vector to move the MSB positions into the LSB positions
72         1/1                  for (int k = 0; k < DataWidth; k++) begin
           Tests:       T1 T2 T3 
73         1/1                    data_state_flipped[DataWidth - 1 - k] = data_state_sbox[k];
           Tests:       T1 T2 T3 
74                              end
75                              // Regroup bits such that all even indices are stacked up first, followed by all odd
76                              // indices. Note that if the Width is odd, this is still ok, since
77                              // the uppermost bit just stays in place in that case.
78         1/1                  data_state_sbox = data_state_flipped;
           Tests:       T1 T2 T3 
79         1/1                  for (int k = 0; k < DataWidth/2; k++) begin
           Tests:       T1 T2 T3 
80         1/1                    data_state_sbox[k]               = data_state_flipped[k * 2];
           Tests:       T1 T2 T3 
81         1/1                    data_state_sbox[k + DataWidth/2] = data_state_flipped[k * 2 + 1];
           Tests:       T1 T2 T3 
82                              end
83         1/1                  data_state[r + 1] = data_state_sbox;
           Tests:       T1 T2 T3 
84                            end
85                          end // gen_enc
86                          ////////////////////////////////
87                        end // gen_round
88                      
89                        // finalize
90         1/1            assign data_o = data_state[NumRounds] ^ key_i;
           Tests:       T1 T2 T3