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This commit is contained in:
Byron Lathi
2025-07-14 11:10:43 -07:00
parent 2b57079205
commit 80e3faeae6
6 changed files with 131 additions and 21 deletions
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37
ChaCha20_Poly1305_64/src/poly1305_core.sv
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@@ -23,13 +23,15 @@ logic [127:0] poly1305_r, poly1305_s;
logic [129:0] accumulator, accumulator_next;
logic [129:0] data_one_extended;
logic [130:0] data_post_add;
logic [130:0] data_post_add, data_post_add_reg;
logic [257:0] data_post_mul, data_post_mul_reg;
logic phase;
logic [257:0] modulo_stage, modulo_stage_next;
logic [1:0] valid_sr;
logic [2:0] phase;
logic [3:0] valid_sr;
function logic [129:0] tkeep_expand (input [15:0] tkeep);
tkeep_expand = '0;
@@ -40,7 +42,7 @@ endfunction
// only ready in phase 0
assign s_data_axis.tready = phase == 0;
assign o_tag_valid = valid_sr[1];
assign o_tag_valid = valid_sr[3];
always_ff @(posedge i_clk) begin
if (i_rst) begin
@@ -48,7 +50,10 @@ always_ff @(posedge i_clk) begin
valid_sr <= '0;
end
valid_sr <= {valid_sr[0], s_data_axis.tlast & s_data_axis.tvalid & s_data_axis.tready & ~phase};
valid_sr <= {valid_sr[2:0], s_data_axis.tlast & s_data_axis.tvalid & s_data_axis.tready & (phase == 0)};
data_post_add_reg <= data_post_add;
data_post_mul_reg <= data_post_mul;
modulo_stage <= modulo_stage_next;
if (i_otk_valid) begin
poly1305_r <= i_otk[255:128] & R_MASK;
@@ -56,11 +61,18 @@ always_ff @(posedge i_clk) begin
end
if (s_data_axis.tvalid && phase == 0) begin
data_post_mul_reg <= data_post_mul;
phase <= '1;
phase <= 1;
end
if (phase == '1) begin
if (phase == 1) begin
phase <= 2;
end
if (phase == 2) begin
phase <= 3;
end
if (phase == 3) begin
accumulator <= accumulator_next;
phase <= '0;
end
@@ -73,10 +85,15 @@ always_comb begin
// phase == 0
data_one_extended = (tkeep_expand(s_data_axis.tkeep) + 1) | {2'b0, s_data_axis.tdata};
data_post_add = data_one_extended + accumulator;
data_post_mul = data_post_add * poly1305_r;
// phase == 1
accumulator_next = 130'(data_post_mul_reg % P130M5);
data_post_mul = data_post_add_reg * poly1305_r;
// phase == 2
modulo_stage_next = (data_post_mul_reg[257:130] * 5) + 258'(data_post_mul_reg[129:0]);
// phase == 3
accumulator_next = 130'((modulo_stage[257:130] * 5) + 258'(modulo_stage[129:0]));
end
assign o_tag = accumulator[127:0] + poly1305_s;