diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/keywrap_core.v | 147 |
1 files changed, 122 insertions, 25 deletions
diff --git a/src/rtl/keywrap_core.v b/src/rtl/keywrap_core.v index e3e0723..14768d8 100644 --- a/src/rtl/keywrap_core.v +++ b/src/rtl/keywrap_core.v @@ -71,10 +71,18 @@ module keywrap_core ( //---------------------------------------------------------------- localparam OUTER_LOOP_MAX = 6; - localparam CTRL_IDLE = 3'h0; - localparam CTRL_INIT = 3'h1; - localparam CTRL_NEXT = 3'h2; - localparam CTRL_STEP1 = 3'h3; + + localparam CTRL_IDLE = 4'h0; + + localparam CTRL_INIT_START = 4'h1; + localparam CTRL_INIT_WAIT = 4'h2; + + localparam CTRL_NEXT_START = 4'h4; + localparam CTRL_NEXT_LOOP = 4'h5; + localparam CTRL_NEXT_WAIT = 4'h6; + localparam CTRL_NEXT_UPDATE = 4'h7; + localparam CTRL_NEXT_CHECK = 4'h8; + localparam CTRL_NEXT_FINALIZE = 4'h9; //---------------------------------------------------------------- @@ -89,6 +97,10 @@ module keywrap_core ( reg ready_new; reg ready_we; + reg valid_reg; + reg valid_new; + reg valid_we; + reg [13 : 0] api_addr_ctr_reg; reg [13 : 0] api_addr_ctr_new; reg api_addr_ctr_we; @@ -109,15 +121,14 @@ module keywrap_core ( reg iteration_ctr_set; reg iteration_ctr_rst; - reg [2 : 0] keywrap_core_ctrl_reg; - reg [2 : 0] keywrap_core_ctrl_new; + reg [3 : 0] keywrap_core_ctrl_reg; + reg [3 : 0] keywrap_core_ctrl_new; reg keywrap_core_ctrl_we; //---------------------------------------------------------------- // Wires. //---------------------------------------------------------------- - reg aes_encdec; reg aes_init; reg aes_next; wire aes_ready; @@ -128,7 +139,6 @@ module keywrap_core ( reg update_state; reg core_we; - reg [12 : 0] core_addr; reg [63 : 0] core_wr_data; wire [63 : 0] core_rd_data; @@ -145,7 +155,7 @@ module keywrap_core ( .api_rd_data(api_rd_data), .core_we(core_we), - .core_addr(core_addr), + .core_addr(block_ctr_reg), .core_wr_data(core_wr_data), .core_rd_data(core_rd_data) ); @@ -155,7 +165,7 @@ module keywrap_core ( .clk(clk), .reset_n(reset_n), - .encdec(aes_encdec), + .encdec(encdec), .init(aes_init), .next(aes_next), @@ -174,6 +184,8 @@ module keywrap_core ( // Assignments for ports. //---------------------------------------------------------------- assign a_result = a_reg; + assign ready = ready_reg; + assign valid = valid_reg; //---------------------------------------------------------------- @@ -185,6 +197,7 @@ module keywrap_core ( begin a_reg <= 64'h0; ready_reg <= 1'h0; + valid_reg <= 1'h0; api_addr_ctr_reg <= 14'h0; block_ctr_reg <= 13'h0; iteration_ctr_reg <= 3'h0; @@ -199,6 +212,9 @@ module keywrap_core ( if (ready_we) ready_reg <= ready_new; + if (valid_we) + valid_reg <= valid_new; + if (api_addr_ctr_we) api_addr_ctr_reg <= api_addr_ctr_new; @@ -221,10 +237,11 @@ module keywrap_core ( //---------------------------------------------------------------- always @* begin : keywrap_dp - reg xor_val; + reg [63 : 0] xor_val; - a_we = 1'h0; - a_new = 32'h0; + a_new = 64'h0; + a_we = 1'h0; + core_we = 1'h0; aes_block = {a_reg, core_rd_data}; core_wr_data = aes_result[63 : 0]; @@ -232,14 +249,15 @@ module keywrap_core ( if (init_a) begin - a_we = 1'h1; a_new = a_init; + a_we = 1'h1; end if (update_state) begin - a_we = 1'h1; - a_new = aes_result[127 : 64] ^ xor_val; + a_new = aes_result[127 : 64] ^ xor_val; + a_we = 1'h1; + core_we = 1'h1; end end @@ -328,9 +346,12 @@ module keywrap_core ( //---------------------------------------------------------------- always @* begin : keywrap_core_ctrl + ready_new = 1'h0; + ready_we = 1'h0; + valid_new = 1'h0; + valid_we = 1'h0; init_a = 1'h0; update_state = 1'h0; - aes_encdec = 1'h0; aes_init = 1'h0; aes_next = 1'h0; api_addr_ctr_rst = 1'h0; @@ -344,49 +365,125 @@ module keywrap_core ( keywrap_core_ctrl_new = CTRL_IDLE; keywrap_core_ctrl_we = 1'h0; + + if (api_cs && api_we) + api_addr_ctr_inc = 1'h1; + + case (keywrap_core_ctrl_reg) CTRL_IDLE: begin if (init) begin - keywrap_core_ctrl_new = CTRL_INIT; + ready_new = 1'h0; + ready_we = 1'h1; + valid_new = 1'h0; + valid_we = 1'h1; + keywrap_core_ctrl_new = CTRL_INIT_START; keywrap_core_ctrl_we = 1'h1; end if (next) begin - keywrap_core_ctrl_new = CTRL_NEXT; + ready_new = 1'h0; + ready_we = 1'h1; + keywrap_core_ctrl_new = CTRL_NEXT_START; keywrap_core_ctrl_we = 1'h1; end end - CTRL_INIT: + CTRL_INIT_START: begin api_addr_ctr_rst = 1'h1; - keywrap_core_ctrl_new = CTRL_IDLE; + aes_init = 1'h1; + keywrap_core_ctrl_new = CTRL_INIT_WAIT; keywrap_core_ctrl_we = 1'h1; end + CTRL_INIT_WAIT: + begin + if (aes_ready) + begin + ready_new = 1'h1; + ready_we = 1'h1; + keywrap_core_ctrl_new = CTRL_IDLE; + keywrap_core_ctrl_we = 1'h1; + end + end + - CTRL_NEXT: + CTRL_NEXT_START: begin init_a = 1'h1; block_ctr_rst = 1'h1; iteration_ctr_rst = 1'h1; - keywrap_core_ctrl_new = CTRL_STEP1; + keywrap_core_ctrl_new = CTRL_NEXT_LOOP; keywrap_core_ctrl_we = 1'h1; end - CTRL_STEP1: + CTRL_NEXT_LOOP: + begin + aes_next = 1'h1; + keywrap_core_ctrl_new = CTRL_NEXT_WAIT; + keywrap_core_ctrl_we = 1'h1; + end + + + CTRL_NEXT_WAIT: + begin + if (aes_ready) + begin + keywrap_core_ctrl_new = CTRL_NEXT_UPDATE; + keywrap_core_ctrl_we = 1'h1; + end + end + + + CTRL_NEXT_UPDATE: begin update_state = 1'h1; - keywrap_core_ctrl_new = CTRL_IDLE; + keywrap_core_ctrl_new = CTRL_NEXT_CHECK; keywrap_core_ctrl_we = 1'h1; end + CTRL_NEXT_CHECK: + begin + if (block_ctr_reg < rlen) + begin + block_ctr_inc = 1'h1; + keywrap_core_ctrl_new = CTRL_NEXT_LOOP; + keywrap_core_ctrl_we = 1'h1; + end + + else if (iteration_ctr_reg < OUTER_LOOP_MAX) + begin + block_ctr_rst = 1'h1; + iteration_ctr_inc = 1'h1; + keywrap_core_ctrl_new = CTRL_NEXT_LOOP; + keywrap_core_ctrl_we = 1'h1; + end + + else + begin + keywrap_core_ctrl_new = CTRL_NEXT_FINALIZE; + keywrap_core_ctrl_we = 1'h1; + end + end + + + CTRL_NEXT_FINALIZE: + begin + ready_new = 1'h1; + ready_we = 1'h1; + valid_new = 1'h1; + valid_we = 1'h1; + keywrap_core_ctrl_new = CTRL_IDLE; + keywrap_core_ctrl_we = 1'h1; + end + default: begin |