diff options
Diffstat (limited to 'src/rtl/keywrap_core.v')
| -rw-r--r-- | src/rtl/keywrap_core.v | 127 |
1 files changed, 112 insertions, 15 deletions
diff --git a/src/rtl/keywrap_core.v b/src/rtl/keywrap_core.v index 6e29d45..e3e0723 100644 --- a/src/rtl/keywrap_core.v +++ b/src/rtl/keywrap_core.v @@ -56,6 +56,9 @@ module keywrap_core ( input wire [255 : 0] key, input wire keylen, + input wire [63 : 0] a_init, + output wire [63 : 0] a_result, + input wire api_cs, input wire api_we, input wire [31 : 0] api_wr_data, @@ -68,12 +71,10 @@ module keywrap_core ( //---------------------------------------------------------------- localparam OUTER_LOOP_MAX = 6; - localparam CTRL_IDLE = 3'h0; localparam CTRL_INIT = 3'h1; localparam CTRL_NEXT = 3'h2; - - localparam RFC5649_A_IV = 32'ha65959a6; + localparam CTRL_STEP1 = 3'h3; //---------------------------------------------------------------- @@ -82,7 +83,7 @@ module keywrap_core ( reg [63 : 0] a_reg; reg [63 : 0] a_new; reg a_we; - reg a_init; + reg init_a; reg ready_reg; reg ready_new; @@ -124,6 +125,8 @@ module keywrap_core ( wire [127 : 0] aes_result; wire aes_valid; + reg update_state; + reg core_we; reg [12 : 0] core_addr; reg [63 : 0] core_wr_data; @@ -166,9 +169,11 @@ module keywrap_core ( .result_valid(aes_valid) ); + //---------------------------------------------------------------- // Assignments for ports. //---------------------------------------------------------------- + assign a_result = a_reg; //---------------------------------------------------------------- @@ -178,12 +183,30 @@ module keywrap_core ( begin: reg_update if (!reset_n) begin + a_reg <= 64'h0; + ready_reg <= 1'h0; + api_addr_ctr_reg <= 14'h0; + block_ctr_reg <= 13'h0; + iteration_ctr_reg <= 3'h0; keywrap_core_ctrl_reg <= CTRL_IDLE; - - end + end else begin + if (a_we) + a_reg <= a_new; + + if (ready_we) + ready_reg <= ready_new; + + if (api_addr_ctr_we) + api_addr_ctr_reg <= api_addr_ctr_new; + + if (block_ctr_we) + block_ctr_reg <= block_ctr_new; + + if (iteration_ctr_we) + iteration_ctr_reg <= iteration_ctr_new; if (keywrap_core_ctrl_we) keywrap_core_ctrl_reg <= keywrap_core_ctrl_new; @@ -192,6 +215,36 @@ module keywrap_core ( //---------------------------------------------------------------- + // keywrap_dp + // + // Main logic for the key wrap functionality. + //---------------------------------------------------------------- + always @* + begin : keywrap_dp + reg xor_val; + + a_we = 1'h0; + a_new = 32'h0; + + aes_block = {a_reg, core_rd_data}; + core_wr_data = aes_result[63 : 0]; + xor_val = (rlen * iteration_ctr_reg) + block_ctr_reg; + + if (init_a) + begin + a_we = 1'h1; + a_new = a_init; + end + + if (update_state) + begin + a_we = 1'h1; + a_new = aes_result[127 : 64] ^ xor_val; + end + end + + + //---------------------------------------------------------------- // api_addr_ctr //---------------------------------------------------------------- always @* @@ -275,21 +328,65 @@ module keywrap_core ( //---------------------------------------------------------------- always @* begin : keywrap_core_ctrl - aes_encdec = 0; - aes_init = 0; - aes_next = 0; - block_ctr_inc = 0; - block_ctr_rst = 0; - iteration_ctr_inc = 0; - iteration_ctr_dec = 0; - iteration_ctr_set = 0; - iteration_ctr_rst = 0; + 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; + api_addr_ctr_inc = 1'h0; + block_ctr_inc = 1'h0; + block_ctr_rst = 1'h0; + iteration_ctr_inc = 1'h0; + iteration_ctr_dec = 1'h0; + iteration_ctr_set = 1'h0; + iteration_ctr_rst = 1'h0; + keywrap_core_ctrl_new = CTRL_IDLE; + keywrap_core_ctrl_we = 1'h0; case (keywrap_core_ctrl_reg) CTRL_IDLE: begin + if (init) + begin + keywrap_core_ctrl_new = CTRL_INIT; + keywrap_core_ctrl_we = 1'h1; + end + + if (next) + begin + keywrap_core_ctrl_new = CTRL_NEXT; + keywrap_core_ctrl_we = 1'h1; + end + end + + + CTRL_INIT: + begin + api_addr_ctr_rst = 1'h1; + keywrap_core_ctrl_new = CTRL_IDLE; + keywrap_core_ctrl_we = 1'h1; end + + CTRL_NEXT: + begin + init_a = 1'h1; + block_ctr_rst = 1'h1; + iteration_ctr_rst = 1'h1; + keywrap_core_ctrl_new = CTRL_STEP1; + keywrap_core_ctrl_we = 1'h1; + end + + + CTRL_STEP1: + begin + update_state = 1'h1; + keywrap_core_ctrl_new = CTRL_IDLE; + keywrap_core_ctrl_we = 1'h1; + end + + default: begin |