diff options
Diffstat (limited to 'src/rtl')
| -rw-r--r-- | src/rtl/keywrap_core.v | 113 |
1 files changed, 84 insertions, 29 deletions
diff --git a/src/rtl/keywrap_core.v b/src/rtl/keywrap_core.v index eda8459..61f7859 100644 --- a/src/rtl/keywrap_core.v +++ b/src/rtl/keywrap_core.v @@ -3,7 +3,8 @@ // keywrap_core.v // -------------- // Core that tries to implement AES KEY WRAP as specified in -// RFC 3394. Experimental core at the moment. +// RFC 3394 and extended with padding in RFC 5649. +// Experimental core at the moment. Does Not Work. // The maximum wrap object size is 64 kByte. // // @@ -67,6 +68,8 @@ module keywrap_core ( localparam CTRL_INIT = 3'h1; localparam CTRL_NEXT = 3'h2; + localparam RFC5649_A_IV = 32'ha65959a6; + //---------------------------------------------------------------- // Registers and memories including control signals. @@ -80,23 +83,19 @@ module keywrap_core ( reg ready_new; reg ready_we; - reg [12 : 0] block_loop_ctr_reg; - reg [12 : 0] block_loop_ctr_new; - reg block_loop_ctr_we; - reg block_loop_ctr_inc; - reg block_loop_ctr_rst; - - reg [2 : 0] outer_loop_ctr_reg; - reg [2 : 0] outer_loop_ctr_new; - reg outer_loop_ctr_we; - reg outer_loop_ctr_inc; - reg outer_loop_ctr_dec; - reg outer_loop_ctr_set; - reg outer_loop_ctr_rst; + reg [12 : 0] block_ctr_reg; + reg [12 : 0] block_ctr_new; + reg block_ctr_we; + reg block_ctr_inc; + reg block_ctr_rst; - reg [12 : 0] core_addr_ctr_reg; - reg [12 : 0] core_addr_ctr_new; - reg core_addr_ctr_we; + reg [2 : 0] iteration_ctr_reg; + reg [2 : 0] iteration_ctr_new; + reg iteration_ctr_we; + reg iteration_ctr_inc; + reg iteration_ctr_dec; + reg iteration_ctr_set; + reg iteration_ctr_rst; reg [2 : 0] keywrap_core_ctrl_reg; reg [2 : 0] keywrap_core_ctrl_new; @@ -126,8 +125,8 @@ module keywrap_core ( // Instantiations. //---------------------------------------------------------------- keywrap_mem mem( - .clk(), - .reset_n(), + .clk(clk), + .reset_n(reset_n), .api_we(api_we), .api_addr(api_addr), .api_wr_data(api_wr_data), @@ -179,20 +178,76 @@ module keywrap_core ( //---------------------------------------------------------------- + // block_ctr + //---------------------------------------------------------------- + always @* + begin : block_ctr + block_ctr_new = 13'h0; + block_ctr_we = 1'h0; + + if (block_ctr_rst) + begin + block_ctr_new = 13'h0; + block_ctr_we = 1'h1; + end + + if (block_ctr_inc) + begin + block_ctr_new = block_ctr_reg + 1'h1; + block_ctr_we = 1'h1; + end + end + + + //---------------------------------------------------------------- + // iteration_ctr + //---------------------------------------------------------------- + always @* + begin : iteration_ctr + iteration_ctr_new = 3'h0; + iteration_ctr_we = 1'h0; + + if (iteration_ctr_rst) + begin + iteration_ctr_new = 3'h0; + iteration_ctr_we = 1'h1; + end + + if (iteration_ctr_set) + begin + iteration_ctr_new = 3'h5; + iteration_ctr_we = 1'h1; + end + + if (iteration_ctr_dec) + begin + iteration_ctr_new = iteration_ctr_reg + 1'h1; + iteration_ctr_we = 1'h1; + end + + if (iteration_ctr_inc) + begin + iteration_ctr_new = iteration_ctr_reg + 1'h1; + iteration_ctr_we = 1'h1; + end + + end + + + //---------------------------------------------------------------- // keywrap_core_ctrl //---------------------------------------------------------------- always @* begin : keywrap_core_ctrl - aes_encdec = 0; - aes_init = 0; - aes_next = 0; - block_loop_ctr_inc = 0; - block_loop_ctr_rst = 0; - outer_loop_ctr_inc = 0; - outer_loop_ctr_dec = 0; - outer_loop_ctr_set = 0; - outer_loop_ctr_rst = 0; - + 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; case (keywrap_core_ctrl_reg) CTRL_IDLE: |