diff options
Diffstat (limited to 'src/rtl/chacha_core.v')
| -rw-r--r-- | src/rtl/chacha_core.v | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/src/rtl/chacha_core.v b/src/rtl/chacha_core.v index d68f783..32f37f5 100644 --- a/src/rtl/chacha_core.v +++ b/src/rtl/chacha_core.v @@ -80,9 +80,10 @@ module chacha_core( localparam CTRL_IDLE = 3'h0; localparam CTRL_INIT = 3'h1; - localparam CTRL_ROUNDS = 3'h2; - localparam CTRL_FINALIZE = 3'h3; - localparam CTRL_DONE = 3'h4; + localparam CTRL_ROUNDS0 = 3'h2; + localparam CTRL_ROUNDS1 = 3'h3; + localparam CTRL_FINALIZE = 3'h4; + localparam CTRL_DONE = 3'h5; //---------------------------------------------------------------- @@ -390,7 +391,6 @@ module chacha_core( for (i = 0 ; i < 16 ; i = i + 1) state_new[i] = 32'h0; - state_we = 0; qr0_a = 32'h0; qr0_b = 32'h0; @@ -413,12 +413,10 @@ module chacha_core( begin for (i = 0 ; i < 16 ; i = i + 1) state_new[i] = init_state_word[i]; - state_we = 1; end // if (init_state) if (update_state) begin - state_we = 1; case (qr_ctr_reg) QR0: begin @@ -621,6 +619,7 @@ module chacha_core( begin : chacha_ctrl_fsm init_state = 0; update_state = 0; + state_we = 0; update_output = 0; qr_ctr_inc = 0; qr_ctr_rst = 0; @@ -651,16 +650,26 @@ module chacha_core( CTRL_INIT: begin init_state = 1; + state_we = 1; qr_ctr_rst = 1; dr_ctr_rst = 1; - chacha_ctrl_new = CTRL_ROUNDS; + chacha_ctrl_new = CTRL_ROUNDS0; chacha_ctrl_we = 1; end - CTRL_ROUNDS: + CTRL_ROUNDS0: begin + update_state = 1; + chacha_ctrl_new = CTRL_ROUNDS1; + chacha_ctrl_we = 1; + end + + CTRL_ROUNDS1: + begin + state_we = 1; update_state = 1; qr_ctr_inc = 1; + if (qr_ctr_reg == QR1) begin dr_ctr_inc = 1; @@ -669,6 +678,16 @@ module chacha_core( chacha_ctrl_new = CTRL_FINALIZE; chacha_ctrl_we = 1; end + else + begin + chacha_ctrl_new = CTRL_ROUNDS0; + chacha_ctrl_we = 1; + end + end + else + begin + chacha_ctrl_new = CTRL_ROUNDS0; + chacha_ctrl_we = 1; end end |