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-rw-r--r--src/rtl/trng.v80
-rw-r--r--src/rtl/trng_csprng.v36
-rw-r--r--src/rtl/trng_mixer.v157
3 files changed, 226 insertions, 47 deletions
diff --git a/src/rtl/trng.v b/src/rtl/trng.v
index 7d0e45d..e2b9212 100644
--- a/src/rtl/trng.v
+++ b/src/rtl/trng.v
@@ -82,11 +82,15 @@ module trng(
parameter ADDR_TRNG_STATUS = 8'h11;
parameter ADDR_DEBUG_CTRL = 8'h12;
+ parameter ADDR_DEBUG_DELAY = 8'h13;
parameter TRNG_NAME0 = 32'h74726e67; // "trng"
parameter TRNG_NAME1 = 32'h20202020; // " "
parameter TRNG_VERSION = 32'h302e3031; // "0.01"
+ // 20x/s @ 50 MHz.
+ parameter DEFAULT_DEBUG_DELAY = 32'h002625a0;
+
//----------------------------------------------------------------
// Registers including update variables and write enable.
@@ -98,10 +102,21 @@ module trng(
reg test_mode_new;
reg test_mode_we;
+ reg [7 : 0] debug_out_reg;
+ reg debug_out_we;
+
reg [2 : 0] debug_mux_reg;
reg [2 : 0] debug_mux_new;
reg [2 : 0] debug_mux_we;
+ reg [31 : 0] debug_delay_ctr_reg;
+ reg [31 : 0] debug_delay_ctr_new;
+ reg debug_delay_ctr_we;
+
+ reg [31 : 0] debug_delay_reg;
+ reg [31 : 0] debug_delay_new;
+ reg debug_delay_we;
+
//----------------------------------------------------------------
// Wires.
@@ -119,6 +134,7 @@ module trng(
reg mixer_api_we;
wire [31 : 0] mixer_api_read_data;
wire mixer_api_error;
+ wire mixer_security_error;
wire [7 : 0] mixer_debug;
reg mixer_debug_update;
@@ -130,6 +146,7 @@ module trng(
wire csprng_api_error;
wire [7 : 0] csprng_debug;
reg csprng_debug_update;
+ wire csprng_security_error;
wire entropy0_entropy_enabled;
wire [31 : 0] entropy0_entropy_data;
@@ -174,7 +191,7 @@ module trng(
assign read_data = tmp_read_data;
assign error = tmp_error;
assign security_error = entropy1_security_error | entropy2_security_error;
- assign debug = tmp_debug;
+ assign debug = debug_out_reg;
// Patches to get our first version to work.
assign entropy0_entropy_enabled = 0;
@@ -198,6 +215,7 @@ module trng(
.discard(discard_reg),
.test_mode(test_mode_reg),
+ .security_error(mixer_security_error),
.more_seed(csprng_more_seed),
@@ -237,6 +255,7 @@ module trng(
.discard(discard_reg),
.test_mode(test_mode_reg),
+ .security_error(csprng_security_error),
.more_seed(csprng_more_seed),
@@ -310,13 +329,22 @@ module trng(
begin
if (!reset_n)
begin
- discard_reg <= 0;
- test_mode_reg <= 0;
- debug_mux_reg <= DEBUG_ENTROPY1;
+ discard_reg <= 0;
+ test_mode_reg <= 0;
+ debug_mux_reg <= DEBUG_CSPRNG;
+ debug_delay_reg <= DEFAULT_DEBUG_DELAY;
+ debug_delay_ctr_reg <= 32'h00000000;
+ debug_out_reg <= 8'h00;
end
else
begin
- discard_reg <= discard_new;
+ discard_reg <= discard_new;
+ debug_delay_ctr_reg <= debug_delay_ctr_new;
+
+ if (debug_out_we)
+ begin
+ debug_out_reg <= tmp_debug;
+ end
if (test_mode_we)
begin
@@ -327,12 +355,40 @@ module trng(
begin
debug_mux_reg <= debug_mux_new;
end
+
+ if (debug_delay_we)
+ begin
+ debug_delay_reg <= debug_delay_new;
+ end
end
end // reg_update
//----------------------------------------------------------------
+ // debug_update_logic
+ //
+ // Debug update counter and update logic.
+ //----------------------------------------------------------------
+ always @*
+ begin : debug_update_logic
+ if (debug_delay_ctr_reg == debug_delay_reg)
+ begin
+ debug_out_we = 1;
+ debug_delay_ctr_new = 32'h00000000;
+ end
+ else
+ begin
+ debug_out_we = 0;
+ debug_delay_ctr_new = debug_delay_ctr_reg + 1'b1;
+ end
+ end // debug_update
+
+
+ //----------------------------------------------------------------
// debug_mux
+ //
+ // Select which of the sub modules that are connected to
+ // the debug port.
//----------------------------------------------------------------
always @*
begin : debug_mux
@@ -373,7 +429,6 @@ module trng(
end
endcase // case (debug_mux_reg)
-
end // debug_mux
@@ -467,6 +522,8 @@ module trng(
test_mode_we = 0;
debug_mux_new = 3'h0;
debug_mux_we = 0;
+ debug_delay_new = 32'h00000000;
+ debug_delay_we = 0;
trng_api_read_data = 32'h00000000;
trng_api_error = 0;
@@ -490,6 +547,12 @@ module trng(
debug_mux_we = 1;
end
+ ADDR_DEBUG_DELAY:
+ begin
+ debug_delay_new = write_data;
+ debug_delay_we = 1;
+ end
+
default:
begin
trng_api_error = 1;
@@ -531,6 +594,11 @@ module trng(
trng_api_read_data = debug_mux_new;
end
+ ADDR_DEBUG_DELAY:
+ begin
+ trng_api_read_data = debug_delay_reg;
+ end
+
default:
begin
trng_api_error = 1;
diff --git a/src/rtl/trng_csprng.v b/src/rtl/trng_csprng.v
index 83c383f..c4576e8 100644
--- a/src/rtl/trng_csprng.v
+++ b/src/rtl/trng_csprng.v
@@ -65,6 +65,19 @@ module trng_csprng(
//----------------------------------------------------------------
// Internal constant and parameter definitions.
//----------------------------------------------------------------
+ parameter ADDR_CTRL = 8'h10;
+ parameter CTRL_ENABLE_BIT = 0;
+ parameter CTRL_SEED_BIT = 1;
+
+ parameter ADDR_STATUS = 8'h11;
+ parameter STATUS_RND_VALID_BIT = 0;
+
+ parameter ADDR_RND_DATA = 8'h20;
+
+ parameter ADDR_NUM_ROUNDS = 8'h40;
+ parameter ADDR_NUM_BLOCKS_LOW = 8'h41;
+ parameter ADDR_NUM_BLOCKS_HIGH = 8'h42;
+
parameter CIPHER_KEYLEN256 = 1'b1; // 256 bit key.
parameter CIPHER_MAX_BLOCKS = 64'h1000000000000000;
@@ -82,19 +95,6 @@ module trng_csprng(
parameter DEFAULT_NUM_ROUNDS = 5'h18;
parameter DEFAULT_NUM_BLOCKS = 64'h1000000000000000;
- parameter ADDR_CTRL = 8'h10;
- parameter CTRL_ENABLE_BIT = 0;
- parameter CTRL_SEED_BIT = 1;
-
- parameter ADDR_STATUS = 8'h11;
- parameter STATUS_RND_VALID_BIT = 0;
-
- parameter ADDR_RND_DATA = 8'h20;
-
- parameter ADDR_NUM_ROUNDS = 8'h40;
- parameter ADDR_NUM_BLOCK_LOW = 8'h41;
- parameter ADDR_NUM_BLOCK_HIGH = 8'h42;
-
//----------------------------------------------------------------
// Registers including update variables and write enable.
@@ -253,7 +253,7 @@ module trng_csprng(
more_seed_reg <= 0;
seed_ack_reg <= 0;
ready_reg <= 0;
- enable_reg <= 0;
+ enable_reg <= 1;
seed_reg <= 0;
num_rounds_reg <= DEFAULT_NUM_ROUNDS;
num_blocks_low_reg <= DEFAULT_NUM_BLOCKS[31 : 0];
@@ -366,13 +366,13 @@ module trng_csprng(
num_rounds_we = 1;
end
- ADDR_NUM_BLOCK_LOW:
+ ADDR_NUM_BLOCKS_LOW:
begin
num_blocks_low_new = write_data;
num_blocks_low_we = 1;
end
- ADDR_NUM_BLOCK_HIGH:
+ ADDR_NUM_BLOCKS_HIGH:
begin
num_blocks_high_new = write_data;
num_blocks_high_we = 1;
@@ -411,12 +411,12 @@ module trng_csprng(
tmp_read_data = {27'h0000000, num_rounds_reg};
end
- ADDR_NUM_BLOCK_LOW:
+ ADDR_NUM_BLOCKS_LOW:
begin
tmp_read_data = num_blocks_low_reg;
end
- ADDR_NUM_BLOCK_HIGH:
+ ADDR_NUM_BLOCKS_HIGH:
begin
tmp_read_data = num_blocks_high_reg;
end
diff --git a/src/rtl/trng_mixer.v b/src/rtl/trng_mixer.v
index d11050c..821601b 100644
--- a/src/rtl/trng_mixer.v
+++ b/src/rtl/trng_mixer.v
@@ -49,6 +49,7 @@ module trng_mixer(
input wire discard,
input wire test_mode,
+ output wire security_error,
input wire more_seed,
@@ -81,13 +82,6 @@ module trng_mixer(
//----------------------------------------------------------------
parameter MODE_SHA_512 = 2'h3;
- parameter CTRL_IDLE = 4'h0;
- parameter CTRL_COLLECT = 4'h1;
- parameter CTRL_MIX = 4'h2;
- parameter CTRL_SYN = 4'h3;
- parameter CTRL_ACK = 4'h4;
- parameter CTRL_NEXT = 4'h5;
-
parameter ENTROPY_IDLE = 4'h0;
parameter ENTROPY_SRC0 = 4'h1;
parameter ENTROPY_SRC0_ACK = 4'h2;
@@ -96,11 +90,20 @@ module trng_mixer(
parameter ENTROPY_SRC2 = 4'h5;
parameter ENTROPY_SRC2_ACK = 4'h6;
+ parameter CTRL_IDLE = 4'h0;
+ parameter CTRL_COLLECT = 4'h1;
+ parameter CTRL_MIX = 4'h2;
+ parameter CTRL_SYN = 4'h3;
+ parameter CTRL_ACK = 4'h4;
+ parameter CTRL_NEXT = 4'h5;
+
parameter ADDR_MIXER_CTRL = 8'h10;
parameter MIXER_CTRL_ENABLE_BIT = 0;
parameter MIXER_CTRL_RESTART_BIT = 1;
-
parameter ADDR_MIXER_STATUS = 8'h11;
+ parameter ADDR_MIXER_TIMEOUT = 8'h20;
+
+ parameter DEFAULT_ENTROPY_TIMEOUT = 24'h800000;
//----------------------------------------------------------------
@@ -181,6 +184,17 @@ module trng_mixer(
reg [3 : 0] entropy_collect_ctrl_new;
reg entropy_collect_ctrl_we;
+ reg [23 : 0] entropy_timeout_ctr_reg;
+ reg [23 : 0] entropy_timeout_ctr_new;
+ reg entropy_timeout_ctr_inc;
+ reg entropy_timeout_ctr_rst;
+ reg entropy_timeout_ctr_we;
+ reg entropy_timeout;
+
+ reg [23 : 0] entropy_timeout_reg;
+ reg [23 : 0] entropy_timeout_new;
+ reg entropy_timeout_we;
+
reg [3 : 0] mixer_ctrl_reg;
reg [3 : 0] mixer_ctrl_new;
reg mixer_ctrl_we;
@@ -228,8 +242,9 @@ module trng_mixer(
//----------------------------------------------------------------
// Concurrent connectivity for ports etc.
//----------------------------------------------------------------
- assign read_data = tmp_read_data;
- assign error = tmp_error;
+ assign read_data = tmp_read_data;
+ assign error = tmp_error;
+ assign security_error = 0;
assign seed_syn = seed_syn_reg;
assign seed_data = hash_digest;
@@ -317,8 +332,10 @@ module trng_mixer(
init_done_reg <= 0;
word_ctr_reg <= 5'h00;
seed_syn_reg <= 0;
- enable_reg <= 0;
+ enable_reg <= 1;
restart_reg <= 0;
+ entropy_timeout_reg <= DEFAULT_ENTROPY_TIMEOUT;
+ entropy_timeout_ctr_reg <= 24'h000000;
entropy_collect_ctrl_reg <= CTRL_IDLE;
mixer_ctrl_reg <= CTRL_IDLE;
end
@@ -515,6 +532,16 @@ module trng_mixer(
begin
mixer_ctrl_reg <= mixer_ctrl_new;
end
+
+ if (entropy_timeout_we)
+ begin
+ entropy_timeout_reg <= entropy_timeout_new;
+ end
+
+ if (entropy_timeout_ctr_we)
+ begin
+ entropy_timeout_ctr_reg <= entropy_timeout_ctr_new;
+ end
end
end // reg_update
@@ -524,12 +551,14 @@ module trng_mixer(
//----------------------------------------------------------------
always @*
begin : mixer_api_logic
- enable_new = 0;
- enable_we = 0;
- restart_reg = 0;
- restart_new = 0;
- tmp_read_data = 32'h00000000;
- tmp_error = 0;
+ enable_new = 0;
+ enable_we = 0;
+ restart_reg = 0;
+ restart_new = 0;
+ entropy_timeout_new = 24'h000000;
+ entropy_timeout_we = 0;
+ tmp_read_data = 32'h00000000;
+ tmp_error = 0;
if (cs)
begin
@@ -545,6 +574,12 @@ module trng_mixer(
restart_new = write_data[MIXER_CTRL_RESTART_BIT];
end
+ ADDR_MIXER_TIMEOUT:
+ begin
+ entropy_timeout_new = write_data[23 : 0];
+ entropy_timeout_we = 1;
+ end
+
default:
begin
tmp_error = 1;
@@ -559,12 +594,17 @@ module trng_mixer(
// Read operations.
ADDR_MIXER_CTRL:
begin
- tmp_read_data = {30'h00000000, restart_reg, enable_reg};
+ tmp_read_data = {restart_reg, enable_reg};
end
ADDR_MIXER_STATUS:
begin
+ tmp_read_data = 32'h00000000;
+ end
+ ADDR_MIXER_TIMEOUT:
+ begin
+ tmp_read_data = entropy_timeout_reg;
end
default:
@@ -594,6 +634,8 @@ module trng_mixer(
update_block = 0;
block_done = 0;
muxed_entropy = 32'h00000000;
+ entropy_timeout_ctr_inc = 0;
+ entropy_timeout_ctr_rst = 0;
entropy_collect_ctrl_new = ENTROPY_IDLE;
entropy_collect_ctrl_we = 0;
@@ -603,6 +645,7 @@ module trng_mixer(
if (collect_block)
begin
word_ctr_rst = 1;
+ entropy_timeout_ctr_rst = 1;
entropy_collect_ctrl_new = ENTROPY_SRC0;
entropy_collect_ctrl_we = 1;
end
@@ -627,9 +670,21 @@ module trng_mixer(
entropy_collect_ctrl_new = ENTROPY_SRC0_ACK;
entropy_collect_ctrl_we = 1;
end
+ else
+ if (entropy_timeout)
+ begin
+ entropy_timeout_ctr_rst = 1;
+ entropy_collect_ctrl_new = ENTROPY_SRC1;
+ entropy_collect_ctrl_we = 1;
+ end
+ else
+ begin
+ entropy_timeout_ctr_inc = 1;
+ end
end
else
begin
+ entropy_timeout_ctr_rst = 1;
entropy_collect_ctrl_new = ENTROPY_SRC1;
entropy_collect_ctrl_we = 1;
end
@@ -682,6 +737,17 @@ module trng_mixer(
entropy_collect_ctrl_new = ENTROPY_SRC1_ACK;
entropy_collect_ctrl_we = 1;
end
+ else
+ if (entropy_timeout)
+ begin
+ entropy_timeout_ctr_rst = 1;
+ entropy_collect_ctrl_new = ENTROPY_SRC2;
+ entropy_collect_ctrl_we = 1;
+ end
+ else
+ begin
+ entropy_timeout_ctr_inc = 1;
+ end
end
else
begin
@@ -736,6 +802,17 @@ module trng_mixer(
entropy_collect_ctrl_new = ENTROPY_SRC2_ACK;
entropy_collect_ctrl_we = 1;
end
+ else
+ if (entropy_timeout)
+ begin
+ entropy_timeout_ctr_rst = 1;
+ entropy_collect_ctrl_new = ENTROPY_SRC0;
+ entropy_collect_ctrl_we = 1;
+ end
+ else
+ begin
+ entropy_timeout_ctr_inc = 1;
+ end
end
else
begin
@@ -854,6 +931,40 @@ module trng_mixer(
//----------------------------------------------------------------
+ // entropy_timeout_logic
+ //
+ // Logic that updates the entropy timeout counter and signals
+ // when the wait for antropy from a provider has exceeded
+ // acceptable time.
+ //----------------------------------------------------------------
+ always @*
+ begin : entropy_timeout_logic
+ entropy_timeout_ctr_new = 24'h000000;
+ entropy_timeout_ctr_we = 0;
+ entropy_timeout = 0;
+
+ if (entropy_timeout_ctr_reg == entropy_timeout_reg)
+ begin
+ entropy_timeout = 1;
+ entropy_timeout_ctr_new = 24'h000000;
+ entropy_timeout_ctr_we = 1;
+ end
+
+ if (entropy_timeout_ctr_rst)
+ begin
+ entropy_timeout_ctr_new = 24'h000000;
+ entropy_timeout_ctr_we = 1;
+ end
+
+ if (entropy_timeout_ctr_inc)
+ begin
+ entropy_timeout_ctr_new = entropy_timeout_ctr_reg + 1'b1;
+ entropy_timeout_ctr_we = 1;
+ end
+ end
+
+
+ //----------------------------------------------------------------
// word_ctr
//----------------------------------------------------------------
always @*
@@ -907,7 +1018,7 @@ module trng_mixer(
CTRL_COLLECT:
begin
- if ((!discard))
+ if ((discard))
begin
mixer_ctrl_new = CTRL_IDLE;
mixer_ctrl_we = 1;
@@ -924,7 +1035,7 @@ module trng_mixer(
CTRL_MIX:
begin
- if ((!discard))
+ if ((discard))
begin
mixer_ctrl_new = CTRL_IDLE;
mixer_ctrl_we = 1;
@@ -946,7 +1057,7 @@ module trng_mixer(
CTRL_SYN:
begin
- if ((!discard))
+ if ((discard))
begin
mixer_ctrl_new = CTRL_IDLE;
mixer_ctrl_we = 1;
@@ -963,7 +1074,7 @@ module trng_mixer(
CTRL_ACK:
begin
- if ((!discard))
+ if ((discard))
begin
mixer_ctrl_new = CTRL_IDLE;
mixer_ctrl_we = 1;
@@ -979,7 +1090,7 @@ module trng_mixer(
CTRL_NEXT:
begin
- if ((!discard))
+ if ((discard))
begin
mixer_ctrl_new = CTRL_IDLE;
mixer_ctrl_we = 1;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 07:32:49 +0000