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-rw-r--r--src/rtl/trng.v539
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+//======================================================================
+//
+// trng.v
+// --------
+// Top level wrapper for the True Random Number Generator.
+//
+//
+// Author: Joachim Strombergson
+// Copyright (c) 2014, NORDUnet A/S All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+// - Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// - Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may
+// be used to endorse or promote products derived from this software
+// without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+//======================================================================
+
+module trng(
+ // Clock and reset.
+ input wire clk,
+ input wire reset_n,
+
+ input wire avalanche_noise,
+
+ input wire cs,
+ input wire we,
+ input wire [7 : 0] address,
+ input wire [31 : 0] write_data,
+ output wire [31 : 0] read_data,
+ output wire error,
+
+ output wire security_error
+ );
+
+
+ //----------------------------------------------------------------
+ // Internal constant and parameter definitions.
+ //----------------------------------------------------------------
+ parameter ADDR_NAME0 = 8'h00;
+ parameter ADDR_NAME1 = 8'h01;
+ parameter ADDR_VERSION = 8'h02;
+
+ parameter ADDR_TRNG_CTRL = 8'h10;
+ parameter TRNG_CTRL_ENABLE_BIT = 0;
+ parameter TRNG_CTRL_ENT0_ENABLE_BIT = 1;
+ parameter TRNG_CTRL_ENT1_ENABLE_BIT = 2;
+ parameter TRNG_CTRL_ENT2_ENABLE_BIT = 3;
+ parameter TRNG_CTRL_SEED_BIT = 8;
+
+ parameter ADDR_TRNG_STATUS = 8'h11;
+
+ parameter ADDR_TRNG_RND_DATA = 8'h20;
+ parameter ADDR_TRNG_RND_DATA_VALID = 8'h21;
+ parameter TRNG_RND_VALID_BIT = 0;
+
+ parameter ADDR_CSPRNG_NUM_ROUNDS = 8'h30;
+ parameter ADDR_CSPRNG_NUM_BLOCKS_LOW = 8'h31;
+ parameter ADDR_CSPRNG_NUM_BLOCKS_HIGH = 8'h32;
+
+ parameter ADDR_ENTROPY0_RAW = 8'h40;
+ parameter ADDR_ENTROPY0_STATS = 8'h41;
+
+ parameter ADDR_ENTROPY1_RAW = 8'h50;
+ parameter ADDR_ENTROPY1_STATS = 8'h51;
+
+ parameter ADDR_ENTROPY2_RAW = 8'h60;
+ parameter ADDR_ENTROPY2_STATS = 8'h61;
+
+
+ parameter TRNG_NAME0 = 32'h74726e67; // "trng"
+ parameter TRNG_NAME1 = 32'h20202020; // " "
+ parameter TRNG_VERSION = 32'h302e3031; // "0.01"
+
+
+ parameter CSPRNG_DEFAULT_NUM_ROUNDS = 5'h18;
+ parameter CSPRNG_DEFAULT_NUM_BLOCKS = 64'h1000000000000000;
+
+
+ //----------------------------------------------------------------
+ // Registers including update variables and write enable.
+ //----------------------------------------------------------------
+ reg [4 : 0] csprng_num_rounds_reg;
+ reg [4 : 0] csprng_num_rounds_new;
+ reg csprng_num_rounds_we;
+
+ reg [31 : 0] csprng_num_blocks_low_reg;
+ reg [31 : 0] csprng_num_blocks_low_new;
+ reg csprng_num_blocks_low_we;
+
+ reg [31 : 0] csprng_num_blocks_high_reg;
+ reg [31 : 0] csprng_num_blocks_high_new;
+ reg csprng_num_blocks_high_we;
+
+ reg entropy0_enable_reg;
+ reg entropy0_enable_new;
+ reg entropy0_enable_we;
+
+ reg entropy1_enable_reg;
+ reg entropy1_enable_new;
+ reg entropy1_enable_we;
+
+ reg entropy2_enable_reg;
+ reg entropy2_enable_new;
+ reg entropy2_enable_we;
+
+ reg enable_reg;
+ reg enable_new;
+ reg enable_we;
+
+ reg csprng_seed_reg;
+ reg csprng_seed_new;
+
+ reg csprng_rnd_ack_reg;
+ reg csprng_rnd_ack_new;
+
+
+
+ //----------------------------------------------------------------
+ // Wires.
+ //----------------------------------------------------------------
+ wire entropy0_enable;
+ wire [31 : 0] entropy0_raw;
+ wire [31 : 0] entropy0_stats;
+ wire entropy0_enabled;
+ wire entropy0_syn;
+ wire [31 : 0] entropy0_data;
+ wire entropy0_ack;
+
+ wire entropy1_enable;
+ wire [31 : 0] entropy1_raw;
+ wire [31 : 0] entropy1_stats;
+ wire entropy1_enabled;
+ wire entropy1_syn;
+ wire [31 : 0] entropy1_data;
+ wire entropy1_ack;
+
+ wire entropy2_enable;
+ wire [31 : 0] entropy2_raw;
+ wire [31 : 0] entropy2_stats;
+ wire entropy2_enabled;
+ wire entropy2_syn;
+ wire [31 : 0] entropy2_data;
+ wire entropy2_ack;
+
+ reg mixer_enable;
+ wire [511 : 0] mixer_seed_data;
+ wire mixer_seed_syn;
+ wire mixer_seed_ack;
+
+ wire csprng_enable;
+ wire csprng_debug_mode;
+ wire [4 : 0] csprng_num_rounds;
+ wire [63 : 0] csprng_num_blocks;
+ wire csprng_seed;
+ wire csprng_more_seed;
+ wire csprng_ready;
+ wire csprng_error;
+ wire [31 : 0] csprng_rnd_data;
+ wire csprng_rnd_syn;
+
+ reg [31 : 0] tmp_read_data;
+ reg tmp_error;
+
+
+ //----------------------------------------------------------------
+ // Concurrent connectivity for ports etc.
+ //----------------------------------------------------------------
+ assign read_data = tmp_read_data;
+ assign error = tmp_error;
+ assign security_error = 0;
+
+ assign csprng_num_blocks = {csprng_num_blocks_high_reg,
+ csprng_num_blocks_low_reg};
+
+ assign entropy0_enable = entropy0_enable_reg;
+ assign entropy1_enable = entropy1_enable_reg;
+ assign entropy2_enable = entropy2_enable_reg;
+
+
+ //----------------------------------------------------------------
+ // core instantiations.
+ //----------------------------------------------------------------
+ trng_mixer mixer(
+ .clk(clk),
+ .reset_n(reset_n),
+
+ .enable(mixer_enable),
+ .more_seed(csprng_more_seed),
+
+ .entropy0_enabled(entropy0_enabled),
+ .entropy0_syn(entropy0_syn),
+ .entropy0_data(entropy0_data),
+ .entropy0_ack(entropy0_ack),
+
+ .entropy1_enabled(entropy1_enabled),
+ .entropy1_syn(entropy1_syn),
+ .entropy1_data(entropy1_data),
+ .entropy1_ack(entropy1_ack),
+
+ .entropy2_enabled(entropy2_enabled),
+ .entropy2_syn(entropy2_syn),
+ .entropy2_data(entropy2_data),
+ .entropy2_ack(entropy2_ack),
+
+ .seed_data(mixer_seed_data),
+ .seed_syn(mixer_seed_syn),
+ .seed_ack(mixer_seed_ack)
+ );
+
+ trng_csprng csprng(
+ .clk(clk),
+ .reset_n(reset_n),
+
+ .enable(csprng_enable),
+ .debug_mode(csprng_debug_mode),
+ .num_rounds(csprng_num_rounds_reg),
+ .num_blocks(csprng_num_blocks),
+ .seed(csprng_seed),
+ .more_seed(csprng_more_seed),
+ .ready(csprng_ready),
+ .error(csprng_error),
+
+ .seed_data(mixer_seed_data),
+ .seed_syn(mixer_seed_syn),
+ .seed_ack(csprng_seed_ack),
+
+ .rnd_data(csprng_rnd_data),
+ .rnd_syn(csprng_rnd_syn),
+ .rnd_ack(csprng_rnd_ack_reg)
+ );
+
+ pseudo_entropy entropy0(
+ .clk(clk),
+ .reset_n(reset_n),
+
+ .enable(entropy0_enable),
+
+ .raw_entropy(entropy0_raw),
+ .stats(entropy0_stats),
+
+ .enabled(entropy0_enabled),
+ .entropy_syn(entropy0_syn),
+ .entropy_data(entropy0_data),
+ .entropy_ack(entropy0_ack)
+ );
+
+ avalance_entropy entropy1(
+ .clk(clk),
+ .reset_n(reset_n),
+
+ .enable(entropy1_enable),
+
+ .noise(avalanche_noise),
+
+ .raw_entropy(entropy1_raw),
+ .stats(entropy1_stats),
+
+ .enabled(entropy1_enabled),
+ .entropy_syn(entropy1_syn),
+ .entropy_data(entropy1_data),
+ .entropy_ack(entropy1_ack)
+ );
+
+ ringosc_entropy entropy2(
+ .clk(clk),
+ .reset_n(reset_n),
+
+ .enable(entropy2_enable),
+
+ .raw_entropy(entropy2_raw),
+ .stats(entropy2_stats),
+
+ .enabled(entropy2_enabled),
+ .entropy_syn(entropy2_syn),
+ .entropy_data(entropy2_data),
+ .entropy_ack(entropy2_ack)
+ );
+
+
+ //----------------------------------------------------------------
+ // reg_update
+ //
+ // Update functionality for all registers in the core.
+ // All registers are positive edge triggered with asynchronous
+ // active low reset. All registers have write enable.
+ //----------------------------------------------------------------
+ always @ (posedge clk or negedge reset_n)
+ begin
+ if (!reset_n)
+ begin
+ entropy0_enable_reg <= 1;
+ entropy1_enable_reg <= 1;
+ entropy2_enable_reg <= 1;
+ enable_reg <= 1;
+ csprng_rnd_ack_reg <= 0;
+ csprng_seed_reg <= 0;
+ csprng_num_rounds_reg <= CSPRNG_DEFAULT_NUM_ROUNDS;
+ csprng_num_blocks_low_reg <= CSPRNG_DEFAULT_NUM_BLOCKS[31 : 0];
+ csprng_num_blocks_high_reg <= CSPRNG_DEFAULT_NUM_BLOCKS[63 : 32];
+ end
+
+ else
+ begin
+ csprng_rnd_ack_reg <= csprng_rnd_ack_new;
+ csprng_seed_reg <= csprng_seed_new;
+
+ if (entropy0_enable_we)
+ begin
+ entropy0_enable_reg <= entropy0_enable_new;
+ end
+
+ if (entropy1_enable_we)
+ begin
+ entropy1_enable_reg <= entropy1_enable_new;
+ end
+
+ if (entropy2_enable_we)
+ begin
+ entropy2_enable_reg <= entropy2_enable_new;
+ end
+
+ if (enable_we)
+ begin
+ enable_reg <= enable_new;
+ end
+
+ if (csprng_num_rounds_we)
+ begin
+ csprng_num_rounds_reg <= csprng_num_rounds_new;
+ end
+
+ if (csprng_num_blocks_low_we)
+ begin
+ csprng_num_blocks_low_reg <= csprng_num_blocks_low_new;
+ end
+
+ if (csprng_num_blocks_high_we)
+ begin
+ csprng_num_blocks_high_reg <= csprng_num_blocks_high_new;
+ end
+ end
+ end // reg_update
+
+
+ //----------------------------------------------------------------
+ // api_logic
+ //
+ // Implementation of the api logic. If cs is enabled will either
+ // try to write to or read from the internal registers.
+ //----------------------------------------------------------------
+ always @*
+ begin : api_logic
+ entropy0_enable_new = 0;
+ entropy0_enable_we = 0;
+ entropy1_enable_new = 0;
+ entropy1_enable_we = 0;
+ entropy2_enable_new = 0;
+ entropy2_enable_we = 0;
+ enable_new = 0;
+ enable_we = 0;
+ csprng_seed_new = 0;
+ csprng_rnd_ack_new = 0;
+ csprng_seed_new = 0;
+ csprng_num_rounds_new = 5'h00;
+ csprng_num_rounds_we = 0;
+ csprng_num_blocks_low_new = 32'h00000000;
+ csprng_num_blocks_low_we = 0;
+ csprng_num_blocks_high_new = 32'h00000000;
+ csprng_num_blocks_high_we = 0;
+ tmp_read_data = 32'h00000000;
+ tmp_error = 0;
+
+ if (cs)
+ begin
+ if (we)
+ begin
+ case (address)
+ // Write operations.
+ ADDR_TRNG_CTRL:
+ begin
+ enable_new = write_data[TRNG_CTRL_ENABLE_BIT];
+ enable_we = 1;
+ entropy0_enable_new = write_data[TRNG_CTRL_ENT0_ENABLE_BIT];
+ entropy0_enable_we = 1;
+ entropy1_enable_new = write_data[TRNG_CTRL_ENT1_ENABLE_BIT];
+ entropy1_enable_we = 1;
+ entropy2_enable_new = write_data[TRNG_CTRL_ENT2_ENABLE_BIT];
+ entropy2_enable_we = 1;
+ csprng_seed_new = write_data[TRNG_CTRL_SEED_BIT];
+ end
+
+ ADDR_CSPRNG_NUM_ROUNDS:
+ begin
+ csprng_num_rounds_new = write_data[4 : 0];
+ csprng_num_rounds_we = 1;
+ end
+
+ ADDR_CSPRNG_NUM_BLOCKS_LOW:
+ begin
+ csprng_num_blocks_low_new = write_data;
+ csprng_num_blocks_low_we = 1;
+ end
+
+ ADDR_CSPRNG_NUM_BLOCKS_HIGH:
+ begin
+ csprng_num_blocks_high_new = write_data;
+ csprng_num_blocks_high_we = 1;
+ end
+
+ default:
+ begin
+ tmp_error = 1;
+ end
+ endcase // case (address)
+ end // if (we)
+
+ else
+ begin
+ case (address)
+ // Read operations.
+ ADDR_NAME0:
+ begin
+ tmp_read_data = TRNG_NAME0;
+ end
+
+ ADDR_NAME1:
+ begin
+ tmp_read_data = TRNG_NAME1;
+ end
+
+ ADDR_VERSION:
+ begin
+ tmp_read_data = TRNG_VERSION;
+ end
+
+ ADDR_TRNG_CTRL:
+ begin
+ tmp_read_data[TRNG_CTRL_ENABLE_BIT] = enable_reg;
+ tmp_read_data[TRNG_CTRL_ENT0_ENABLE_BIT] = entropy0_enable_reg;
+ tmp_read_data[TRNG_CTRL_ENT1_ENABLE_BIT] = entropy1_enable_reg;
+ tmp_read_data[TRNG_CTRL_ENT2_ENABLE_BIT] = entropy2_enable_reg;
+ tmp_read_data[TRNG_CTRL_SEED_BIT] = csprng_seed_reg;
+ end
+
+ ADDR_TRNG_STATUS:
+ begin
+
+ end
+
+ ADDR_TRNG_RND_DATA:
+ begin
+ csprng_rnd_ack_new = 1;
+ tmp_read_data = csprng_rnd_data;
+ end
+
+ ADDR_TRNG_RND_DATA_VALID:
+ begin
+ tmp_read_data[TRNG_RND_VALID_BIT] = csprng_rnd_syn;
+ end
+
+ ADDR_CSPRNG_NUM_ROUNDS:
+ begin
+ tmp_read_data[4 : 0] = csprng_num_rounds_reg;
+ end
+
+ ADDR_CSPRNG_NUM_BLOCKS_LOW:
+ begin
+ tmp_read_data = csprng_num_blocks_low_reg;
+ end
+
+ ADDR_CSPRNG_NUM_BLOCKS_HIGH:
+ begin
+ tmp_read_data = csprng_num_blocks_high_reg;
+ end
+
+ ADDR_ENTROPY0_RAW:
+ begin
+ tmp_read_data = entropy0_raw;
+ end
+
+ ADDR_ENTROPY0_STATS:
+ begin
+ tmp_read_data = entropy0_stats;
+ end
+
+ ADDR_ENTROPY1_RAW:
+ begin
+ tmp_read_data = entropy1_raw;
+ end
+
+ ADDR_ENTROPY1_STATS:
+ begin
+ tmp_read_data = entropy1_stats;
+ end
+
+ ADDR_ENTROPY2_RAW:
+ begin
+ tmp_read_data = entropy2_raw;
+ end
+
+ ADDR_ENTROPY2_STATS:
+ begin
+ tmp_read_data = entropy2_stats;
+ end
+
+ default:
+ begin
+ tmp_error = 1;
+ end
+ endcase // case (address)
+ end
+ end
+ end // addr_decoder
+endmodule // trng
+
+//======================================================================
+// EOF trng.v
+//======================================================================
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