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authorPaul Selkirk <paul@psgd.org>2021-06-06 22:04:55 -0400
committerPaul Selkirk <paul@psgd.org>2021-06-06 22:48:09 -0400
commit2e38d480fa2767b2501a477766149476b0d03537 (patch)
tree072e21b6c999b257922c5e1dbd29d282950f74bd /src/tb
parent4c32ceb2f2df74de8996b9a76667643feb18f4e6 (diff)
The SHA-3 algorithm really wants everything to be little-endian, which is
at odds with everything else in our system (including the register interface to sha3_wrapper). Rather than trying to rewrite sha3, I'll isolate it in its own little-endian universe by byte-swapping all reads and writes.
Diffstat (limited to 'src/tb')
-rw-r--r--src/tb/tb_sha3.v24
1 files changed, 9 insertions, 15 deletions
diff --git a/src/tb/tb_sha3.v b/src/tb/tb_sha3.v
index 28d06a3..5dd93c4 100644
--- a/src/tb/tb_sha3.v
+++ b/src/tb/tb_sha3.v
@@ -239,8 +239,8 @@ module tb_sha3();
for (i=0; i<50; i=i+1) begin
case (i)
- 0: tb_wr_data = 32'h00000006; // ...0001 | 10
- block_words-1: tb_wr_data = 32'h80000000; // 1000...
+ 0: tb_wr_data = 32'h06000000; // ...0001 | 10
+ block_words-1: tb_wr_data = 32'h00000080; // 1000...
default: tb_wr_data = 32'h00000000;
endcase
tb_addr = {1'b0, i[5:0]}; // increment address
@@ -266,9 +266,7 @@ module tb_sha3();
tb_addr = {1'b1, i[5:0]};
#(CLK_PERIOD);
- // swap bytes in the read value
- for (j=31; j>0; j=j-8)
- hash_word[j-:8] = tb_rd_data[31-j+:8];
+ hash_word = tb_rd_data;
$display(" *** hash_word[%0d]: reference = %08x, calculated = %08x",
i, hash_shreg[511-:32], hash_word);
@@ -323,8 +321,8 @@ module tb_sha3();
for (i=0; i<50; i=i+1) begin
case (i)
- 0: tb_wr_data = 32'h06636261; // ...0001 | 10 | 'cba'
- block_words-1: tb_wr_data = 32'h80000000; // 1000...
+ 0: tb_wr_data = 32'h61626306; // ...0001 | 10 | 'cba'
+ block_words-1: tb_wr_data = 32'h00000080; // 1000...
default: tb_wr_data = 32'h00000000;
endcase
tb_addr = {1'b0, i[5:0]}; // increment address
@@ -350,9 +348,7 @@ module tb_sha3();
tb_addr = {1'b1, i[5:0]};
#(CLK_PERIOD);
- // swap bytes in the read value
- for (j=31; j>0; j=j-8)
- hash_word[j-:8] = tb_rd_data[31-j+:8];
+ hash_word = tb_rd_data;
$display(" *** hash_word[%0d]: reference = %08x, calculated = %08x",
i, hash_shreg[511-:32], hash_word);
@@ -440,14 +436,14 @@ module tb_sha3();
total_bits = total_bits - 32;
end else if (total_bits == 0) begin
// padding
- tb_wr_data = 32'h00000006;
+ tb_wr_data = 32'h06000000;
tb_addr = {1'b0, i[5:0]};
tb_we = 1;
#(CLK_PERIOD);
total_bits = total_bits - 32;
end else if (i == (block_words-1)) begin
// more padding
- tb_wr_data = 32'h80000000;
+ tb_wr_data = 32'h00000080;
tb_addr = {1'b0, i[5:0]};
tb_we = 1;
#(CLK_PERIOD);
@@ -482,9 +478,7 @@ module tb_sha3();
tb_addr = {1'b1, i[5:0]};
#(CLK_PERIOD);
- // swap bytes in the read value
- for (j=31; j>0; j=j-8)
- hash_word[j-:8] = tb_rd_data[31-j+:8];
+ hash_word = tb_rd_data;
$display(" *** hash_word[%0d]: reference = %08x, calculated = %08x",
i, hash_shreg[511-:32], hash_word);