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authorJoachim StroĢˆmbergson <joachim@secworks.se>2018-10-19 14:08:35 +0200
committerJoachim StroĢˆmbergson <joachim@secworks.se>2018-10-19 14:08:35 +0200
commitd97c71c3ec62a881b7632db29f15550c9ca374e9 (patch)
tree80f3b1ad6135975e8bc51642728a31e7b7c9c6cc /src
parentf34d659c9c8634845ff406eaa0f261a2db537edc (diff)
Locked down API write and API digest read access to only be allowed when the core is ready and not busy doing processing.
Diffstat (limited to 'src')
-rw-r--r--src/rtl/sha512.v116
1 files changed, 58 insertions, 58 deletions
diff --git a/src/rtl/sha512.v b/src/rtl/sha512.v
index 085783b..6356a8c 100644
--- a/src/rtl/sha512.v
+++ b/src/rtl/sha512.v
@@ -318,84 +318,86 @@ module sha512(
begin
if (we)
begin
- if ((address >= ADDR_BLOCK0) && (address <= ADDR_BLOCK31))
- block_we = 1'h1;
+ if (core_ready)
+ begin
+ if ((address >= ADDR_BLOCK0) && (address <= ADDR_BLOCK31))
+ block_we = 1'h1;
- case (address)
- ADDR_CTRL:
- begin
- init_new = write_data[CTRL_INIT_BIT];
- next_new = write_data[CTRL_NEXT_BIT];
- mode_new = write_data[CTRL_MODE_HIGH_BIT : CTRL_MODE_LOW_BIT];
- mode_we = 1'h1;
- work_factor_new = write_data[CTRL_WORK_FACTOR_BIT];
- work_factor_we = 1'h1;
- end
+ case (address)
+ ADDR_CTRL:
+ begin
+ init_new = write_data[CTRL_INIT_BIT];
+ next_new = write_data[CTRL_NEXT_BIT];
+ mode_new = write_data[CTRL_MODE_HIGH_BIT : CTRL_MODE_LOW_BIT];
+ mode_we = 1'h1;
+ work_factor_new = write_data[CTRL_WORK_FACTOR_BIT];
+ work_factor_we = 1'h1;
+ end
- ADDR_WORK_FACTOR_NUM:
- begin
- work_factor_num_we = 1;
- end
+ ADDR_WORK_FACTOR_NUM:
+ begin
+ work_factor_num_we = 1;
+ end
- ADDR_DIGEST0:
- state00_we = 1;
+ ADDR_DIGEST0:
+ state00_we = 1;
- ADDR_DIGEST1:
- state01_we = 1;
+ ADDR_DIGEST1:
+ state01_we = 1;
- ADDR_DIGEST2:
- state02_we = 1;
+ ADDR_DIGEST2:
+ state02_we = 1;
- ADDR_DIGEST3:
- state03_we = 1;
+ ADDR_DIGEST3:
+ state03_we = 1;
- ADDR_DIGEST4:
- state04_we = 1;
+ ADDR_DIGEST4:
+ state04_we = 1;
- ADDR_DIGEST5:
- state05_we = 1;
+ ADDR_DIGEST5:
+ state05_we = 1;
- ADDR_DIGEST6:
- state06_we = 1;
+ ADDR_DIGEST6:
+ state06_we = 1;
- ADDR_DIGEST7:
- state07_we = 1;
+ ADDR_DIGEST7:
+ state07_we = 1;
- ADDR_DIGEST8:
- state08_we = 1;
+ ADDR_DIGEST8:
+ state08_we = 1;
- ADDR_DIGEST9:
- state09_we = 1;
+ ADDR_DIGEST9:
+ state09_we = 1;
- ADDR_DIGEST10:
- state10_we = 1;
+ ADDR_DIGEST10:
+ state10_we = 1;
- ADDR_DIGEST11:
- state11_we = 1;
+ ADDR_DIGEST11:
+ state11_we = 1;
- ADDR_DIGEST12:
- state12_we = 1;
+ ADDR_DIGEST12:
+ state12_we = 1;
- ADDR_DIGEST13:
- state13_we = 1;
+ ADDR_DIGEST13:
+ state13_we = 1;
- ADDR_DIGEST14:
- state14_we = 1;
+ ADDR_DIGEST14:
+ state14_we = 1;
- ADDR_DIGEST15:
- state15_we = 1;
+ ADDR_DIGEST15:
+ state15_we = 1;
- default:
- begin
- tmp_error = 1;
- end
- endcase // case (address)
+ default:
+ tmp_error = 1;
+ endcase // case (address)
+ end // if (core_ready)
end // if (we)
else
begin
- if ((address >= ADDR_DIGEST0) && (address <= ADDR_DIGEST15))
- tmp_read_data = digest_reg[(15 - (address - ADDR_DIGEST0)) * 32 +: 32];
+ if (core_ready)
+ if ((address >= ADDR_DIGEST0) && (address <= ADDR_DIGEST15))
+ tmp_read_data = digest_reg[(15 - (address - ADDR_DIGEST0)) * 32 +: 32];
if ((address >= ADDR_BLOCK0) && (address <= ADDR_BLOCK31))
tmp_read_data = block_reg[address[4 : 0]];
@@ -420,9 +422,7 @@ module sha512(
tmp_read_data = work_factor_num_reg;
default:
- begin
- tmp_error = 1;
- end
+ tmp_error = 1;
endcase // case (address)
end
end