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authorJoachim StroĢˆmbergson <joachim@secworks.se>2018-12-11 09:58:47 +0100
committerJoachim StroĢˆmbergson <joachim@secworks.se>2018-12-11 09:58:47 +0100
commit4665dcca8381b60a34ae2f47a2949822b4fbbf09 (patch)
tree020f5aa2a5316b4dcba1b26b18022aee7e5ff096 /src/tb
parent31ccc060dbd0ba6daa2eedb8911b40603b96a26f (diff)
Adding test case for auto_zeroise. Can see that a loaded key gets wiped after timeout. Status bits looks fishy though.
Diffstat (limited to 'src/tb')
-rw-r--r--src/tb/tb_keywrap.v158
1 files changed, 125 insertions, 33 deletions
diff --git a/src/tb/tb_keywrap.v b/src/tb/tb_keywrap.v
index 4d1c25c..867b4a3 100644
--- a/src/tb/tb_keywrap.v
+++ b/src/tb/tb_keywrap.v
@@ -51,38 +51,42 @@ module tb_keywrap();
// API for the core.
- localparam ADDR_NAME0 = 8'h00;
- localparam ADDR_NAME1 = 8'h01;
- localparam ADDR_VERSION = 8'h02;
+ localparam ADDR_NAME0 = 8'h00;
+ localparam ADDR_NAME1 = 8'h01;
+ localparam ADDR_VERSION = 8'h02;
- localparam ADDR_CTRL = 8'h08;
- localparam CTRL_INIT_BIT = 0;
- localparam CTRL_NEXT_BIT = 1;
+ localparam ADDR_CTRL = 8'h08;
+ localparam CTRL_INIT_BIT = 0;
+ localparam CTRL_NEXT_BIT = 1;
+ localparam CTRL_ZEROISE_BIT = 2;
- localparam ADDR_STATUS = 8'h09;
- localparam STATUS_READY_BIT = 0;
- localparam STATUS_VALID_BIT = 1;
+ localparam ADDR_STATUS = 8'h09;
+ localparam STATUS_READY_BIT = 0;
+ localparam STATUS_VALID_BIT = 1;
+ localparam STATUS_LOADED_BIT = 2;
- localparam ADDR_CONFIG = 8'h0a;
- localparam CTRL_ENCDEC_BIT = 0;
- localparam CTRL_KEYLEN_BIT = 1;
+ localparam ADDR_CONFIG = 8'h0a;
+ localparam CTRL_ENCDEC_BIT = 0;
+ localparam CTRL_KEYLEN_BIT = 1;
- localparam ADDR_RLEN = 8'h0c;
- localparam ADDR_R_BANK = 8'h0d;
- localparam ADDR_A0 = 8'h0e;
- localparam ADDR_A1 = 8'h0f;
+ localparam ADDR_TIMEOUT = 8'h0b;
- localparam ADDR_KEY0 = 8'h10;
- localparam ADDR_KEY1 = 8'h11;
- localparam ADDR_KEY2 = 8'h12;
- localparam ADDR_KEY3 = 8'h13;
- localparam ADDR_KEY4 = 8'h14;
- localparam ADDR_KEY5 = 8'h15;
- localparam ADDR_KEY6 = 8'h16;
- localparam ADDR_KEY7 = 8'h17;
+ localparam ADDR_RLEN = 8'h0c;
+ localparam ADDR_R_BANK = 8'h0d;
+ localparam ADDR_A0 = 8'h0e;
+ localparam ADDR_A1 = 8'h0f;
- localparam ADDR_R_DATA0 = 8'h80;
- localparam ADDR_R_DATA127 = 8'hff;
+ localparam ADDR_KEY0 = 8'h10;
+ localparam ADDR_KEY1 = 8'h11;
+ localparam ADDR_KEY2 = 8'h12;
+ localparam ADDR_KEY3 = 8'h13;
+ localparam ADDR_KEY4 = 8'h14;
+ localparam ADDR_KEY5 = 8'h15;
+ localparam ADDR_KEY6 = 8'h16;
+ localparam ADDR_KEY7 = 8'h17;
+
+ localparam ADDR_R_DATA0 = 8'h80;
+ localparam ADDR_R_DATA127 = 8'hff;
//----------------------------------------------------------------
@@ -1055,7 +1059,6 @@ module tb_keywrap();
endtask // test_kwp_ad_128_2
-
//----------------------------------------------------------------
// test_big_wrap_256
// Implements wrap test with a huge (16 kB+) data object
@@ -1142,6 +1145,93 @@ module tb_keywrap();
end
endtask // test_big_wrap_256
+ //----------------------------------------------------------------
+ // test_zeroise
+ // Test the auto_zeroise functionality. We test that:
+ // 1. We can init a key and have it auto zeroise.
+ // 2. We can init a key and keep it alive.
+ // 3. We can init a key and the force zeroisation.
+ //----------------------------------------------------------------
+ task test_zeroise;
+ begin : test_zeroise
+ integer i;
+ integer err;
+
+ err = 0;
+
+ $display("** TC test_zeroise START.");
+ $display("** Test 1: Auto zeroise.");
+
+ tc_ctr = tc_ctr + 1;
+
+ // Write key and keylength, we also want to encrypt/wrap.
+ write_word(ADDR_KEY0, 32'h55aa55aa);
+ write_word(ADDR_KEY1, 32'h55aa55aa);
+ write_word(ADDR_KEY2, 32'h55aa55aa);
+ write_word(ADDR_KEY3, 32'h55aa55aa);
+ write_word(ADDR_KEY4, 32'h55aa55aa);
+ write_word(ADDR_KEY5, 32'h55aa55aa);
+ write_word(ADDR_KEY6, 32'h55aa55aa);
+ write_word(ADDR_KEY7, 32'h55aa55aa);
+ write_word(ADDR_CONFIG, 32'h00000003);
+
+ read_word(ADDR_STATUS);
+ $display("Status register: 0x%032b", read_data);
+
+ // Set the key timeout to 6 * 16 = 96 cycles.
+ write_word(ADDR_TIMEOUT, 32'h00000006);
+
+ $display("Contents of the key_mem[2]: 0x%016x",
+ dut.core.aes.keymem.key_mem[2]);
+
+ // Initialize the AES engine (to expand the key).
+ // Wait for init to complete.
+ // Note, not actually needed to wait. We can write R data during init.
+ $display("* Initializing.");
+ write_word(ADDR_CTRL, 32'h00000001);
+ #(2 * CLK_PERIOD);
+ wait_ready();
+ $display("* Init done.");
+
+ // Display contents in one of the key expansion registers
+ $display("Contents of the key_mem[2]: 0x%016x",
+ dut.core.aes.keymem.key_mem[2]);
+
+ // Check if key is loaded, according to the loaded flag.
+ read_word(ADDR_STATUS);
+ $display("Status register: 0x%032b", read_data);
+
+ // Display the counter a few times.
+ $display("Contents of the key_mem[2]: 0x%05x",
+ dut.core.key_timeout_ctr_reg);
+ #(10 * CLK_PERIOD);
+ $display("Contents of the key_mem[2]: 0x%05x",
+ dut.core.key_timeout_ctr_reg);
+ #(10 * CLK_PERIOD);
+ $display("Contents of the key_mem[2]: 0x%05x",
+ dut.core.key_timeout_ctr_reg);
+ #(10 * CLK_PERIOD);
+ $display("Contents of the key_mem[2]: 0x%05x",
+ dut.core.key_timeout_ctr_reg);
+ #(10 * CLK_PERIOD);
+
+ read_word(ADDR_STATUS);
+ $display("Status register: 0x%032b", read_data);
+
+ // Display contents in one of the key expansion registers
+ $display("Contents of the key_mem[2]: 0x%016x",
+ dut.core.aes.keymem.key_mem[2]);
+
+ #(40 * CLK_PERIOD);
+
+ read_word(ADDR_STATUS);
+ $display("Status register: 0x%032b", read_data);
+
+
+ $display("** TC test_zeroise END.\n");
+ end
+ endtask // test_zeroise
+
//----------------------------------------------------------------
// main
@@ -1162,14 +1252,16 @@ module tb_keywrap();
reset_dut();
dump_dut_state();
- test_core_access();
+// test_core_access();
+
+// test_kwp_ae_128_1();
+// test_kwp_ad_128_1();
+// test_kwp_ae_128_2();
+// test_kwp_ad_128_2();
- test_kwp_ae_128_1();
- test_kwp_ad_128_1();
- test_kwp_ae_128_2();
- test_kwp_ad_128_2();
+// test_big_wrap_256();
- test_big_wrap_256();
+ test_zeroise();
display_test_results();