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Update CTR-AES testbench to use openSSL as reference, unpolished

master
T. Meissner 8 months ago
parent
commit
4c3aa07711
3 changed files with 211 additions and 23 deletions
  1. +3
    -2
      ctraes/sim/vhdl/Makefile
  2. +164
    -0
      ctraes/sim/vhdl/tb_ctraes.c
  3. +44
    -21
      ctraes/sim/vhdl/tb_ctraes.vhd

+ 3
- 2
ctraes/sim/vhdl/Makefile View File

@ -29,6 +29,7 @@ RTL_SRC := \
SIM_SRC := tb_$(DESIGN_NAME).vhd
C_SRC := tb_ctraes.c
OSVVM_DIR := ../../../lib/osvvm
@ -72,11 +73,11 @@ osvvm/OsvvmContext.o: $(OSVVM_SRC) | osvvm
ghdl -a --std=$(VHD_STD) -Wno-hide --work=osvvm --workdir=osvvm $(OSVVM_SRC)
tb_$(DESIGN_NAME): ${RTL_SRC} ${SIM_SRC} osvvm/OsvvmContext.o | work
tb_$(DESIGN_NAME): ${RTL_SRC} ${SIM_SRC} ${C_SRC} osvvm/OsvvmContext.o | work
@echo "Analyze testbench & design ..."
ghdl -a --std=$(VHD_STD) -fpsl --workdir=work -P=osvvm ${RTL_SRC} ${SIM_SRC}
@echo "Elaborate testbench & design ..."
ghdl -e --std=$(VHD_STD) -fpsl --workdir=work -P=osvvm $@
ghdl -e --std=$(VHD_STD) -fpsl --workdir=work -P=osvvm -Wl,$@.c -Wl,-lcrypto -Wl,-lssl $@
tb_$(DESIGN_NAME).ghw: tb_$(DESIGN_NAME)


+ 164
- 0
ctraes/sim/vhdl/tb_ctraes.c View File

@ -0,0 +1,164 @@
#include <stdio.h>
#include <string.h>
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>
static const char HDL_LOGIC_CHAR[] = { 'U', 'X', '0', '1', 'Z', 'W', 'L', 'H', '-'};
enum HDL_LOGIC_STATES {
HDL_U = 0,
HDL_X = 1,
HDL_0 = 2,
HDL_1 = 3,
HDL_Z = 4,
HDL_W = 5,
HDL_L = 6,
HDL_H = 7,
HDL_D = 8,
};
EVP_CIPHER_CTX *ctx;
void slv_to_uchar(char* datain, unsigned char* dataout, int bytelen) {
for (int i = 0; i < bytelen; i++) {
for (int y = 0; y < 8; y++) {
if (*datain == HDL_1) {
*dataout |= 1 << y;
} else if (*datain == HDL_0) {
*dataout &= ~(1 << y);
}
datain++;
}
dataout++;
}
return;
}
void slv_to_string(char* datain, char* dataout, int bytelen) {
for (int i = 0; i < bytelen; i++) {
*dataout = HDL_LOGIC_CHAR[*datain];
datain++;
dataout++;
}
return;
}
void uchar_to_slv(unsigned char* datain, char* dataout, int bytelen) {
for (int i = 0; i < bytelen; i++) {
for (int y = 0; y < 8; y++) {
if ((*datain >> y) & 1 == 1) {
*dataout = HDL_1 ;
} else {
*dataout = HDL_0;
}
dataout++;
}
datain++;
}
return;
}
void handleErrors(void) {
ERR_print_errors_fp(stderr);
abort();
}
void init(unsigned char *key, unsigned char *iv) {
// Create and initialise the context
if(!(ctx = EVP_CIPHER_CTX_new()))
handleErrors();
// Initialise the encryption operation, no IV needed in CTR mode
if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_128_ctr(), NULL, key, iv))
handleErrors();
// We don't want padding
if(1 != EVP_CIPHER_CTX_set_padding(ctx, 0))
handleErrors();
}
int encrypt(unsigned char *plaintext,
int plaintext_len,
unsigned char *ciphertext) {
int len = 0;
// Provide the message to be encrypted, and obtain the encrypted output
if (1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len))
handleErrors();
return len;
}
int finalize(void) {
int len = 0;
unsigned char data[16];
// Finalise the encryption. No further bytes are written as padding is switched off
if (1 != EVP_EncryptFinal_ex(ctx, data, &len))
handleErrors();
// Clean up
EVP_CIPHER_CTX_free(ctx);
return len;
}
void cryptData(char* datain, char* key, char* iv, char start, char final, char* dataout, int bytelen) {
int crypt_len;
unsigned char c_din[bytelen];
unsigned char c_key[bytelen];
unsigned char c_iv[bytelen];
unsigned char c_dout[bytelen];
slv_to_uchar(datain, c_din, bytelen);
slv_to_uchar(key, c_key, bytelen);
slv_to_uchar(iv, c_iv, bytelen);
if (start) {
init(c_key, c_iv);
}
crypt_len = encrypt(c_din, bytelen, c_dout);
if (crypt_len != bytelen) {
printf("Warning: encrypt() returned with unexpected length %d\n", crypt_len);
}
if (final) {
crypt_len = finalize();
if (crypt_len != 0) {
printf("Warning: finalize() returned with unexpected length %d\n", crypt_len);
}
}
uchar_to_slv(c_dout, dataout, bytelen);
return;
}

+ 44
- 21
ctraes/sim/vhdl/tb_ctraes.vhd View File

@ -52,6 +52,29 @@ architecture sim of tb_ctraes is
signal s_validout : std_logic := '0';
signal s_acceptout : std_logic := '0';
procedure cryptData(datain : in std_logic_vector(0 to 127);
key : in std_logic_vector(0 to 127);
iv : in std_logic_vector(0 to 127);
start : in boolean;
final : in boolean;
dataout : out std_logic_vector(0 to 127);
bytelen : in integer) is
begin
report "VHPIDIRECT cryptData" severity failure;
end procedure;
attribute foreign of cryptData: procedure is "VHPIDIRECT cryptData";
function swap (datain : std_logic_vector(0 to 127)) return std_logic_vector is
variable v_data : std_logic_vector(0 to 127);
begin
for i in 0 to 15 loop
for y in 0 to 7 loop
v_data((i*8)+y) := datain((i*8)+7-y);
end loop;
end loop;
return v_data;
end function;
begin
@ -80,43 +103,43 @@ begin
process is
variable v_start : std_logic;
variable v_key : std_logic_vector(0 to 127);
variable v_nonce : std_logic_vector(0 to C_NONCE_WIDTH-1);
variable v_datain : std_logic_vector(0 to 127);
variable v_dataout : std_logic_vector(0 to 127);
variable v_random : RandomPType;
begin
v_random.InitSeed(v_random'instance_name);
wait until s_reset = '1' and rising_edge(s_clk);
-- ENCRYPTION TESTs
report "Test encryption";
report "Test CTR-AES encryption";
for i in 0 to 31 loop
if (i = 0) then
s_start <= '1';
s_nonce <= v_random.RandSlv(s_nonce'length);
v_start := '1';
v_nonce := v_random.RandSlv(s_nonce'length);
else
s_start <= '0';
v_start := '0';
end if;
v_key := v_random.RandSlv(128);
v_datain := v_random.RandSlv(128);
s_key <= v_key;
s_validin <= '1';
s_key <= v_random.RandSlv(128);
s_datain <= v_random.RandSlv(128);
report "Test #" & to_string(i);
s_start <= v_start;
s_nonce <= v_nonce;
s_datain <= v_datain;
cryptData(swap(v_datain), swap(v_key), swap(v_nonce & 32x"0"), i = 0, i = 31, v_dataout, v_datain'length/8);
wait until s_acceptin = '1' and rising_edge(s_clk);
s_validin <= '0';
end loop;
-- Watchdog
wait for 1 us;
report "Watchdog error"
severity failure;
end process;
process is
begin
s_acceptout <= '0';
for i in 0 to 31 loop
wait until s_validout = '1' and rising_edge(s_clk);
wait until s_validout = '1' and rising_edge(s_clk);
s_acceptout <= '1';
assert s_dataout = swap(v_dataout)
report "Encryption error: Expected 0x" & to_hstring(swap(v_dataout)) & ", got 0x" & to_hstring(s_dataout)
severity failure;
wait until rising_edge(s_clk);
s_acceptout <= '0';
end loop;
report "Tests finished";
-- Watchdog
wait for 100 ns;
finish(0);
end process;


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