Hi everyone,
I am using a CW310 Bergen board with the default AES example running on the FPGA. The encryption results are correct, so the AES implementation seems to work properly.
However, the traces do not show distinguishable AES activity as I expected.
I am wondering if I am doing something wrong in the measurement setup.
Has anyone experienced something similar with the Bergen board and PicoScope 6000?
Thanks!
import sys
import os
current_dir = os.path.dirname(os.path.abspath(__file__))
parent_dir = os.path.dirname(current_dir)
sys.path.append(parent_dir)
from capture.newps600a import PS6000a
def pico_settings():
target_freq = 10E6
total_core_cycle = 2000
desired_sampling_free = 156e6 #Hz
desired_no_sample_per_Clk = desired_sampling_freq/target_freq
desired_sample_per_trace = total_core_cycle * desired_no_sample_per_Clk
desired_sampling_interval = 1/desired_sampling_freq #ns
desired_sampling_duration = desired_sample_per_trace * desired_sampling_interval*1.2
try:
RESOLUTION = "10"
CHANNEL = "A"
COUPLING = "AC"
CHAN_RANGE = 0.1
TRIGGER_CHAN = "B"
TRIGGER_RANGE = 1
TRIGGER_EDGE = 'Rising'
TRIGGER_THRESHOLD = 0.3
if (TRIGGER_CHAN == "TriggerAux"):
TRIGGER_THRESHOLD = 0 # V
picoscope = PS6000a(RESOLUTION)
picoscope.set_channel(CHANNEL, COUPLING, CHAN_RANGE)
picoscope.set_channel(TRIGGER_CHAN, COUPLING, TRIGGER_RANGE)
picoscope.set_trigger(TRIGGER_CHAN, threshold_V=TRIGGER_THRESHOLD, timeout_ms= 10000, direction=TRIGGER_EDGE)
SAMPLING_INTERVAL, NUM_SAMPLES, SAMPLING_FREQ = picoscope.set_no_smaple(desired_sampling_interval, desired_sampling_duration)
NO_SAMPLE_PER_CLK = SAMPLING_FREQ/target_freq
SAMPLING_DURATION = NUM_SAMPLES / SAMPLING_FREQ
print("Sampling Interval: ", SAMPLING_INTERVAL*1e9, "ns")
print("Sampling Frequency: ", SAMPLING_FREQ/1e6, "MHz")
print("Target Frequency: ", target_freq/1e6, "MHz")
print("Sample per Clk: ", NO_SAMPLE_PER_CLK)
print("Sampling Duration: ", SAMPLING_DURATION*1e3, "ms")
print("Total sample per trace:", NUM_SAMPLES)
print("=============================================")
except Exception as e:
print("Couldn't found Picoscope")
print("Error:", str(e))
return picoscope , NUM_SAMPLES
import os
import time
import numpy as np
import matplotlib.pyplot as plt
from Crypto.Cipher import AES
import chipwhisperer as cw
from tqdm import trange
from pico_settings import pico_settings
# --------------------------------------------------
# 1) CW310 + bitstream
# --------------------------------------------------
scope = None
bsfile = r"..\..\cw310_top.bit"
target = cw.target(scope, cw.capture.targets.CW310, bsfile=bsfile, force=True)
target.vccint_set(1.0)
# Clock setup
target.pll.pll_outenable_set(False, 0)
target.pll.pll_outenable_set(False, 1)
target.pll.pll_outenable_set(True, 2)
target.pll.pll_outfreq_set(2e6, 2)
target.pll.pll_outfreq_set(2e6, 1)
picoscope, NUM_SAMPLES = pico_settings()
ktp = cw.ktp.Basic()
ktp.fixed_key = True
ktp.fixedPlain = False
key = bytes.fromhex("00112233445566778899aabbccddeeff")
pt = bytes.fromhex("000102030405060708090a0b0c0d0e0f")
traces = []
textin = []
keys = []
N = 5 # Number of traces
cipher = AES.new(key, AES.MODE_ECB)
expected_ct = cipher.encrypt(pt)
key, text = ktp.next()
cipher = AES.new(bytes(key), AES.MODE_ECB)
for i in trange(N, desc='Capturing traces'):
key, text = ktp.next() # manual creation of a key, text pair can be substituted here
textin.append(text)
keys.append(key)
reversed_key = key[::-1]
reversed_text = text[::-1]
try:
picoscope.arm()
except:
pass
target.fpga_write(target.REG_CRYPT_KEY, reversed_key)
target.fpga_write(target.REG_CRYPT_TEXTIN, reversed_text)
time.sleep(0.01)
target.usb_trigger_toggle()
time.sleep(0.03)
trace_A = np.asarray(picoscope.read_trace("A")) # power
trace_B = np.asarray(picoscope.read_trace("B")) # trigger
print("Trace A len:", len(trace_A))
print("Trace B len:", len(trace_B))
for _ in range(50):
output2 = target.fpga_read(target.REG_CRYPT_CIPHEROUT, 16)
if output2 != [255] * 16:
break
time.sleep(0.001)
reversed_output2 = output2[::-1]
print("Received: ", list(reversed_output2))
print("Expected: ", list(cipher.encrypt(bytes(text))))
traces.append(trace_A)
plt.figure(figsize=(12, 6))
plt.subplot(2, 1, 1)
plt.plot(trace_A[0:1600], linewidth=0.8)
plt.title("Power Trace (Channel A)")
plt.xlabel("Sample")
plt.ylabel("Amplitude")
plt.grid(True)
plt.subplot(2, 1, 2)
plt.plot(trace_B[0:1600], linewidth=0.8, color='orange')
plt.title("Trigger Trace (Channel B)")
plt.xlabel("Sample")
plt.ylabel("Voltage")
plt.grid(True)
plt.tight_layout()
plt.show()
