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184 lines
5.6 KiB
184 lines
5.6 KiB
import logging
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import random
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import cocotb
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import pprint
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from Vai import VaiDriver, VaiReceiver, VaiMonitor
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from cocotb.clock import Clock
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from cocotb.queue import Queue
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from cocotb.triggers import FallingEdge, RisingEdge, Timer, ReadOnly
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from Crypto.Cipher import AES
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from Crypto.Util.number import long_to_bytes, getRandomNBitInteger
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import vsc
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# Reset coroutine
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async def reset_dut(reset_n, duration_ns):
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reset_n.value = 0
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await Timer(duration_ns, units="ns")
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reset_n.value = 1
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# Stimuli model class
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@vsc.randobj
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class constraints():
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def __init__(self):
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self.key = vsc.rand_bit_t(128)
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self.data = vsc.rand_bit_t(128)
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@vsc.constraint
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def c(self):
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self.data >= 0 and self.data <= 2**128-1
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vsc.dist(self.key, [
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vsc.weight(0, 25),
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vsc.weight((1,2**128-2), 50),
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vsc.weight((2**128-1), 25)])
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# Stimuli covergroup
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@vsc.covergroup
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class covergroup():
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def __init__(self):
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self.with_sample(
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mode = vsc.bit_t(1),
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key = vsc.bit_t(128)
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)
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self.enc = vsc.coverpoint(self.mode, bins=dict(
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enc = vsc.bin(0)))
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self.dec = vsc.coverpoint(self.mode, bins=dict(
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dec = vsc.bin(1)))
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self.key0 = vsc.coverpoint(self.key, bins=dict(
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key0 = vsc.bin(0)))
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self.keyF = vsc.coverpoint(self.key, bins=dict(
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keyF = vsc.bin(2**128-1)))
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self.encXkey0 = vsc.cross([self.enc, self.key0])
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self.encXkeyF = vsc.cross([self.enc, self.keyF])
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self.decXkey0 = vsc.cross([self.dec, self.key0])
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self.decXkeyF = vsc.cross([self.dec, self.keyF])
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async def cg_sample(cg, queue):
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while True:
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_data = await queue.get()
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cg.sample(_data[0].value, _data[1].value)
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@cocotb.test(skip=False)
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async def test_aes_enc(dut):
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""" Test AES encryption """
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clkedge = RisingEdge(dut.clk_i)
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# Connect reset
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reset = dut.reset_i
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_input = [dut.mode_i, dut.key_i, dut.data_i]
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_output = dut.data_o
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# DUT input side
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vai_driver = VaiDriver(dut.clk_i, _input, dut.valid_i, dut.accept_o)
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vai_in_queue = cocotb.queue.Queue()
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vai_in_monitor = VaiMonitor(dut.clk_i, _input, dut.valid_i, dut.accept_o, vai_in_queue)
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# DUT output side
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vai_receiver = VaiReceiver(dut.clk_i, dut.data_o, dut.valid_o, dut.accept_i)
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vai_out_monitor = VaiMonitor(dut.clk_i, _output, dut.valid_o, dut.accept_i)
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cr = constraints()
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cg = covergroup()
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cocotb.start_soon(cg_sample(cg, vai_in_queue))
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# Drive input defaults (setimmediatevalue to avoid x asserts)
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dut.mode_i.setimmediatevalue(0)
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dut.key_i.setimmediatevalue(0)
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dut.data_i.setimmediatevalue(0)
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dut.valid_i.setimmediatevalue(0)
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dut.accept_i.setimmediatevalue(0)
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clock = Clock(dut.clk_i, 10, units="ns") # Create a 10 ns period clock
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cocotb.start_soon(clock.start()) # Start the clock
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# Execution will block until reset_dut has completed
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dut._log.info("Hold reset")
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await reset_dut(reset, 100)
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dut._log.info("Released reset")
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# Test 10 AES calculations
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for i in range(10):
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# Get now random stimuli
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cr.randomize()
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_key = cr.key
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_data = cr.data
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await clkedge
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# Drive AES inputs
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await vai_driver.send([0, _key, _data])
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# Calc reference data
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_aes = AES.new(_key.to_bytes(16, 'big'), AES.MODE_ECB)
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_ref = _aes.encrypt(_data.to_bytes(16, 'big'))
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# Get DUT output data
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_rec = await vai_receiver.receive()
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# Equivalence check
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assert _rec.buff == _ref, \
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f"Encrypt error, got 0x{_rec.buff.hex()}, expected 0x{_ref.hex()}"
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@cocotb.test(skip=False)
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async def test_aes_dec(dut):
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""" Test AES decryption """
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clkedge = RisingEdge(dut.clk_i)
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# Connect reset
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reset = dut.reset_i
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_input = [dut.mode_i, dut.key_i, dut.data_i]
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_output = dut.data_o
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# DUT input side
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vai_driver = VaiDriver(dut.clk_i, _input, dut.valid_i, dut.accept_o)
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vai_in_queue = cocotb.queue.Queue()
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vai_in_monitor = VaiMonitor(dut.clk_i, _input, dut.valid_i, dut.accept_o, vai_in_queue)
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# DUT output side
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vai_receiver = VaiReceiver(dut.clk_i, dut.data_o, dut.valid_o, dut.accept_i)
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vai_out_monitor = VaiMonitor(dut.clk_i, _output, dut.valid_o, dut.accept_i)
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cr = constraints()
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cg = covergroup()
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cocotb.start_soon(cg_sample(cg, vai_in_queue))
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# Drive input defaults (setimmediatevalue to avoid x asserts)
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dut.mode_i.setimmediatevalue(0)
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dut.key_i.setimmediatevalue(0)
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dut.data_i.setimmediatevalue(0)
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dut.valid_i.setimmediatevalue(0)
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dut.accept_i.setimmediatevalue(0)
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clock = Clock(dut.clk_i, 10, units="ns") # Create a 10 ns period clock
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cocotb.start_soon(clock.start()) # Start the clock
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# Execution will block until reset_dut has completed
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await reset_dut(reset, 100)
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dut._log.info("Released reset")
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# Test 10 AES calculations
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for i in range(10):
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# Get now random stimuli
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cr.randomize()
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_key = cr.key
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_data = cr.data
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await clkedge
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# Drive AES inputs
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await vai_driver.send([1, _key, _data])
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# Calc reference data
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_aes = AES.new(_key.to_bytes(16, 'big'), AES.MODE_ECB)
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_ref = _aes.decrypt(_data.to_bytes(16, 'big'))
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# Get DUT output data
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_rec = await vai_receiver.receive()
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# Equivalence check
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assert _rec.buff == _ref, \
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f"Decrypt error, got 0x{_rec.buff.hex()}, expected 0x{_ref.hex()}"
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with open('results/tb_aes_fcover.txt', 'w', encoding='utf-8') as f:
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f.write(vsc.get_coverage_report())
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