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pm3py/tests/test_sim_ndef.py
michael c1ab980036 refactor: remove all backward-compat shims from sim/ 
Deletes 24 shim files from sim/. All test imports now point directly
to canonical transponders/ and trace/ paths. sim/ contains only
infrastructure (15 files): frame, memory, transponder ABC, reader ABC,
medium, sim_session, table_compiler, replay, relay, fuzzer, pm3medium,
mcu_bridge, mcu_protocol, dual_session, __init__.

751 tests passing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-18 20:56:40 -07:00

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"""Tests for NDEF Type 2 and Type 4 tag models."""
import asyncio
import pytest
from pm3py.sim.frame import RFFrame
from pm3py.sim.medium import SoftwareMedium
from pm3py.transponders.hf.iso14443a.base import Reader14443A, _compute_bcc
from pm3py.transponders.hf.iso14443a.ndef import NfcType2Tag, NfcType4Tag
def run(coro):
return asyncio.get_event_loop().run_until_complete(coro)
# ---------------------------------------------------------------------------
# NFC Type 2 Tag (extends Tag14443A_3)
# ---------------------------------------------------------------------------
class TestNfcType2Tag:
def test_atqa_sak(self):
tag = NfcType2Tag(uid=b"\x04\x01\x02\x03\x04\x05\x06", ndef_message=b"")
run(tag.power_on())
resp = run(tag.handle_frame(RFFrame.from_hex("26")))
assert resp.data == b"\x44\x00" # NTAG ATQA
# SELECT (7-byte UID needs cascade)
uid = b"\x04\x01\x02\x03\x04\x05\x06"
ct_uid = b"\x88" + uid[0:3]
bcc1 = _compute_bcc(ct_uid)
run(tag.handle_frame(RFFrame.from_bytes(b"\x93\x70" + ct_uid + bytes([bcc1]))))
cl2_uid = uid[3:7]
bcc2 = _compute_bcc(cl2_uid)
resp = run(tag.handle_frame(RFFrame.from_bytes(b"\x95\x70" + cl2_uid + bytes([bcc2]))))
assert resp.data[0] & 0x20 == 0 # SAK bit 5 = 0 (no ISO-DEP)
def test_read_returns_4_pages(self):
"""READ command returns 16 bytes (4 pages of 4 bytes)."""
tag = NfcType2Tag(uid=b"\x04\x01\x02\x03\x04\x05\x06",
ndef_message=b"\xD1\x01\x04\x54\x02enHi")
run(tag.power_on())
self._select(tag)
# READ page 0
resp = run(tag.handle_frame(RFFrame.from_bytes(b"\x30\x00")))
assert resp is not None
assert len(resp.data) == 16 # 4 pages
def test_cc_block_at_page_3(self):
"""Page 3 is the capability container."""
tag = NfcType2Tag(uid=b"\x04\x01\x02\x03\x04\x05\x06",
ndef_message=b"\xD1\x01\x04\x54\x02enHi",
total_pages=45) # NTAG213-like
run(tag.power_on())
self._select(tag)
# READ page 3 (CC is in pages 3)
resp = run(tag.handle_frame(RFFrame.from_bytes(b"\x30\x03")))
cc = resp.data[0:4]
assert cc[0] == 0xE1 # NDEF magic
assert cc[1] == 0x10 # version 1.0
assert cc[2] > 0 # size (in 8-byte units)
assert cc[3] == 0x00 # read/write access
def test_ndef_data_in_pages_4_plus(self):
"""NDEF message stored starting at page 4 as TLV."""
msg = b"\xD1\x01\x04\x54\x02enHi"
tag = NfcType2Tag(uid=b"\x04\x01\x02\x03\x04\x05\x06", ndef_message=msg)
run(tag.power_on())
self._select(tag)
# READ page 4
resp = run(tag.handle_frame(RFFrame.from_bytes(b"\x30\x04")))
# TLV: type=0x03 (NDEF), length, message...
assert resp.data[0] == 0x03 # NDEF TLV type
assert resp.data[1] == len(msg)
def test_write_page(self):
"""WRITE command writes 4 bytes to a page."""
tag = NfcType2Tag(uid=b"\x04\x01\x02\x03\x04\x05\x06", ndef_message=b"")
run(tag.power_on())
self._select(tag)
# WRITE page 4
resp = run(tag.handle_frame(RFFrame.from_bytes(b"\xA2\x04\xDE\xAD\xBE\xEF")))
assert resp is not None # ACK
# Read back
resp = run(tag.handle_frame(RFFrame.from_bytes(b"\x30\x04")))
assert resp.data[0:4] == b"\xDE\xAD\xBE\xEF"
def _select(self, tag):
uid = tag._uid
run(tag.handle_frame(RFFrame.from_hex("26")))
ct_uid = b"\x88" + uid[0:3]
bcc1 = _compute_bcc(ct_uid)
run(tag.handle_frame(RFFrame.from_bytes(b"\x93\x70" + ct_uid + bytes([bcc1]))))
cl2_uid = uid[3:7]
bcc2 = _compute_bcc(cl2_uid)
run(tag.handle_frame(RFFrame.from_bytes(b"\x95\x70" + cl2_uid + bytes([bcc2]))))
# ---------------------------------------------------------------------------
# NFC Type 4 Tag (extends Tag14443A_4)
# ---------------------------------------------------------------------------
class TestNfcType4Tag:
def test_sak_indicates_isodep(self):
tag = NfcType4Tag(uid=b"\x04\x01\x02\x03", ndef_message=b"")
run(tag.power_on())
run(tag.handle_frame(RFFrame.from_hex("26")))
uid = b"\x04\x01\x02\x03"
bcc = _compute_bcc(uid)
resp = run(tag.handle_frame(RFFrame.from_bytes(b"\x93\x70" + uid + bytes([bcc]))))
assert resp.data[0] & 0x20 != 0 # SAK bit 5 = 1
def test_rats_returns_ats(self):
tag = NfcType4Tag(uid=b"\x04\x01\x02\x03", ndef_message=b"")
run(tag.power_on())
self._select_and_rats(tag)
assert tag.state == "PROTOCOL"
def test_select_ndef_application(self):
"""SELECT NDEF application by AID D2760000850101."""
tag = NfcType4Tag(uid=b"\x04\x01\x02\x03",
ndef_message=b"\xD1\x01\x04\x54\x02enHi")
run(tag.power_on())
self._select_and_rats(tag)
# SELECT AID via I-block
select_apdu = b"\x00\xA4\x04\x00\x07\xD2\x76\x00\x00\x85\x01\x01"
iblock = b"\x02" + select_apdu
resp = run(tag.handle_frame(RFFrame.from_bytes(iblock)))
assert resp is not None
# Should get 9000 (success)
assert resp.data[-2:] == b"\x90\x00" or resp.data[1:3] == b"\x90\x00"
def test_select_cc_file(self):
"""SELECT CC file (E103) then READ BINARY."""
tag = NfcType4Tag(uid=b"\x04\x01\x02\x03",
ndef_message=b"\xD1\x01\x04\x54\x02enHi")
run(tag.power_on())
self._select_and_rats(tag)
# Select NDEF app
self._send_apdu(tag, b"\x00\xA4\x04\x00\x07\xD2\x76\x00\x00\x85\x01\x01")
# Select CC file (E103)
resp = self._send_apdu(tag, b"\x00\xA4\x00\x0C\x02\xE1\x03")
assert resp is not None
# READ BINARY offset=0, length=15
resp = self._send_apdu(tag, b"\x00\xB0\x00\x00\x0F")
assert resp is not None
# CC file starts with CCLEN(2) + version + ...
payload = resp[:-2] # strip SW
assert len(payload) >= 7
def test_read_ndef_file(self):
"""SELECT NDEF file (E104) then READ BINARY to get NDEF message."""
msg = b"\xD1\x01\x04\x54\x02enHi"
tag = NfcType4Tag(uid=b"\x04\x01\x02\x03", ndef_message=msg)
run(tag.power_on())
self._select_and_rats(tag)
# Select NDEF app
self._send_apdu(tag, b"\x00\xA4\x04\x00\x07\xD2\x76\x00\x00\x85\x01\x01")
# Select NDEF file (E104)
self._send_apdu(tag, b"\x00\xA4\x00\x0C\x02\xE1\x04")
# READ BINARY — first 2 bytes are NDEF length
resp = self._send_apdu(tag, b"\x00\xB0\x00\x00\x20")
payload = resp[:-2]
nlen = (payload[0] << 8) | payload[1]
assert nlen == len(msg)
assert payload[2:2 + nlen] == msg
def _select_and_rats(self, tag):
run(tag.handle_frame(RFFrame.from_hex("26")))
uid = tag._uid[:4]
bcc = _compute_bcc(uid)
run(tag.handle_frame(RFFrame.from_bytes(b"\x93\x70" + uid + bytes([bcc]))))
run(tag.handle_frame(RFFrame.from_hex("E050")))
def _send_apdu(self, tag, apdu: bytes) -> bytes:
"""Send APDU via I-block, return response payload (including SW)."""
pcb = 0x02
resp = run(tag.handle_frame(RFFrame.from_bytes(bytes([pcb]) + apdu)))
if resp is None:
return b""
return resp.data[1:] # strip PCB
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