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1# Copyright 2021-2022 Google LLC
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      https://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15# -----------------------------------------------------------------------------
16# Imports
17# -----------------------------------------------------------------------------
18
19import pytest
20
21from bumble import smp
22from bumble.crypto import EccKey, aes_cmac, ah, c1, f4, f5, f6, g2, h6, h7, s1
23from bumble.pairing import OobData, OobSharedData, LeRole
24from bumble.hci import Address
25from bumble.core import AdvertisingData
26
27
28# -----------------------------------------------------------------------------
29# pylint: disable=invalid-name
30# -----------------------------------------------------------------------------
31
32
33# -----------------------------------------------------------------------------
34def reversed_hex(hex_str: str) -> bytes:
35    return bytes.fromhex(hex_str)[::-1]
36
37
38# -----------------------------------------------------------------------------
39def test_ecc():
40    key = EccKey.generate()
41    x = key.x
42    y = key.y
43
44    assert len(x) == 32
45    assert len(y) == 32
46
47    # Test DH with test vectors from the spec
48    private_A = (
49        '3f49f6d4 a3c55f38 74c9b3e3 d2103f50 4aff607b eb40b799 5899b8a6 cd3c1abd'
50    )
51    private_B = (
52        '55188b3d 32f6bb9a 900afcfb eed4e72a 59cb9ac2 f19d7cfb 6b4fdd49 f47fc5fd'
53    )
54    public_A_x = (
55        '20b003d2 f297be2c 5e2c83a7 e9f9a5b9 eff49111 acf4fddb cc030148 0e359de6'
56    )
57    public_A_y = (
58        'dc809c49 652aeb6d 63329abf 5a52155c 766345c2 8fed3024 741c8ed0 1589d28b'
59    )
60    public_B_x = (
61        '1ea1f0f0 1faf1d96 09592284 f19e4c00 47b58afd 8615a69f 559077b2 2faaa190'
62    )
63    public_B_y = (
64        '4c55f33e 429dad37 7356703a 9ab85160 472d1130 e28e3676 5f89aff9 15b1214a'
65    )
66    dhkey = 'ec0234a3 57c8ad05 341010a6 0a397d9b 99796b13 b4f866f1 868d34f3 73bfa698'
67
68    key_a = EccKey.from_private_key_bytes(
69        bytes.fromhex(private_A), bytes.fromhex(public_A_x), bytes.fromhex(public_A_y)
70    )
71    shared_key = key_a.dh(bytes.fromhex(public_B_x), bytes.fromhex(public_B_y))
72    assert shared_key == bytes.fromhex(dhkey)
73
74    key_b = EccKey.from_private_key_bytes(
75        bytes.fromhex(private_B), bytes.fromhex(public_B_x), bytes.fromhex(public_B_y)
76    )
77    shared_key = key_b.dh(bytes.fromhex(public_A_x), bytes.fromhex(public_A_y))
78    assert shared_key == bytes.fromhex(dhkey)
79
80
81# -----------------------------------------------------------------------------
82def test_c1():
83    k = bytes(16)
84    r = reversed_hex('5783D52156AD6F0E6388274EC6702EE0')
85    pres = reversed_hex('05000800000302')
86    preq = reversed_hex('07071000000101')
87    iat = 1
88    ia = reversed_hex('A1A2A3A4A5A6')
89    rat = 0
90    ra = reversed_hex('B1B2B3B4B5B6')
91    result = c1(k, r, preq, pres, iat, rat, ia, ra)
92    assert result == reversed_hex('1e1e3fef878988ead2a74dc5bef13b86')
93
94
95# -----------------------------------------------------------------------------
96def test_s1():
97    k = bytes(16)
98    r1 = reversed_hex('000F0E0D0C0B0A091122334455667788')
99    r2 = reversed_hex('010203040506070899AABBCCDDEEFF00')
100    result = s1(k, r1, r2)
101    assert result == reversed_hex('9a1fe1f0e8b0f49b5b4216ae796da062')
102
103
104# -----------------------------------------------------------------------------
105def test_aes_cmac():
106    m = b''
107    k = bytes.fromhex('2b7e1516 28aed2a6 abf71588 09cf4f3c')
108    cmac = aes_cmac(m, k)
109    assert cmac == bytes.fromhex('bb1d6929 e9593728 7fa37d12 9b756746')
110
111    m = bytes.fromhex('6bc1bee2 2e409f96 e93d7e11 7393172a')
112    cmac = aes_cmac(m, k)
113    assert cmac == bytes.fromhex('070a16b4 6b4d4144 f79bdd9d d04a287c')
114
115    m = bytes.fromhex(
116        '6bc1bee2 2e409f96 e93d7e11 7393172a'
117        + 'ae2d8a57 1e03ac9c 9eb76fac 45af8e51'
118        + '30c81c46 a35ce411'
119    )
120    cmac = aes_cmac(m, k)
121    assert cmac == bytes.fromhex('dfa66747 de9ae630 30ca3261 1497c827')
122
123    m = bytes.fromhex(
124        '6bc1bee2 2e409f96 e93d7e11 7393172a'
125        + 'ae2d8a57 1e03ac9c 9eb76fac 45af8e51'
126        + '30c81c46 a35ce411 e5fbc119 1a0a52ef'
127        + 'f69f2445 df4f9b17 ad2b417b e66c3710'
128    )
129    cmac = aes_cmac(m, k)
130    assert cmac == bytes.fromhex('51f0bebf 7e3b9d92 fc497417 79363cfe')
131
132
133# -----------------------------------------------------------------------------
134def test_f4():
135    u = reversed_hex(
136        '20b003d2 f297be2c 5e2c83a7 e9f9a5b9 eff49111 acf4fddb cc030148 0e359de6'
137    )
138    v = reversed_hex(
139        '55188b3d 32f6bb9a 900afcfb eed4e72a 59cb9ac2 f19d7cfb 6b4fdd49 f47fc5fd'
140    )
141    x = reversed_hex('d5cb8454 d177733e ffffb2ec 712baeab')
142    z = b'\0'
143    value = f4(u, v, x, z)
144    assert value == reversed_hex('f2c916f1 07a9bd1c f1eda1be a974872d')
145
146
147# -----------------------------------------------------------------------------
148def test_f5():
149    w = reversed_hex(
150        'ec0234a3 57c8ad05 341010a6 0a397d9b 99796b13 b4f866f1 868d34f3 73bfa698'
151    )
152    n1 = reversed_hex('d5cb8454 d177733e ffffb2ec 712baeab')
153    n2 = reversed_hex('a6e8e7cc 25a75f6e 216583f7 ff3dc4cf')
154    a1 = reversed_hex('00561237 37bfce')
155    a2 = reversed_hex('00a71370 2dcfc1')
156    value = f5(w, n1, n2, a1, a2)
157    assert value[0] == reversed_hex('2965f176 a1084a02 fd3f6a20 ce636e20')
158    assert value[1] == reversed_hex('69867911 69d7cd23 980522b5 94750a38')
159
160
161# -----------------------------------------------------------------------------
162def test_f6():
163    n1 = reversed_hex('d5cb8454 d177733e ffffb2ec 712baeab')
164    n2 = reversed_hex('a6e8e7cc 25a75f6e 216583f7 ff3dc4cf')
165    mac_key = reversed_hex('2965f176 a1084a02 fd3f6a20 ce636e20')
166    r = reversed_hex('12a3343b b453bb54 08da42d2 0c2d0fc8')
167    io_cap = reversed_hex('010102')
168    a1 = reversed_hex('00561237 37bfce')
169    a2 = reversed_hex('00a71370 2dcfc1')
170    value = f6(mac_key, n1, n2, r, io_cap, a1, a2)
171    assert value == reversed_hex('e3c47398 9cd0e8c5 d26c0b09 da958f61')
172
173
174# -----------------------------------------------------------------------------
175def test_g2():
176    u = reversed_hex(
177        '20b003d2 f297be2c 5e2c83a7 e9f9a5b9 eff49111 acf4fddb cc030148 0e359de6'
178    )
179    v = reversed_hex(
180        '55188b3d 32f6bb9a 900afcfb eed4e72a 59cb9ac2 f19d7cfb 6b4fdd49 f47fc5fd'
181    )
182    x = reversed_hex('d5cb8454 d177733e ffffb2ec 712baeab')
183    y = reversed_hex('a6e8e7cc 25a75f6e 216583f7 ff3dc4cf')
184    value = g2(u, v, x, y)
185    assert value == 0x2F9ED5BA
186
187
188# -----------------------------------------------------------------------------
189def test_h6():
190    KEY = reversed_hex('ec0234a3 57c8ad05 341010a6 0a397d9b')
191    KEY_ID = bytes.fromhex('6c656272')
192    assert h6(KEY, KEY_ID) == reversed_hex('2d9ae102 e76dc91c e8d3a9e2 80b16399')
193
194
195# -----------------------------------------------------------------------------
196def test_h7():
197    KEY = reversed_hex('ec0234a3 57c8ad05 341010a6 0a397d9b')
198    SALT = bytes.fromhex('00000000 00000000 00000000 746D7031')
199    assert h7(SALT, KEY) == reversed_hex('fb173597 c6a3c0ec d2998c2a 75a57011')
200
201
202# -----------------------------------------------------------------------------
203def test_ah():
204    irk = reversed_hex('ec0234a3 57c8ad05 341010a6 0a397d9b')
205    prand = reversed_hex('708194')
206    value = ah(irk, prand)
207    expected = reversed_hex('0dfbaa')
208    assert value == expected
209
210
211# -----------------------------------------------------------------------------
212def test_oob_data():
213    oob_data = OobData(
214        address=Address("F0:F1:F2:F3:F4:F5"),
215        role=LeRole.BOTH_PERIPHERAL_PREFERRED,
216        shared_data=OobSharedData(c=b'12', r=b'34'),
217    )
218    oob_data_ad = oob_data.to_ad()
219    oob_data_bytes = bytes(oob_data_ad)
220    oob_data_ad_parsed = AdvertisingData.from_bytes(oob_data_bytes)
221    oob_data_parsed = OobData.from_ad(oob_data_ad_parsed)
222    assert oob_data_parsed.address == oob_data.address
223    assert oob_data_parsed.role == oob_data.role
224    assert oob_data_parsed.shared_data.c == oob_data.shared_data.c
225    assert oob_data_parsed.shared_data.r == oob_data.shared_data.r
226
227
228# -----------------------------------------------------------------------------
229@pytest.mark.parametrize(
230    'ct2, expected',
231    [
232        (False, 'bc1ca4ef 633fc1bd 0d8230af ee388fb0'),
233        (True, '287ad379 dca40253 0a39f1f4 3047b835'),
234    ],
235)
236def test_ltk_to_link_key(ct2: bool, expected: str):
237    LTK = reversed_hex('368df9bc e3264b58 bd066c33 334fbf64')
238    assert smp.Session.derive_link_key(LTK, ct2) == reversed_hex(expected)
239
240
241# -----------------------------------------------------------------------------
242@pytest.mark.parametrize(
243    'ct2, expected',
244    [
245        (False, 'a813fb72 f1a3dfa1 8a2c9a43 f10d0a30'),
246        (True, 'e85e09eb 5eccb3e2 69418a13 3211bc79'),
247    ],
248)
249def test_link_key_to_ltk(ct2: bool, expected: str):
250    LINK_KEY = reversed_hex('05040302 01000908 07060504 03020100')
251    assert smp.Session.derive_ltk(LINK_KEY, ct2) == reversed_hex(expected)
252
253
254# -----------------------------------------------------------------------------
255if __name__ == '__main__':
256    test_ecc()
257    test_c1()
258    test_s1()
259    test_aes_cmac()
260    test_f4()
261    test_f5()
262    test_f6()
263    test_g2()
264    test_h6()
265    test_h7()
266    test_ah()
267    test_oob_data()
268