1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
|
#!/usr/bin/env python2
# Copyright 2016 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Module for testing ecc functions using extended commands."""
from binascii import a2b_hex as a2b
import hashlib
import os
import struct
import subcmd
import utils
_ECC_OPCODES = {
'SIGN': 0x00,
'VERIFY': 0x01,
'KEYGEN': 0x02,
'KEYDERIVE': 0x03,
'TEST_POINT': 0x04,
'VERIFY_ANY': 0x05,
'SIGN_ANY': 0x06,
}
_ECC_CURVES = {
'NIST-P256': 0x03,
}
# TPM2 signature codes.
_SIGN_MODE = {
'NONE': 0x00,
'ECDSA': 0x18,
# TODO(ngm): add support for SCHNORR.
# 'SCHNORR': 0x1c
}
# TPM2 ALG codes.
_HASH = {
'NONE': 0x00,
'SHA1': 0x04,
'SHA256': 0x0B
}
_HASH_FUNC = {
'NIST-P256': hashlib.sha256
}
NIST_P256_QX = ('12c3d6a2679ca8ee3c4d927f204ed5bc'
'b4577a04b0ac02b2a36ab3e9e10781de')
NIST_P256_QY = ('5c85ad7413971172fca5738fee9d0e7b'
'c59ffd8a626d689bc6cca4b58665521d')
PKEY = ('fc441e07744e48f109b7e66b29482f7b'
'7e3ec91fa27fd4870991b289fea0d20a')
##
# Field size:
# FIELD LENGTH
# OP 1
# CURVE_ID 1
# SIGN_MODE 1
# HASHING 1
# MSG_LEN 2 (big endian)
# MSG MSG_LEN
# R_LEN 2 (big endian)
# R R_LEN
# S_LEN 2 (big endian)
# S S_LEN
# DIGEST_LEN 2 (big endian)
# DIGEST DIGEST_LEN
# D_LEN 2 (big endian)
# D D_LEN
# QX_LEN 2 (big endian)
# QX QX_LEN
# QY_LEN 2 (big endian)
# QY QX_LEN
#
# Command formats:
#
# TEST_SIGN:
# OP | CURVE_ID | SIGN_MODE | HASHING | DIGEST_LEN | DIGEST
# @returns 0/1 | R_LEN | R | S_LEN | S
_TEST_SIGN = '{o:c}{c:c}{s:c}{h:c}{dl:s}{dig}'
# TEST_SIGN_ANY:
# OP | CURVE_ID | SIGN_MODE | HASHING | DIGEST_LEN | DIGEST | D_LEN | D
# @returns 0/1 | R_LEN | R | S_LEN | S
_TEST_SIGN_ANY = '{o:c}{c:c}{s:c}{h:c}{dl:s}{dig}{pl:s}{pk}'
#
# TEST_VERIFY:
# OP | CURVE_ID | SIGN_MODE | HASHING | R_LEN | R | S_LEN | S
# DIGEST_LEN | DIGEST
# @returns 1 if successful
_TEST_VERIFY = '{o:c}{c:c}{sm:c}{h:c}{rs}{dl:s}{dig}'
# TEST_VERIFY_ANY:
# OP | CURVE_ID | SIGN_MODE | HASHING | R_LEN | R | S_LEN | S |
# DIGEST_LEN | DIGEST | QX_LEN | QX | QY_LEN | QY
# @returns 1 if successful
_TEST_VERIFY_ANY = _TEST_VERIFY + '{qxl:s}{qx}{qyl:s}{qy}'
# TEST_KEYDERIVE:
# OP | CURVE_ID | SEED_LEN | SEED
# @returns 1 if successful
#
_TEST_KEYDERIVE = '{o:c}{c:c}{ml:s}{msg}'
# TEST_POINT:
# OP | CURVE_ID | QX_LEN | QX | QY_LEN | QY
# @returns 1 if point is on curve
_TEST_POINT = '{o:c}{c:c}{qxl:s}{qx}{qyl:s}{qy}'
#
# TEST_KEYGEN:
# OP | CURVE_ID
# @returns 0/1 | D_LEN | D | QX_LEN | QX | QY_LEN | QY
#
_TEST_KEYGEN = '{o:c}{c:c}'
def _sign_cmd(curve_id, hash_func, sign_mode, msg):
op = _ECC_OPCODES['SIGN']
digest = hash_func(msg).digest()
digest_len = len(digest)
return _TEST_SIGN.format(o=op, c=curve_id, s=sign_mode, h=_HASH['SHA256'],
dl=struct.pack('>H', digest_len), dig=digest)
def _sign_any_cmd(curve_id, hash_func, sign_mode, msg, pkey):
op = _ECC_OPCODES['SIGN_ANY']
digest = hash_func(msg).digest()
digest_len = len(digest)
return _TEST_SIGN_ANY.format(o=op, c=curve_id, s=sign_mode,
h=_HASH['SHA256'],
dl=struct.pack('>H', digest_len), dig=digest,
pl=struct.pack('>H', len(pkey)), pk=pkey)
def _verify_cmd(curve_id, hash_func, sign_mode, msg, sig):
op = _ECC_OPCODES['VERIFY']
digest = hash_func(msg).digest()
digest_len = len(digest)
return _TEST_VERIFY.format(o=op, c=curve_id, sm=sign_mode, h=_HASH['SHA256'],
rs=sig,
dl=struct.pack('>H', digest_len),
dig=digest)
def _verify_any_cmd(curve_id, hash_func, sign_mode, msg, sig, qx, qy):
op = _ECC_OPCODES['VERIFY_ANY']
digest = hash_func(msg).digest()
digest_len = len(digest)
return _TEST_VERIFY_ANY.format(o=op, c=curve_id, sm=sign_mode,
h=_HASH['SHA256'],
rs=sig,
dl=struct.pack('>H', digest_len), dig=digest,
qxl=struct.pack('>H', len(qx)), qx=qx,
qyl=struct.pack('>H', len(qy)), qy=qy)
def _test_point_cmd(curve_id, qx, qy):
op = _ECC_OPCODES['TEST_POINT']
return _TEST_POINT.format(o=op, c=curve_id,
qxl=struct.pack('>H', len(qx)), qx=qx,
qyl=struct.pack('>H', len(qy)), qy=qy)
def _keygen_cmd(curve_id):
op = _ECC_OPCODES['KEYGEN']
return _TEST_KEYGEN.format(o=op, c=curve_id)
def _keyderive_cmd(curve_id, seed):
op = _ECC_OPCODES['KEYDERIVE']
seed_len = len(seed)
return _TEST_KEYDERIVE.format(o=op, c=curve_id,
ml=struct.pack('>H', seed_len), msg=seed)
_SIGN_INPUTS = (
('NIST-P256', 'ECDSA'),
)
_KEYGEN_INPUTS = (
('NIST-P256',),
)
_KEYDERIVE_INPUTS = (
# Curve-id, random seed size.
('NIST-P256', 32),
)
def _sign_test(tpm):
msg = 'Hello CR50'
for data in _SIGN_INPUTS:
curve_id, sign_mode = data
test_name = 'ECC-SIGN:%s:%s' % data
cmd = _sign_cmd(_ECC_CURVES[curve_id], _HASH_FUNC[curve_id],
_SIGN_MODE[sign_mode], msg)
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.ECC, cmd))
expected = '\x01'
signature = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
if signature[:1] != expected:
raise subcmd.TpmTestError('%s error:%s:%s' % (
test_name, utils.hex_dump(signature[:1]), utils.hex_dump(expected)))
cmd = _verify_cmd(_ECC_CURVES[curve_id], _HASH_FUNC[curve_id],
_SIGN_MODE[sign_mode], msg, signature[1:])
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.ECC, cmd))
verified = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
if verified[:1] != expected:
raise subcmd.TpmTestError('%s error:%s:%s' % (
test_name, utils.hex_dump(verified[:1]), utils.hex_dump(expected)))
print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
def _sign_test_any(tpm):
msg = 'Hello CR50'
for data in _SIGN_INPUTS:
curve_id, sign_mode = data
test_name = 'ECC-SIGN, Q:%s:%s' % data
cmd = _sign_any_cmd(_ECC_CURVES[curve_id], _HASH_FUNC[curve_id],
_SIGN_MODE[sign_mode], msg, a2b(PKEY))
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.ECC, cmd))
expected = '\x01'
signature = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
if signature[:1] != expected:
raise subcmd.TpmTestError('%s error:%s:%s' % (
test_name, utils.hex_dump(signature[:1]), utils.hex_dump(expected)))
# make sure properly supplied Q.x, Q.y works
cmd = _verify_any_cmd(_ECC_CURVES[curve_id], _HASH_FUNC[curve_id],
_SIGN_MODE[sign_mode], msg, signature[1:],
a2b(NIST_P256_QX), a2b(NIST_P256_QY))
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.ECC, cmd))
verified = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
if verified[:1] != expected:
raise subcmd.TpmTestError('%s error:%s:%s' % (
test_name, utils.hex_dump(verified[:1]), utils.hex_dump(expected)))
print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
def _point_test(tpm):
test_name = 'POINT-TEST: NIST-P256'
cmd = _test_point_cmd(_ECC_CURVES['NIST-P256'],
a2b(NIST_P256_QX), a2b(NIST_P256_QY))
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.ECC, cmd))
verified = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
expected = '\x01'
if verified != expected:
raise subcmd.TpmTestError('%s error:%s:%s' % (
test_name, utils.hex_dump(verified), utils.hex_dump(expected)))
print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
def _keygen_test(tpm):
for data in _KEYGEN_INPUTS:
curve_id, = data
test_name = 'ECC-KEYGEN:%s' % data
cmd = _keygen_cmd(_ECC_CURVES[curve_id])
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.ECC, cmd))
valid = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
expected = '\x01'
if valid[:1] != expected:
raise subcmd.TpmTestError('%s error:%s:%s' % (
test_name, utils.hex_dump(valid[:1]), utils.hex_dump(expected)))
print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
def _keyderive_test(tpm):
for data in _KEYDERIVE_INPUTS:
curve_id, seed_bytes = data
seed = os.urandom(seed_bytes)
test_name = 'ECC-KEYDERIVE:%s' % data[0]
cmd = _keyderive_cmd(_ECC_CURVES[curve_id], seed)
wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.ECC, cmd))
valid = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
expected = '\x01'
if valid != expected:
raise subcmd.TpmTestError('%s error:%s:%s' % (
test_name, utils.hex_dump(valid), utils.hex_dump(expected)))
print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
def ecc_test(tpm):
_sign_test(tpm)
_sign_test_any(tpm)
_point_test(tpm)
_keygen_test(tpm)
_keyderive_test(tpm)
|
