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# -*- coding: utf-8 -*-
# Copyright 2019 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 hash functions using extended commands."""
from __future__ import print_function
from binascii import a2b_hex as a2b
import subcmd
import utils
# A standard empty response to DRBG extended commands.
EMPTY_DRBG_RESPONSE = bytes([0x80, 0x01,
0x00, 0x00, 0x00, 0x0c,
0x00, 0x00, 0x00, 0x00,
0x00, subcmd.DRBG_TEST])
DRBG_INIT = 0
DRBG_RESEED = 1
DRBG_GENERATE = 2
DRBG_GROUP_INIT = 3
TEST_INPUTS = (
(DRBG_GROUP_INIT, 32),
(DRBG_INIT,
('C40894D0C37712140924115BF8A3110C7258532365BB598F81B127A5E4CB8EB0',
'FBB1EDAF92D0C2699F5C0A7418D308B09AC679FFBB0D8918C8E62D35091DD2B9',
'2B18535D739F7E75AF4FF0C0C713DD4C9B0A6803D2E0DB2BDE3C4F3650ABF750')),
(DRBG_RESEED,
('4D58A621857706450338CCA8A1AF5CD2BD9305F3475CF1A8752518DD8E8267B6',
'0153A0A1D7487E2EE9915E2CAA8488F97239C67595F418D9503D0B11CC07044E', '')),
(DRBG_GENERATE,
('39AE66C2939D1D73EF21AE22988B04CC7E8EA2D790C75E1FC6ACC7FEEEF90F98',
'',
False)),
(DRBG_GENERATE,
('B8031829E07B09EEEADEBA149D0AC9F08B110197CD8BBDDC32744BCD66FCF3C4',
'A1307377F6B472661BC3C6D44C035FB20A13CCB04D6601B2425FC4DDA3B6D7DF',
True)),
(DRBG_INIT,
('3A2D261884010CCB4C2C4D7B323CCB7BD4515089BEB749C565A7492710922164',
'9E4D22471A4546F516099DD4D737967562D1BB77D774B67B7FE4ED893AE336CF',
'5837CAA74345CC2D316555EF820E9F3B0FD454D8C5B7BDE68E4A176D52EE7D1C')),
(DRBG_GENERATE,
('4D87985505D779F1AD98455E04199FE8F2FE8E550E6FEB1D26177A2C5B744B9F',
'',
False)),
(DRBG_GENERATE,
('85D011A3B36AC6B25A792F213A1C22C80BFD1C5B47BCA04CD0D9834BB466447B',
'B03863C42C9396B4936D83A551871A424C5A8EDBDC9D1E0E8E89710D58B5CA1E',
True)),
)
# DRBG_TEST command structure:
#
# field | size | note
# ==========================================================================
# mode | 1 | 0 - DRBG_INIT, 1 - DRBG_RESEED, 2 - DRBG_GENERATE
# p0_len | 2 | size of first input in bytes
# p0 | p0_len | entropy for INIT & SEED, input for GENERATE
# p1_len | 2 | size of second input in bytes (for INIT & RESEED)
# | | or size of expected output for GENERATE
# p1 | p1_len | nonce for INIT & SEED
# p2_len | 2 | size of third input in bytes for DRBG_INIT
# p2 | p2_len | personalization for INIT & SEED
#
# DRBG_INIT (entropy, nonce, perso)
# DRBG_RESEED (entropy, additional input 1, additional input 2)
# DRBG_INIT and DRBG_RESEED returns empty response
# (up to a maximum of 128 bytes)
# DRBG_INIT and DRBG_RESEED commands follow same format
def _drbg_init_cmd(drbg_op, entropy, nonce, perso):
return drbg_op.to_bytes(1, 'big') +\
len(entropy).to_bytes(2, 'big') + entropy +\
len(nonce).to_bytes(2, 'big') + nonce +\
len(perso).to_bytes(2, 'big') + perso
# DRBG_GENERATE (p0_len, p0 - additional input 1, p1_len - size of output)
# DRBG_GENERATE returns p1_len bytes of generated data
def _drbg_gen_cmd(inp, outlen):
return DRBG_GENERATE.to_bytes(1, 'big') +\
len(inp).to_bytes(2, 'big') + inp +\
outlen.to_bytes(2, 'big')
def drbg_init(tpm, drbg_params):
"""Run the drbg reseed command with the given drbg params.
Args:
tpm: a tpm object used to communicate with the device
drbg_params: a tuple (entropy string, nonce string, perso string)
Raises:
subcmd.TpmTestError: on unexpected target responses
"""
entropy, nonce, perso = drbg_params
cmd = _drbg_init_cmd(DRBG_INIT, a2b(entropy), a2b(nonce), a2b(perso))
response = tpm.command(tpm.wrap_ext_command(subcmd.DRBG_TEST, cmd))
if response != EMPTY_DRBG_RESPONSE:
raise subcmd.TpmTestError('Unexpected response to '
'DRBG_INIT: %s' %
(utils.hex_dump(response)))
def drbg_reseed(tpm, drbg_params):
"""Run the drbg reseed command with the given drbg params.
Args:
tpm: a tpm object used to communicate with the device
drbg_params: a tuple (entropy string, input1 string, input2 string)
Raises:
subcmd.TpmTestError: on unexpected target responses
"""
entropy, inp1, inp2 = drbg_params
cmd = _drbg_init_cmd(DRBG_RESEED, a2b(entropy), a2b(inp1), a2b(inp2))
response = tpm.command(tpm.wrap_ext_command(subcmd.DRBG_TEST, cmd))
if response != EMPTY_DRBG_RESPONSE:
raise subcmd.TpmTestError('Unexpected response to '
'DRBG_RESEED: %s' %
(utils.hex_dump(response)))
def drbg_generate(tpm, drbg_params, outlen):
"""Run the drbg reseed command with the given drbg params.
Args:
tpm: a tpm object used to communicate with the device
drbg_params: a tuple (entropy string, nonce string, perso string)
outlen: the response size for the generate command
Returns:
The response from the generate command if the params say to check the
result otherwise return ''
Raises:
subcmd.TpmTestError: on unexpected target responses
"""
result_str = ''
inp, expected, check_result = drbg_params
cmd = _drbg_gen_cmd(a2b(inp), outlen)
response = tpm.command(tpm.wrap_ext_command(subcmd.DRBG_TEST, cmd))
if check_result:
result = response[12:]
result_hexdump = utils.hex_dump(result)
if expected and a2b(expected) != result:
raise subcmd.TpmTestError('error:\nexpected %s'
'\nreceived %s' %
(utils.hex_dump(a2b(expected)),
result_hexdump))
result_str = ''.join(result_hexdump.split()).upper()
return result_str
def drbg_test_inputs(tpm, test_inputs):
"""Runs DRBG test case.
Args:
tpm: a tpm object used to communicate with the device
Returns:
a list of tuples with the generate responses (tgid, tcid, result_str)
Raises:
subcmd.TpmTestError: on unexpected target responses
"""
tcid = 0
tgid = 0
test_results = []
for test in test_inputs:
drbg_op, drbg_params = test
if drbg_op == DRBG_GROUP_INIT:
tgid += 1
outlen = drbg_params
elif drbg_op == DRBG_INIT:
drbg_init(tpm, drbg_params)
elif drbg_op == DRBG_RESEED:
drbg_reseed(tpm, drbg_params)
elif drbg_op == DRBG_GENERATE:
generate_response = drbg_generate(tpm, drbg_params, outlen)
# drbg_generate will return an empty string if the test case says
# to ignore the input. Only save responses the test cares about.
if generate_response:
tcid += 1
test_results.append((tgid, tcid, generate_response))
print('%sSUCCESS: %s' % (utils.cursor_back(), 'DRBG test'))
return test_results
def drbg_test(tpm):
"""Runs DRBG test cases.
Args:
tpm: a tpm object used to communicate with the device
Raises:
subcmd.TpmTestError: on unexpected target responses
"""
drbg_test_inputs(tpm, TEST_INPUTS)
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