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#!/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."""
import binascii
import hashlib
import os
import struct
import subcmd
import utils
_ECC_OPCODES = {
'SIGN': 0x00,
'VERIFY': 0x01,
'KEYGEN': 0x02,
'KEYDERIVE': 0x03,
}
_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
}
# Command format.
#
# 0x00 OP
# 0x00 CURVE_ID
# 0x00 SIGN_MODE
# 0x00 HASHING
# 0x00 MSB IN LEN
# 0x00 LSB IN LEN
# .... IN
# 0x00 MSB DIGEST LEN
# 0x00 LSB DIGEST LEN
# .... DIGEST
#
_ECC_CMD_FORMAT = '{o:c}{c:c}{s:c}{h:c}{ml:s}{msg}{dl:s}{dig}'
def _sign_cmd(curve_id, hash_func, sign_mode, msg):
op = _ECC_OPCODES['SIGN']
digest = hash_func(msg).digest()
digest_len = len(digest)
return _ECC_CMD_FORMAT.format(o=op, c=curve_id, s=sign_mode, h=_HASH['NONE'],
ml=struct.pack('>H', 0), msg='',
dl=struct.pack('>H', digest_len), dig=digest)
def _verify_cmd(curve_id, hash_func, sign_mode, msg, sig):
op = _ECC_OPCODES['VERIFY']
sig_len = len(sig)
digest = hash_func(msg).digest()
digest_len = len(digest)
return _ECC_CMD_FORMAT.format(o=op, c=curve_id, s=sign_mode, h=_HASH['NONE'],
ml=struct.pack('>H', sig_len), msg=sig,
dl=struct.pack('>H', digest_len), dig=digest)
def _keygen_cmd(curve_id):
op = _ECC_OPCODES['KEYGEN']
return _ECC_CMD_FORMAT.format(o=op, c=curve_id, s=_SIGN_MODE['NONE'],
h=_HASH['NONE'], ml=struct.pack('>H', 0), msg='',
dl=struct.pack('>H', 0), dig='')
def _keyderive_cmd(curve_id, seed):
op = _ECC_OPCODES['KEYDERIVE']
seed_len = len(seed)
return _ECC_CMD_FORMAT.format(o=op, c=curve_id, s=_SIGN_MODE['NONE'],
h=_HASH['NONE'], ml=struct.pack('>H', seed_len),
msg=seed, dl=struct.pack('>H', 0), dig='')
_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))
signature = tpm.unwrap_ext_response(subcmd.ECC, wrapped_response)
cmd = _verify_cmd(_ECC_CURVES[curve_id], _HASH_FUNC[curve_id],
_SIGN_MODE[sign_mode], msg, signature)
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 != 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 _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)
_keygen_test(tpm)
_keyderive_test(tpm)
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