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BRANCH=none TEST=tpmtest.py passes BUG=chrome-os-partner:43025,chrome-os-partner:47524 Signed-off-by: nagendra modadugu <ngm@google.com> Change-Id: I48f426176f17c57c723104d19c963b228f16d985 Reviewed-on: https://chromium-review.googlesource.com/318915 Commit-Ready: Nagendra Modadugu <ngm@google.com> Tested-by: Nagendra Modadugu <ngm@google.com> Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
118 lines
3.8 KiB
Python
118 lines
3.8 KiB
Python
#!/usr/bin/python
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# Copyright 2015 The Chromium OS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Module for testing hash functions using extended commands."""
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from __future__ import print_function
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import hashlib
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import struct
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import subcmd
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import utils
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# Hash command modes
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CMD_START = 0
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CMD_CONT = 1
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CMD_FINISH = 2
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CMD_SINGLE = 3
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# Hash modes
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MODE_SHA1 = 0
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MODE_SHA256 = 1
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class HashError(Exception):
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pass
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# A standard empty response to HASH extended commands.
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EMPTY_RESPONSE = ''.join('%c' % x for x in (0x80, 0x01, 0x00, 0x00, 0x00, 0x0c,
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0xba, 0xcc, 0xd0, 0x0a, 0x00, 0x01))
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test_inputs = (
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# SHA mode cmd mode handle text
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(MODE_SHA1, 'single', 0, 'anything really will work here'),
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(MODE_SHA256, 'single', 0, 'some more text, this time for sha256'),
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(MODE_SHA256, 'start', 1, 'some more text, this time for sha256'),
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(MODE_SHA256, 'cont', 1, 'some more text, this time for sha256'),
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(MODE_SHA256, 'start', 2, 'this could be anything, we just need to'),
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(MODE_SHA1, 'start', 3, 'let\'s interleave a sha1 calculation'),
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(MODE_SHA256, 'cont', 2, 'fill up a second context with something'),
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(MODE_SHA256, 'cont', 1, 'let\'s feed some more into context 1'),
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(MODE_SHA256, 'finish', 1, 'some more text, this time for sha256'),
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(MODE_SHA1, 'cont', 3, 'with two active sha256 calculations'),
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(MODE_SHA1, 'finish', 3, 'this should be enough'),
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(MODE_SHA256, 'finish', 2, 'it does not really matter what'),
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)
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def hash_test(tpm):
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"""Exercise multiple hash threads simultaneously.
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Command structure, shared out of band with the test running on the target:
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field | size | note
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===================================================================
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hash_cmd | 1 | 0 - start, 1 - cont., 2 - finish, 4 - single
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hash_mode | 1 | 0 - sha1, 1 - sha256
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handle | 1 | session handle, ignored in 'single' mode
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text_len | 2 | size of the text to process, big endian
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text | text_len | text to hash
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Args:
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tpm: a tpm object used to communicate with the device
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Raises:
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HashError: on unexpected target responses
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"""
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contexts = {}
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function_map = {
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MODE_SHA1: ('sha1', hashlib.sha1),
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MODE_SHA256: ('sha256', hashlib.sha256)
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}
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cmd_map = {
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'start': CMD_START,
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'cont': CMD_CONT,
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'finish': CMD_FINISH,
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'single': CMD_SINGLE
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}
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for test in test_inputs:
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hash_mode, cmd_name, handle, text = test
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mode_name, hash_func = function_map[hash_mode]
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hash_cmd = cmd_map[cmd_name]
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test_name = '%s:%s:%d' % (mode_name, cmd_name, handle)
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cmd = '%c' % hash_cmd
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cmd += '%c' % hash_mode
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cmd += '%c' % handle # Ignored for single shots
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cmd += struct.pack('>H', len(text))
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cmd += text
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wrapped_response = tpm.command(tpm.wrap_ext_command(subcmd.HASH, cmd))
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if hash_cmd in (CMD_START, CMD_CONT):
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if hash_cmd == CMD_START:
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contexts[handle] = hash_func()
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h = contexts[handle]
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h.update(text)
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if wrapped_response != EMPTY_RESPONSE:
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raise HashError("Unexpected response to '%s': %s" %
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(test_name, utils.hex_dump(wrapped_response)))
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continue
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if hash_cmd == CMD_FINISH:
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h = contexts[handle]
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elif hash_cmd == CMD_SINGLE:
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h = hash_func()
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else:
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raise HashError('Unknown command %d' % hash_cmd)
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h.update(text)
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digest = h.digest()
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result = wrapped_response[12:]
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if result != h.digest():
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raise HashError('%s error:%s%s' % (test_name,
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utils.hex_dump(digest),
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utils.hex_dump(result)))
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print('%sSUCCESS: %s' % (utils.cursor_back(), test_name))
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