diff options
Diffstat (limited to 'test/tpm_test/trng_test.py')
| -rw-r--r-- | test/tpm_test/trng_test.py | 45 |
1 files changed, 24 insertions, 21 deletions
diff --git a/test/tpm_test/trng_test.py b/test/tpm_test/trng_test.py index aac2803076..ddfc659339 100644 --- a/test/tpm_test/trng_test.py +++ b/test/tpm_test/trng_test.py @@ -1,4 +1,4 @@ -#!/usr/bin/env python2 +# -*- 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. @@ -16,15 +16,18 @@ TRNG_SAMPLE_SIZE = 1000 # minimal recommended by NIST is 1000 bytes per sample TRNG_SAMPLE_COUNT = 1000 # NIST require at least 1000000 of 8-bit samples def get_random_command(size): - return struct.pack(TRNG_TEST_FMT, size) + """Encode get_random command""" + return struct.pack(TRNG_TEST_FMT, size) def get_random_command_rsp(size): - return struct.pack(TRNG_TEST_RSP_FMT, 0x8001, - struct.calcsize(TRNG_TEST_RSP_FMT) + size, 0, TRNG_TEST_CC) + """Create expected response to get_random""" + return struct.pack(TRNG_TEST_RSP_FMT, 0x8001, + struct.calcsize(TRNG_TEST_RSP_FMT) + size, + 0, TRNG_TEST_CC) def trng_test(tpm): - """Download entropy samples from TRNG + """Download entropy samples from TRNG Command structure, shared out of band with the test running on the target: @@ -32,19 +35,19 @@ def trng_test(tpm): =================================================================== text_len | 2 | size of the text to process, big endian - Args: - tpm: a tpm object used to communicate with the device - - Raises: - subcmd.TpmTestError: on unexpected target responses - """ - with open('/tmp/trng_output', 'wb') as f: - for x in range(0, TRNG_SAMPLE_COUNT): - wrapped_response = tpm.command(tpm.wrap_ext_command(TRNG_TEST_CC, - get_random_command(TRNG_SAMPLE_SIZE))) - if wrapped_response[:12] != get_random_command_rsp(TRNG_SAMPLE_SIZE): - raise subcmd.TpmTestError("Unexpected response to '%s': %s" % - ("trng", utils.hex_dump(wrapped_response))) - f.write(wrapped_response[12:]) - print('%s %d%%\r' %( utils.cursor_back(), (x/10)), end=""), - print('%sSUCCESS: %s' % (utils.cursor_back(), 'trng')) + Args: + tpm: a tpm object used to communicate with the device + + Raises: + subcmd.TpmTestError: on unexpected target responses + """ + with open('/tmp/trng_output', 'wb') as out_file: + for block in range(0, TRNG_SAMPLE_COUNT): + response = tpm.command(tpm.wrap_ext_command(TRNG_TEST_CC, + get_random_command(TRNG_SAMPLE_SIZE))) + if response[:12] != get_random_command_rsp(TRNG_SAMPLE_SIZE): + raise subcmd.TpmTestError("Unexpected response to \'%s\': %s" % + ('trng', utils.hex_dump(response))) + out_file.write(response[12:]) + print('%s %d%%\r' % (utils.cursor_back(), (block/10)), end='') + print('%sSUCCESS: %s' % (utils.cursor_back(), 'trng')) |