Commit 6ea3dfe1 authored by Jarkko Sakkinen's avatar Jarkko Sakkinen
Browse files

selftests: add TPM 2.0 tests 

Added the tests that I've been using for testing TPM 2.0 functionality
for a long time but have been out-of-tree so far, residing in

https://github.com/jsakkine-intel/tpm2-scripts



Cc: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: default avatarJoey Pabalinas <joeypabalinas@gmail.com>
Reviewed-by: default avatarPetr Vorel <petr.vorel@gmail.com>
parent 8ab547a2

tools/testing/selftests/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ TARGETS += sysctl 
ifneq (1, $(quicktest))

TARGETS += timers

endif

TARGETS += tpm2

TARGETS += user

TARGETS += vm

TARGETS += x86

tools/testing/selftests/tpm2/Makefile

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+4 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)

include ../lib.mk



TEST_PROGS := test_smoke.sh test_space.sh

tools/testing/selftests/tpm2/test_smoke.sh

0 → 100755
+4 −0
Original line number Diff line number Diff line 
#!/bin/bash

# SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)



python -m unittest -v tpm2_tests.SmokeTest

tools/testing/selftests/tpm2/test_space.sh

0 → 100755
+4 −0
Original line number Diff line number Diff line 
#!/bin/bash

# SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)



python -m unittest -v tpm2_tests.SpaceTest

tools/testing/selftests/tpm2/tpm2.py

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+696 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)



import hashlib

import os

import socket

import struct

import sys

import unittest

from fcntl import ioctl





TPM2_ST_NO_SESSIONS = 0x8001

TPM2_ST_SESSIONS = 0x8002



TPM2_CC_FIRST = 0x01FF



TPM2_CC_CREATE_PRIMARY = 0x0131

TPM2_CC_DICTIONARY_ATTACK_LOCK_RESET = 0x0139

TPM2_CC_CREATE = 0x0153

TPM2_CC_LOAD = 0x0157

TPM2_CC_UNSEAL = 0x015E

TPM2_CC_FLUSH_CONTEXT = 0x0165

TPM2_CC_START_AUTH_SESSION = 0x0176

TPM2_CC_GET_CAPABILITY	= 0x017A

TPM2_CC_PCR_READ = 0x017E

TPM2_CC_POLICY_PCR = 0x017F

TPM2_CC_PCR_EXTEND = 0x0182

TPM2_CC_POLICY_PASSWORD = 0x018C

TPM2_CC_POLICY_GET_DIGEST = 0x0189



TPM2_SE_POLICY = 0x01

TPM2_SE_TRIAL = 0x03



TPM2_ALG_RSA = 0x0001

TPM2_ALG_SHA1 = 0x0004

TPM2_ALG_AES = 0x0006

TPM2_ALG_KEYEDHASH = 0x0008

TPM2_ALG_SHA256 = 0x000B

TPM2_ALG_NULL = 0x0010

TPM2_ALG_CBC = 0x0042

TPM2_ALG_CFB = 0x0043



TPM2_RH_OWNER = 0x40000001

TPM2_RH_NULL = 0x40000007

TPM2_RH_LOCKOUT = 0x4000000A

TPM2_RS_PW = 0x40000009



TPM2_RC_SIZE            = 0x01D5

TPM2_RC_AUTH_FAIL       = 0x098E

TPM2_RC_POLICY_FAIL     = 0x099D

TPM2_RC_COMMAND_CODE    = 0x0143



TSS2_RC_LAYER_SHIFT = 16

TSS2_RESMGR_TPM_RC_LAYER = (11 << TSS2_RC_LAYER_SHIFT)



TPM2_CAP_HANDLES = 0x00000001

TPM2_CAP_COMMANDS = 0x00000002

TPM2_CAP_TPM_PROPERTIES = 0x00000006



TPM2_PT_FIXED = 0x100

TPM2_PT_TOTAL_COMMANDS = TPM2_PT_FIXED + 41



HR_SHIFT = 24

HR_LOADED_SESSION = 0x02000000

HR_TRANSIENT = 0x80000000



SHA1_DIGEST_SIZE = 20

SHA256_DIGEST_SIZE = 32



TPM2_VER0_ERRORS = {

    0x000: "TPM_RC_SUCCESS",

    0x030: "TPM_RC_BAD_TAG",

}



TPM2_VER1_ERRORS = {

    0x000: "TPM_RC_FAILURE",

    0x001: "TPM_RC_FAILURE",

    0x003: "TPM_RC_SEQUENCE",

    0x00B: "TPM_RC_PRIVATE",

    0x019: "TPM_RC_HMAC",

    0x020: "TPM_RC_DISABLED",

    0x021: "TPM_RC_EXCLUSIVE",

    0x024: "TPM_RC_AUTH_TYPE",

    0x025: "TPM_RC_AUTH_MISSING",

    0x026: "TPM_RC_POLICY",

    0x027: "TPM_RC_PCR",

    0x028: "TPM_RC_PCR_CHANGED",

    0x02D: "TPM_RC_UPGRADE",

    0x02E: "TPM_RC_TOO_MANY_CONTEXTS",

    0x02F: "TPM_RC_AUTH_UNAVAILABLE",

    0x030: "TPM_RC_REBOOT",

    0x031: "TPM_RC_UNBALANCED",

    0x042: "TPM_RC_COMMAND_SIZE",

    0x043: "TPM_RC_COMMAND_CODE",

    0x044: "TPM_RC_AUTHSIZE",

    0x045: "TPM_RC_AUTH_CONTEXT",

    0x046: "TPM_RC_NV_RANGE",

    0x047: "TPM_RC_NV_SIZE",

    0x048: "TPM_RC_NV_LOCKED",

    0x049: "TPM_RC_NV_AUTHORIZATION",

    0x04A: "TPM_RC_NV_UNINITIALIZED",

    0x04B: "TPM_RC_NV_SPACE",

    0x04C: "TPM_RC_NV_DEFINED",

    0x050: "TPM_RC_BAD_CONTEXT",

    0x051: "TPM_RC_CPHASH",

    0x052: "TPM_RC_PARENT",

    0x053: "TPM_RC_NEEDS_TEST",

    0x054: "TPM_RC_NO_RESULT",

    0x055: "TPM_RC_SENSITIVE",

    0x07F: "RC_MAX_FM0",

}



TPM2_FMT1_ERRORS = {

    0x001: "TPM_RC_ASYMMETRIC",

    0x002: "TPM_RC_ATTRIBUTES",

    0x003: "TPM_RC_HASH",

    0x004: "TPM_RC_VALUE",

    0x005: "TPM_RC_HIERARCHY",

    0x007: "TPM_RC_KEY_SIZE",

    0x008: "TPM_RC_MGF",

    0x009: "TPM_RC_MODE",

    0x00A: "TPM_RC_TYPE",

    0x00B: "TPM_RC_HANDLE",

    0x00C: "TPM_RC_KDF",

    0x00D: "TPM_RC_RANGE",

    0x00E: "TPM_RC_AUTH_FAIL",

    0x00F: "TPM_RC_NONCE",

    0x010: "TPM_RC_PP",

    0x012: "TPM_RC_SCHEME",

    0x015: "TPM_RC_SIZE",

    0x016: "TPM_RC_SYMMETRIC",

    0x017: "TPM_RC_TAG",

    0x018: "TPM_RC_SELECTOR",

    0x01A: "TPM_RC_INSUFFICIENT",

    0x01B: "TPM_RC_SIGNATURE",

    0x01C: "TPM_RC_KEY",

    0x01D: "TPM_RC_POLICY_FAIL",

    0x01F: "TPM_RC_INTEGRITY",

    0x020: "TPM_RC_TICKET",

    0x021: "TPM_RC_RESERVED_BITS",

    0x022: "TPM_RC_BAD_AUTH",

    0x023: "TPM_RC_EXPIRED",

    0x024: "TPM_RC_POLICY_CC",

    0x025: "TPM_RC_BINDING",

    0x026: "TPM_RC_CURVE",

    0x027: "TPM_RC_ECC_POINT",

}



TPM2_WARN_ERRORS = {

    0x001: "TPM_RC_CONTEXT_GAP",

    0x002: "TPM_RC_OBJECT_MEMORY",

    0x003: "TPM_RC_SESSION_MEMORY",

    0x004: "TPM_RC_MEMORY",

    0x005: "TPM_RC_SESSION_HANDLES",

    0x006: "TPM_RC_OBJECT_HANDLES",

    0x007: "TPM_RC_LOCALITY",

    0x008: "TPM_RC_YIELDED",

    0x009: "TPM_RC_CANCELED",

    0x00A: "TPM_RC_TESTING",

    0x010: "TPM_RC_REFERENCE_H0",

    0x011: "TPM_RC_REFERENCE_H1",

    0x012: "TPM_RC_REFERENCE_H2",

    0x013: "TPM_RC_REFERENCE_H3",

    0x014: "TPM_RC_REFERENCE_H4",

    0x015: "TPM_RC_REFERENCE_H5",

    0x016: "TPM_RC_REFERENCE_H6",

    0x018: "TPM_RC_REFERENCE_S0",

    0x019: "TPM_RC_REFERENCE_S1",

    0x01A: "TPM_RC_REFERENCE_S2",

    0x01B: "TPM_RC_REFERENCE_S3",

    0x01C: "TPM_RC_REFERENCE_S4",

    0x01D: "TPM_RC_REFERENCE_S5",

    0x01E: "TPM_RC_REFERENCE_S6",

    0x020: "TPM_RC_NV_RATE",

    0x021: "TPM_RC_LOCKOUT",

    0x022: "TPM_RC_RETRY",

    0x023: "TPM_RC_NV_UNAVAILABLE",

    0x7F: "TPM_RC_NOT_USED",

}



RC_VER1 = 0x100

RC_FMT1 = 0x080

RC_WARN = 0x900



ALG_DIGEST_SIZE_MAP = {

    TPM2_ALG_SHA1: SHA1_DIGEST_SIZE,

    TPM2_ALG_SHA256: SHA256_DIGEST_SIZE,

}



ALG_HASH_FUNCTION_MAP = {

    TPM2_ALG_SHA1: hashlib.sha1,

    TPM2_ALG_SHA256: hashlib.sha256

}



NAME_ALG_MAP = {

    "sha1": TPM2_ALG_SHA1,

    "sha256": TPM2_ALG_SHA256,

}





class UnknownAlgorithmIdError(Exception):

    def __init__(self, alg):

        self.alg = alg



    def __str__(self):

        return '0x%0x' % (alg)





class UnknownAlgorithmNameError(Exception):

    def __init__(self, name):

        self.name = name



    def __str__(self):

        return name





class UnknownPCRBankError(Exception):

    def __init__(self, alg):

        self.alg = alg



    def __str__(self):

        return '0x%0x' % (alg)





class ProtocolError(Exception):

    def __init__(self, cc, rc):

        self.cc = cc

        self.rc = rc



        if (rc & RC_FMT1) == RC_FMT1:

            self.name = TPM2_FMT1_ERRORS.get(rc & 0x3f, "TPM_RC_UNKNOWN")

        elif (rc & RC_WARN) == RC_WARN:

            self.name = TPM2_WARN_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")

        elif (rc & RC_VER1) == RC_VER1:

            self.name = TPM2_VER1_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")

        else:

            self.name = TPM2_VER0_ERRORS.get(rc & 0x7f, "TPM_RC_UNKNOWN")



    def __str__(self):

        if self.cc:

            return '%s: cc=0x%08x, rc=0x%08x' % (self.name, self.cc, self.rc)

        else:

            return '%s: rc=0x%08x' % (self.name, self.rc)





class AuthCommand(object):

    """TPMS_AUTH_COMMAND"""



    def __init__(self, session_handle=TPM2_RS_PW, nonce='', session_attributes=0,

                 hmac=''):

        self.session_handle = session_handle

        self.nonce = nonce

        self.session_attributes = session_attributes

        self.hmac = hmac



    def __str__(self):

        fmt = '>I H%us B H%us' % (len(self.nonce), len(self.hmac))

        return struct.pack(fmt, self.session_handle, len(self.nonce),

                           self.nonce, self.session_attributes, len(self.hmac),

                           self.hmac)



    def __len__(self):

        fmt = '>I H%us B H%us' % (len(self.nonce), len(self.hmac))

        return struct.calcsize(fmt)





class SensitiveCreate(object):

    """TPMS_SENSITIVE_CREATE"""



    def __init__(self, user_auth='', data=''):

        self.user_auth = user_auth

        self.data = data



    def __str__(self):

        fmt = '>H%us H%us' % (len(self.user_auth), len(self.data))

        return struct.pack(fmt, len(self.user_auth), self.user_auth,

                           len(self.data), self.data)



    def __len__(self):

        fmt = '>H%us H%us' % (len(self.user_auth), len(self.data))

        return struct.calcsize(fmt)





class Public(object):

    """TPMT_PUBLIC"""



    FIXED_TPM = (1 << 1)

    FIXED_PARENT = (1 << 4)

    SENSITIVE_DATA_ORIGIN = (1 << 5)

    USER_WITH_AUTH = (1 << 6)

    RESTRICTED = (1 << 16)

    DECRYPT = (1 << 17)



    def __fmt(self):

        return '>HHIH%us%usH%us' % \

            (len(self.auth_policy), len(self.parameters), len(self.unique))



    def __init__(self, object_type, name_alg, object_attributes, auth_policy='',

                 parameters='', unique=''):

        self.object_type = object_type

        self.name_alg = name_alg

        self.object_attributes = object_attributes

        self.auth_policy = auth_policy

        self.parameters = parameters

        self.unique = unique



    def __str__(self):

        return struct.pack(self.__fmt(),

                           self.object_type,

                           self.name_alg,

                           self.object_attributes,

                           len(self.auth_policy),

                           self.auth_policy,

                           self.parameters,

                           len(self.unique),

                           self.unique)



    def __len__(self):

        return struct.calcsize(self.__fmt())





def get_digest_size(alg):

    ds = ALG_DIGEST_SIZE_MAP.get(alg)

    if not ds:

        raise UnknownAlgorithmIdError(alg)

    return ds





def get_hash_function(alg):

    f = ALG_HASH_FUNCTION_MAP.get(alg)

    if not f:

        raise UnknownAlgorithmIdError(alg)

    return f





def get_algorithm(name):

    alg = NAME_ALG_MAP.get(name)

    if not alg:

        raise UnknownAlgorithmNameError(name)

    return alg





def hex_dump(d):

    d = [format(ord(x), '02x') for x in d]

    d = [d[i: i + 16] for i in xrange(0, len(d), 16)]

    d = [' '.join(x) for x in d]

    d = os.linesep.join(d)



    return d



class Client:

    FLAG_DEBUG = 0x01

    FLAG_SPACE = 0x02

    TPM_IOC_NEW_SPACE = 0xa200



    def __init__(self, flags = 0):

        self.flags = flags



        if (self.flags & Client.FLAG_SPACE) == 0:

            self.tpm = open('/dev/tpm0', 'r+b')

        else:

            self.tpm = open('/dev/tpmrm0', 'r+b')



    def close(self):

        self.tpm.close()



    def send_cmd(self, cmd):

        self.tpm.write(cmd)

        rsp = self.tpm.read()



        if (self.flags & Client.FLAG_DEBUG) != 0:

            sys.stderr.write('cmd' + os.linesep)

            sys.stderr.write(hex_dump(cmd) + os.linesep)

            sys.stderr.write('rsp' + os.linesep)

            sys.stderr.write(hex_dump(rsp) + os.linesep)



        rc = struct.unpack('>I', rsp[6:10])[0]

        if rc != 0:

            cc = struct.unpack('>I', cmd[6:10])[0]

            raise ProtocolError(cc, rc)



        return rsp



    def read_pcr(self, i, bank_alg = TPM2_ALG_SHA1):

        pcrsel_len = max((i >> 3) + 1, 3)

        pcrsel = [0] * pcrsel_len

        pcrsel[i >> 3] = 1 << (i & 7)

        pcrsel = ''.join(map(chr, pcrsel))



        fmt = '>HII IHB%us' % (pcrsel_len)

        cmd = struct.pack(fmt,

                          TPM2_ST_NO_SESSIONS,

                          struct.calcsize(fmt),

                          TPM2_CC_PCR_READ,

                          1,

                          bank_alg,

                          pcrsel_len, pcrsel)



        rsp = self.send_cmd(cmd)



        pcr_update_cnt, pcr_select_cnt = struct.unpack('>II', rsp[10:18])

        assert pcr_select_cnt == 1

        rsp = rsp[18:]



        alg2, pcrsel_len2 = struct.unpack('>HB', rsp[:3])

        assert bank_alg == alg2 and pcrsel_len == pcrsel_len2

        rsp = rsp[3 + pcrsel_len:]



        digest_cnt = struct.unpack('>I', rsp[:4])[0]

        if digest_cnt == 0:

            return None

        rsp = rsp[6:]



        return rsp



    def extend_pcr(self, i, dig, bank_alg = TPM2_ALG_SHA1):

        ds = get_digest_size(bank_alg)

        assert(ds == len(dig))



        auth_cmd = AuthCommand()



        fmt = '>HII I I%us IH%us' % (len(auth_cmd), ds)

        cmd = struct.pack(

            fmt,

            TPM2_ST_SESSIONS,

            struct.calcsize(fmt),

            TPM2_CC_PCR_EXTEND,

            i,

            len(auth_cmd),

            str(auth_cmd),

            1, bank_alg, dig)



        self.send_cmd(cmd)



    def start_auth_session(self, session_type, name_alg = TPM2_ALG_SHA1):

        fmt = '>HII IIH16sHBHH'

        cmd = struct.pack(fmt,

                          TPM2_ST_NO_SESSIONS,

                          struct.calcsize(fmt),

                          TPM2_CC_START_AUTH_SESSION,

                          TPM2_RH_NULL,

                          TPM2_RH_NULL,

                          16,

                          '\0' * 16,

                          0,

                          session_type,

                          TPM2_ALG_NULL,

                          name_alg)



        return struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]



    def __calc_pcr_digest(self, pcrs, bank_alg = TPM2_ALG_SHA1,

                          digest_alg = TPM2_ALG_SHA1):

        x = []

        f = get_hash_function(digest_alg)



        for i in pcrs:

            pcr = self.read_pcr(i, bank_alg)

            if pcr == None:

                return None

            x += pcr



        return f(bytearray(x)).digest()



    def policy_pcr(self, handle, pcrs, bank_alg = TPM2_ALG_SHA1,

                   name_alg = TPM2_ALG_SHA1):

        ds = get_digest_size(name_alg)

        dig = self.__calc_pcr_digest(pcrs, bank_alg, name_alg)

        if not dig:

            raise UnknownPCRBankError(bank_alg)



        pcrsel_len = max((max(pcrs) >> 3) + 1, 3)

        pcrsel = [0] * pcrsel_len

        for i in pcrs:

            pcrsel[i >> 3] |= 1 << (i & 7)

        pcrsel = ''.join(map(chr, pcrsel))



        fmt = '>HII IH%usIHB3s' % ds

        cmd = struct.pack(fmt,

                          TPM2_ST_NO_SESSIONS,

                          struct.calcsize(fmt),

                          TPM2_CC_POLICY_PCR,

                          handle,

                          len(dig), str(dig),

                          1,

                          bank_alg,

                          pcrsel_len, pcrsel)



        self.send_cmd(cmd)



    def policy_password(self, handle):

        fmt = '>HII I'

        cmd = struct.pack(fmt,

                          TPM2_ST_NO_SESSIONS,

                          struct.calcsize(fmt),

                          TPM2_CC_POLICY_PASSWORD,

                          handle)



        self.send_cmd(cmd)



    def get_policy_digest(self, handle):

        fmt = '>HII I'

        cmd = struct.pack(fmt,

                          TPM2_ST_NO_SESSIONS,

                          struct.calcsize(fmt),

                          TPM2_CC_POLICY_GET_DIGEST,

                          handle)



        return self.send_cmd(cmd)[12:]



    def flush_context(self, handle):

        fmt = '>HIII'

        cmd = struct.pack(fmt,

                          TPM2_ST_NO_SESSIONS,

                          struct.calcsize(fmt),

                          TPM2_CC_FLUSH_CONTEXT,

                          handle)



        self.send_cmd(cmd)



    def create_root_key(self, auth_value = ''):

        attributes = \

            Public.FIXED_TPM | \

            Public.FIXED_PARENT | \

            Public.SENSITIVE_DATA_ORIGIN | \

            Public.USER_WITH_AUTH | \

            Public.RESTRICTED | \

            Public.DECRYPT



        auth_cmd = AuthCommand()

        sensitive = SensitiveCreate(user_auth=auth_value)



        public_parms = struct.pack(

            '>HHHHHI',

            TPM2_ALG_AES,

            128,

            TPM2_ALG_CFB,

            TPM2_ALG_NULL,

            2048,

            0)



        public = Public(

            object_type=TPM2_ALG_RSA,

            name_alg=TPM2_ALG_SHA1,

            object_attributes=attributes,

            parameters=public_parms)



        fmt = '>HIII I%us H%us H%us HI' % \

            (len(auth_cmd), len(sensitive), len(public))

        cmd = struct.pack(

            fmt,

            TPM2_ST_SESSIONS,

            struct.calcsize(fmt),

            TPM2_CC_CREATE_PRIMARY,

            TPM2_RH_OWNER,

            len(auth_cmd),

            str(auth_cmd),

            len(sensitive),

            str(sensitive),

            len(public),

            str(public),

            0, 0)



        return struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]



    def seal(self, parent_key, data, auth_value, policy_dig,

             name_alg = TPM2_ALG_SHA1):

        ds = get_digest_size(name_alg)

        assert(not policy_dig or ds == len(policy_dig))



        attributes = 0

        if not policy_dig:

            attributes |= Public.USER_WITH_AUTH

            policy_dig = ''



        auth_cmd =  AuthCommand()

        sensitive = SensitiveCreate(user_auth=auth_value, data=data)



        public = Public(

            object_type=TPM2_ALG_KEYEDHASH,

            name_alg=name_alg,

            object_attributes=attributes,

            auth_policy=policy_dig,

            parameters=struct.pack('>H', TPM2_ALG_NULL))



        fmt = '>HIII I%us H%us H%us HI' % \

            (len(auth_cmd), len(sensitive), len(public))

        cmd = struct.pack(

            fmt,

            TPM2_ST_SESSIONS,

            struct.calcsize(fmt),

            TPM2_CC_CREATE,

            parent_key,

            len(auth_cmd),

            str(auth_cmd),

            len(sensitive),

            str(sensitive),

            len(public),

            str(public),

            0, 0)



        rsp = self.send_cmd(cmd)



        return rsp[14:]



    def unseal(self, parent_key, blob, auth_value, policy_handle):

        private_len = struct.unpack('>H', blob[0:2])[0]

        public_start = private_len + 2

        public_len = struct.unpack('>H', blob[public_start:public_start + 2])[0]

        blob = blob[:private_len + public_len + 4]



        auth_cmd = AuthCommand()



        fmt = '>HII I I%us %us' % (len(auth_cmd), len(blob))

        cmd = struct.pack(

            fmt,

            TPM2_ST_SESSIONS,

            struct.calcsize(fmt),

            TPM2_CC_LOAD,

            parent_key,

            len(auth_cmd),

            str(auth_cmd),

            blob)



        data_handle = struct.unpack('>I', self.send_cmd(cmd)[10:14])[0]



        if policy_handle:

            auth_cmd = AuthCommand(session_handle=policy_handle, hmac=auth_value)

        else:

            auth_cmd = AuthCommand(hmac=auth_value)



        fmt = '>HII I I%us' % (len(auth_cmd))

        cmd = struct.pack(

            fmt,

            TPM2_ST_SESSIONS,

            struct.calcsize(fmt),

            TPM2_CC_UNSEAL,

            data_handle,

            len(auth_cmd),

            str(auth_cmd))



        try:

            rsp = self.send_cmd(cmd)

        finally:

            self.flush_context(data_handle)



        data_len = struct.unpack('>I', rsp[10:14])[0] - 2



        return rsp[16:16 + data_len]



    def reset_da_lock(self):

        auth_cmd = AuthCommand()



        fmt = '>HII I I%us' % (len(auth_cmd))

        cmd = struct.pack(

            fmt,

            TPM2_ST_SESSIONS,

            struct.calcsize(fmt),

            TPM2_CC_DICTIONARY_ATTACK_LOCK_RESET,

            TPM2_RH_LOCKOUT,

            len(auth_cmd),

            str(auth_cmd))



        self.send_cmd(cmd)



    def __get_cap_cnt(self, cap, pt, cnt):

        handles = []

        fmt = '>HII III'



        cmd = struct.pack(fmt,

                          TPM2_ST_NO_SESSIONS,

                          struct.calcsize(fmt),

                          TPM2_CC_GET_CAPABILITY,

                          cap, pt, cnt)



        rsp = self.send_cmd(cmd)[10:]

        more_data, cap, cnt = struct.unpack('>BII', rsp[:9])

        rsp = rsp[9:]



        for i in xrange(0, cnt):

            handle = struct.unpack('>I', rsp[:4])[0]

            handles.append(handle)

            rsp = rsp[4:]



        return handles, more_data



    def get_cap(self, cap, pt):

        handles = []



        more_data = True

        while more_data:

            next_handles, more_data = self.__get_cap_cnt(cap, pt, 1)

            handles += next_handles

            pt += 1



        return handles

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