Merge pull request #1 in CCSESS/eltt2 from dev to master

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README.txt

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+--------------------------------------------------------------------------------
+        Infineon Embedded Linux TPM Toolbox 2 (ELTT2) for TPM 2.0 v1.1
+                            Infineon Technologies AG
+
+All information in this document is Copyright (c) 2014, Infineon Technologies AG
+All rights reserved.
+--------------------------------------------------------------------------------
+
+Contents:
+
+1.   Welcome
+1.1  Prerequisites
+1.2  Contents of the package
+1.3  Getting Started
+
+2.   Usage of Embedded Linux TPM Toolbox 2 (ELTT2)
+2.1  Generic Usage
+2.2  Examples
+
+3.   If you have questions
+
+4.   Release Info
+
+5.   FAQ
+
+================================================================================
+
+
+
+1. Welcome
+
+    Welcome to Embedded Linux TPM Toolbox 2 (ELTT2).
+    ELTT2 is a single-file executable program intended for testing, performing
+    diagnosis and basic state changes of the Infineon Technologies TPM 2.0.
+
+
+1.1 Prerequisites
+
+    To build and run ELTT2 you need GCC and a Linux system capable of hosting a
+    TPM 2.0.
+
+    Tested PC Platforms (x86):
+      - Ubuntu (R) Linux 12.04 LTS - 64 bit (modified Kernel 3.15.4)
+        with Infineon TPM 2.0 SLB9665 Firmware 5.22
+
+    Tested Embedded Platforms (ARM):
+      - Android 6.0 "Marshmallow" - 64 bit (modified Kernel 3.18.0+) on HiKey
+        with Prototype Infineon I2C TPM 2.0 for Embedded Platforms
+
+    ELTT2 may run on many other little-endian hardware and software
+    configurations capable of running Linux and hosting a TPM 2.0, but this has
+    not been tested.
+
+    ELTT2 does not support machines with a big-endian CPU.
+
+
+1.2 Contents of Package
+
+    ELTT2 consists of the following files:
+    - eltt2.c
+      Contains all method implementations of ELTT2.
+    - eltt2.h
+      Contains all constant definitions, method and command byte declarations
+      for the operation of ELTT2.
+    - License.txt
+      Contains the license agreement for ELTT2.
+    - Makefile
+      Contains the command to compile ELTT2.
+    - README.txt
+      This file.
+
+
+1.3 Getting Started
+
+    In order to execute ELTT2, you need to compile it first:
+      1. Switch to the directory with the ELTT2 source code
+      2. Compile the source code by typing the following command:
+         make
+
+    Due to hardware (and thus TPM) access restrictions for normal users, ELTT2
+    requires root (aka superuser or administrator) privileges. They can be
+    obtained e.g. by using the 'sudo' command on Debian Linux derivates.
+
+
+2. Usage of ELTT2
+
+
+2.1 Generic Usage
+
+    ELTT2 is operated as follows:
+
+    Call: ./eltt2 <option(s)>
+
+    For example: ./eltt2 -g or ./eltt2 -gc
+
+    For getting an overview of the possible commands, run ./eltt2 -h
+
+    Some options require the TPM to be in a specific state. This state is shown
+    in brackets ("[]") behind each command line option in the list below:
+
+    [u]: started
+
+    To get the TPM into the required state, call ELTT2 with the corresponding
+    commands ("x" for a state means that whether this state is required or not
+    depends on the actual command or the command parameters sent eventually to
+    the TPM).
+
+
+    Command line options:                           Preconditions:
+
+    -a <data bytes>: Hash Sequence SHA-1            [u]
+
+    -A <data bytes>: Hash Sequence SHA-256          [u]
+
+    -b <command bytes>: Enter your own TPM command  [u]
+
+    -c: Read Clock                                  [u]
+
+    -d <shutdown type>: Shutdown                    [u]
+
+    -e: PCR Extend SHA-1 <PCR index> <PCR digest>   [u]
+
+    -E: PCR Extend SHA-256 <PCR index> <PCR digest> [u]
+
+    -g: Get fixed capability values                 [u]
+
+    -v: Get variable capability values              [u]
+
+    -G <data length>: Get Random                    [u]
+
+    -h: Help                                        [-]
+
+    -r <PCR index>: PCR Read SHA-1                  [u]
+
+    -R <PCR index>: PCR Read SHA-256                [u]
+
+    -s <data bytes>: Hash SHA-1                     [u]
+
+    -S <data bytes>: Hash SHA-256                   [u]
+
+    -t <test type>: Self Test                       [u]
+
+    -T: Get Test Result                             [u]
+
+    -u <startup type>: Startup                      [-]
+
+    -z <PCR index>: PCR Reset                       [u]
+
+
+    Additional information:
+
+    -a:
+    With the "-a" command you can hash given data with the SHA-1 hash algorithm.
+    This hash sequence sends 3 commands [start, update, complete] to the TPM and
+    allows to hash an arbitrary amount of data.
+    For example, use the following command to hash the byte sequence {0x41,
+    0x62, 0x43, 0x64}:
+    ./eltt2 -a 41624364
+
+    -A:
+    With the "-A" command you can hash given data with the SHA-256 hash
+    algorithm. This hash sequence sends 3 commands [start, update, complete] to
+    the TPM and allows to hash an arbitrary amount of data.
+    For example, use the following command to hash the byte sequence {0x41,
+    0x62, 0x43, 0x64}:
+    ./eltt2 -A 41624364
+
+    -b:
+    With the "-b" command you can enter your own TPM command bytes and read the
+    TPM response.
+    For example, use the following command to send a TPM2_Startup with startup
+    type CLEAR to the TPM:
+    ./eltt2 -b 80010000000C000001440000
+
+    -c:
+    With the "-c" command you can read the clock values of the TPM.
+
+    -d:
+    With the "-d" command you can issue a TPM shutdown. It has 2 options:
+    ./eltt2 -d
+    or
+    ./eltt2 -d clear    send a TPM2_Shutdown command with shutdown type CLEAR to
+                        the TPM.
+    ./eltt2 -d state    send a TPM2_Shutdown command with shutdown type STATE to
+                        the TPM.
+
+    -e:
+    With the "-e" command you can extend bytes in the selected PCR with SHA-1.
+    To do so, you have to enter the index of PCR in hexadecimal that you like to
+    extend and the digest you want to extend the selected PCR with. Note that
+    you can only extend PCRs with index 0 to 16 and PCR 23 and that the digest
+    must have a length of 20 bytes (will be padded with 0 if necessary).
+    The TPM then builds an SHA-1 hash over the PCR data in the selected PCR and
+    the digest you provided and writes the result back to the selected PCR.
+    For example, use the following command to extend PCR 23 (0x17) with the byte
+    sequence {0x41, 0x62, 0x43, 0x64, 0x00, ... (will be filled with 0x00)}:
+    ./eltt2 -e 17 41624364
+
+    -E:
+    With the "-E" command you can extend bytes in the selected PCR with SHA-256.
+    To do so, you have to enter the index of PCR in hexadecimal that you like to
+    extend and the digest you want to extend the selected PCR with. Note that
+    you can only extend PCRs with index 0 to 16 and PCR 23 and that the digest
+    must have a length of 32 bytes (will be padded with 0 if necessary).
+    The TPM then builds an SHA-256 hash over the PCR data in the selected PCR
+    and the digest you provided and writes the result back to the selected PCR.
+    For example, use the following command to extend PCR 23 (0x17) with the byte
+    sequence {0x41, 0x62, 0x43, 0x64, 0x00, ... (will be filled with 0x00)}:
+    ./eltt2 -E 17 41624364
+
+    -g:
+    With the "-g" command you can read the TPM's fixed properties.
+
+    -v:
+    With the "-v" command you can read the TPM's variable properties.
+
+    -G:
+    With the "-G" command you can get a given amount of random bytes. Note that
+    you can only request a maximum amount of 32 random bytes at once.
+    For example, use the following command to get 20 (0x14) random bytes:
+    ./eltt2 -G 14
+
+    -r:
+    With the "-r" command you can read data from a selected SHA-1 PCR.
+    For example, use the following command to read data from PCR 23 (0x17):
+    ./eltt2 -r 17
+
+    -R:
+    With the "-R" command you can read data from a selected SHA-256 PCR.
+    For example, use the following command to read data from PCR 23 (0x17):
+    ./eltt2 -R 17
+
+    -s:
+    With the "-s" command you can hash given data with the SHA-1 hash algorithm.
+    This command only allows a limited amount of data to be hashed (depending on
+    the TPM's maximum input buffer size).
+    For example, use the following command to hash the byte sequence {0x41,
+    0x62, 0x43, 0x64}:
+    ./eltt2 -s 41624364
+
+    -S:
+    With the "-S" command you can hash given data with the SHA-256 hash
+    algorithm. This command only allows a limited amount of data to be hashed
+    (depending on the TPM input buffer size).
+    For example, use the following command to hash the byte sequence {0x41,
+    0x62, 0x43, 0x64}:
+    ./eltt2 -S 41624364
+
+    -t:
+    With the "-t" command you can issue a TPM selftest. It has 3 options:
+    ./eltt2 -t
+    or
+    ./eltt2 -t not_full     Perform a partial TPM2_Selftest to test previously
+                            untested TPM capabilities.
+    ./eltt2 -t full         Perform a full TPM2_Selftest to test all TPM
+                            capabilities.
+    ./eltt2 -t incremental  Perform a test of selected algorithms.
+
+    -T:
+    With the "-T" command you can read the results of a previously run selftest.
+
+    -u:
+    With the "-u" command you can issue a TPM startup command. It has 2 options:
+    ./eltt2 -u
+    or
+    ./eltt2 -u clear    send a TPM2_Startup with startup type CLEAR to the TPM.
+    ./eltt2 -u state    send a TPM2_Startup with startup type STATE to the TPM.
+
+    -z:
+    With the "-z" command you can reset a selected PCR. Note that you can only
+    reset PCRs 16 and 23 and that the PCR is going to be reset in both banks
+	(SHA-1 and SHA-256).
+    For example, use the following command to reset PCR 23 (0x17):
+    ./eltt2 -z 17
+
+
+2.2 Examples:
+
+    In order to work with the TPM, perform the following steps:
+    - Send the TPM2_Startup command: ./eltt2 -u
+
+
+
+3. If you have questions
+
+    If you have any questions or problems, please read the section "FAQ and
+    Troubleshooting" in this document.
+    In case you still have questions, contact your local Infineon
+    Representative.
+    Further information is available at http://www.infineon.com/tpm.
+
+
+
+4. Release Info
+
+    This is version 1.1. This version is a general release.
+
+
+
+5. FAQ and Troubleshooting
+
+    If you encounter any error, please make sure that
+    - the TPM is properly connected.
+    - the TPM driver is loaded, i.e. check that "/dev/tpm0" exists. In case of
+      driver loading problems (e.g. shown by "Error opening device"), reboot
+      your system and try to load the driver again.
+    - ELTT2 has been started with root permissions. Please note that ELTT2 needs
+      root permissions for all commands.
+    - the TPM is started. (See section 2.2 in this document on how to do this.)
+    - Trousers do not run anymore. In some cases the Kernel starts Trousers by
+      booting.
+      Shut down Trousers by entering the following command:
+      sudo pkill tcsd
+
+    The following list shows the most common errors and their solution:
+
+    The ELTT2 response is "Error opening the device.":
+    - You need to load a TPM driver before you can work with ELTT2.
+    - You need to start ELTT2 with root permissions.
+
+    The ELTT2 responds with error code 0x100.
+    - You need to send the TPM2_Startup command, or you did send it twice. In
+      case you have not sent it yet, do so with "./eltt2 -u".
+
+    The TPM does not change any of the permanent flags shown by sending the "-g"
+    command , e.g. after a force clear.
+    - The TPM requires a reset in order to change any of the permanent flags.
+      Press the reset button or disconnect the TPM to do so.
+
+    The value of a PCR does not change after sending PCR extend or reset.
+    - With the application permissions you cannot modify every PCR. For more
+      details, please refer to the description for the different PCR commands
+      in this file.