| What: /sys/class/tpm/tpmX/device/ |
| Date: April 2005 |
| KernelVersion: 2.6.12 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The device/ directory under a specific TPM instance exposes |
| the properties of that TPM chip |
| |
| |
| What: /sys/class/tpm/tpmX/device/active |
| Date: April 2006 |
| KernelVersion: 2.6.17 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "active" property prints a '1' if the TPM chip is accepting |
| commands. An inactive TPM chip still contains all the state of |
| an active chip (Storage Root Key, NVRAM, etc), and can be |
| visible to the OS, but will only accept a restricted set of |
| commands. See the TPM Main Specification part 2, Structures, |
| section 17 for more information on which commands are |
| available. |
| |
| What: /sys/class/tpm/tpmX/device/cancel |
| Date: June 2005 |
| KernelVersion: 2.6.13 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "cancel" property allows you to cancel the currently |
| pending TPM command. Writing any value to cancel will call the |
| TPM vendor specific cancel operation. |
| |
| What: /sys/class/tpm/tpmX/device/caps |
| Date: April 2005 |
| KernelVersion: 2.6.12 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "caps" property contains TPM manufacturer and version info. |
| |
| Example output: |
| |
| Manufacturer: 0x53544d20 |
| TCG version: 1.2 |
| Firmware version: 8.16 |
| |
| Manufacturer is a hex dump of the 4 byte manufacturer info |
| space in a TPM. TCG version shows the TCG TPM spec level that |
| the chip supports. Firmware version is that of the chip and |
| is manufacturer specific. |
| |
| What: /sys/class/tpm/tpmX/device/durations |
| Date: March 2011 |
| KernelVersion: 3.1 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "durations" property shows the 3 vendor-specific values |
| used to wait for a short, medium and long TPM command. All |
| TPM commands are categorized as short, medium or long in |
| execution time, so that the driver doesn't have to wait |
| any longer than necessary before starting to poll for a |
| result. |
| |
| Example output: |
| |
| 3015000 4508000 180995000 [original] |
| |
| Here the short, medium and long durations are displayed in |
| usecs. "[original]" indicates that the values are displayed |
| unmodified from when they were queried from the chip. |
| Durations can be modified in the case where a buggy chip |
| reports them in msec instead of usec and they need to be |
| scaled to be displayed in usecs. In this case "[adjusted]" |
| will be displayed in place of "[original]". |
| |
| What: /sys/class/tpm/tpmX/device/enabled |
| Date: April 2006 |
| KernelVersion: 2.6.17 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "enabled" property prints a '1' if the TPM chip is enabled, |
| meaning that it should be visible to the OS. This property |
| may be visible but produce a '0' after some operation that |
| disables the TPM. |
| |
| What: /sys/class/tpm/tpmX/device/owned |
| Date: April 2006 |
| KernelVersion: 2.6.17 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "owned" property produces a '1' if the TPM_TakeOwnership |
| ordinal has been executed successfully in the chip. A '0' |
| indicates that ownership hasn't been taken. |
| |
| What: /sys/class/tpm/tpmX/device/pcrs |
| Date: April 2005 |
| KernelVersion: 2.6.12 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "pcrs" property will dump the current value of all Platform |
| Configuration Registers in the TPM. Note that since these |
| values may be constantly changing, the output is only valid |
| for a snapshot in time. |
| |
| Example output: |
| |
| PCR-00: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75 |
| PCR-01: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75 |
| PCR-02: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75 |
| PCR-03: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75 |
| PCR-04: 3A 3F 78 0F 11 A4 B4 99 69 FC AA 80 CD 6E 39 57 C3 3B 22 75 |
| ... |
| |
| The number of PCRs and hex bytes needed to represent a PCR |
| value will vary depending on TPM chip version. For TPM 1.1 and |
| 1.2 chips, PCRs represent SHA-1 hashes, which are 20 bytes |
| long. Use the "caps" property to determine TPM version. |
| |
| What: /sys/class/tpm/tpmX/device/pubek |
| Date: April 2005 |
| KernelVersion: 2.6.12 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "pubek" property will return the TPM's public endorsement |
| key if possible. If the TPM has had ownership established and |
| is version 1.2, the pubek will not be available without the |
| owner's authorization. Since the TPM driver doesn't store any |
| secrets, it can't authorize its own request for the pubek, |
| making it unaccessible. The public endorsement key is gener- |
| ated at TPM menufacture time and exists for the life of the |
| chip. |
| |
| Example output: |
| |
| Algorithm: 00 00 00 01 |
| Encscheme: 00 03 |
| Sigscheme: 00 01 |
| Parameters: 00 00 08 00 00 00 00 02 00 00 00 00 |
| Modulus length: 256 |
| Modulus: |
| B4 76 41 82 C9 20 2C 10 18 40 BC 8B E5 44 4C 6C |
| 3A B2 92 0C A4 9B 2A 83 EB 5C 12 85 04 48 A0 B6 |
| 1E E4 81 84 CE B2 F2 45 1C F0 85 99 61 02 4D EB |
| 86 C4 F7 F3 29 60 52 93 6B B2 E5 AB 8B A9 09 E3 |
| D7 0E 7D CA 41 BF 43 07 65 86 3C 8C 13 7A D0 8B |
| 82 5E 96 0B F8 1F 5F 34 06 DA A2 52 C1 A9 D5 26 |
| 0F F4 04 4B D9 3F 2D F2 AC 2F 74 64 1F 8B CD 3E |
| 1E 30 38 6C 70 63 69 AB E2 50 DF 49 05 2E E1 8D |
| 6F 78 44 DA 57 43 69 EE 76 6C 38 8A E9 8E A3 F0 |
| A7 1F 3C A8 D0 12 15 3E CA 0E BD FA 24 CD 33 C6 |
| 47 AE A4 18 83 8E 22 39 75 93 86 E6 FD 66 48 B6 |
| 10 AD 94 14 65 F9 6A 17 78 BD 16 53 84 30 BF 70 |
| E0 DC 65 FD 3C C6 B0 1E BF B9 C1 B5 6C EF B1 3A |
| F8 28 05 83 62 26 11 DC B4 6B 5A 97 FF 32 26 B6 |
| F7 02 71 CF 15 AE 16 DD D1 C1 8E A8 CF 9B 50 7B |
| C3 91 FF 44 1E CF 7C 39 FE 17 77 21 20 BD CE 9B |
| |
| Possible values: |
| |
| Algorithm: TPM_ALG_RSA (1) |
| Encscheme: TPM_ES_RSAESPKCSv15 (2) |
| TPM_ES_RSAESOAEP_SHA1_MGF1 (3) |
| Sigscheme: TPM_SS_NONE (1) |
| Parameters, a byte string of 3 u32 values: |
| Key Length (bits): 00 00 08 00 (2048) |
| Num primes: 00 00 00 02 (2) |
| Exponent Size: 00 00 00 00 (0 means the |
| default exp) |
| Modulus Length: 256 (bytes) |
| Modulus: The 256 byte Endorsement Key modulus |
| |
| What: /sys/class/tpm/tpmX/device/temp_deactivated |
| Date: April 2006 |
| KernelVersion: 2.6.17 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "temp_deactivated" property returns a '1' if the chip has |
| been temporarily dectivated, usually until the next power |
| cycle. Whether a warm boot (reboot) will clear a TPM chip |
| from a temp_deactivated state is platform specific. |
| |
| What: /sys/class/tpm/tpmX/device/timeouts |
| Date: March 2011 |
| KernelVersion: 3.1 |
| Contact: tpmdd-devel@lists.sf.net |
| Description: The "timeouts" property shows the 4 vendor-specific values |
| for the TPM's interface spec timeouts. The use of these |
| timeouts is defined by the TPM interface spec that the chip |
| conforms to. |
| |
| Example output: |
| |
| 750000 750000 750000 750000 [original] |
| |
| The four timeout values are shown in usecs, with a trailing |
| "[original]" or "[adjusted]" depending on whether the values |
| were scaled by the driver to be reported in usec from msecs. |
