1tpm2_createprimary(1) General Commands Manual tpm2_createprimary(1)
2
6 tpm2_createprimary(1) - Create a primary key.
7
9 tpm2_createprimary [OPTIONS]
10
12 tpm2_createprimary(1) - This command is used to create a primary object
13 under one of the hierarchies: Owner, Platform, Endorsement, NULL. The
14 command will create and load a Primary Object. The sensitive and pub‐
15 lic portions are not returned. A context file for the created object’s
16 handle is saved as a file for future interactions with the created pri‐
17 mary.
18
20 • -C, --hierarchy=OBJECT:
21 The hierarchy under which the object is created. This will also dic‐
22 tate which authorization secret (if any) must be supplied. Defaults
23 to TPM_RH_OWNER, when no value specified. Supported options are:
24 • o for TPM_RH_OWNER
26 • p for TPM_RH_PLATFORM
28 • e for TPM_RH_ENDORSEMENT
30 • n for TPM_RH_NULL
32 • <num> where a raw number can be used.
34 • -P, --hierarchy-auth=AUTH:
36 The authorization value for the hierarchy specified with -C.
38 • -p, --key-auth=AUTH:
40 The authorization value for the primary object created.
42 • -g, --hash-algorithm=ALGORITHM:
44 The hash algorithm to use for generating the objects name. Defaults
46 to sha256 if not specified.
47 • -G, --key-algorithm=ALGORITHM:
49 The algorithm type for the generated primary key. Defaults to
51 rsa2048:null:aes128cfb.
52 • -c, --key-context=FILE:
54 The file path to save the object context of the generated primary ob‐
56 ject.
57 • -L, --policy=FILE:
59 An optional file input that contains the policy digest for policy
61 based authorization of the object.
62 • -a, --attributes=ATTRIBUTES:
64 The object attributes, optional. Defaults to: TPMA_OBJECT_RESTRICT‐
66 ED|TPMA_OBJECT_DECRYPT|TPMA_OBJECT_FIXEDTPM| TPMA_OBJECT_FIXEDPAR‐
67 ENT|TPMA_OBJECT_SENSITIVEDATAORIGIN| TPMA_OBJECT_USERWITHAUTH
68 • -u, --unique-data=FILE OR STDIN:
70 An optional file input that contains the unique field of TPMT_PUBLIC
72 in little-endian format. Primary key creator may place information
73 that causes the primary key generation scheme internal to the TPM to
74 generate statistically unique values. The TPM v2.0 specification
75 calls this field unique and overloads it so that it contains one val‐
76 ue when the application provides this structure as input and another
77 value when the applications receives this structure as output (like
78 public portion of the rsa key).
79 If the data is specified as a file, the user is responsible for en‐
81 suring that this buffer is formatted per TPMU_PUBLIC_ID union.
82 The unique data can also be retrieved from stdin buffer by specifying
84 “-” as the –unique-data option value and the tool will parse the key
85 type and associate the input data with the unique data buffer associ‐
86 ated with the key type. NOTE:
87 1. The maximum allowed bytes is dependent on key type and the TPM im‐
89 plementation. Eg. While TSS allows a value upto 512 for
90 MAX_RSA_KEY_BYTES, however the ibmSwTPM implementation supports a
91 value upto 256 bytes.
92 2. The unique input data specified on stdin for ECC is split for
94 specifying the X coordinate and Y coordinate buffers.
95 • --creation-data=FILE:
97 An optional file output that saves the creation data for certifica‐
99 tion.
100 • --template-data=FILE:
102 An optional file output that saves the key template data (TPM2B_PUB‐
104 LIC) to be used in tpm2_policytemplate.
105 • -t, --creation-ticket=FILE:
107 An optional file output that saves the creation ticket for certifica‐
109 tion.
110 • -d, --creation-hash=FILE:
112 An optional file output that saves the creation hash for certifica‐
114 tion.
115 • -q, --outside-info=FILE_OR_HEX:
117 An optional file or hex string to add unique data to the creation da‐
119 ta. Note that it does not contribute in creating statistically
120 unique object.
121 • -l, --pcr-list=PCR:
123 The list of PCR banks and selected PCRs’ ids for each bank to be in‐
125 cluded in the creation data for certification.
126 • --cphash=FILE
128 File path to record the hash of the command parameters. This is com‐
130 monly termed as cpHash. NOTE: When this option is selected, The tool
131 will not actually execute the command, it simply returns a cpHash.
132 • -f, --format:
134 Format selection for the public key output file. `tss' (the default)
136 will output a binary blob according to the TPM 2.0 Specification.
137 `pem' will output an OpenSSL compatible PEM encoded public key.
138 `der' will output an OpenSSL compatible DER encoded public key.
139 `tpmt' will output a binary blob of the TPMT_PUBLIC struct referenced
140 by TPM 2.0 specs.
141 Public key format.
143 • -o, --output=FILE:
145 The output file path, recording the public portion of the object.
147 References
150 The type of a context object, whether it is a handle or file name, is
151 determined according to the following logic in-order:
152 • If the argument is a file path, then the file is loaded as a restored
154 TPM transient object.
155 • If the argument is a prefix match on one of:
157 • owner: the owner hierarchy
159 • platform: the platform hierarchy
161 • endorsement: the endorsement hierarchy
163 • lockout: the lockout control persistent object
165 • If the argument argument can be loaded as a number it will be treat
167 as a handle, e.g. 0x81010013 and used directly._OBJECT_.
168
170 Authorization for use of an object in TPM2.0 can come in 3 different
171 forms: 1. Password 2. HMAC 3. Sessions
172 NOTE: “Authorizations default to the EMPTY PASSWORD when not speci‐
174 fied”.
175 Passwords
177 Passwords are interpreted in the following forms below using prefix
178 identifiers.
179 Note: By default passwords are assumed to be in the string form when
181 they do not have a prefix.
182 String
184 A string password, specified by prefix “str:” or it’s absence (raw
185 string without prefix) is not interpreted, and is directly used for au‐
186 thorization.
187 Examples
189 foobar
190 str:foobar
191 Hex-string
193 A hex-string password, specified by prefix “hex:” is converted from a
194 hexidecimal form into a byte array form, thus allowing passwords with
195 non-printable and/or terminal un-friendly characters.
196 Example
198 hex:0x1122334455667788
199 File
201 A file based password, specified be prefix “file:” should be the path
202 of a file containing the password to be read by the tool or a “-” to
203 use stdin. Storing passwords in files prevents information leakage,
204 passwords passed as options can be read from the process list or common
205 shell history features.
206 Examples
208 # to use stdin and be prompted
209 file:-
210 # to use a file from a path
212 file:path/to/password/file
213 # to echo a password via stdin:
215 echo foobar | tpm2_tool -p file:-
216 # to use a bash here-string via stdin:
218 tpm2_tool -p file:- <<< foobar
220 Sessions
222 When using a policy session to authorize the use of an object, prefix
223 the option argument with the session keyword. Then indicate a path to
224 a session file that was created with tpm2_startauthsession(1). Option‐
225 ally, if the session requires an auth value to be sent with the session
226 handle (eg policy password), then append a + and a string as described
227 in the Passwords section.
228 Examples
230 To use a session context file called session.ctx.
231 session:session.ctx
233 To use a session context file called session.ctx AND send the authvalue
235 mypassword.
236 session:session.ctx+mypassword
238 To use a session context file called session.ctx AND send the HEX auth‐
240 value 0x11223344.
241 session:session.ctx+hex:11223344
243 PCR Authorizations
245 You can satisfy a PCR policy using the “pcr:” prefix and the PCR mini‐
246 language. The PCR minilanguage is as follows:
247 <pcr-spec>=<raw-pcr-file>
248 The PCR spec is documented in in the section “PCR bank specifiers”.
250 The raw-pcr-file is an optional argument that contains the output of
252 the raw PCR contents as returned by tpm2_pcrread(1).
253 PCR bank specifiers (pcr.md)
255 Examples
257 To satisfy a PCR policy of sha256 on banks 0, 1, 2 and 3 use a specifi‐
258 er of:
259 pcr:sha256:0,1,2,3
261 specifying AUTH.
263
265 Options that take algorithms support “nice-names”.
266 There are two major algorithm specification string classes, simple and
268 complex. Only certain algorithms will be accepted by the TPM, based on
269 usage and conditions.
270 Simple specifiers
272 These are strings with no additional specification data. When creating
273 objects, non-specified portions of an object are assumed to defaults.
274 You can find the list of known “Simple Specifiers Below”.
275 Asymmetric
277 • rsa
278 • ecc
280 Symmetric
282 • aes
283 • camellia
285 Hashing Algorithms
287 • sha1
288 • sha256
290 • sha384
292 • sha512
294 • sm3_256
296 • sha3_256
298 • sha3_384
300 • sha3_512
302 Keyed Hash
304 • hmac
305 • xor
307 Signing Schemes
309 • rsassa
310 • rsapss
312 • ecdsa
314 • ecdaa
316 • ecschnorr
318 Asymmetric Encryption Schemes
320 • oaep
321 • rsaes
323 • ecdh
325 Modes
327 • ctr
328 • ofb
330 • cbc
332 • cfb
334 • ecb
336 Misc
338 • null
339 Complex Specifiers
341 Objects, when specified for creation by the TPM, have numerous algo‐
342 rithms to populate in the public data. Things like type, scheme and
343 asymmetric details, key size, etc. Below is the general format for
344 specifying this data: <type>:<scheme>:<symmetric-details>
345 Type Specifiers
347 This portion of the complex algorithm specifier is required. The re‐
348 maining scheme and symmetric details will default based on the type
349 specified and the type of the object being created.
350 • aes - Default AES: aes128
352 • aes128<mode> - 128 bit AES with optional mode (ctr|ofb|cbc|cfb|ecb).
354 If mode is not specified, defaults to null.
355 • aes192<mode> - Same as aes128<mode>, except for a 192 bit key size.
357 • aes256<mode> - Same as aes128<mode>, except for a 256 bit key size.
359 • ecc - Elliptical Curve, defaults to ecc256.
361 • ecc192 - 192 bit ECC
363 • ecc224 - 224 bit ECC
365 • ecc256 - 256 bit ECC
367 • ecc384 - 384 bit ECC
369 • ecc521 - 521 bit ECC
371 • rsa - Default RSA: rsa2048
373 • rsa1024 - RSA with 1024 bit keysize.
375 • rsa2048 - RSA with 2048 bit keysize.
377 • rsa4096 - RSA with 4096 bit keysize.
379 Scheme Specifiers
381 Next, is an optional field, it can be skipped.
382 Schemes are usually Signing Schemes or Asymmetric Encryption Schemes.
384 Most signing schemes take a hash algorithm directly following the sign‐
385 ing scheme. If the hash algorithm is missing, it defaults to sha256.
386 Some take no arguments, and some take multiple arguments.
387 Hash Optional Scheme Specifiers
389 These scheme specifiers are followed by a dash and a valid hash algo‐
390 rithm, For example: oaep-sha256.
391 • oaep
393 • ecdh
395 • rsassa
397 • rsapss
399 • ecdsa
401 • ecschnorr
403 Multiple Option Scheme Specifiers
405 This scheme specifier is followed by a count (max size UINT16) then
406 followed by a dash(-) and a valid hash algorithm. * ecdaa For example,
407 ecdaa4-sha256. If no count is specified, it defaults to 4.
408 No Option Scheme Specifiers
410 This scheme specifier takes NO arguments. * rsaes
411 Symmetric Details Specifiers
413 This field is optional, and defaults based on the type of object being
414 created and it’s attributes. Generally, any valid Symmetric specifier
415 from the Type Specifiers list should work. If not specified, an asym‐
416 metric objects symmetric details defaults to aes128cfb.
417 Examples
419 Create an rsa2048 key with an rsaes asymmetric encryption scheme
420 tpm2_create -C parent.ctx -G rsa2048:rsaes -u key.pub -r key.priv
421 Create an ecc256 key with an ecdaa signing scheme with a count of 4 and
423 sha384 hash
424 /tpm2_create -C parent.ctx -G ecc256:ecdaa4-sha384 -u key.pub -r
425 key.priv cryptographic algorithms ALGORITHM.
426
428 Object Attributes are used to control various properties of created ob‐
429 jects. When specified as an option, either the raw bitfield mask or
430 “nice-names” may be used. The values can be found in Table 31 Part 2
431 of the TPM2.0 specification, which can be found here:
432 <https://trustedcomputinggroup.org/wp-content/uploads/TPM-
434 Rev-2.0-Part-2-Structures-01.38.pdf>
435 Nice names are calculated by taking the name field of table 31 and re‐
437 moving the prefix TPMA_OBJECT_ and lowercasing the result. Thus, TP‐
438 MA_OBJECT_FIXEDTPM becomes fixedtpm. Nice names can be joined using
439 the bitwise or “|” symbol.
440 For instance, to set The fields TPMA_OBJECT_FIXEDTPM, TPMA_OBJECT_NODA,
442 and TPMA_OBJECT_SIGN_ENCRYPT, the argument would be:
443 fixedtpm|noda|sign specifying the object attributes ATTRIBUTES.
445
447 This collection of options are common to many programs and provide in‐
448 formation that many users may expect.
449 • -h, --help=[man|no-man]: Display the tools manpage. By default, it
451 attempts to invoke the manpager for the tool, however, on failure
452 will output a short tool summary. This is the same behavior if the
453 “man” option argument is specified, however if explicit “man” is re‐
454 quested, the tool will provide errors from man on stderr. If the
455 “no-man” option if specified, or the manpager fails, the short op‐
456 tions will be output to stdout.
457 To successfully use the manpages feature requires the manpages to be
459 installed or on MANPATH, See man(1) for more details.
460 • -v, --version: Display version information for this tool, supported
462 tctis and exit.
463 • -V, --verbose: Increase the information that the tool prints to the
465 console during its execution. When using this option the file and
466 line number are printed.
467 • -Q, --quiet: Silence normal tool output to stdout.
469 • -Z, --enable-errata: Enable the application of errata fixups. Useful
471 if an errata fixup needs to be applied to commands sent to the TPM.
472 Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent. in‐
473 formation many users may expect.
474
476 The TCTI or “Transmission Interface” is the communication mechanism
477 with the TPM. TCTIs can be changed for communication with TPMs across
478 different mediums.
479 To control the TCTI, the tools respect:
481 1. The command line option -T or --tcti
483 2. The environment variable: TPM2TOOLS_TCTI.
485 Note: The command line option always overrides the environment vari‐
487 able.
488 The current known TCTIs are:
490 • tabrmd - The resource manager, called tabrmd
492 (https://github.com/tpm2-software/tpm2-abrmd). Note that tabrmd and
493 abrmd as a tcti name are synonymous.
494 • mssim - Typically used for communicating to the TPM software simula‐
496 tor.
497 • device - Used when talking directly to a TPM device file.
499 • none - Do not initalize a connection with the TPM. Some tools allow
501 for off-tpm options and thus support not using a TCTI. Tools that do
502 not support it will error when attempted to be used without a TCTI
503 connection. Does not support ANY options and MUST BE presented as
504 the exact text of “none”.
505 The arguments to either the command line option or the environment
507 variable are in the form:
508 <tcti-name>:<tcti-option-config>
510 Specifying an empty string for either the <tcti-name> or <tcti-op‐
512 tion-config> results in the default being used for that portion respec‐
513 tively.
514 TCTI Defaults
516 When a TCTI is not specified, the default TCTI is searched for using
517 dlopen(3) semantics. The tools will search for tabrmd, device and
518 mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query
519 what TCTI will be chosen as the default by using the -v option to print
520 the version information. The “default-tcti” key-value pair will indi‐
521 cate which of the aforementioned TCTIs is the default.
522 Custom TCTIs
524 Any TCTI that implements the dynamic TCTI interface can be loaded. The
525 tools internally use dlopen(3), and the raw tcti-name value is used for
526 the lookup. Thus, this could be a path to the shared library, or a li‐
527 brary name as understood by dlopen(3) semantics.
528
530 This collection of options are used to configure the various known TCTI
531 modules available:
532 • device: For the device TCTI, the TPM character device file for use by
534 the device TCTI can be specified. The default is /dev/tpm0.
535 Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI=“de‐
537 vice:/dev/tpm0”
538 • mssim: For the mssim TCTI, the domain name or IP address and port
540 number used by the simulator can be specified. The default are
541 127.0.0.1 and 2321.
542 Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TC‐
544 TI=“mssim:host=localhost,port=2321”
545 • abrmd: For the abrmd TCTI, the configuration string format is a se‐
547 ries of simple key value pairs separated by a `,' character. Each
548 key and value string are separated by a `=' character.
549 • TCTI abrmd supports two keys:
551 1. `bus_name' : The name of the tabrmd service on the bus (a
553 string).
554 2. `bus_type' : The type of the dbus instance (a string) limited to
556 `session' and `system'.
557 Specify the tabrmd tcti name and a config string of bus_name=com.ex‐
559 ample.FooBar:
560 \--tcti=tabrmd:bus_name=com.example.FooBar
562 Specify the default (abrmd) tcti and a config string of bus_type=ses‐
564 sion:
565 \--tcti:bus_type=session
567 NOTE: abrmd and tabrmd are synonymous. the various known TCTI mod‐
569 ules.
570
572 Create an ECC primary object
573 tpm2_createprimary -C o -g sha256 -G ecc -c context.out
574 Create a primary object that follows the guidance of TCG Provisioning guide
576 See : https://trustedcomputinggroup.org/wp-content/up‐
577 loads/TCG-TPM-v2.0-Provisioning-Guidance-Published-v1r1.pdf
578 Where unique.dat contains the binary-formatted data: 0x00 0x01 (0x00 *
580 256)
581 ```bash tpm2_createprimary -C o -G rsa2048:aes128cfb -g sha256 -c
583 prim.ctx
584 -a `restricted|decrypt|fixedtpm|fixedparent|sensitivedataorigin|user‐
585 withauth|
586 noda' -u unique.dat
587 Create a primary object and output the public key in pem format
589 tpm2_createprimary -c primary.ctx --format=pem --output=public.pem
590
592 Tools can return any of the following codes:
593 • 0 - Success.
595 • 1 - General non-specific error.
597 • 2 - Options handling error.
599 • 3 - Authentication error.
601 • 4 - TCTI related error.
603 • 5 - Non supported scheme. Applicable to tpm2_testparams.
605
607 Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
608
610 See the Mailing List (https://lists.01.org/mailman/listinfo/tpm2)
611tpm2-tools tpm2_createprimary(1)