1tpm2_checkquote(1) General Commands Manual tpm2_checkquote(1)
2
6 tpm2_checkquote(1) - Validates a quote provided by a TPM.
7
9 tpm2_checkquote [OPTIONS]
10
12 tpm2_checkquote(1) - Uses the public portion of the provided key to
13 validate a quote generated by a TPM. This will validate the signature
14 against the quote message and, if provided, verify that the qualifying
15 data and PCR values match those in the quote.
16
18 · -u, --public=FILE:
19 File input for the public portion of the signature verification key.
21 · -g, --hash-algorithm=ALGORITHM:
23 The hash algorithm used to digest the message.
25 · -m, --message=FILE:
27 The quote message that makes up the data that is signed by the TPM.
29 · -s, --signature=FILE:
31 The input signature file of the signature to be validated.
33 · -F, --format=FORMAT:
35 Signature format. The default is the TPM2.0 TPMT_SIGNATURE. Other
37 schemes are possible if the data came from an external source like
38 OpenSSL. The tool currently only supports rsassa.
39 · -f, --pcr=FILE:
41 Optional PCR input file to save the list of PCR values that were in‐
43 cluded in the quote.
44 · -q, --qualification=HEX_STRING:
46 Qualification data for the quote. This is typically used to add a
48 nonce against replay attacks.
49 References
52 Options that take algorithms support "nice-names".
53 There are two major algorithm specification string classes, simple and
55 complex. Only certain algorithms will be accepted by the TPM, based on
56 usage and conditions.
57 Simple specifiers
59 These are strings with no additional specification data. When creating
60 objects, non-specified portions of an object are assumed to defaults.
61 You can find the list of known "Simple Specifiers Below".
62 Asymmetric
64 · rsa
65 · ecc
67 Symmetric
69 · aes
70 · camellia
72 Hashing Algorithms
74 · sha1
75 · sha256
77 · sha384
79 · sha512
81 · sm3_256
83 · sha3_256
85 · sha3_384
87 · sha3_512
89 Keyed Hash
91 · hmac
92 · xor
94 Signing Schemes
96 · rsassa
97 · rsapss
99 · ecdsa
101 · ecdaa
103 · ecschnorr
105 Asymmetric Encryption Schemes
107 · oaep
108 · rsaes
110 · ecdh
112 Modes
114 · ctr
115 · ofb
117 · cbc
119 · cfb
121 · ecb
123 Misc
125 · null
126 Complex Specifiers
128 Objects, when specified for creation by the TPM, have numerous algo‐
129 rithms to populate in the public data. Things like type, scheme and
130 asymmetric details, key size, etc. Below is the general format for
131 specifying this data: <type>:<scheme>:<symmetric-details>
132 Type Specifiers
134 This portion of the complex algorithm specifier is required. The re‐
135 maining scheme and symmetric details will default based on the type
136 specified and the type of the object being created.
137 · aes - Default AES: aes128
139 · aes128<mode> - 128 bit AES with optional mode (ctr|ofb|cbc|cfb|ecb).
141 If mode is not specified, defaults to null.
142 · aes192<mode> - Same as aes128<mode>, except for a 192 bit key size.
144 · aes256<mode> - Same as aes128<mode>, except for a 256 bit key size.
146 · ecc - Elliptical Curve, defaults to ecc256.
148 · ecc192 - 192 bit ECC
150 · ecc224 - 224 bit ECC
152 · ecc256 - 256 bit ECC
154 · ecc384 - 384 bit ECC
156 · ecc521 - 521 bit ECC
158 · rsa - Default RSA: rsa2048
160 · rsa1024 - RSA with 1024 bit keysize.
162 · rsa2048 - RSA with 2048 bit keysize.
164 · rsa4096 - RSA with 4096 bit keysize.
166 Scheme Specifiers
168 Next, is an optional field, it can be skipped.
169 Schemes are usually Signing Schemes or Asymmetric Encryption Schemes.
171 Most signing schemes take a hash algorithm directly following the sign‐
172 ing scheme. If the hash algorithm is missing, it defaults to sha256.
173 Some take no arguments, and some take multiple arguments.
174 Hash Optional Scheme Specifiers
176 These scheme specifiers are followed by a dash and a valid hash algo‐
177 rithm, For example: oaep-sha256.
178 · oaep
180 · ecdh
182 · rsassa
184 · rsapss
186 · ecdsa
188 · ecschnorr
190 Multiple Option Scheme Specifiers
192 This scheme specifier is followed by a count (max size UINT16) then
193 folloed by a dash(-) and a valid hash algorithm. * ecdaa For example,
194 ecdaa4-sha256. If no count is specified, it defaults to 4.
195 No Option Scheme Specifiers
197 This scheme specifier takes NO arguments. * rsaes
198 Symmetric Details Specifiers
200 This field is optional, and defaults based on the type of object being
201 created and it's attributes. Generally, any valid Symmetric specifier
202 from the Type Specifiers list should work. If not specified, an asym‐
203 metric objects symmetric details defaults to aes128cfb.
204 Examples
206 Create an rsa2048 key with an rsaes asymmetric encryption scheme
207 tpm2_create -C parent.ctx -G rsa2048:rsaes -u key.pub -r key.priv
208 Create an ecc256 key with an ecdaa signing scheme with a count of 4
210 and sha384 hash
211 /tpm2_create -C parent.ctx -G ecc256:ec‐
213 daa4-sha384 -u key.pub -r key.priv cryptographic algorithms ALGORITHM.
214
216 Format selection for the signature output file. tss (the default) will
217 output a binary blob according to the TPM 2.0 specification and any po‐
218 tential compiler padding. The option plain will output the plain sig‐
219 nature data as defined by the used cryptographic algorithm. signature
220 FORMAT.
221
223 This collection of options are common to many programs and provide in‐
224 formation that many users may expect.
225 · -h, --help=[man|no-man]: Display the tools manpage. By default, it
227 attempts to invoke the manpager for the tool, however, on failure
228 will output a short tool summary. This is the same behavior if the
229 "man" option argument is specified, however if explicit "man" is re‐
230 quested, the tool will provide errors from man on stderr. If the
231 "no-man" option if specified, or the manpager fails, the short op‐
232 tions will be output to stdout.
233 To successfully use the manpages feature requires the manpages to be
235 installed or on MANPATH, See man(1) for more details.
236 · -v, --version: Display version information for this tool, supported
238 tctis and exit.
239 · -V, --verbose: Increase the information that the tool prints to the
241 console during its execution. When using this option the file and
242 line number are printed.
243 · -Q, --quiet: Silence normal tool output to stdout.
245 · -Z, --enable-errata: Enable the application of errata fixups. Useful
247 if an errata fixup needs to be applied to commands sent to the TPM.
248 Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent. in‐
249 formation many users may expect.
250
252 The TCTI or "Transmission Interface" is the communication mechanism
253 with the TPM. TCTIs can be changed for communication with TPMs across
254 different mediums.
255 To control the TCTI, the tools respect:
257 1. The command line option -T or --tcti
259 2. The environment variable: TPM2TOOLS_TCTI.
261 Note: The command line option always overrides the environment vari‐
263 able.
264 The current known TCTIs are:
266 · tabrmd - The resource manager, called tabrmd
268 (https://github.com/tpm2-software/tpm2-abrmd). Note that tabrmd and
269 abrmd as a tcti name are synonymous.
270 · mssim - Typically used for communicating to the TPM software simula‐
272 tor.
273 · device - Used when talking directly to a TPM device file.
275 · none - Do not initalize a connection with the TPM. Some tools allow
277 for off-tpm options and thus support not using a TCTI. Tools that do
278 not support it will error when attempted to be used without a TCTI
279 connection. Does not support ANY options and MUST BE presented as
280 the exact text of "none".
281 The arguments to either the command line option or the environment
283 variable are in the form:
284 <tcti-name>:<tcti-option-config>
286 Specifying an empty string for either the <tcti-name> or <tcti-op‐
288 tion-config> results in the default being used for that portion respec‐
289 tively.
290 TCTI Defaults
292 When a TCTI is not specified, the default TCTI is searched for using
293 dlopen(3) semantics. The tools will search for tabrmd, device and
294 mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query
295 what TCTI will be chosen as the default by using the -v option to print
296 the version information. The "default-tcti" key-value pair will indi‐
297 cate which of the aforementioned TCTIs is the default.
298 Custom TCTIs
300 Any TCTI that implements the dynamic TCTI interface can be loaded. The
301 tools internally use dlopen(3), and the raw tcti-name value is used for
302 the lookup. Thus, this could be a path to the shared library, or a li‐
303 brary name as understood by dlopen(3) semantics.
304
306 This collection of options are used to configure the various known TCTI
307 modules available:
308 · device: For the device TCTI, the TPM character device file for use by
310 the device TCTI can be specified. The default is /dev/tpm0.
311 Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI="de‐
313 vice:/dev/tpm0"
314 · mssim: For the mssim TCTI, the domain name or IP address and port
316 number used by the simulator can be specified. The default are
317 127.0.0.1 and 2321.
318 Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TC‐
320 TI="mssim:host=localhost,port=2321"
321 · abrmd: For the abrmd TCTI, the configuration string format is a se‐
323 ries of simple key value pairs separated by a ',' character. Each
324 key and value string are separated by a '=' character.
325 · TCTI abrmd supports two keys:
327 1. 'bus_name' : The name of the tabrmd service on the bus (a
329 string).
330 2. 'bus_type' : The type of the dbus instance (a string) limited to
332 'session' and 'system'.
333 Specify the tabrmd tcti name and a config string of bus_name=com.ex‐
335 ample.FooBar:
336 \--tcti=tabrmd:bus_name=com.example.FooBar
338 Specify the default (abrmd) tcti and a config string of bus_type=ses‐
340 sion:
341 \--tcti:bus_type=session
343 NOTE: abrmd and tabrmd are synonymous. the various known TCTI mod‐
345 ules.
346
348 Generate a quote with a TPM, then verify it
349 tpm2_createek -c 0x81010009 -G rsa -u ekpub.pem -f pem
350 tpm2_createak -C 0x81010009 -k 0x8101000a -G rsa -s rsassa -D sha256 \
352 -p akpub.pem -f pem -n ak.name
353 tpm2_quote -c 0x8101000a -l sha256:15,16,22 -q abc123 -m quote.out -s sig.out \
355 -o pcrs.out -g sha256
356 tpm2_checkquote -u akpub.pem -m quote.out -s sig.out -f pcrs.out -g sha256 \
358 -q abc123
359
361 Tools can return any of the following codes:
362 · 0 - Success.
364 · 1 - General non-specific error.
366 · 2 - Options handling error.
368 · 3 - Authentication error.
370 · 4 - TCTI related error.
372 · 5 - Non supported scheme. Applicable to tpm2_testparams.
374
376 Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
377
379 See the Mailing List (https://lists.01.org/mailman/listinfo/tpm2)
380tpm2-tools tpm2_checkquote(1)