tpm2_ecdhkeygen - Online Linux Manual PageSection : 1
Updated :
Source : tpm2−tools
Note : General Commands Manual
NAMEtpm2_ecdhkeygen(1) − Creates an ephemeral key and uses it to generate the shared secret value using the parameters from a ECC public key.
SYNOPSIStpm2_ecdhkeygen [OPTIONS]
DESCRIPTIONtpm2_ecdhkeygen(1) − Creates an ephemeral key and uses it to generate the shared secret value using the parameters from a ECC public key.
OPTIONS• −c, −−context=FILE: Context object pointing to ECC public key. Either a file or a handle number. See section ‟Context Object Format”. • −u, −−public=FILE: Output ECC point Q. • −o, −−output=FILE Specify file path to save the calculated ecdh secret or Z point. • −−cphash=FILE File path to record the hash of the command parameters. This is commonly termed as cpHash. NOTE: When this option is selected, The tool will not actually execute the command, it simply returns a cpHash.
References
Algorithm SpecifiersOptions that take algorithms support ‟nice−names”. There are two major algorithm specification string classes, simple and complex. Only certain algorithms will be accepted by the TPM, based on usage and conditions.
Simple specifiersThese are strings with no additional specification data. When creating objects, non−specified portions of an object are assumed to defaults. You can find the list of known ‟Simple Specifiers” below.
Asymmetric• rsa • ecc
Symmetric• aes • camellia • sm4
Hashing Algorithms• sha1 • sha256 • sha384 • sha512 • sm3_256 • sha3_256 • sha3_384 • sha3_512
Keyed Hash• hmac • xor
Signing Schemes• rsassa • rsapss • ecdsa • ecdaa • ecschnorr • sm2
Asymmetric Encryption Schemes• oaep • rsaes • ecdh
Modes• ctr • ofb • cbc • cfb • ecb
Misc• null
Complex SpecifiersObjects, when specified for creation by the TPM, have numerous algorithms to populate in the public data. Things like type, scheme and asymmetric details, key size, etc. Below is the general format for specifying this data: <type>:<scheme>:<symmetric−details>
Type SpecifiersThis portion of the complex algorithm specifier is required. The remaining scheme and symmetric details will default based on the type specified and the type of the object being created. • aes − Default AES: aes128 • aes128<mode> − 128 bit AES with optional mode (ctr|ofb|cbc|cfb|ecb). If mode is not specified, defaults to null. • aes192<mode> − Same as aes128<mode>, except for a 192 bit key size. • aes256<mode> − Same as aes128<mode>, except for a 256 bit key size. • sm4 − Default SM4: sm4128 • sm4128 or sm4_128 <mode> − 128 bit SM4 with optional mode (ctr|ofb|cbc|cfb|ecb). If mode is not specified, defaults to null. • ecc − Elliptical Curve, defaults to ecc256. • ecc192 or ecc_nist_p192 − 192 bit ECC NIST curve • ecc224 or ecc_nist_p224 − 224 bit ECC NIST curve • ecc256 or ecc_nist_p256 − 256 bit ECC NIST curve • ecc384 or ecc_nist_p384 − 384 bit ECC NIST curve • ecc521 or ecc_nist_p521 − 521 bit ECC NIST curve • ecc_sm2 or ecc_sm2_p256 − 256 bit SM2 curve • rsa − Default RSA: rsa2048 • rsa1024 − RSA with 1024 bit keysize. • rsa2048 − RSA with 2048 bit keysize. • rsa3072 − RSA with 3072 bit keysize. • rsa4096 − RSA with 4096 bit keysize.
Scheme SpecifiersNext, is an optional field, it can be skipped. Schemes are usually Signing Schemes or Asymmetric Encryption Schemes. Most signing schemes take a hash algorithm directly following the signing scheme. If the hash algorithm is missing, it defaults to sha256. Some take no arguments, and some take multiple arguments.
Hash Optional Scheme SpecifiersThese scheme specifiers are followed by a dash and a valid hash algorithm, For example: oaep−sha256. • oaep • ecdh • rsassa • rsapss • ecdsa • ecschnorr • sm2
Multiple Option Scheme SpecifiersThis scheme specifier is followed by a count (max size UINT16) then followed by a dash(−) and a valid hash algorithm. * ecdaa For example, ecdaa4−sha256. If no count is specified, it defaults to 4.
No Option Scheme SpecifiersThis scheme specifier takes NO arguments. * rsaes
Symmetric Details SpecifiersThis field is optional, and defaults based on the type of object being created and it’s attributes. Generally, any valid Symmetric specifier from the Type Specifiers list should work. If not specified, an asymmetric objects symmetric details defaults to aes128cfb.
Examples
Create an rsa2048 key with an rsaes asymmetric encryption schemetpm2_create −C parent.ctx −G rsa2048:rsaes −u key.pub −r key.priv
Create an ecc256 key with an ecdaa signing scheme with a count of 4 and sha384 hash/tpm2_create −C parent.ctx −G ecc256:ecdaa4−sha384 −u key.pub −r key.priv cryptographic algorithms ALGORITHM.
COMMON OPTIONSThis collection of options are common to many programs and provide information that many users may expect. • −h, −−help=[man|no−man]: Display the tools manpage. By default, it attempts to invoke the manpager for the tool, however, on failure will output a short tool summary. This is the same behavior if the ‟man” option argument is specified, however if explicit ‟man” is requested, the tool will provide errors from man on stderr. If the ‟no−man” option if specified, or the manpager fails, the short options will be output to stdout. To successfully use the manpages feature requires the manpages to be installed or on MANPATH, See man(1) for more details. • −v, −−version: Display version information for this tool, supported tctis and exit. • −V, −−verbose: Increase the information that the tool prints to the console during its execution. When using this option the file and line number are printed. • −Q, −−quiet: Silence normal tool output to stdout. • −Z, −−enable−errata: Enable the application of errata fixups. Useful if an errata fixup needs to be applied to commands sent to the TPM. Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent. information many users may expect.
TCTI ConfigurationThe TCTI or ‟Transmission Interface” is the communication mechanism with the TPM. TCTIs can be changed for communication with TPMs across different mediums. To control the TCTI, the tools respect: 1. The command line option −T or −−tcti 2. The environment variable: TPM2TOOLS_TCTI. Note: The command line option always overrides the environment variable. The current known TCTIs are: • tabrmd − The resource manager, called tabrmd (https://github.com/tpm2-software/tpm2-abrmd). Note that tabrmd and abrmd as a tcti name are synonymous. • mssim − Typically used for communicating to the TPM software simulator. • device − Used when talking directly to a TPM device file. • none − Do not initalize a connection with the TPM. Some tools allow for off−tpm options and thus support not using a TCTI. Tools that do not support it will error when attempted to be used without a TCTI connection. Does not support ANY options and MUST BE presented as the exact text of ‟none”. The arguments to either the command line option or the environment variable are in the form: <tcti−name>:<tcti−option−config> Specifying an empty string for either the <tcti−name> or <tcti−option−config> results in the default being used for that portion respectively.
TCTI DefaultsWhen a TCTI is not specified, the default TCTI is searched for using dlopen(3) semantics. The tools will search for tabrmd, device and mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query what TCTI will be chosen as the default by using the −v option to print the version information. The ‟default−tcti” key−value pair will indicate which of the aforementioned TCTIs is the default.
Custom TCTIsAny TCTI that implements the dynamic TCTI interface can be loaded. The tools internally use dlopen(3), and the raw tcti−name value is used for the lookup. Thus, this could be a path to the shared library, or a library name as understood by dlopen(3) semantics.
TCTI OPTIONSThis collection of options are used to configure the various known TCTI modules available: • device: For the device TCTI, the TPM character device file for use by the device TCTI can be specified. The default is /dev/tpm0. Example: −T device:/dev/tpm0 or export \f[BI]TPM2TOOLS_TCTI\f[B]=\[lq]device:/dev/tpm0\[rq]\f[R] • mssim: For the mssim TCTI, the domain name or IP address and port number used by the simulator can be specified. The default are 127.0.0.1 and 2321. Example: −T mssim:host=localhost,port=2321 or export \f[BI]TPM2TOOLS_TCTI\f[B]=\[lq]mssim:host=localhost,port=2321\[rq]\f[R] • abrmd: For the abrmd TCTI, the configuration string format is a series of simple key value pairs separated by a `,' character. Each key and value string are separated by a `=' character. • TCTI abrmd supports two keys: 1. `bus_name' : The name of the tabrmd service on the bus (a string). 2. `bus_type' : The type of the dbus instance (a string) limited to `session' and `system'. Specify the tabrmd tcti name and a config string of bus_name=com.example.FooBar: \−−tcti=tabrmd:bus_name=com.example.FooBar Specify the default (abrmd) tcti and a config string of bus_type=session: \−−tcti:bus_type=session NOTE: abrmd and tabrmd are synonymous. the various known TCTI modules.
EXAMPLES tpm2_createprimary −C o −c prim.ctx −Q tpm2_create −C prim.ctx −c key.ctx −u key.pub −r key.priv −G ecc256:ecdaa tpm2_ecdhkeygen −u ecdh.pub −o ecdh.priv −c key.ctx
ReturnsTools can return any of the following codes: • 0 − Success. • 1 − General non−specific error. • 2 − Options handling error. • 3 − Authentication error. • 4 − TCTI related error. • 5 − Non supported scheme. Applicable to tpm2_testparams.
BUGSGithub Issues (https://github.com/tpm2-software/tpm2-tools/issues)
HELPSee the Mailing List (https://lists.linuxfoundation.org/mailman/listinfo/tpm2) 0
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ERROR : Need New Coding :         (rof_escape_sequence|91|tpm2_ecdhkeygen.1|345|\f[BI]TPM2TOOLS_TCTI\f[B]=\[lq]device:/dev/tpm0\[rq]\f[R] |\f[BI]TPM2TOOLS_TCTI\f[B]=\[lq]device:/dev/tpm0\[rq]\f[R] )         (rof_escape_sequence|91|tpm2_ecdhkeygen.1|354|\f[BI]TPM2TOOLS_TCTI\f[B]=\[lq]mssim:host=localhost,port=2321\[rq]\f[R] |\f[BI]TPM2TOOLS_TCTI\f[B]=\[lq]mssim:host=localhost,port=2321\[rq]\f[R] )