NAME¶

tpm2_hmac - performs an HMAC on the supplied data using the indicated hash algorithm. The caller shall provide proper authorization for use of handle.

SYNOPSIS¶

tpm2_hmac[ COMMON OPTIONS ] [ TCTI OPTIONS ] [ --keyHandle|--keyContext|--pwdk|--halg|--infile|--outfile|--passwdInHex| ]

performs an HMAC on the supplied data using the indicated hash algorithm. The caller shall provide proper authorization for use of handle.

DESCRIPTION¶

tpm2_hmac performs an HMAC on the supplied data using the indicated hash algorithm. The caller shall provide proper authorization for use of handle.

OPTIONS¶

-k ,--keyHandle

handle for the symmetric signing key providing the HMAC key

-c ,--keyContext

filename of the key context used for the operation

-P ,--pwdk

the keyHandle's password, optional

-g ,--halg

algorithm for the hash being computed 0x0004 TPM_ALG_SHA1 0x000B TPM_ALG_SHA256 0x000C TPM_ALG_SHA384 0x000D TPM_ALG_SHA512 0x0012 TPM_ALG_SM3_256

-I ,--infile

file containning the data to be HMACed

-o ,--outfile

file record the HMAC result

-X ,--passwdInHex

passwords given by any options are hex format.

[COMMON OPTIONS ]

This collection of options are common to many programs and provide information that many users may expect.

-h, --help

Display a manual describing the tool and its usage.

-v, --version

Display version information for this tool.

-V, --verbose

Increase the information that the tool prints to the console during its execution.

[TCTI OPTIONS ]

This collection of options are used to configure the varous TCTI modules available.

-T, --tcti

Select the TCTI used for communication with the next component down the TSS stack. In most configurations this will be the TPM but it could be a simulator or proxy. Supported TCTIs are or “device” or “socket” .

-d, --device-file

Specify the TPM device file for use by the device TCTI. The default is /dev/tpm0.

-R, --socket-address

Specify the domain name or IP address used by the socket TCTI. The default is 127.0.0.1.

-p, --socket-port

Specify the port number used by the socket TCTI. The default is 2321.

ENVIRONMENT: TCTI

This collection of environment variables that may be used to configure the varous TCTI modules available. The values passed through these variables can be overridden on a per-command basis using the available command line options.

TPM2TOOLS_TCTI_NAME

Select the TCTI used for communication with the next component down the TSS stack. In most configurations this will be the TPM but it could be a simulator or proxy. See 'OPTIONS' section for the names of supported TCTIs.

TPM2TOOLS_DEVICE_FILE

Specify the TPM device file for use by the device TCTI.

TPM2TOOLS_SOCKET_ADDRESS

Specify the domain name or IP address used by the socket TCTI.

TPM2TOOLS_SOCKET_PORT

Specify the port number used by the socket TCTI.

EXAMPLES¶

tpm2_hmac

tpm2_hmac  -k 0x81010002 -P abc123 -g 0x004 -I <inputFilename> -o <hmacFilename>
tpm2_hmac  -c key.context -P abc123 -g 0x004 -I <inputFilename> -o <hmacFilename>
tpm2_hmac  -k 0x81010002 -P 123abc -X -g 0x004 -I <inputFilename> -o <hmacFilename>