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tpm2_hmac - performs an HMAC on the supplied data using the indicated

tpm2_hmac(8) tpm2.0-tools tpm2_hmac(8)

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>

DECEMBER 2016 Intel