NAME

       tpm2_nvrelease(1) - Release a Non-Volatile (NV) index.

SYNOPSIS

       tpm2_nvrelease [OPTIONS]

DESCRIPTION

       tpm2_nvrelease(1)  -  Release  a  Non-Volatile (NV) index that was previously defined with
       tpm2_nvdefine(1).

OPTIONS

       · -x, –index=NV_INDEX: Specifies the index to release.

       · -a, –auth-handle=SECRET_DATA_FILE: specifies the handle used to authorize:

         · 0x40000001 for TPM_RH_OWNER

         · 0x4000000C for TPM_RH_PLATFORM

       · -s, –size=SIZE: specifies the size of data area in bytes.

       · -P, –handle-passwd=HANDLE_PASSWORD: specifies the  password  of  authHandle.   Passwords
         should follow the “password formatting standards, see section”Password Formatting“.

       · -S,  –input-session-handle=SIZE: Optional Input session handle from a policy session for
         authorization.

COMMON OPTIONS

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

       · -h,  –help: Display the tools manpage.  This 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.  # TCTI ENVIRONMENT

       This collection of environment variables that may be used to configure  the  various  TCTI
       modules available.

       The  values  passed through these variables can be overridden on a per-command basis using
       the available command line options, see the TCTI_OPTIONS section.

       The variables respected depend on how the software was configured.

       · 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.  The current known TCTIs are:

         · tabrmd      -      The      new      resource       manager,       called       tabrmd
           (https://github.com/01org/tpm2-abrmd).

         · socket  -  Typically  used  with  the  old  resource manager, or talking directly to a
           simulator.

         · device - Used when talking directly to a TPM device file.

       · TPM2TOOLS_DEVICE_FILE: When using the device TCTI, specify the  TPM  device  file.   The
         default is “/dev/tpm0”.

         Note:  Using  the  tpm directly requires the users to ensure that concurrent access does
         not occur and that they manage the tpm resources.  These tasks are usually managed by  a
         resource  manager.   Linux  4.12  and  greater supports an in kernel resource manager at
         “/dev/tpmrm”, typically “/dev/tpmrm0”.

       · TPM2TOOLS_SOCKET_ADDRESS: When using the socket TCTI, specify  the  domain  name  or  IP
         address used.  The default is 127.0.0.1.

       · TPM2TOOLS_SOCKET_PORT:  When  using  the socket TCTI, specify the port number used.  The
         default is 2321.

TCTI OPTIONS

       This collection of options are used to configure the varous TCTI modules available.   They
       override any environment variables.

       · -T, –tcti=TCTI_NAME[:TCTI_OPTIONS]: Select the TCTI used for communication with the next
         component down the TSS stack.  In most configurations this will be the resource manager:
         tabrmd  (https://github.com/01org/tpm2-abrmd)  Optionally,  tcti  specific  options  can
         appended to TCTI_NAME by appending a : to TCTI_NAME.

         · For the device TCTI, the TPM device file for use by the device TCTI can be  specified.
           The default is /dev/tpm0.  Example: -T device:/dev/tpm0

         · For  the socket TCTI, the domain name or IP address and port number used by the socket
           can  be   specified.    The   default   are   127.0.0.1   and   2321.    Example:   -T
           socket:127.0.0.1:2321

         · For the abrmd TCTI, it takes no options.  Example: -T abrmd

Password Formatting

       Passwords  are  interpreted in two forms, string and hex-string.  A string password is not
       interpreted, and is directly used for authorization.  A hex-string, is  converted  from  a
       hexidecimal form into a byte array form, thus allowing passwords with non-printable and/or
       terminal un-friendly characters.

       By default passwords are assumed to be in the string form.   Password  form  is  specified
       with special prefix values, they are:

       · str:  - Used to indicate it is a raw string.  Useful for escaping a password that starts
         with the “hex:” prefix.

       · hex: - Used when specifying a password in hex string format.

EXAMPLES

              tpm2_nvrelease -x 0x1500016 -a 0x40000001 -P passwd

RETURNS

       0 on success or 1 on failure.

BUGS

       Github Issues (https://github.com/01org/tpm2-tools/issues)

HELP

       See the Mailing List (https://lists.01.org/mailman/listinfo/tpm2)