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Diffstat (limited to 'man/man3/TPMLIB_GetTPMProperty.pod')
-rw-r--r-- | man/man3/TPMLIB_GetTPMProperty.pod | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/man/man3/TPMLIB_GetTPMProperty.pod b/man/man3/TPMLIB_GetTPMProperty.pod new file mode 100644 index 0000000..ab3c918 --- /dev/null +++ b/man/man3/TPMLIB_GetTPMProperty.pod @@ -0,0 +1,153 @@ +=head1 NAME + +TPMLIB_GetTPMProperty - Get a runtime property of the TPM + +=head1 LIBRARY + +TPM library (libtpms, -ltpms) + +=head1 SYNOPSIS + +B<#include <libtpms/tpm_library.h>> + +B<TPM_RESULT TPMLIB_GetTPMProperty(enum TPMLIB_TPMProperty, int *result);> + +=head1 DESCRIPTION + +The B<TPMLIB_GetTPMProperty()> call is used to retrieve run-time parameters +of the TPM such as the number of authorization sessions it can hold or +the maximum sizes of the permanent state, savestate or volatile state blobs. + +This function can be called before or after the TPM has been created. +The current implementation of libtpms will return the same value before +and after the TPM was started. + +With the introduction of the function B<TPMLIB_ChooseTPMVersion()>, +the call to this function should be executed after the TPM version +has been chosen. The reason is that different TPM versions may return +different values. + +The following properties have been defined: + +=over 4 + +=item B<TPMPROP_TPM_RSA_KEY_LENGTH_MAX> + +The maximum size of an RSA key. + +=item B<TPMPROP_TPM_BUFFER_MAX> + +The maximum sizes of the TPM command and result buffers. + +=item B<TPMPROP_TPM_KEY_HANDLES> + +The number of key slots. + +=item B<TPMPROP_TPM_OWNER_EVICT_KEY_HANDLES> + +The number of owner-evict keys. + +=item B<TPMPROP_TPM_MIN_AUTH_SESSIONS> + +The number of authorization sessions. + +=item B<TPMPROP_TPM_MIN_TRANS_SESSIONS> + +The number of transport sessions. + +=item B<TPMPROP_TPM_MIN_DAA_SESSIONS> + +The number of DAA sessions. + +=item B<TPMPROP_TPM_MIN_SESSION_LIST> + +The size of the session list. + +=item B<TPMPROP_TPM_MIN_COUNTERS> + +The number of monotonic counters. + +=item B<TPMPROP_TPM_NUM_FAMILY_TABLE_ENTRY_MIN> + +The number of family entries. + +=item B<TPMPROP_TPM_NUM_DELEGATE_TABLE_ENTRY_MIN> + +The number of delegate entries. + +=item B<TPMPROP_TPM_SPACE_SAFETY_MARGIN> + +The space safety margin used for the worst-case sizes of the savestate and +volatile state blobs. This safety margin is not used for the size of the +permanent data blob. + +=item B<TPMPROP_TPM_MAX_NV_SPACE> + +The maximum size of the permanent data blob. + +=item B<TPMPROP_TPM_MAX_SAVESTATE_SPACE> + +The maximum size of the savestate blob (includes the space safety margin). + +=item B<TPMPROP_TPM_MAX_VOLATILESTATE_SPACE> + +The maximum size of the volatile state blob (includes the space saferty +margin). + +=back + +=head1 ERRORS + +=over 4 + +=item B<TPM_SUCCESS> + +The function completed successfully. + +=item B<TPM_FAIL> + +An undefined property was queried. + +=back + +For a complete list of TPM error codes please consult the include file +B<libtpms/tpm_error.h> + +=head1 EXAMPLE + + #include <stdio.h> + + #include <libtpms/tpm_library.h> + #include <libtpms/tpm_error.h> + + int main(void) { + TPM_RESULT res; + int result; + int rc = 0; + + if (TPMLIB_MainInit() != TPM_SUCCESS) { + fprintf(stderr, "Could not start the TPM.\n"); + return 1; + } + + if (TPMLIB_GetTPMProperty(TPMPROP_TPM_RSA_KEY_LENGTH_MAX, &result) + != TPM_SUCCESS) { + fprintf(stderr, "Could not read the max. size of RSA keys.\n"); + goto err_exit; + } + + fprintf(stdout, "Max. size of RSA keys: %d\n", result); + + err_exit: + TPMLIB_Terminate(); + + return 0; + } + +=head1 SEE ALSO + +B<TPMLIB_MainInit>(3), B<TPMLIB_Terminate>(3), +B<TPMLIB_Process>(3), B<TPMLIB_RegisterCallbacks>(3), B<TPMLIB_GetVersion>(3), +B<TPMLIB_ChooseTPMVersion>(3) + +=cut |