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https://github.com/stefanberger/libtpms
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7071a43bab
Clear all the cached states blobs set using TPMLIB_SetState if one of them cannot be accepted. Signed-off-by: Stfean Berger <stefanb@linux.vnet.ibm.com>
55 lines
2.2 KiB
Plaintext
55 lines
2.2 KiB
Plaintext
=head1 NAME
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TPMLIB_SetState - Set the TPM's volatile, permanent, or save state
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TPMLIB_GetState - Get the TPM's volatile, permanent, or save state
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=head1 LIBRARY
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TPM library (libtpms, -ltpms)
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=head1 SYNOPSIS
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B<#include <libtpms/tpm_library.h>>
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B<TPM_RESULT TPMLIB_SetState(enum TPMLIB_StateType st,
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const unsigned char *buffer, uint32_t buflen);>
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B<TPM_RESULT TPMLIB_GetState(enum TPMLIB_StateType st,
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unsigned char **buffer, uint32_t *buflen);>
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=head1 DESCRIPTION
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The B<TPMLIB_SetState()> function allows to set either one of the state blobs of
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the TPM. The passed state blob is tested for whether it can be accepted and a TPM
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error code is returned in case it cannot be accepted. In case of acceptance, the
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state blob will be passed to the TPM upon B<TPM_MainInit()>. Setting a state blob
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hides a file that may contain the same type of blob and would be read otherwise.
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It is required to call this function with a NULL pointer for the buffer parameter
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to hide a state blob in a file.
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It is only possible to set the state blobs after B<TPMLIB_ChooseTPMVersion()>
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has been called. All state blobs are cleared when a different version of TPM is
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chosen using B<TPMLIB_ChooseTPMVersion> or when a call to B<TPMLIB_SetState()>
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fails because a state blob could not be accepted.
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The order in which state blobs are set is important. The first state blob has
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to be the one representing the TPM's permanent state. Only after that either
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the volatile or save state blobs can be set.
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The B<TPMLIB_GetState()> function allows to get the current state of the TPM.
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For as long as the TPM has not been started, this function either returns the state
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blob previously set with B<TPMLIB_SetState()> or the state is read from a file.
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Once the TPM has been start the state of the running TPM is returned.
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The B<TPMLIB_STATE_SAVE_STATE> (save state) type of TPM state can be set with this
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function. The same state blob will be returned until TPM_Startup(ST_STATE) has been
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called, after which an empty blob will be returned. This blob can also only be
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read after TPM_SaveState() has been sent to the TPM.
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=head1 SEE ALSO
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B<TPMLIB_ChooseTPMVersion>(3), B<TPMLIB_MainInit>(3), B<TPMLIB_Terminate>(3)
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=cut
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