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.\"
.IX Title "TPMLIB_SetState 3"
.TH TPMLIB_SetState 3 "2023-05-07" "libtpms" ""
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.SH "NAME"
TPMLIB_SetState  \- Set the TPM's volatile, permanent, or save state
.PP
TPMLIB_GetState  \- Get the TPM's volatile, permanent, or save state
.SH "LIBRARY"
.IX Header "LIBRARY"
\&\s-1TPM\s0 library (libtpms, \-ltpms)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fB#include <libtpms/tpm_library.h\fR>
.PP
\&\fB\s-1TPM_RESULT\s0 TPMLIB_SetState(enum TPMLIB_StateType st,
                           const unsigned char *buffer, uint32_t buflen);\fR
.PP
\&\fB\s-1TPM_RESULT\s0 TPMLIB_GetState(enum TPMLIB_StateType st,
                           unsigned char **buffer, uint32_t *buflen);\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\fBTPMLIB_SetState()\fB\fR function allows to set either one of the state blobs of
the \s-1TPM.\s0 The passed state blob is tested for whether it can be accepted and a \s-1TPM\s0
error code is returned in case it cannot be accepted. In case of acceptance, the
state blob will be passed to the \s-1TPM\s0 upon \fB\fBTPM_MainInit()\fB\fR. Setting a state blob
hides a file that may contain the same type of blob and would be read otherwise.
It is required to call this function with a \s-1NULL\s0 pointer for the buffer parameter
to hide a state blob in a file.
.PP
It is only possible to set the state blobs after \fB\fBTPMLIB_ChooseTPMVersion()\fB\fR
has been called. All state blobs are cleared when a different version of \s-1TPM\s0 is
chosen using \fBTPMLIB_ChooseTPMVersion\fR or when a call to \fB\fBTPMLIB_SetState()\fB\fR
fails because a state blob could not be accepted.
.PP
The order in which state blobs are set is important. The first state blob has
to be the one representing the \s-1TPM\s0's permanent state. Only after that either
the volatile or save state blobs can be set.
.PP
The \fB\fBTPMLIB_GetState()\fB\fR function allows to get the current state of the \s-1TPM.\s0
For as long as the \s-1TPM\s0 has not been started, this function either returns the state
blob previously set with \fB\fBTPMLIB_SetState()\fB\fR or the state is read from a file.
Once the \s-1TPM\s0 has been start the state of the running \s-1TPM\s0 is returned.
.PP
The \fB\s-1TPMLIB_STATE_SAVE_STATE\s0\fR (save state) type of \s-1TPM\s0 state can be set with this
function. The same state blob will be returned until TPM_Startup(\s-1ST_STATE\s0) has been
called, after which an empty blob will be returned. This blob can also only be
read after \fBTPM_SaveState()\fR has been sent to the \s-1TPM.\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBTPMLIB_ChooseTPMVersion\fR(3), \fBTPMLIB_MainInit\fR(3), \fBTPMLIB_Terminate\fR(3)