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.\"
.IX Title "TPMLIB_ValidateState 3"
.TH TPMLIB_ValidateState 3 "2023-05-21" "libtpms" ""
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
TPMLIB_ValidateState  \- Validate the state blobs of the TPM
.SH "LIBRARY"
.IX Header "LIBRARY"
\&\s-1TPM\s0 library (libtpms, \-ltpms)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
\&\fB#include <libtpms/tpm_library.h\fR>
.PP
\&\fBuint32_t TPMLIB_ValidateState(TPMLIB_StateType st,
                              unsigned int flags);
\&\fR
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fB\fBTPMLIB_ValidateState()\fB\fR function allows to validate the
state blobs that the \s-1TPM\s0 would read upon \fB\fBTPMLIB_MainInit()\fB\fR or
once the TPM_Startup command has been sent to it.
.PP
This function is useful for \s-1TPM\s0 state migration between possibly
different version of libtpms. Here the target libtpms needs to be
able to determine whether it can support the version of blobs that were
migrated and if this is not the case, the caller can refuse the
migration.
.PP
The \fBtpmlib_state\fR parameter can be a logical 'or' of one or
multiple of of the following: \fB\s-1TPMLIB_STATE_PERMANENT\s0\fR,
\&\fB\s-1TPMLIB_STATE_VOLATILE\s0\fR, or \fB\s-1TPMLIB_STATE_SAVE_STATE\s0\fR.
The \fBflags\fR parameter is currently not used and should be set to 0.
.PP
The first state blob that should be loaded is the permanent state,
since for example the volatile state requires it to be available
for validation.
.PP
This function should be called before \fB\fBTPMLIB_MainInit()\fB\fR is invoked.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBTPMLIB_MainInit\fR(3), \fBTPMLIB_Terminate\fR(3)