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// This file was extracted from the TCG Published
// Trusted Platform Module Library
// Part 4: Supporting Routines
// Family "2.0"
// Level 00 Revision 01.16
// October 30, 2014
#include "Tpm.h"
#include "InternalRoutines.h"
//
//
// Functions
//
// HandleGetType()
//
// This function returns the type of a handle which is the MSO of the handle.
//
TPM_HT
HandleGetType(
TPM_HANDLE handle // IN: a handle to be checked
)
{
// return the upper bytes of input data
return (TPM_HT) ((handle & HR_RANGE_MASK) >> HR_SHIFT);
}
//
//
// NextPermanentHandle()
//
// This function returns the permanent handle that is equal to the input value or is the next higher value. If
// there is no handle with the input value and there is no next higher value, it returns 0:
//
// Return Value Meaning
//
TPM_HANDLE
NextPermanentHandle(
TPM_HANDLE inHandle // IN: the handle to check
)
{
// If inHandle is below the start of the range of permanent handles
// set it to the start and scan from there
if(inHandle < TPM_RH_FIRST)
inHandle = TPM_RH_FIRST;
// scan from input value untill we find an implemented permanent handle
// or go out of range
for(; inHandle <= TPM_RH_LAST; inHandle++)
{
switch (inHandle)
{
case TPM_RH_OWNER:
case TPM_RH_NULL:
case TPM_RS_PW:
case TPM_RH_LOCKOUT:
case TPM_RH_ENDORSEMENT:
case TPM_RH_PLATFORM:
case TPM_RH_PLATFORM_NV:
#ifdef VENDOR_PERMANENT
case VENDOR_PERMANENT:
#endif
return inHandle;
break;
default:
break;
}
}
// Out of range on the top
return 0;
}
//
//
// PermanentCapGetHandles()
//
// This function returns a list of the permanent handles of PCR, started from handle. If handle is larger than
// the largest permanent handle, an empty list will be returned with more set to NO.
//
// Return Value Meaning
//
// YES if there are more handles available
// NO all the available handles has been returned
//
TPMI_YES_NO
PermanentCapGetHandles(
TPM_HANDLE handle, // IN: start handle
UINT32 count, // IN: count of returned handle
TPML_HANDLE *handleList // OUT: list of handle
)
{
TPMI_YES_NO more = NO;
UINT32 i;
pAssert(HandleGetType(handle) == TPM_HT_PERMANENT);
// Initialize output handle list
handleList->count = 0;
// The maximum count of handles we may return is MAX_CAP_HANDLES
if(count > MAX_CAP_HANDLES) count = MAX_CAP_HANDLES;
// Iterate permanent handle range
for(i = NextPermanentHandle(handle);
i != 0; i = NextPermanentHandle(i+1))
{
if(handleList->count < count)
{
// If we have not filled up the return list, add this permanent
// handle to it
handleList->handle[handleList->count] = i;
handleList->count++;
}
else
{
// If the return list is full but we still have permanent handle
// available, report this and stop iterating
more = YES;
break;
}
}
return more;
}
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