// This file was extracted from the TCG Published

// Trusted Platform Module Library

// Part 3: Commands

// Family "2.0"

// Level 00 Revision 01.16

// October 30, 2014

#include "InternalRoutines.h"

#include "PCR_Extend_fp.h"

//

//

//     Error Returns                     Meaning

//

//     TPM_RC_LOCALITY                   current command locality is not allowed to extend the PCR

//                                       referenced by pcrHandle

//

TPM_RC

TPM2_PCR_Extend(

   PCR_Extend_In     *in                 // IN: input parameter list

   )

{

   TPM_RC                  result;

   UINT32                  i;

// Input Validation

   //   NOTE: This function assumes that the unmarshaling function for 'digests' will

   //   have validated that all of the indicated hash algorithms are valid. If the

   //   hash algorithms are correct, the unmarshaling code will unmarshal a digest

   //   of the size indicated by the hash algorithm. If the overall size is not

   //   consistent, the unmarshaling code will run out of input data or have input

   //   data left over. In either case, it will cause an unmarshaling error and this

   //   function will not be called.

   // For NULL handle, do nothing and return success

   if(in->pcrHandle == TPM_RH_NULL)

       return TPM_RC_SUCCESS;

   // Check if the extend operation is allowed by the current command locality

   if(!PCRIsExtendAllowed(in->pcrHandle))

       return TPM_RC_LOCALITY;

   // If PCR is state saved and we need to update orderlyState, check NV

   // availability

   if(PCRIsStateSaved(in->pcrHandle) && gp.orderlyState != SHUTDOWN_NONE)

   {

       result = NvIsAvailable();

       if(result != TPM_RC_SUCCESS) return result;

       g_clearOrderly = TRUE;

   }

// Internal Data Update

   // Iterate input digest list to extend

   for(i = 0; i < in->digests.count; i++)

   {

       PCRExtend(in->pcrHandle, in->digests.digests[i].hashAlg,

                 CryptGetHashDigestSize(in->digests.digests[i].hashAlg),

                 (BYTE *) &in->digests.digests[i].digest);

   }

   return TPM_RC_SUCCESS;

}