1// This file was extracted from the TCG Published
2// Trusted Platform Module Library
3// Part 3: Commands
4// Family "2.0"
5// Level 00 Revision 01.16
6// October 30, 2014
7
8#include "InternalRoutines.h"
9#include "PCR_Extend_fp.h"
10//
11//
12//     Error Returns                     Meaning
13//
14//     TPM_RC_LOCALITY                   current command locality is not allowed to extend the PCR
15//                                       referenced by pcrHandle
16//
17TPM_RC
18TPM2_PCR_Extend(
19   PCR_Extend_In     *in                 // IN: input parameter list
20   )
21{
22   TPM_RC                  result;
23   UINT32                  i;
24
25// Input Validation
26
27   //   NOTE: This function assumes that the unmarshaling function for 'digests' will
28   //   have validated that all of the indicated hash algorithms are valid. If the
29   //   hash algorithms are correct, the unmarshaling code will unmarshal a digest
30   //   of the size indicated by the hash algorithm. If the overall size is not
31   //   consistent, the unmarshaling code will run out of input data or have input
32   //   data left over. In either case, it will cause an unmarshaling error and this
33   //   function will not be called.
34
35   // For NULL handle, do nothing and return success
36   if(in->pcrHandle == TPM_RH_NULL)
37       return TPM_RC_SUCCESS;
38
39   // Check if the extend operation is allowed by the current command locality
40   if(!PCRIsExtendAllowed(in->pcrHandle))
41       return TPM_RC_LOCALITY;
42
43   // If PCR is state saved and we need to update orderlyState, check NV
44   // availability
45   if(PCRIsStateSaved(in->pcrHandle) && gp.orderlyState != SHUTDOWN_NONE)
46   {
47       result = NvIsAvailable();
48       if(result != TPM_RC_SUCCESS) return result;
49       g_clearOrderly = TRUE;
50   }
51
52// Internal Data Update
53
54   // Iterate input digest list to extend
55   for(i = 0; i < in->digests.count; i++)
56   {
57       PCRExtend(in->pcrHandle, in->digests.digests[i].hashAlg,
58                 CryptGetHashDigestSize(in->digests.digests[i].hashAlg),
59                 (BYTE *) &in->digests.digests[i].digest);
60   }
61
62   return TPM_RC_SUCCESS;
63}
64