| // 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 "ChangePPS_fp.h" |
| TPM_RC |
| TPM2_ChangePPS( |
| ChangePPS_In *in // IN: input parameter list |
| ) |
| { |
| UINT32 i; |
| TPM_RC result; |
| |
| // Check if NV is available. A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE |
| // error may be returned at this point |
| result = NvIsAvailable(); |
| if(result != TPM_RC_SUCCESS) return result; |
| |
| // Input parameter is not reference in command action |
| in = NULL; |
| |
| // Internal Data Update |
| |
| // Reset platform hierarchy seed from RNG |
| CryptGenerateRandom(PRIMARY_SEED_SIZE, gp.PPSeed.t.buffer); |
| |
| // Create a new phProof value from RNG to prevent the saved platform |
| // hierarchy contexts being loaded |
| CryptGenerateRandom(PROOF_SIZE, gp.phProof.t.buffer); |
| |
| // Set platform authPolicy to null |
| gc.platformAlg = TPM_ALG_NULL; |
| gc.platformPolicy.t.size = 0; |
| |
| // Flush loaded object in platform hierarchy |
| ObjectFlushHierarchy(TPM_RH_PLATFORM); |
| |
| // Flush platform evict object and index in NV |
| NvFlushHierarchy(TPM_RH_PLATFORM); |
| |
| // Save hierarchy changes to NV |
| NvWriteReserved(NV_PP_SEED, &gp.PPSeed); |
| NvWriteReserved(NV_PH_PROOF, &gp.phProof); |
| |
| // Re-initialize PCR policies |
| for(i = 0; i < NUM_POLICY_PCR_GROUP; i++) |
| { |
| gp.pcrPolicies.hashAlg[i] = TPM_ALG_NULL; |
| gp.pcrPolicies.policy[i].t.size = 0; |
| } |
| NvWriteReserved(NV_PCR_POLICIES, &gp.pcrPolicies); |
| |
| // orderly state should be cleared because of the update to state clear data |
| g_clearOrderly = TRUE; |
| |
| return TPM_RC_SUCCESS; |
| } |