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 "ChangeEPS_fp.h" 10 TPM_RC 11 TPM2_ChangeEPS( 12 ChangeEPS_In *in // IN: input parameter list 13 ) 14 { 15 TPM_RC result; 16 17 // The command needs NV update. Check if NV is available. 18 // A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned at 19 // this point 20 result = NvIsAvailable(); 21 if(result != TPM_RC_SUCCESS) return result; 22 23 // Input parameter is not reference in command action 24 in = NULL; 25 26 // Internal Data Update 27 28 // Reset endorsement hierarchy seed from RNG 29 CryptGenerateRandom(PRIMARY_SEED_SIZE, gp.EPSeed.t.buffer); 30 31 // Create new ehProof value from RNG 32 CryptGenerateRandom(PROOF_SIZE, gp.ehProof.t.buffer); 33 34 // Enable endorsement hierarchy 35 gc.ehEnable = TRUE; 36 37 // set authValue buffer to zeros 38 MemorySet(gp.endorsementAuth.t.buffer, 0, gp.endorsementAuth.t.size); 39 // Set endorsement authValue to null 40 gp.endorsementAuth.t.size = 0; 41 42 // Set endorsement authPolicy to null 43 gp.endorsementAlg = TPM_ALG_NULL; 44 gp.endorsementPolicy.t.size = 0; 45 46 // Flush loaded object in endorsement hierarchy 47 ObjectFlushHierarchy(TPM_RH_ENDORSEMENT); 48 49 // Flush evict object of endorsement hierarchy stored in NV 50 NvFlushHierarchy(TPM_RH_ENDORSEMENT); 51 52 // Save hierarchy changes to NV 53 NvWriteReserved(NV_EP_SEED, &gp.EPSeed); 54 NvWriteReserved(NV_EH_PROOF, &gp.ehProof); 55 NvWriteReserved(NV_ENDORSEMENT_AUTH, &gp.endorsementAuth); 56 NvWriteReserved(NV_ENDORSEMENT_ALG, &gp.endorsementAlg); 57 NvWriteReserved(NV_ENDORSEMENT_POLICY, &gp.endorsementPolicy); 58 59 // orderly state should be cleared because of the update to state clear data 60 g_clearOrderly = TRUE; 61 62 return TPM_RC_SUCCESS; 63 } 64
