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
TPM2_ChangeEPS(ChangeEPS_In * in)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