1 /* Microsoft Reference Implementation for TPM 2.0
2 *
3 * The copyright in this software is being made available under the BSD License,
4 * included below. This software may be subject to other third party and
5 * contributor rights, including patent rights, and no such rights are granted
6 * under this license.
7 *
8 * Copyright (c) Microsoft Corporation
9 *
10 * All rights reserved.
11 *
12 * BSD License
13 *
14 * Redistribution and use in source and binary forms, with or without modification,
15 * are permitted provided that the following conditions are met:
16 *
17 * Redistributions of source code must retain the above copyright notice, this list
18 * of conditions and the following disclaimer.
19 *
20 * Redistributions in binary form must reproduce the above copyright notice, this
21 * list of conditions and the following disclaimer in the documentation and/or
22 * other materials provided with the distribution.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
27 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
28 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
31 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 #include "Tpm.h"
36 #include "ChangePPS_fp.h"
37
38 #if CC_ChangePPS // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // Reset current PPS value
42 */
43 TPM_RC
TPM2_ChangePPS(ChangePPS_In * in)44 TPM2_ChangePPS(
45 ChangePPS_In *in // IN: input parameter list
46 )
47 {
48 UINT32 i;
49
50 // Check if NV is available. A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE
51 // error may be returned at this point
52 RETURN_IF_NV_IS_NOT_AVAILABLE;
53
54 // Input parameter is not reference in command action
55 NOT_REFERENCED(in);
56
57 // Internal Data Update
58
59 // Reset platform hierarchy seed from RNG
60 CryptRandomGenerate(sizeof(gp.PPSeed.t.buffer), gp.PPSeed.t.buffer);
61
62 // Create a new phProof value from RNG to prevent the saved platform
63 // hierarchy contexts being loaded
64 CryptRandomGenerate(sizeof(gp.phProof.t.buffer), gp.phProof.t.buffer);
65
66 // Set platform authPolicy to null
67 gc.platformAlg = TPM_ALG_NULL;
68 gc.platformPolicy.t.size = 0;
69
70 // Flush loaded object in platform hierarchy
71 ObjectFlushHierarchy(TPM_RH_PLATFORM);
72
73 // Flush platform evict object and index in NV
74 NvFlushHierarchy(TPM_RH_PLATFORM);
75
76 // Save hierarchy changes to NV
77 NV_SYNC_PERSISTENT(PPSeed);
78 NV_SYNC_PERSISTENT(phProof);
79
80 // Re-initialize PCR policies
81 #if defined NUM_POLICY_PCR_GROUP && NUM_POLICY_PCR_GROUP > 0
82 for(i = 0; i < NUM_POLICY_PCR_GROUP; i++)
83 {
84 gp.pcrPolicies.hashAlg[i] = TPM_ALG_NULL;
85 gp.pcrPolicies.policy[i].t.size = 0;
86 }
87 NV_SYNC_PERSISTENT(pcrPolicies);
88 #endif
89
90 // orderly state should be cleared because of the update to state clear data
91 g_clearOrderly = TRUE;
92
93 return TPM_RC_SUCCESS;
94 }
95
96 #endif // CC_ChangePPS