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 "ChangeEPS_fp.h"
37
38 #if CC_ChangeEPS // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // Reset current EPS value
42 */
43 TPM_RC
TPM2_ChangeEPS(ChangeEPS_In * in)44 TPM2_ChangeEPS(
45 ChangeEPS_In *in // IN: input parameter list
46 )
47 {
48 // The command needs NV update. Check if NV is available.
49 // A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned at
50 // this point
51 RETURN_IF_NV_IS_NOT_AVAILABLE;
52
53 // Input parameter is not reference in command action
54 NOT_REFERENCED(in);
55
56 // Internal Data Update
57
58 // Reset endorsement hierarchy seed from RNG
59 CryptRandomGenerate(sizeof(gp.EPSeed.t.buffer), gp.EPSeed.t.buffer);
60
61 // Create new ehProof value from RNG
62 CryptRandomGenerate(sizeof(gp.ehProof.t.buffer), gp.ehProof.t.buffer);
63
64 // Enable endorsement hierarchy
65 gc.ehEnable = TRUE;
66
67 // set authValue buffer to zeros
68 MemorySet(gp.endorsementAuth.t.buffer, 0, gp.endorsementAuth.t.size);
69 // Set endorsement authValue to null
70 gp.endorsementAuth.t.size = 0;
71
72 // Set endorsement authPolicy to null
73 gp.endorsementAlg = TPM_ALG_NULL;
74 gp.endorsementPolicy.t.size = 0;
75
76 // Flush loaded object in endorsement hierarchy
77 ObjectFlushHierarchy(TPM_RH_ENDORSEMENT);
78
79 // Flush evict object of endorsement hierarchy stored in NV
80 NvFlushHierarchy(TPM_RH_ENDORSEMENT);
81
82 // Save hierarchy changes to NV
83 NV_SYNC_PERSISTENT(EPSeed);
84 NV_SYNC_PERSISTENT(ehProof);
85 NV_SYNC_PERSISTENT(endorsementAuth);
86 NV_SYNC_PERSISTENT(endorsementAlg);
87 NV_SYNC_PERSISTENT(endorsementPolicy);
88
89 // orderly state should be cleared because of the update to state clear data
90 g_clearOrderly = TRUE;
91
92 return TPM_RC_SUCCESS;
93 }
94
95 #endif // CC_ChangeEPS