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 "PolicyNvWritten_fp.h"
37
38 #if CC_PolicyNvWritten // Conditional expansion of this file
39
40 // Make an NV Index policy dependent on the state of the TPMA_NV_WRITTEN
41 // attribute of the index.
42 // Return Type: TPM_RC
43 // TPM_RC_VALUE a conflicting request for the attribute has
44 // already been processed
45 TPM_RC
TPM2_PolicyNvWritten(PolicyNvWritten_In * in)46 TPM2_PolicyNvWritten(
47 PolicyNvWritten_In *in // IN: input parameter list
48 )
49 {
50 SESSION *session;
51 TPM_CC commandCode = TPM_CC_PolicyNvWritten;
52 HASH_STATE hashState;
53
54 // Input Validation
55
56 // Get pointer to the session structure
57 session = SessionGet(in->policySession);
58
59 // If already set is this a duplicate (the same setting)? If it
60 // is a conflicting setting, it is an error
61 if(session->attributes.checkNvWritten == SET)
62 {
63 if(((session->attributes.nvWrittenState == SET)
64 != (in->writtenSet == YES)))
65 return TPM_RCS_VALUE + RC_PolicyNvWritten_writtenSet;
66 }
67
68 // Internal Data Update
69
70 // Set session attributes so that the NV Index needs to be checked
71 session->attributes.checkNvWritten = SET;
72 session->attributes.nvWrittenState = (in->writtenSet == YES);
73
74 // Update policy hash
75 // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyNvWritten
76 // || writtenSet)
77 // Start hash
78 CryptHashStart(&hashState, session->authHashAlg);
79
80 // add old digest
81 CryptDigestUpdate2B(&hashState, &session->u2.policyDigest.b);
82
83 // add commandCode
84 CryptDigestUpdateInt(&hashState, sizeof(TPM_CC), commandCode);
85
86 // add the byte of writtenState
87 CryptDigestUpdateInt(&hashState, sizeof(TPMI_YES_NO), in->writtenSet);
88
89 // complete the digest
90 CryptHashEnd2B(&hashState, &session->u2.policyDigest.b);
91
92 return TPM_RC_SUCCESS;
93 }
94
95 #endif // CC_PolicyNvWritten