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 "PolicyAuthValue_fp.h"
37
38 #if CC_PolicyAuthValue // Conditional expansion of this file
39
40 #include "Policy_spt_fp.h"
41
42 /*(See part 3 specification)
43 // allows a policy to be bound to the authorization value of the authorized
44 // object
45 */
46 TPM_RC
TPM2_PolicyAuthValue(PolicyAuthValue_In * in)47 TPM2_PolicyAuthValue(
48 PolicyAuthValue_In *in // IN: input parameter list
49 )
50 {
51 SESSION *session;
52 TPM_CC commandCode = TPM_CC_PolicyAuthValue;
53 HASH_STATE hashState;
54
55 // Internal Data Update
56
57 // Get pointer to the session structure
58 session = SessionGet(in->policySession);
59
60 // Update policy hash
61 // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyAuthValue)
62 // Start hash
63 CryptHashStart(&hashState, session->authHashAlg);
64
65 // add old digest
66 CryptDigestUpdate2B(&hashState, &session->u2.policyDigest.b);
67
68 // add commandCode
69 CryptDigestUpdateInt(&hashState, sizeof(TPM_CC), commandCode);
70
71 // complete the hash and get the results
72 CryptHashEnd2B(&hashState, &session->u2.policyDigest.b);
73
74 // update isAuthValueNeeded bit in the session context
75 session->attributes.isAuthValueNeeded = SET;
76 session->attributes.isPasswordNeeded = CLEAR;
77
78 return TPM_RC_SUCCESS;
79 }
80
81 #endif // CC_PolicyAuthValue