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 "PolicyNameHash_fp.h"
37
38 #if CC_PolicyNameHash // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // Add a nameHash restriction to the policyDigest
42 */
43 // Return Type: TPM_RC
44 // TPM_RC_CPHASH 'nameHash' has been previously set to a different value
45 // TPM_RC_SIZE 'nameHash' is not the size of the digest produced by the
46 // hash algorithm associated with 'policySession'
47 TPM_RC
TPM2_PolicyNameHash(PolicyNameHash_In * in)48 TPM2_PolicyNameHash(
49 PolicyNameHash_In *in // IN: input parameter list
50 )
51 {
52 SESSION *session;
53 TPM_CC commandCode = TPM_CC_PolicyNameHash;
54 HASH_STATE hashState;
55
56 // Input Validation
57
58 // Get pointer to the session structure
59 session = SessionGet(in->policySession);
60
61 // A valid nameHash must have the same size as session hash digest
62 // Since the authHashAlg for a session cannot be TPM_ALG_NULL, the digest size
63 // is always non-zero.
64 if(in->nameHash.t.size != CryptHashGetDigestSize(session->authHashAlg))
65 return TPM_RCS_SIZE + RC_PolicyNameHash_nameHash;
66
67 // u1 in the policy session context cannot otherwise be occupied
68 if(session->u1.cpHash.b.size != 0
69 || session->attributes.isBound
70 || session->attributes.isCpHashDefined
71 || session->attributes.isTemplateSet)
72 return TPM_RC_CPHASH;
73
74 // Internal Data Update
75
76 // Update policy hash
77 // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyNameHash || nameHash)
78 // Start hash
79 CryptHashStart(&hashState, session->authHashAlg);
80
81 // add old digest
82 CryptDigestUpdate2B(&hashState, &session->u2.policyDigest.b);
83
84 // add commandCode
85 CryptDigestUpdateInt(&hashState, sizeof(TPM_CC), commandCode);
86
87 // add nameHash
88 CryptDigestUpdate2B(&hashState, &in->nameHash.b);
89
90 // complete the digest
91 CryptHashEnd2B(&hashState, &session->u2.policyDigest.b);
92
93 // update nameHash in session context
94 session->u1.cpHash = in->nameHash;
95
96 return TPM_RC_SUCCESS;
97 }
98
99 #endif // CC_PolicyNameHash