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 "PolicyCommandCode_fp.h"
37
38 #if CC_PolicyCommandCode // Conditional expansion of this file
39
40 /*(See part 3 specification)
41 // Add a Command Code restriction to the policyDigest
42 */
43 // Return Type: TPM_RC
44 // TPM_RC_VALUE 'commandCode' of 'policySession' previously set to
45 // a different value
46
47 TPM_RC
TPM2_PolicyCommandCode(PolicyCommandCode_In * in)48 TPM2_PolicyCommandCode(
49 PolicyCommandCode_In *in // IN: input parameter list
50 )
51 {
52 SESSION *session;
53 TPM_CC commandCode = TPM_CC_PolicyCommandCode;
54 HASH_STATE hashState;
55
56 // Input validation
57
58 // Get pointer to the session structure
59 session = SessionGet(in->policySession);
60
61 if(session->commandCode != 0 && session->commandCode != in->code)
62 return TPM_RCS_VALUE + RC_PolicyCommandCode_code;
63 if(CommandCodeToCommandIndex(in->code) == UNIMPLEMENTED_COMMAND_INDEX)
64 return TPM_RCS_POLICY_CC + RC_PolicyCommandCode_code;
65
66 // Internal Data Update
67 // Update policy hash
68 // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyCommandCode || code)
69 // Start hash
70 CryptHashStart(&hashState, session->authHashAlg);
71
72 // add old digest
73 CryptDigestUpdate2B(&hashState, &session->u2.policyDigest.b);
74
75 // add commandCode
76 CryptDigestUpdateInt(&hashState, sizeof(TPM_CC), commandCode);
77
78 // add input commandCode
79 CryptDigestUpdateInt(&hashState, sizeof(TPM_CC), in->code);
80
81 // complete the hash and get the results
82 CryptHashEnd2B(&hashState, &session->u2.policyDigest.b);
83
84 // update commandCode value in session context
85 session->commandCode = in->code;
86
87 return TPM_RC_SUCCESS;
88 }
89
90 #endif // CC_PolicyCommandCode