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
37 // This function is called to process a _TPM_Hash_End indication.
38 LIB_EXPORT void
_TPM_Hash_End(void)39 _TPM_Hash_End(
40 void
41 )
42 {
43 UINT32 i;
44 TPM2B_DIGEST digest;
45 HASH_OBJECT *hashObject;
46 TPMI_DH_PCR pcrHandle;
47
48 // If the DRTM handle is not being used, then either _TPM_Hash_Start has not
49 // been called, _TPM_Hash_End was previously called, or some other command
50 // was executed and the sequence was aborted.
51 if(g_DRTMHandle == TPM_RH_UNASSIGNED)
52 return;
53
54 // Get DRTM sequence object
55 hashObject = (HASH_OBJECT *)HandleToObject(g_DRTMHandle);
56
57 // Is this _TPM_Hash_End after Startup or before
58 if(TPMIsStarted())
59 {
60 // After
61
62 // Reset the DRTM PCR
63 PCRResetDynamics();
64
65 // Extend the DRTM_PCR.
66 pcrHandle = PCR_FIRST + DRTM_PCR;
67
68 // DRTM sequence increments restartCount
69 gr.restartCount++;
70 }
71 else
72 {
73 pcrHandle = PCR_FIRST + HCRTM_PCR;
74 g_DrtmPreStartup = TRUE;
75 }
76
77 // Complete hash and extend PCR, or if this is an HCRTM, complete
78 // the hash, reset the H-CRTM register (PCR[0]) to 0...04, and then
79 // extend the H-CRTM data
80 for(i = 0; i < HASH_COUNT; i++)
81 {
82 TPMI_ALG_HASH hash = CryptHashGetAlgByIndex(i);
83 // make sure that the PCR is implemented for this algorithm
84 if(PcrIsAllocated(pcrHandle,
85 hashObject->state.hashState[i].hashAlg))
86 {
87 // Complete hash
88 digest.t.size = CryptHashGetDigestSize(hash);
89 CryptHashEnd2B(&hashObject->state.hashState[i], &digest.b);
90
91 PcrDrtm(pcrHandle, hash, &digest);
92 }
93 }
94
95 // Flush sequence object.
96 FlushObject(g_DRTMHandle);
97
98 g_DRTMHandle = TPM_RH_UNASSIGNED;
99
100
101 return;
102 }