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
36 //
37 // Platform Endorsement Primary Seed
38 //
39
40 #include "TpmError.h"
41 #include "Admin.h"
42
43 #include <tee_internal_api.h>
44 #include <tee_internal_api_extensions.h>
45
46 #define TEE_EPS_SIZE (256/2) // From TPM2B_RSA_TEST_PRIME in Hierarchy.c
47
48 void
_plat__GetEPS(UINT16 Size,uint8_t * EndorsementSeed)49 _plat__GetEPS(UINT16 Size, uint8_t *EndorsementSeed)
50 {
51 TEE_Result Result = TEE_ERROR_ITEM_NOT_FOUND;
52 uint8_t EPS[TEE_EPS_SIZE] = { 0 };
53 size_t EPSLen;
54
55 IMSG("Size=%" PRIu16 "",Size);
56 IMSG("EPS=%d",TEE_EPS_SIZE);
57
58 pAssert(Size <= (TEE_EPS_SIZE));
59
60 Result = TEE_GetPropertyAsBinaryBlock(TEE_PROPSET_CURRENT_TA,
61 "com.microsoft.ta.endorsementSeed",
62 EPS,
63 &EPSLen);
64
65 if ((EPSLen < Size) || (Result != TEE_SUCCESS)) {
66 // We failed to access the property. We can't continue without it
67 // and we can't just fail to manufacture, so randomize EPS and
68 // continue. If necessary, fTPM TA storage can be cleared, or the
69 // TA updated, and we can trigger remanufacture and try again.
70 _plat__GetEntropy(EndorsementSeed, TEE_EPS_SIZE);
71 return;
72 }
73
74 memcpy(EndorsementSeed, EPS, Size);
75
76 #ifdef fTPMDebug
77 {
78 uint32_t x;
79 uint8_t *seed = EndorsementSeed;
80 DMSG("TEE_GetProperty 0x%x, seedLen 0x%x\n", Result, Size);
81 for (x = 0; x < Size; x = x + 8) {
82 DMSG(" seed(%2.2d): %2.2x,%2.2x,%2.2x,%2.2x,%2.2x,%2.2x,%2.2x,%2.2x\n", x,
83 seed[x + 0], seed[x + 1], seed[x + 2], seed[x + 3],
84 seed[x + 4], seed[x + 5], seed[x + 6], seed[x + 7]);
85 }
86 }
87 #endif
88
89 return;
90 }
91