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 //** Introduction
36 //
37 // The functions in this file are used for initialization of the interface to the
38 // OpenSSL library.
39
40 //** Defines and Includes
41
42 #include "Tpm.h"
43
44 #if defined(HASH_LIB_OSSL) || defined(MATH_LIB_OSSL) || defined(SYM_LIB_OSSL)
45 // Used to pass the pointers to the correct sub-keys
46 typedef const BYTE *desKeyPointers[3];
47
48 //*** SupportLibInit()
49 // This does any initialization required by the support library.
50 LIB_EXPORT int
SupportLibInit(void)51 SupportLibInit(
52 void
53 )
54 {
55 return TRUE;
56 }
57
58 //*** OsslContextEnter()
59 // This function is used to initialize an OpenSSL context at the start of a function
60 // that will call to an OpenSSL math function.
61 BN_CTX *
OsslContextEnter(void)62 OsslContextEnter(
63 void
64 )
65 {
66 BN_CTX *CTX = BN_CTX_new();
67 //
68 return OsslPushContext(CTX);
69 }
70
71 //*** OsslContextLeave()
72 // This is the companion function to OsslContextEnter().
73 void
OsslContextLeave(BN_CTX * CTX)74 OsslContextLeave(
75 BN_CTX *CTX
76 )
77 {
78 OsslPopContext(CTX);
79 BN_CTX_free(CTX);
80 }
81
82 //*** OsslPushContext()
83 // This function is used to create a frame in a context. All values allocated within
84 // this context after the frame is started will be automatically freed when the
85 // context (OsslPopContext()
86 BN_CTX *
OsslPushContext(BN_CTX * CTX)87 OsslPushContext(
88 BN_CTX *CTX
89 )
90 {
91 if(CTX == NULL)
92 FAIL(FATAL_ERROR_ALLOCATION);
93 BN_CTX_start(CTX);
94 return CTX;
95 }
96
97 //*** OsslPopContext()
98 // This is the companion function to OsslPushContext().
99 void
OsslPopContext(BN_CTX * CTX)100 OsslPopContext(
101 BN_CTX *CTX
102 )
103 {
104 // BN_CTX_end can't be called with NULL. It will blow up.
105 if(CTX != NULL)
106 BN_CTX_end(CTX);
107 }
108
109 #endif // HASH_LIB_OSSL || MATH_LIB_OSSL || SYM_LIB_OSSL
110