TPMCmd/tpm/src/crypt/ossl/TpmToOsslSupport.c

/* Microsoft Reference Implementation for TPM 2.0
 *
 *  The copyright in this software is being made available under the BSD License,
 *  included below. This software may be subject to other third party and
 *  contributor rights, including patent rights, and no such rights are granted
 *  under this license.
 *
 *  Copyright (c) Microsoft Corporation
 *
 *  All rights reserved.
 *
 *  BSD License
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this list
 *  of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above copyright notice, this
 *  list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
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 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */
//** Introduction
//
// The functions in this file are used for initialization of the interface to the
// OpenSSL library.

//** Defines and Includes

#include "Tpm.h"

#if defined(HASH_LIB_OSSL) || defined(MATH_LIB_OSSL) || defined(SYM_LIB_OSSL)
// Used to pass the pointers to the correct sub-keys
typedef const BYTE *desKeyPointers[3];

//*** SupportLibInit()
// This does any initialization required by the support library.
LIB_EXPORT int
SupportLibInit(
    void
    )
{
    return TRUE;
}

//*** OsslContextEnter()
// This function is used to initialize an OpenSSL context at the start of a function
// that will call to an OpenSSL math function.
BN_CTX *
OsslContextEnter(
    void
    )
{
    BN_CTX              *CTX = BN_CTX_new();
//
    return OsslPushContext(CTX);
}

//*** OsslContextLeave()
// This is the companion function to OsslContextEnter().
void
OsslContextLeave(
    BN_CTX          *CTX
    )
{
    OsslPopContext(CTX);
    BN_CTX_free(CTX);
}

//*** OsslPushContext()
// This function is used to create a frame in a context. All values allocated within
// this context after the frame is started will be automatically freed when the
// context (OsslPopContext()
BN_CTX *
OsslPushContext(
    BN_CTX          *CTX
    )
{
    if(CTX == NULL)
        FAIL(FATAL_ERROR_ALLOCATION);
    BN_CTX_start(CTX);
    return CTX;
}

//*** OsslPopContext()
// This is the companion function to OsslPushContext().
void
OsslPopContext(
    BN_CTX          *CTX
    )
{
    // BN_CTX_end can't be called with NULL. It will blow up.
    if(CTX != NULL)
        BN_CTX_end(CTX);
}

#endif // HASH_LIB_OSSL || MATH_LIB_OSSL || SYM_LIB_OSSL